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第 1 条,共 223 条
标题: Generation of high-energy and broadband terahertz radiation via coherent synthesis 
作者: Li, SP (Li, Shaopeng); Liu, HJ (Liu, Hongjun); Huang, N (Huang, Nan); Sun, QB (Sun, Qibing)
来源出版物: JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS  卷: 46  期: 24  文献号: 245402  DOI: 10.1088/0953-4075/46/24/245402  出版年: DEC 28 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: A new method for the generation of high-energy and broadband terahertz (THz) radiation via coherent synthesis from multiple optical rectifications has been proposed. It is found that the intensities of the synthesized THz pulse are proportional to the square of the number of optical rectification processes when the same nonlinear crystals are used, which provides a simple method for the scaling up of THz energies with a powerful femtosecond laser. This method presents the possibility for THz strong-field physics with this table-top THz source. Moreover, in order to ensure that all the spectral components of the THz pulses are coherently synthesized, the relative time delay among the pump pulses should be less than 0.22 T-0 (T-0 is the pump pulse width).
文献类型: Article
KeyWords Plus: DIFFERENCE-FREQUENCY-GENERATION; 2ND-ORDER NONLINEAR MEDIUM; OPTICAL RECTIFICATION; PULSE SYNTHESIS; PHASE; LASER
Web of Science 类别: Optics; Physics, Atomic, Molecular & Chemical
研究方向: Optics; Physics
IDS 号: 269XA 
ISSN: 0953-4075 
电子 ISSN: 1361-6455 


第 2 条,共 223 条
标题: Face recognition using Weber local descriptors 
作者: Li, ST (Li, Shutao); Gong, DY (Gong, Dayi); Yuan, Y (Yuan, Yuan)
来源出版物: NEUROCOMPUTING  卷: 122  特刊: SI  页: 272-283  DOI: 10.1016/j.neucom.2013.05.038  出版年: DEC 25 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: This paper presents a method for face recognition using multi-scale Weber local descriptors (WLDs) and multi-level information fusion. Our method introduces the WLD, a novel and robust local descriptor, to describe the facial images and modifies it by a non-linear quantization approach to enhance its discriminative power. Moreover, a multi-scale framework for WLD extraction with multi-level information fusion approaches is provided for face representation and recognition. The proposed method has four main steps: (1) image partition: under given rules, each facial image is uniformly divided into a set of non-overlapped sub-regions; in this way, for a set of facial images, we therefore have a large pool of this type of sub-regions; (2) feature extraction: in this pool of sub-regions, taking one sub-region as a center, a group of similar ones are chosen for extraction of WLD histogram features; (3) features measurement: these WLD histograms are then fused into a single vector as the feature of the center sub-region. Nearest neighborhood on chi-square is employed for similarity measurement between two sub-regions; and (4) voting: the recognition result of the entire probe (a face in sub-regions) is obtained via a voting function on the recognition result of all its sub-regions. Experimental results demonstrate the effectiveness of the proposed method upon three popular datasets. (C) 2013 Elsevier B.V. All rights reserved.
文献类型: Article
作者关键词: Face recognition; Facial image analysis; Weber local descriptors (WLDs); Information fusion
KeyWords Plus: NONNEGATIVE MATRIX FACTORIZATION; INDEPENDENT COMPONENT ANALYSIS; REPRESENTATION; ROBUST; SPACE; MODEL; PCA
Web of Science 类别: Computer Science, Artificial Intelligence
研究方向: Computer Science
IDS 号: 233SQ 
ISSN: 0925-2312 
电子 ISSN: 1872-8286 


第 3 条,共 223 条
标题: Subwavelength multiple focal spots produced by tight focusing the patterned vector optical fields 
作者: Cai, MQ (Cai, Mengqiang); Tu, CH (Tu, Chenghou); Zhang, HH (Zhang, Huihui); Qian, SX (Qian, Shengxia); Lou, K (Lou, Kai); Li, YN (Li, Yongnan); Wang, HT (Wang, Hui-Tian)
来源出版物: OPTICS EXPRESS  卷: 21  期: 25  页: 31469-31482  DOI: 10.1364/OE.21.031469  出版年: DEC 16 2013  
Web of Science 核心合集中的 "被引频次": 2 
被引频次合计: 2 
摘要: We numerically and experimentally explored generation and regulation of subwavelength multiple focal spots produced by tight focusing patterned vector optical fields (PVOFs). We presented a modified Richard-Wolf diffraction integration method suitable for the tight focusing of the PVOFs. By tailoring the spatial geometry and the polarization distributions of the PVOFs, simulations show that the diverse spatial configurations of subwavelength multiple focal spots can be achieved. To verify our idea, we experimentally generated the theoretically calculated examples of femtosecond PVOFs, then tightly focused them on the surface of the crystalline silicon wafers, and finally characterized the morphologies of modified surfaces. The SEM (scanning electronic microscopy) images confirmed that the experimental results are in good agreement with the simulations. Based on the diverse controlling degrees of freedom of PVOFs, the resultant subwavelength focal fields are flexible and powerful in parallel processing, optical manipulation and so on. (C) 2013 Optical Society of America
PubMed ID: 24514721 
文献类型: Article
KeyWords Plus: PERIODIC STRUCTURES; LASER-BEAMS; INTERFERENCE; POLARIZATION; DIFFRACTION; FABRICATION; GENERATION; CREATION; LIGHT
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 273ZV 
ISSN: 1094-4087 


第 4 条,共 223 条
标题: Phase retrieval with resolution enhancement by using structured illumination 
作者: Gao, P (Gao, Peng); Pedrini, G (Pedrini, Giancarlo); Osten, W (Osten, Wolfgang)
来源出版物: OPTICS LETTERS  卷: 38  期: 24  页: 5204-5207  DOI: 10.1364/OL.38.005204  出版年: DEC 15 2013  
Web of Science 核心合集中的 "被引频次": 3 
被引频次合计: 3 
摘要: In this Letter, we present referenceless phase retrieval methods with resolution enhancement. Structured illuminations with different orientations and phase shifts are generated by a spatial light modulator and are used to illuminate the specimen. The generated diffraction patterns are recorded by a CCD camera, and the phase of the wavefront is reconstructed from these patterns. (C) 2013 Optical Society of America
PubMed ID: 24322218 
文献类型: Article
KeyWords Plus: DIGITAL HOLOGRAPHIC MICROSCOPY; WAVE-FRONT RECONSTRUCTION; LATERAL RESOLUTION; SUPERRESOLUTION; INTERFEROMETRY; LIMIT; FIELD
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 275UB 
ISSN: 0146-9592 
电子 ISSN: 1539-4794 


第 5 条,共 223 条
标题: 1.23 mu m emission of Er-doped water-free fluorotellurite glasses 
作者: Zhan, H (Zhan, Huan); He, JL (He, Jianli); Zhou, ZG (Zhou, Zhiguang); Zhang, AD (Zhang, Aidong); Si, JH (Si, Jinhai); Lin, AX (Lin, Aoxiang)
来源出版物: PHYSICS AND CHEMISTRY OF GLASSES-EUROPEAN JOURNAL OF GLASS SCIENCE AND TECHNOLOGY PART B  卷: 54  期: 6  页: 260-263  出版年: DEC 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: To identify more efficient materials for 1.2 mu m fibre optical amplifiers, we report on near-infrared emission centred at 1.23 mu m from Er3+-doped water-free fluorotellurite glasses with the composition 60TeO(2)-30ZnF(2)-10NaF (TZNF60, mol%). Pumped by an OPO laser system at 523 nm, emission at 1.23 mu m (Er3+:S-4(3/2)-> I-4(11/2) transition) was observed; the tau(f) at 1.23 mu m is 21.6-86.4 mu s, arising from the optimized water-free surroundings and lower phonon energy arising from the addition of a large amount of fluoride into the tellurite-based host glass. 0.5 wt% Er2O3 doped TZNF60 glass is regarded as a promising material for the development of optical amplification and laser operation at the relatively unexplored 1.2 mu m region as it has the highest quantum efficiency and the largest figure of merit among this group of Er-TZNF60 glasses.
文献类型: Article
KeyWords Plus: TELLURITE GLASSES; OPTICAL-TRANSITIONS; AMPLIFIERS; FIBER; LASER; IONS; TM3+
Web of Science 类别: Chemistry, Physical; Materials Science, Ceramics
研究方向: Chemistry; Materials Science
IDS 号: 289MJ 
ISSN: 1753-3562 


第 6 条,共 223 条
标题: Passively harmonic mode locking in ytterbium-doped fiber laser with graphene oxide saturable absorber 
作者: Li, HQ (Li, Huiquan); Wang, YG (Wang, Yonggang); Yan, PG (Yan, Peiguang); Cao, GZ (Cao, Guangzhong); Zhao, JQ (Zhao, Junqing); Zhang, GL (Zhang, Gelin); Huang, SS (Huang, Shisheng); Lin, RY (Lin, Rongyong)
来源出版物: OPTICAL ENGINEERING  卷: 52  期: 12  文献号: 126102  DOI: 10.1117/1.OE.52.12.126102  出版年: DEC 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: We have demonstrated the dissipative solitons generated in an ytterbium-doped fiber laser cavity using graphene oxide as the saturable absorber. The lasing light, centered at 1077.2 nm, has a 3 dB spectral bandwidth of similar to 1.12 nm. Under different launched pump powers and appropriate polarization orientations, harmonic mode-locked of second-and third-order pulse trains have been achieved; the corresponding 3-dB bandwidth and pulse duration have been detected. (C) The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
文献类型: Article
作者关键词: graphene oxide saturable absorber; all-fiber laser; ytterbium-doped fiber; harmonic mode locking
KeyWords Plus: ATOMIC-LAYER GRAPHENE; PHOTONICS; OPTOELECTRONICS; GENERATION; SOLITONS
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 287EZ 
ISSN: 0091-3286 
电子 ISSN: 1560-2303 


第 7 条,共 223 条
标题: Off-axis digital holographic microscopy with LED illumination based on polarization filtering 
作者: Guo, RL (Guo, Rongli); Yao, BL (Yao, Baoli); Gao, P (Gao, Peng); Min, JW (Min, Junwei); Zhou, ML (Zhou, Meiling); Han, J (Han, Jun); Yu, X (Yu, Xun); Yu, XH (Yu, Xianghua); Lei, M (Lei, Ming); Yan, SH (Yan, Shaohui); Yang, YL (Yang, Yanlong); Dan, D (Dan, Dan); Ye, T (Ye, Tong)
来源出版物: APPLIED OPTICS  卷: 52  期: 34  页: 8233-8238  DOI: 10.1364/AO.52.008233  出版年: DEC 1 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: A reflection mode digital holographic microscope with light emitting diode (LED) illumination and off-axis interferometry is proposed The setup is comprised of a Linnik interferometer and a grating based 41 imaging unit. Both object and reference waves travel coaxially and are split into multiple diffraction orders in the Fourier plane by the grating. The zeroth and first orders are filtered by a polarizing array to select orthogonally polarized object waves and reference waves. Subsequently, the object and reference waves are combined again in the output plane of the 4f system, and then the hologram with uniform contrast over the entire field of view can be acquired with the aid of a polarizer. The one-shot nature in the off-axis configuration enables an interferometric recording time on a millisecond scale. The validity of the proposed setup is illustrated by imaging nanostructured substrates, and the experimental results demonstrate that the phase noise is reduced drastically by an order of 68% when compared to a He Ne laser-based result. (C) 2013 Optical Society of America
PubMed ID: 24513823 
文献类型: Article
KeyWords Plus: QUANTITATIVE PHASE MICROSCOPY; LIGHT-EMITTING DIODE; FULL-FIELD; CONTRAST MICROSCOPY; NOISE-REDUCTION; WHITE-LIGHT; INSPECTION; ACCURACY; OBJECTS
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 272HC 
ISSN: 1559-128X 
电子 ISSN: 2155-3165 


第 8 条,共 223 条
标题: Design of Airborne Dual Channel Ultraviolet-Visible Imaging Spectrometer with Large Field of View, Wide Spectrum, and High Resolution 
作者: Hao, AH (Hao Ai-hua); Hu, BL (Hu Bing-liang); Bai, JG (Bai Jia-guang); Li, LB (Li Li-bo); Yu, T (Yu Tao); Li, SY (Li Si-yuan)
来源出版物: SPECTROSCOPY AND SPECTRAL ANALYSIS  卷: 33  期: 12  页: 3432-3436  DOI: 10.3964/j.issn.1000-0593(2013)12-3432-05  出版年: DEC 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: The ultraviolet-visible (UV-Vis 200 similar to 500 nm) imaging spectrometer is an important part of space remote sensing. Based on special requirements and practical application of the airborne UV-VIS spectrometer, a kind of scanning imaging spectrometer using area array CCD is proposed, which can meet the application requirements of large field of view, wide spectrum and high resolution. It overcomes low spatial resolution of traditional line array CCD scanning imaging spectrometer, and limited field of view of the pushbroom imaging spectrometer. In addition, dual channel was designed to reduce stray light. 400 similar to 500 nm band includes two order spectrum for 200 similar to 250 nm band, and variation of radiance from earth between the shorter wavelength (<290 nm) and the longer wavelength (>310 nm) is above three orders of magnitude. In the structure design of the system, the imaging spectrometer is composed of a two-mirror concentric telescope and two Czerny-Turner plane grating imaging spectrometers. The whole system doesn't use any additional optical elements in addition to spherical mirrors. The whole system has the advantage of simple structure, excellent performance, and very good feasibility. The modulation transfer function value of full spectrum and full field of view is above 0. 6.
文献类型: Article
作者关键词: Large field of view; Wide spectrum; High resolution; Ultraviolet; Imaging spectrometer
KeyWords Plus: ASTIGMATISM; MIRRORS
Web of Science 类别: Spectroscopy
研究方向: Spectroscopy
IDS 号: 275WT 
ISSN: 1000-0593 


第 9 条,共 223 条
标题: Linear Tracking for 3-D Medical Ultrasound Imaging 
作者: Huang, QH (Huang, Qing-Hua); Yang, Z (Yang, Zhao); Hu, W (Hu, Wei); Jin, LW (Jin, Lian-Wen); Wei, G (Wei, Gang); Li, XL (Li, Xuelong)
来源出版物: IEEE TRANSACTIONS ON CYBERNETICS  卷: 43  期: 6  特刊: SI  页: 1747-1754  DOI: 10.1109/TSMCC.2012.2229270  出版年: DEC 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: As the clinical application grows, there is a rapid technical development of 3-D ultrasound imaging. Compared with 2-D ultrasound imaging, 3-D ultrasound imaging can provide improved qualitative and quantitative information for various clinical applications. In this paper, we proposed a novel tracking method for a freehand 3-D ultrasound imaging system with improved portability, reduced degree of freedom, and cost. We designed a sliding track with a linear position sensor attached, and it transmitted positional data via a wireless communication module based on Bluetooth, resulting in a wireless spatial tracking modality. A traditional 2-D ultrasound probe fixed to the position sensor on the sliding track was used to obtain real-time B-scans, and the positions of the B-scans were simultaneously acquired when moving the probe along the track in a freehand manner. In the experiments, the proposed method was applied to ultrasound phantoms and real human tissues. The results demonstrated that the new system outperformed a previously developed freehand system based on a traditional six-degree-of-freedom spatial sensor in phantom and in vivo studies, indicating its merit in clinical applications for human tissues and organs.
PubMed ID: 23757592 
文献类型: Article
作者关键词: Application system; one degree of freedom; volume reconstruction; wireless spatial tracking; 3-D ultrasound
KeyWords Plus: FREEHAND 3D ULTRASOUND; 3-DIMENSIONAL ULTRASOUND; SYSTEM; RECONSTRUCTION; CALIBRATION
Web of Science 类别: Computer Science, Artificial Intelligence; Computer Science, Cybernetics
研究方向: Computer Science
IDS 号: 261EP 
ISSN: 2168-2267 
电子 ISSN: 2168-2275 


第 10 条,共 223 条
标题: Learning Discriminative Key Poses for Action Recognition 
作者: Liu, L (Liu, Li); Shao, L (Shao, Ling); Zhen, XT (Zhen, Xiantong); Li, XL (Li, Xuelong)
来源出版物: IEEE TRANSACTIONS ON CYBERNETICS  卷: 43  期: 6  特刊: SI  页: 1860-1870  DOI: 10.1109/TSMCB.2012.2231959  出版年: DEC 2013  
Web of Science 核心合集中的 "被引频次": 3 
被引频次合计: 3 
摘要: In this paper, we present a new approach for human action recognition based on key-pose selection and representation. Poses in video frames are described by the proposed extensive pyramidal features (EPFs), which include the Gabor, Gaussian, and wavelet pyramids. These features are able to encode the orientation, intensity, and contour information and therefore provide an informative representation of human poses. Due to the fact that not all poses in a sequence are discriminative and representative, we further utilize the AdaBoost algorithm to learn a subset of discriminative poses. Given the boosted poses for each video sequence, a new classifier named weighted local naive Bayes nearest neighbor is proposed for the final action classification, which is demonstrated to be more accurate and robust than other classifiers, e.g., support vector machine (SVM) and naive Bayes nearest neighbor. The proposed method is systematically evaluated on the KTH data set, the Weizmann data set, the multiview IXMAS data set, and the challenging HMDB51 data set. Experimental results manifest that our method outperforms the state-of-the-art techniques in terms of recognition rate.
PubMed ID: 23757577 
文献类型: Article
作者关键词: AdaBoost; computer vision; extensive pyramidal features (EPFs); human action recognition; pose selection; weighted local naive Bayes nearest neighbor (WLNBNN) classifier
KeyWords Plus: WAVELET TRANSFORM; CLASSIFICATION; REGRESSION; FEATURES; POINTS
Web of Science 类别: Computer Science, Artificial Intelligence; Computer Science, Cybernetics
研究方向: Computer Science
IDS 号: 261EP 
ISSN: 2168-2267 
电子 ISSN: 2168-2275 


第 11 条,共 223 条
标题: Learning Saliency by MRF and Differential Threshold 
作者: Zhu, GK (Zhu, Guokang); Wang, Q (Wang, Qi); Yuan, Y (Yuan, Yuan); Yan, PK (Yan, Pingkun)
来源出版物: IEEE TRANSACTIONS ON CYBERNETICS  卷: 43  期: 6  特刊: SI  页: 2032-2043  DOI: 10.1109/TSMCB.2013.2238927  出版年: DEC 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: Saliency detection has been an attractive topic in recent years. The reliable detection of saliency can help a lot of useful processing without prior knowledge about the scene, such as content-aware image compression, segmentation, etc. Although many efforts have been spent in this subject, the feature expression and model construction are far from perfect. The obtained saliency maps are therefore not satisfying enough. In order to overcome these challenges, this paper presents a new psychologic visual feature based on differential threshold and applies it in a supervised Markov-random-field framework. Experiments on two public data sets and an image retargeting application demonstrate the effectiveness, robustness, and practicability of the proposed method.
PubMed ID: 23757590 
文献类型: Article
作者关键词: Computer vision; differential threshold; machine learning; Markov random field (MRF); saliency detection; visual attention
KeyWords Plus: SELECTIVE VISUAL-ATTENTION; OBJECT RECOGNITION; REGION DETECTION; CLUTTERED SCENES; IMAGE; COLOR; SEGMENTATION; MODEL; CONTRAST; CONTEXT
Web of Science 类别: Computer Science, Artificial Intelligence; Computer Science, Cybernetics
研究方向: Computer Science
IDS 号: 261EP 
ISSN: 2168-2267 
电子 ISSN: 2168-2275 


第 12 条,共 223 条
标题: Spectral Segmentation via Midlevel Cues Integrating Geodesic and Intensity 
作者: Lu, HC (Lu, Huchuan); Zhang, RX (Zhang, Ruixuan); Li, SF (Li, Shifeng); Li, XL (Li, Xuelong)
来源出版物: IEEE TRANSACTIONS ON CYBERNETICS  卷: 43  期: 6  特刊: SI  页: 2170-2178  DOI: 10.1109/TCYB.2013.2243432  出版年: DEC 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: Image segmentation still remains as a challenge in image processing and pattern recognition when involving complex natural scenes. In this paper, we present a new affinity model for spectral segmentation based on midlevel cues. In contrast to most existing methods that operate directly on low-level cues, we first oversegment the image into superpixel images and then integrate the geodesic line edge and intensity cue to form the similarity matrix W so that it more accurately describes the similarity between data. The geodesic line edge could avoid strong boundary and represent the true boundary between two superpixels while the mean red green blue vector could describe the intensity of superpixels better. As far as we know, this is a totally new kind of affinity model to represent superpixels. Based on this model, we use the spectral clustering in the superpixel level and then achieve the image segmentation in the pixel level. The experimental results show that the proposed method performs steadily and well on various natural images. The evaluation comparisons also prove that our method achieves comparable accuracy and significantly performs better than most state-of-the-art algorithms.
PubMed ID: 23757526 
文献类型: Article
作者关键词: Geodesic; PR curve; spectral clustering; superpixel; unsupervised segmentation
KeyWords Plus: IMAGE SEGMENTATION; NATURAL IMAGES; ALGORITHMS; COMPRESSION; TEXTURE; COLOR
Web of Science 类别: Computer Science, Artificial Intelligence; Computer Science, Cybernetics
研究方向: Computer Science
IDS 号: 261EP 
ISSN: 2168-2267 
电子 ISSN: 2168-2275 


第 13 条,共 223 条
标题: LDFT-Based Watermarking Resilient to Local Desynchronization Attacks 
作者: Tian, HW (Tian, Huawei); Zhao, Y (Zhao, Yao); Ni, RR (Ni, Rongrong); Qin, LM (Qin, Lunming); Li, XL (Li, Xuelong)
来源出版物: IEEE TRANSACTIONS ON CYBERNETICS  卷: 43  期: 6  特刊: SI  页: 2190-2201  DOI: 10.1109/TCYB.2013.2245415  出版年: DEC 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: Up to now, a watermarking scheme that is robust against desynchronization attacks (DAs) is still a grand challenge. Most image watermarking resynchronization schemes in literature can survive individual global DAs (e.g., rotation, scaling, translation, and other affine transforms), but few are resilient to challenging cropping and local DAs. The main reason is that robust features for watermark synchronization are only globally invariable rather than locally invariable. In this paper, we present a blind image watermarking resynchronization scheme against local transform attacks. First, we propose a new feature transform named local daisy feature transform (LDFT), which is not only globally but also locally invariable. Then, the binary space partitioning (BSP) tree is used to partition the geometrically invariant LDFT space. In the BSP tree, the location of each pixel is fixed under global transform, local transform, and cropping. Lastly, the watermarking sequence is embedded bit by bit into each leaf node of the BSP tree by using the logarithmic quantization index modulation watermarking embedding method. Simulation results show that the proposed watermarking scheme can survive numerous kinds of distortions, including common image-processing attacks, local and global DAs, and noninvertible cropping.
PubMed ID: 23757528 
文献类型: Article
作者关键词: Local daisy feature transform (LDFT); robust; watermarking
KeyWords Plus: DIGITAL IMAGE WATERMARKING; INTEREST POINT DETECTORS; GEOMETRIC DISTORTIONS; PART I; ROBUST; ALGORITHMS; SCALE; RECOGNITION; TRANSFORM; FEATURES
Web of Science 类别: Computer Science, Artificial Intelligence; Computer Science, Cybernetics
研究方向: Computer Science
IDS 号: 261EP 
ISSN: 2168-2267 
电子 ISSN: 2168-2275 


第 14 条,共 223 条
标题: Joint Optimization Toward Effective and Efficient Image Search 
作者: Wei, SK (Wei, Shikui); Xu, D (Xu, Dong); Li, XL (Li, Xuelong); Zhao, Y (Zhao, Yao)
来源出版物: IEEE TRANSACTIONS ON CYBERNETICS  卷: 43  期: 6  特刊: SI  页: 2216-2227  DOI: 10.1109/TCYB.2013.2245890  出版年: DEC 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: The bag-of-words (BoW) model has been known as an effective method for large-scale image search and indexing. Recent work shows that the performance of the model can be further improved by using the embedding method. While different variants of the BoW model and embedding method have been developed, less effort has been made to discover their underlying working mechanism. In this paper, we systematically investigate the image search performance variation with respect to a few factors of the BoW model, and study how to employ the embedding method to further improve the image search performance. Subsequently, we summarize several observations based on the experiments on descriptor matching. To validate these observations in a real image search, we propose an effective and efficient image search scheme, in which the BoW model and embedding method are jointly optimized in terms of effectiveness and efficiency by following these observations. Our comprehensive experiments demonstrate that it is beneficial to employ these observations to develop an image search algorithm, and the proposed image search scheme outperforms state-of-the-art methods in both effectiveness and efficiency.
PubMed ID: 23757530 
文献类型: Article
作者关键词: Bag-of-words (BoW); embedding method; high effectiveness; high efficiency; large scale image search
KeyWords Plus: CLASSIFICATION; FEATURES; RETRIEVAL; MODEL
Web of Science 类别: Computer Science, Artificial Intelligence; Computer Science, Cybernetics
研究方向: Computer Science
IDS 号: 261EP 
ISSN: 2168-2267 
电子 ISSN: 2168-2275 


第 15 条,共 223 条
标题: Image Super-Resolution via Double Sparsity Regularized Manifold Learning 
作者: Lu, XQ (Lu, Xiaoqiang); Yuan, Y (Yuan, Yuan); Yan, PK (Yan, Pingkun)
来源出版物: IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY  卷: 23  期: 12  页: 2022-2033  DOI: 10.1109/TCSVT.2013.2244798  出版年: DEC 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: Over the past few years, high resolutions have been desirable or essential, e. g., in online video systems, and therefore, much has been done to achieve an image of higher resolution from the corresponding low-resolution ones. This procedure of recovering/rebuilding is called single-image super-resolution (SR). Performance of image SR has been significantly improved via methods of sparse coding. That is to say, the image frame patch can be sparse linear combinations of basis elements. However, most of these existing methods fail to consider the local geometrical structure in the space of the training data. To take this crucial issue into account, this paper proposes a method named double sparsity regularized manifold learning (DSRML). DSRML can preserve the properties of the aforementioned local geometrical structure by employing manifold learning, e. g., locally linear embedding. Based on a large amount of experimental results, DSRML is demonstrated to be more robust and more effective than previous efforts in the task of single-image SR.
文献类型: Article
作者关键词: Double sparsity; manifold learning; single-image super-resolution (SR); sparse coding
KeyWords Plus: NONLINEAR DIMENSIONALITY REDUCTION; QUALITY ASSESSMENT; ALGORITHM; REPRESENTATIONS; RECONSTRUCTION; INTERPOLATION; DICTIONARIES; INFORMATION; REGRESSION; ROBUST
Web of Science 类别: Engineering, Electrical & Electronic
研究方向: Engineering
IDS 号: 266TQ 
ISSN: 1051-8215 
电子 ISSN: 1558-2205 


第 16 条,共 223 条
标题: Universal Blind Image Quality Assessment Metrics Via Natural Scene Statistics and Multiple Kernel Learning 
作者: Gao, XB (Gao, Xinbo); Gao, F (Gao, Fei); Tao, DC (Tao, Dacheng); Li, XL (Li, Xuelong)
来源出版物: IEEE TRANSACTIONS ON NEURAL NETWORKS AND LEARNING SYSTEMS  卷: 24  期: 12  页: 2013-2026  DOI: 10.1109/TNNLS.2013.2271356  出版年: DEC 2013  
Web of Science 核心合集中的 "被引频次": 3 
被引频次合计: 3 
摘要: Universal blind image quality assessment (IQA) metrics that can work for various distortions are of great importance for image processing systems, because neither ground truths are available nor the distortion types are aware all the time in practice. Existing state-of-the-art universal blind IQA algorithms are developed based on natural scene statistics (NSS). Although NSS-based metrics obtained promising performance, they have some limitations: 1) they use either the Gaussian scale mixture model or generalized Gaussian density to predict the nonGaussian marginal distribution of wavelet, Gabor, or discrete cosine transform coefficients. The prediction error makes the extracted features unable to reflect the change in nonGaussianity (NG) accurately. The existing algorithms use the joint statistical model and structural similarity to model the local dependency (LD). Although this LD essentially encodes the information redundancy in natural images, these models do not use information divergence to measure the LD. Although the exponential decay characteristic (EDC) represents the property of natural images that large/small wavelet coefficient magnitudes tend to be persistent across scales, which is highly correlated with image degradations, it has not been applied to the universal blind IQA metrics; and 2) all the universal blind IQA metrics use the same similarity measure for different features for learning the universal blind IQA metrics, though these features have different properties. To address the aforementioned problems, we propose to construct new universal blind quality indicators using all the three types of NSS, i.e., the NG, LD, and EDC, and incorporating the heterogeneous property of multiple kernel learning (MKL). By analyzing how different distortions affect these statistical properties, we present two universal blind quality assessment models, NSS global scheme and NSS two-step scheme. In the proposed metrics: 1) we exploit the NG of natural images using the original marginal distribution of wavelet coefficients; 2) we measure correlations between wavelet coefficients using mutual information defined in information theory; 3) we use features of EDC in universal blind image quality prediction directly; and 4) we introduce MKL to measure the similarity of different features using different kernels. Thorough experimental results on the Laboratory for Image and Video Engineering database II and the Tampere Image Database2008 demonstrate that both metrics are in remarkably high consistency with the human perception, and overwhelm representative universal blind algorithms as well as some standard full reference quality indexes for various types of distortions.
PubMed ID: 24805219 
文献类型: Article
作者关键词: Exponential decay characteristic (EDC); image quality assessment (IQA); multiple kernel learning (MKL); natural scene statistics (NSS)
KeyWords Plus: STRUCTURAL SIMILARITY; CONTOURLET DOMAIN; INFORMATION; BLUR; ALGORITHMS; JPEG2000; FUSION; INDEX
Web of Science 类别: Computer Science, Artificial Intelligence; Computer Science, Hardware & Architecture; Computer Science, Theory & Methods; Engineering, Electrical & Electronic
研究方向: Computer Science; Engineering
IDS 号: 251OW 
ISSN: 2162-237X 
电子 ISSN: 2162-2388 


第 17 条,共 223 条
标题: Multi-spectral dataset and its application in saliency detection 
作者: Wang, Q (Wang, Qi); Zhu, GK (Zhu, Guokang); Yuan, Y (Yuan, Yuan)
来源出版物: COMPUTER VISION AND IMAGE UNDERSTANDING  卷: 117  期: 12  页: 1748-1754  DOI: 10.1016/j.cviu.2013.07.002  出版年: DEC 2013  
Web of Science 核心合集中的 "被引频次": 3 
被引频次合计: 3 
摘要: Saliency detection has been researched a lot in recent years. Traditional methods are mostly conducted and evaluated on conventional RGB images. Few work has considered the incorporation of multi-spectral clues. Considering the success of including near-infrared spectrum in applications such as face recognition and scene categorization, this paper presents a multi-spectral dataset and applies it in saliency detection. Experiments demonstrate that the incorporation of near-infrared band is effective in the saliency detection procedure. We also test the combinational models for integrating visible and near-infrared bands. Results show that there is no single model to effect on every saliency detection method. Models should be selected according to the specific employed method. (C) 2013 Elsevier Inc. All rights reserved.
文献类型: Article
作者关键词: Multi-spectral; Near-infrared; Saliency; Regression model
KeyWords Plus: VISUAL-ATTENTION; REGION DETECTION; COLOR; IMAGES; FEATURES; OBJECTS; MODEL
Web of Science 类别: Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic
研究方向: Computer Science; Engineering
IDS 号: 240ZQ 
ISSN: 1077-3142 
电子 ISSN: 1090-235X 


第 18 条,共 223 条
标题: Theoretical and experimental study of 37-core waveguides with large mode area 
作者: Wang, P (Wang, Ping); Cheng, GH (Cheng, Guanghua); Yi, RM (Yi, Ruimin); Liu, X (Liu, Xin); Shang, T (Shang, Tao); Wang, ZS (Wang, Zhansheng); Guo, LX (Guo, Lixin)
来源出版物: APPLIED OPTICS  卷: 52  期: 33  页: 7981-7986  DOI: 10.1364/AO.52.007981  出版年: NOV 20 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: The evanescently coupled multicore waveguide lattice composed of 37 linear type I cores hexagonally arranged has been theoretically studied and fabricated by low-repetition-rate femtosecond laser inscription of bulk fused silica. The effects of the single core's numerical apertures (NAs) and spacing on the mode characteristics of the 37-core waveguide were calculated by the finite-element method. It was found that the mode field areas of the fundamental mode LP01 with 5 mu m spacing of different NAs were all larger than 577 mu m(2), which was confirmed by the experiments. The measured near-field mode profiles for different writing conditions and different spacing also showed that the waveguide supported both a single mode (LP01) and two modes (LP01 and LP11). The multicore waveguide, according to our study, is particularly interesting for mode converters. (C) 2013 Optical Society of America
PubMed ID: 24513748 
文献类型: Article
KeyWords Plus: ULTRAFAST LASER PHOTOINSCRIPTION; FEMTOSECOND-LASER; FUSED-SILICA; POLARIZATION FUNCTIONS; OPTICAL-PROPERTIES; PHOTONIC DEVICES; WRITTEN; GLASS; FABRICATION; PULSES
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 258NY 
ISSN: 1559-128X 
电子 ISSN: 2155-3165 


第 19 条,共 223 条
标题: Engineering of phase matching for mid-infrared coherent anti-Stokes Raman wavelength conversion with orthogonally polarized pump and Stokes waves in silicon-on-sapphire waveguides 
作者: Wang, ZL (Wang, Zhaolu); Liu, HJ (Liu, Hongjun); Huang, N (Huang, Nan); Sun, QB (Sun, Qibing); Li, XF (Li, Xuefeng)
来源出版物: APPLIED OPTICS  卷: 52  期: 33  页: 8095-8101  DOI: 10.1364/AO.52.008095  出版年: NOV 20 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: The conversion efficiency of mid-infrared wavelength conversion based on coherent anti-Stokes Raman scattering with TE-polarized pump and TM-polarized Stokes waves is theoretically investigated in silicon-on-sapphire (SOS) waveguides. The peak conversion efficiency of -10 dB is obtained when the linear propagation loss is 1 dB/cm at Delta k = 0; however, it is reduced to -13.6 dB when the linear propagation loss is 2 dB/cm. The phase matching for wavelength conversion with orthogonally polarized pump and Stokes waves can be realized by engineering the birefringence in SOS waveguides, because proper phase mismatch induced by birefringence together with material dispersion-induced phase mismatch can counteract the large phase mismatch induced by waveguide dispersion. Moreover, compared with the phase matching for identically polarized pump and Stokes waves, the phase matching for orthogonally polarized pump and Stokes waves can be realized in a SOS waveguide with much smaller cross section, which reduces the power requirement for optical systems. (C) 2013 Optical Society of America
PubMed ID: 24513763 
文献类型: Article
KeyWords Plus: NANOWAVEGUIDES; LASER
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 258NY 
ISSN: 1559-128X 
电子 ISSN: 2155-3165 


第 20 条,共 223 条
标题: Flexible high-repetition-rate ultrafast fiber laser 
作者: Mao, D (Mao, Dong); Liu, XM (Liu, Xueming); Sun, ZP (Sun, Zhipei); Lu, H (Lu, Hua); Han, DD (Han, Dongdong); Wang, GX (Wang, Guoxi); Wang, FQ (Wang, Fengqiu)
来源出版物: SCIENTIFIC REPORTS  卷: 3  文献号: 3223  DOI: 10.1038/srep03223  出版年: NOV 14 2013  
Web of Science 核心合集中的 "被引频次": 10 
被引频次合计: 10 
摘要: High-repetition-rate pulses have widespread applications in the fields of fiber communications, frequency comb, and optical sensing. Here, we have demonstrated high-repetition-rate ultrashort pulses in an all-fiber laser by exploiting an intracavity Mach-Zehnder interferometer (MZI) as a comb filter. The repetition rate of the laser can be tuned flexibly from about 7 to 1100 GHz by controlling the optical path difference between the two arms of the MZI. The pulse duration can be reduced continuously from about 10.1 to 0.55 ps with the spectral width tunable from about 0.35 to 5.7 nm by manipulating the intracavity polarization controller. Numerical simulations well confirm the experimental observations and show that filter-driven four-wave mixing effect, induced by the MZI, is the main mechanism that governs the formation of the high-repetition-rate pulses. This all-fiber-based laser is a simple and low-cost source for various applications where high-repetition-rate pulses are necessary.
PubMed ID: 24226153 
文献类型: Article
KeyWords Plus: MODE-LOCKING; CARBON NANOTUBES; GENERATION; SOLITONS; DISPERSION
Web of Science 类别: Multidisciplinary Sciences
研究方向: Science & Technology - Other Topics
IDS 号: 252PV 
ISSN: 2045-2322 


第 21 条,共 223 条
标题: Computational imaging technology for high-sensitivity space-image acquisition 
作者: Sun, JQ (Sun, Jinqiu); Li, HS (Li, Haisen); Zhang, HC (Zhang, Haichao); Zhang, YN (Zhang, Yanning); Wen, DS (Wen, Desheng)
来源出版物: CHINESE OPTICS LETTERS  卷: 11  期: 11  文献号: 111101  DOI: 10.3788/COL201311.111101  出版年: NOV 10 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 1 
摘要: Acquiring deep-space images with high spatial resolution and sensitivity is important for space-debris surveillance and early warning. We propose a novel computational imaging (CI) method for high-sensitivity image acquisition in this letter. The proposed approach introduces CI into image formation. The proposed capturing process conducts minor modifications for cameras to encode more desirable information during capture, which is practical for hardware implementation. The latent image is reconstructed by formulating a recovery problem into an optimization problem, which is solved with iteratively reweighted least square technique. The experimental results clearly show the effectiveness of the proposed method.
文献类型: Article
KeyWords Plus: APERTURE; DEPTH
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 286MR 
ISSN: 1671-7694 


第 22 条,共 223 条
标题: Investigation of Bessel beam propagation in scattering media with scalar diffraction method 
作者: Zheng, JJ (Zheng, Juanjuan); Yao, BL (Yao, Baoli); Yang, YL (Yang, Yanlong); Lei, M (Lei, Ming); Gao, P (Gao, Peng); Li, RZ (Li, Runze); Yan, SH (Yan, Shaohui); Dan, D (Dan, Dan); Ye, T (Ye, Tong)
来源出版物: CHINESE OPTICS LETTERS  卷: 11  期: 11  文献号: 112601  DOI: 10.3788/COL201311.112601  出版年: NOV 10 2013  
Web of Science 核心合集中的 "被引频次": 2 
被引频次合计: 2 
摘要: Bessel beam propagation in scattering media is simulated using the angular spectrum method combined with slice-by-slice propagation model. Generating Bessel beams with a spatial light modulator, which provides a means to adjust flexibly the parameters of the Bessel beam, allows us to validate the simulation results experimentally. The study reveals that the self-reconstructing length changes oppositely with the axicon angle (i.e., the larger the axicon angle, the shorter the self-reconstructing length). The radius of the incident beam has little influence on the self-reconstruction of the Bessel beam central lobe.
文献类型: Article
KeyWords Plus: SELF-RECONSTRUCTING BEAMS; AXICON; MICROSCOPY; SIMULATION; AMPLITUDE
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 286MR 
ISSN: 1671-7694 


第 23 条,共 223 条
标题: Robust probabilistic tensor analysis for time-variant collaborative filtering 
作者: Pan, J (Pan, Jing); Ma, Z (Ma, Zhao); Pang, YW (Pang, Yanwei); Yuan, Y (Yuan, Yuan)
来源出版物: NEUROCOMPUTING  卷: 119  特刊: SI  页: 139-143  DOI: 10.1016/j.neucom.2012.03.035  出版年: NOV 7 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: The input data of collaborative filtering, also known as recommendation system, are usually sparse and noisy. In addition, in many cases the data are time-variant and have obvious periodic property. In this paper, we take the two characteristics into account. To utilize the time-variant and periodic properties, we describe the data as a three-order tensor and then formulate the collaborative filtering as a problem of probabilistic tensor decomposition with a time-periodical constraint. The robustness is achieved by employing Tsallis divergence to describe the objective function and q-EM algorithm to find the optimal solution. The proposed method is demonstrated on movie recommendation. Experimental results on two Netflix and Movielens databases show the superiority of the proposed method. (C) 2012 Elsevier B.V. All rights reserved.
文献类型: Article
作者关键词: Tensor analysis; Collaborative filtering; Movie recommendation; Topic model
KeyWords Plus: MODELS; VIDEO
Web of Science 类别: Computer Science, Artificial Intelligence
研究方向: Computer Science
IDS 号: 210RI 
ISSN: 0925-2312 


第 24 条,共 223 条
标题: Pedestrian detection in unseen scenes by dynamically updating visual words 
作者: Cao, XB (Cao, Xianbin); Wang, L (Wang, Li); Ning, B (Ning, Bo); Yuan, Y (Yuan, Yuan); Yan, PK (Yan, Pingkun)
来源出版物: NEUROCOMPUTING  卷: 119  特刊: SI  页: 232-242  DOI: 10.1016/j.neucom.2013.03.036  出版年: NOV 7 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: Adapting trained detectors to unseen scenes is a critical problem in pedestrian detection. The performance of trained detector may drop quickly when scenes vary significantly. Retraining a detector with labeled samples from the new scenes may improve its performance. However, it is difficult to obtain enough labeled samples in real applications. In this paper, a novel bag of visual words based method is proposed to detect pedestrians in unseen scenes by dynamically updating the key words. The proposed method achieves its adaptability by using three strategies covering key word selection, detector invariance, and codebook update: (1) In order to select typical words representing pedestrians, a low dimensional model of visual words is built to describe their distribution and select key words using manifold learning. (2) Matching confidence vector (MCV), a novel visual words measurement is proposed, which aims to generate a uniform input vector for the fixed detector applied to different pedestrian codebooks. (3) When detecting pedestrians under changing road conditions, the key word set will be dynamically adjusted according to the matching frequency of each word to adapt the detector to the new scenes. By employing the above strategies, the proposed method is able to detect pedestrians in different scenes without retraining the detector. Experiments in different scenes showed that our proposed method can achieve better adaptability to various scenes and get better performance than other existing methods in unseen scenes. (C) 2013 Elsevier B.V. All rights reserved.
文献类型: Article
作者关键词: Pedestrian detection; Adaptive detector; Bag of visual words; Manifold leaning
KeyWords Plus: NONLINEAR DIMENSIONALITY REDUCTION; OBJECT DETECTION; FEATURES
Web of Science 类别: Computer Science, Artificial Intelligence
研究方向: Computer Science
IDS 号: 210RI 
ISSN: 0925-2312 


第 25 条,共 223 条
标题: Multiring large-mode-area delivery fiber for high power 
作者: Li, L (Li, Lu); Zhang, AD (Zhang, Aidong); Zhan, H (Zhan, Huan); He, JL (He, Jianli); Shi, TF (Shi, Tengfei); Zhou, ZG (Zhou, Zhiguang); Xiao, XS (Xiao, Xusheng); Lin, AX (Lin, Aoxiang)
来源出版物: APPLIED OPTICS  卷: 52  期: 31  页: 7407-7410  DOI: 10.1364/AO.52.007407  出版年: NOV 1 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: The study presents a novel design of multiring delivery fiber with large mode area for high power. Using a FiberCAD method, we investigated a fiber whose core is surrounded by alternative low-and high-index rings. Based on our calculation, the effective area is 400 mu m(2) at 1.08 mu m, larger than the similar to 280 mu m2 of conventional step-index fiber (20/400). The macrobending loss at 1.08 mu m is estimated to be 1 x 10(-3) dB/m, approximately one-third that of conventional step-index fiber (20/400). The single-mode operation can be achieved by the macrobending loss contrast between the fundamental mode (<1 dB/m) and high-order mode (>100 dB/m). The results indicate that multiring delivery fiber fabricated by modified chemical vapor deposition process is a promising candidate for high-power transmission. (C) 2013 Optical Society of America
PubMed ID: 24216638 
文献类型: Article
KeyWords Plus: PHOTONIC CRYSTAL FIBER; SINGLE-MODE; OPTICAL-FIBERS; LARGE-CORE; LASER; OPERATION; AMPLIFICATION; AMPLIFIER
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 246VL 
ISSN: 1559-128X 
电子 ISSN: 2155-3165 


第 26 条,共 223 条
标题: Multiple frequency bands of square split resonant rings and metal wire metamaterial (vol 52, pg 6309, 2013) 
作者: Gao, P (Gao, Peng); Zhang, CM (Zhang, Chunmin); Jia, ZW (Jia, Zongwei); Kang, YQ (Kang, Yongqiang)
来源出版物: APPLIED OPTICS  卷: 52  期: 31  页: 7523-7523  DOI: 10.1364/AO.52.007523  出版年: NOV 1 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
PubMed ID: 24216653 
文献类型: Correction
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 246VL 
ISSN: 1559-128X 
电子 ISSN: 2155-3165 


第 27 条,共 223 条
标题: Visible and near-infrared optical properties of chalcogenide glass waveguides formed by swift Kr ion irradiation 
作者: Liu, T (Liu, Tao); Liu, CX (Liu, Chun-Xiao); Guo, HT (Guo, Hai-Tao); Huang, Q (Huang, Qing); Liu, P (Liu, Peng); Guo, SS (Guo, Sha-Sha); Zhang, L (Zhang, Lian); Zhou, YF (Zhou, Yu-Fan); Sun, JR (Sun, Jian-Rong); Wang, ZG (Wang, Zhi-Guang); Wang, XL (Wang, Xue-Lin)
来源出版物: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS  卷: 314  页: 166-169  DOI: 10.1016/j.nimb.2013.04.066  出版年: NOV 1 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: Planar waveguide structures in chalcogenide glass were fabricated with 17 MeV or 150 MeV swift Kr ion irradiation. Images of the polished end faces of the Kr-irradiated chalcogenide glass were measured with a metallographic microscope using reflected polarized light. SRIM 2010 was used to simulate the electronic and nuclear stopping powers for swift Kr ion irradiation. The micro-Raman spectra were measured in air. The near-field intensity distributions were investigated at visible (633 nm) and near-infrared (1300 nm, 1500 nm, 1539 nm and 1620 nm) bands. These intensity distributions make the waveguide candidates for infrared laser devices. The estimated propagation loss of the waveguide fabricated by 150 MeV swift Kr ion irradiation was approximately 4 dB/cm at a wavelength of 633 nm. (C) 2013 Elsevier B.V. All rights reserved.
文献类型: Article
作者关键词: Optical waveguide; Swift heavy ion irradiation; Infrared band; Chalcogenide glass
KeyWords Plus: CHALCOHALIDE GLASSES; ULTRALOW FLUENCES; BEAM IRRADIATION; LITHIUM-NIOBATE; FIBERS; FABRICATION; GENERATION; SULFIDE
Web of Science 类别: Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear
研究方向: Instruments & Instrumentation; Nuclear Science & Technology; Physics
IDS 号: 246QG 
ISSN: 0168-583X 
电子 ISSN: 1872-9584 


第 28 条,共 223 条
标题: Synthesis and photovoltaic properties of an alternating polymer based fluorene and fluorine substituted quinoxaline derivatives 
作者: Wu, HM (Wu, Haimei); Qu, B (Qu, Bo); Tian, D (Tian, Di); Cong, ZY (Cong, Zhiyuan); Gao, BW (Gao, Bowen); Liu, JQ (Liu, Jianqun); An, ZW (An, Zhongwei); Gao, C (Gao, Chao); Xiao, LX (Xiao, Lixin); Chen, ZJ (Chen, Zhijian); Gong, QH (Gong, Qihuang); Wei, W (Wei, Wei)
来源出版物: REACTIVE & FUNCTIONAL POLYMERS  卷: 73  期: 11  页: 1432-1438  DOI: 10.1016/j.reactfunctpolym.2013.07.015  出版年: NOV 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: An alternating polymer (PFOFTQx) with 9,9-dioctylfluorene (FO) as electron-rich unit and fluorine substituted quinoxaline (FTQx) as electron-withdrawing unit was synthesized and characterized. PFOFTQx showed similar absorption property with that of the counterpart polymer without fluorine atom (synthesized APFO-15). However, the low-lying highest occupied molecular orbit (HOMO) energy level of PFOFTQx was -5.37 eV, about 0.07 eV smaller than that of synthesized APFO-15. In order to study the photovoltaic properties of the materials, polymer solar cells (PSCs) were fabricated with PFOFTQx as donor blended with [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) as acceptor. The power conversion efficiency (PCE) of PSC was 1.77% with a high open-circuit voltage (V-oc) of 0.90 V for an optimized PFOFTQx:PC61BM weight ratio of 1:5, in comparison with that of synthesized APFO-15-based device (PCE of 1.60% with V-oc of 0.77 V). This study indicated that fluorine substituted quinoxaline-based polymers would be promising material with a higher V-oc for the application in polymer solar cells. (C) 2013 Elsevier Ltd. All rights reserved.
文献类型: Article
作者关键词: Polymer solar cells; D-A polymers; Fluorine substituted quinoxaline; Fluorene; Energy level
KeyWords Plus: HETEROJUNCTION SOLAR-CELLS; OPEN-CIRCUIT VOLTAGE; HIGH-PERFORMANCE; EFFICIENCY; COPOLYMER; ELECTRON
Web of Science 类别: Chemistry, Applied; Engineering, Chemical; Polymer Science
研究方向: Chemistry; Engineering; Polymer Science
IDS 号: 245AR 
ISSN: 1381-5148 
电子 ISSN: 1873-166X 


第 29 条,共 223 条
标题: Pyramid-like spikes in a single crystal superalloy produced by picosecond laser irradiation 
作者: Zhang, W (Zhang, Wei); Cui, XZ (Cui, Xiangzhong); Feng, Q (Feng, Qiang); Cheng, GH (Cheng, Guanghua); Ma, GJ (Ma, Guojia); Zhang, XB (Zhang, Xiaobing)
来源出版物: APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING  卷: 113  期: 2  页: 373-377  DOI: 10.1007/s00339-013-7968-9  出版年: NOV 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: Pyramid-like spikes in a single crystal superalloy were investigated upon irradiation with picosecond (ps) laser pulses (200 ps, 800 nm, 1 kHz) under different laser fluences and pulse numbers. Both sides and grooves of pyramid-like spikes were covered with ripples, which had a period of similar to 760 nm. The pyramid-like spike separation increased obviously with increasing laser fluence. Microstructural investigations indicate that the pyramid-like spikes were initiated with subsequent pulses from a smooth surface with corrugations and ripples. The coexistence of capillary waves for spikes and capillary waves for ripples in the melted material can be used to explain the formation of the pyramid-like spikes.
文献类型: Article
KeyWords Plus: PERIODIC SURFACE-STRUCTURE; NICKEL-BASED SUPERALLOY; INDIUM-PHOSPHIDE; FEMTOSECOND; SILICON; ABLATION; PULSES; ARRAYS
Web of Science 类别: Materials Science, Multidisciplinary; Physics, Applied
研究方向: Materials Science; Physics
IDS 号: 227MA 
ISSN: 0947-8396 


第 30 条,共 223 条
标题: Monomode optical planar and channel waveguides in Yb3+-doped silicate glasses formed by helium ion implantation 
作者: Liu, CX (Liu, Chun-Xiao); Cheng, S (Cheng, Shu); Zhao, JH (Zhao, Jin-Hua); Li, WN (Li, Wei-Nan); Wei, W (Wei, Wei); Peng, B (Peng, Bo); Guo, HT (Guo, Hai-Tao)
来源出版物: OPTICS AND LASER TECHNOLOGY  卷: 52  页: 10-14  DOI: 10.1016/j.optlastec.2013.03.017  出版年: NOV 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: Optical planar and channel waveguides in Yb3+-doped silicate glasses are fabricated by triple-energy helium ion implantation at a total dose of 6.0 x 10(16) ions/cm(2). The dark mode spectroscopy of the planar waveguide was measured using a prism coupling arrangement The near-field mode profiles of the planar and channel waveguide were obtained with an end-face coupling system. The refractive index profile was reconstructed by the intensity calculation method. The results indicate that a refractive index enhanced region as well as an optical barrier has been created after the beam process. After post-implantation treatment at 260 degrees C for 1 h, the channel waveguides possessed a propagation loss of similar to 1.2 dB/cm. The acceptable guiding properties suggest that further waveguide lasers may be realized on the He-implanted Yb3+-doped silicate glass waveguides. (C) 2013 Elsevier Ltd. All rights reserved.
文献类型: Article
作者关键词: Waveguides; Ion implantation; Laser materials
KeyWords Plus: REFRACTIVE-INDEX PROFILES; DOPED FIBER; SINGLE; NM
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 165ON 
ISSN: 0030-3992 
电子 ISSN: 1879-2545 


第 31 条,共 223 条
标题: Embedded optical waveguides fabricated in SF10 glass by low-repetition-rate ultrafast laser 
作者: Bai, J (Bai, Jing); Long, XW (Long, Xuewen); Liu, X (Liu, Xin); Huo, GW (Huo, Guangwen); Zhao, W (Zhao, Wei); Stoian, R (Stoian, Razvan); Hui, RQ (Hui, Rongqing); Cheng, GH (Cheng, Guanghua)
来源出版物: APPLIED OPTICS  卷: 52  期: 30  页: 7288-7294  DOI: 10.1364/AO.52.007288  出版年: OCT 20 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 1 
摘要: Symmetric embedded waveguides were fabricated in heavy metal oxide SF10 glass using slit-shaped infrared femtosecond laser writing in the low-repetition frequency regime. The impact of the writing parameters on the waveguide formation in the transverse writing scheme was systemically studied. Results indicate that efficient waveguides can be inscribed in a wide parameter space ranging from 500 fs to 1.5 ps pulse duration, 0.7-4.2 mu J pulse energy, and 5 mu m/s to 640 mu m/s scan speed and pointing out the robustness of the photoinscription process. The refractive index profile reconstructed from the measured near field pattern goes up to 10(-3). In addition, propagation losses of the waveguides are tolerable, with the lowest propagation loss estimated at 0.7 dB/cm. With a 5 mu m/s scan speed and 3.5 mu J pulse energy in a high-dose regime, few-mode guiding was achieved in the waveguide at 800 nm signal injection wavelength. This is due to a combination of increased refractive index in the core of the trace and the appearance of a depressed cladding. (C) 2013 Optical Society of America
PubMed ID: 24216582 
文献类型: Article
KeyWords Plus: SELF-FOCUSING THRESHOLD; FEMTOSECOND-LASER; FUSED-SILICA; LITHIUM-NIOBATE; PULSES; WRITTEN; POLARIZATION; INSCRIPTION; NM
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 238EY 
ISSN: 1559-128X 
电子 ISSN: 2155-3165 


第 32 条,共 223 条
标题: Watt-level passively Q-switched double-cladding fiber laser based on graphene oxide saturable absorber 
作者: Yu, ZH (Yu, Zhenhua); Song, YR (Song, Yanrong); Dong, XZ (Dong, Xinzheng); Li, YL (Li, Yanlin); Tian, JR (Tian, Jinrong); Wang, YG (Wang, Yonggang)
来源出版物: APPLIED OPTICS  卷: 52  期: 29  页: 7127-7131  DOI: 10.1364/AO.52.007127  出版年: OCT 10 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: A watt-level passively Q-switched ytterbium-doped double-cladding fiber laser with a graphene oxide (GO) absorber was demonstrated. The structure of the GO saturable absorber mirror (GO-SAM) was of the sandwich type. A maximum output power of 1.8 W was obtained around a wavelength of 1044 nm. To the best of our knowledge, this is the highest output power in Q-switched fiber lasers based on a GO saturable absorber. The pure GO was protected from the oxygen in the air so that the damage threshold of the GO-SAM was effectively raised. The gain fiber was a D-shaped ytterbium-doped double-cladding fiber. The pulse repetition rates were tuned from 120 to 215 kHz with pump powers from 3.89 to 7.8 W. The maximum pulse energy was 8.37 mu J at a pulse width of 1.7 mu s. (c) 2013 Optical Society of America
PubMed ID: 24217729 
文献类型: Article
KeyWords Plus: MODE-LOCKING
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 236AE 
ISSN: 1559-128X 
电子 ISSN: 2155-3165 


第 33 条,共 223 条
标题: Effective medium theory for two-dimensional random media composed of core-shell cylinders 
作者: Zhang, H (Zhang, Hao); Shen, YQ (Shen, Yongqiang); Xu, YC (Xu, Yuchen); Zhu, HY (Zhu, Heyuan); Lei, M (Lei, Ming); Zhang, XC (Zhang, Xiangchao); Xu, M (Xu, Min)
来源出版物: OPTICS COMMUNICATIONS  卷: 306  页: 9-16  DOI: 10.1016/j.optcom.2013.05.027  出版年: OCT 1 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: In this paper, based on the generalized coated coherent potential approximation method, we derive the mathematical formulae, for the extended effective medium theory, to investigate the optical properties of disordered media composed of core-shell cylinders. The effective indices of such media are obtained in the long-wavelength limit and in the Mie-scattering region. Moreover, we use this method to study optical properties of random media composed of core-shell cylinders with the core layer consisting of epsilon-less-than-one material. (C) 2013 Published by Elsevier B.V.
文献类型: Article
作者关键词: Effective medium theory; Mie scattering; Diffusion
KeyWords Plus: TRANSPORT-PROPERTIES; SCATTERING; SPHERES; LIGHT
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 277FP 
ISSN: 0030-4018 
电子 ISSN: 1873-0310 


第 34 条,共 223 条
标题: Double-cutting beam shaping technique for high-power diode laser area light source 
作者: Huang, ZH (Huang, Zhihua); Xiong, LL (Xiong, Lingling); Liu, H (Liu, Hui); Wang, ZF (Wang, Zhenfu); Zhang, P (Zhang, Pu); Nie, ZQ (Nie, Zhiqiang); Wu, DH (Wu, Dihai); Liu, XS (Liu, Xingsheng)
来源出版物: OPTICAL ENGINEERING  卷: 52  期: 10  文献号: 106108  DOI: 10.1117/1.OE.52.10.106108  出版年: OCT 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: A new beam-shaping technique is proposed to improve the beam quality of a high-power diode laser area light source. It consists of two staggered prism arrays and a reflector array, which can cut the slow axis beam twice and rearrange the divided beams in fast axis to make the beam quality of both axes approximately equal. Furthermore, the beam transformation and compression can be carried out simultaneously, and the assembly error of this technique induced by the machining accuracy of prism's dimensions also can be greatly decreased. By this technique, a fiber-coupled system for one three-bar laser diode stack is designed and characterized. The experimental results demonstrate that the laser beams could be transformed into the required distribution with similar to 93.4% reshaped efficiency and coupled into a 400 mu m/0.22 NA fiber, which are consistent with the theory. (C) 2013 Society of Photo-Optical Instrumentation Engineers (SPIE)
文献类型: Article
作者关键词: beam shaping; beam parameter product; laser diode; fiber coupling
KeyWords Plus: FIBER; STACKS; ARRAYS; BAR
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 269PR 
ISSN: 0091-3286 
电子 ISSN: 1560-2303 


第 35 条,共 223 条
标题: Passive Q-switching in a diode-side-pumped Nd:YAG laser at 1.319 mu m 
作者: Yan, SL (Yan, Shilian); Zhang, L (Zhang, Ling); Yu, HJ (Yu, Haijuan); Li, ML (Li, Menglong); Sun, W (Sun, Wei); Hou, W (Hou, Wei); Lin, XC (Lin, Xuechun); Wang, YG (Wang, Yonggang); Wang, YS (Wang, Yishan)
来源出版物: OPTICAL ENGINEERING  卷: 52  期: 10  文献号: 106107  DOI: 10.1117/1.OE.52.10.106107  出版年: OCT 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: We demonstrated a passively Q-switched Nd:YAG laser operating at 1.319 mu m using a transmission-type single-wall carbon nanotube (SWCNT) as the saturable absorber. This is the first report on using SWCNT as a Q-switcher for 1.319 mu m Nd:YAG laser in a side-pumped configuration. A maximum output power of 780 mW was obtained with 1.15-mu s pulse duration and 42.7-kHz repetition rate. (C) 2013 Society of Photo-Optical Instrumentation Engineers (SPIE)
文献类型: Article
作者关键词: Q-switched; carbon nanotube; side-pumped
KeyWords Plus: NANOTUBE SATURABLE ABSORBER; YAG ROD LASER; MODE-LOCKING; MICROCHIP LASER; ND-YVO4 LASER; GRAPHENE; CR4+YAG; NM
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 269PR 
ISSN: 0091-3286 
电子 ISSN: 1560-2303 


第 36 条,共 223 条
标题: Buried waveguide in neodymium-doped phosphate glass obtained by femtosecond laser writing using a double line approach 
作者: Long, XW (Long, Xuewen); Bai, J (Bai, Jing); Liu, X (Liu, Xin); Zhao, W (Zhao, Wei); Cheng, GH (Cheng, Guanghua)
来源出版物: CHINESE OPTICS LETTERS  卷: 11  期: 10  文献号: 102301  DOI: 10.3788/COL201311.102301  出版年: OCT 1 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 2 
摘要: We fabricate a buried channel waveguide in neodymium-doped phosphate glass using a double line approach by femtosecond laser writing. Raman spectra reveal an expansion of the glass network in the laser irradiated region. Given the stress-induced positive refractive index change, waveguiding between two separated tracks is demonstrated. The refractive index difference profile of the waveguide is reconstructed from the measured near-field mode. Propagation loss is measured by scattering technique. Micro luminescence spectra reveal that the Nd3+ fluorescence property is not significantly affected by waveguide formation process, which indicates that the inscribed waveguide is a good candidate for active device.
文献类型: Article
KeyWords Plus: PULSES; WRITTEN; SILICA
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 256NZ 
ISSN: 1671-7694 


第 37 条,共 223 条
标题: Characteristics of a diode-pumped Yb:CaF2-SrF2 mode-locked laser using a carbon nanotube absorber 
作者: Liu, J (Liu, J.); Feng, C (Feng, C.); Su, LB (Su, L. B.); Jiang, DP (Jiang, D. P.); Zheng, LH (Zheng, L. H.); Qian, XB (Qian, X. B.); Wang, JY (Wang, J. Y.); Xu, J (Xu, J.); Wang, YG (Wang, Y. G.)
来源出版物: LASER PHYSICS LETTERS  卷: 10  期: 10  文献号: 105806  DOI: 10.1088/1612-2011/10/10/105806  出版年: OCT 2013  
Web of Science 核心合集中的 "被引频次": 3 
被引频次合计: 3 
摘要: Yb:CaF2-SrF2 disordered crystals are successfully grown by the TGT method. By using a double-walled carbon nanotube saturable absorber (DWCNT-SA), the continuous-wave mode-locked (CWML) laser properties of Yb:CaF2-SrF2 crystals are demonstrated under diode pumping for the first time. The mode-locked laser delivers pulses as short as 5 ps at a center wavelength of 1045.5 nm without any dispersion compensation. The oscillator operating at a repetition rate of similar to 87 MHz delivers 292 mW average output power.
文献类型: Article
KeyWords Plus: HIGH-POWER; CAF2 LASER; EFFICIENT; YB/CAF2; FEMTOSECOND
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 254IO 
ISSN: 1612-2011 
电子 ISSN: 1612-202X 


第 38 条,共 223 条
标题: Passive Q-switched mode locking of a diode-pumped Tm:SSO laser near 2 mu m 
作者: Liu, J (Liu, J.); Li, YQ (Li, Y. Q.); Zheng, LH (Zheng, L. H.); Su, LB (Su, L. B.); Xu, J (Xu, J.); Wang, YG (Wang, Y. G.)
来源出版物: LASER PHYSICS LETTERS  卷: 10  期: 10  文献号: 105812  DOI: 10.1088/1612-2011/10/10/105812  出版年: OCT 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: With a fiber-coupled 790 nm laser diode array as the pump source and a 4 at.% Tm:Sc2SiO5 (Tm:SSO) crystal, laser action near 2 mu m wavelength was successfully obtained with a compact four-mirror fold cavity. Using broadband carbon nanotube as the saturable absorber, a passively Q-switched mode-locked (QML) Tm: SSO laser is realized for the first time. 100% modulation depth of mode locking has been achieved. The duration of the mode-locked pulse is estimated to be about sub-100 ps with 92.6 MHz repetition rate within a Q-switched pulse envelope. The spectrum of the QML laser is centered at 1967.4 nm with a broad spectral region of similar to 23 nm. A maximum average output power of 195 mW and Q-switched pulse energy of 4.7 mu J is obtained. The dependence of the operational parameters on pump power was also investigated experimentally.
文献类型: Article
KeyWords Plus: CARBON NANOTUBE ABSORBER; SATURABLE ABSORBER; HIGH-POWER; SINGLE; PERFORMANCE; EFFICIENT; CRYSTAL; YB3+SC2SIO5
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 254IO 
ISSN: 1612-2011 
电子 ISSN: 1612-202X 


第 39 条,共 223 条
标题: Study on 2.0 mu m fluorescence of Ho-doped water-free fluorotellurite glasses 
作者: He, JL (He, Jianli); Zhan, H (Zhan, Huan); Zhou, ZG (Zhou, Zhiguang); Zhang, AD (Zhang, Aidong); Lin, AX (Lin, Aoxiang)
来源出版物: OPTICAL MATERIALS  卷: 35  期: 12  页: 2573-2576  DOI: 10.1016/j.optmat.2013.07.031  出版年: OCT 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: Ho(3+-)doped water-free fluorotellurite glasses with composition of 60TeO(2)-30ZnF(2)-10NaF (mol%, TZNF60) were made by using specially-designed physical and chemical dehydration technique. 2.04 mu m fluorescence (Ho3+: I-5(7) -> I-5(8)) was observed experimentally and presented in this paper: A broad bandwidth of similar to 149 nm, large simulated emission cross-section of 7.2 x 10(-21) cm(2), and the longest reported fluorescence lifetime of similar to 10 ms among all the reported Ho3+-doped oxide glasses. Thanks to the absence of OH groups and low phonon energy with the addition fluorides into tellurite oxide glasses, 1.00Ho-TZNF60 glass demonstrates the maximum figure of merit (sigma(em) x tau(f)) of 7.13 x 10(-27) m(2) s, thus regarded as a promising optical material for the development of 2.0 mu m fiber lasers. (C) 2013 Elsevier B.V. All rights reserved.
文献类型: Article
作者关键词: Fluorotellurite glasses; Holmium; Fiber materials
KeyWords Plus: SILICA FIBER LASER; M EMISSION; TELLURITE GLASS; ENERGY-TRANSFER; THERMAL LENS; TM3+; YB3+
Web of Science 类别: Materials Science, Multidisciplinary; Optics
研究方向: Materials Science; Optics
IDS 号: 247YI 
ISSN: 0925-3467 
电子 ISSN: 1873-1252 


第 40 条,共 223 条
标题: Spectroscopic and laser-induced damage properties of Fe2+-doped fluorophosphate glass, a new color-separation material 
作者: Fu, LL (Fu, Lili); Ren, WY (Ren, Wenyi); Liu, CX (Liu, Chunxiao); Xu, SN (Xu, Shennuo); Zheng, RL (Zheng, Ruilin); Wei, W (Wei, Wei); Zhang, CM (Zhang, Chunmin); Peng, B (Peng, Bo)
来源出版物: APPLIED PHYSICS B-LASERS AND OPTICS  卷: 113  期: 1  页: 81-86  DOI: 10.1007/s00340-013-5652-6  出版年: OCT 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: Fe2+-doped fluorophosphate glass (FEFG), a new color-separation material, is prepared by a melt-quenching method. The spectroscopic and laser-induced damage (LID) properties of FEFG are investigated by transmittance spectroscopy, LID tests, scanning electron microscopy, and Raman spectroscopy. Results show that the sample has intensive absorption (> 85 %) at 1,053 nm and high transmittance (similar to 86.5 %) at 351 nm after introducing 0.3 wt% Fe2O3. The LID thresholds of 0.3 wt% Fe2O3-doped FEFG sample irradiated by 351- and 1,053-nm lasers with 8 ns pulse width are 4.5 and 36.0 J/cm(2), respectively. Thus, FEFG has laser-separation ability and can resist nanosecond laser irradiation, indicating that FEFG is a potential color-separation material for high-power lasers.
文献类型: Article
KeyWords Plus: FUSED-SILICA; DESIGN; BREAKDOWN; GRATINGS
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 247EL 
ISSN: 0946-2171 
电子 ISSN: 1432-0649 


第 41 条,共 223 条
标题: Terahertz Spectroscopy of DNA Nucleobases : Cytosine and Thymine 
作者: Yan, H (Yan Hui); Fan, WH (Fan Wen-hui); Zheng, ZP (Zheng Zhuan-ping); Liu, J (Liu Jia)
来源出版物: SPECTROSCOPY AND SPECTRAL ANALYSIS  卷: 33  期: 10  页: 2612-2616  DOI: 10.3964/j.issn.1000-0593(2013)10-2612-05  出版年: OCT 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: The absorption features of DNA nucleobases cytosine and thymine were measured by terahertz time-domain spectroscopy (THz-TDS) from 0.1 to 3.5 THz. Our experimental results clearly show that these important biomolecules exhibit distinctive absorption features in THz region. To the best of our knowledge, the subtle absorption peak of cytosine at 2.53 THz is reported for the first time. Moreover, geometry optimizations and lattice dynamic calculations on cytosine crystal were also performed with the pseudo-potential plane wave method of density functional theory by taking periodic boundary conditions into account. All measured terahertz absorption features of cytosine were assigned successfully and its absorption spectrum was reproduced according to our calculations. Furthermore, our results show that absorption features of cytosine below 3.5 THz arise from external modes in translation and rotation motions, which are dominated by the intermolecular hydrogen bonds.
文献类型: Article
作者关键词: THz-TDS; Cytosine; Thymine; Theoretical calculation
KeyWords Plus: VIBRATIONAL-MODES; CRYSTAL STRUCTURE
Web of Science 类别: Spectroscopy
研究方向: Spectroscopy
IDS 号: 241WL 
ISSN: 1000-0593 


第 42 条,共 223 条
标题: Single Image Super-Resolution With Multiscale Similarity Learning 
作者: Zhang, KB (Zhang, Kaibing); Gao, XB (Gao, Xinbo); Tao, DC (Tao, Dacheng); Li, XL (Li, Xuelong)
来源出版物: IEEE TRANSACTIONS ON NEURAL NETWORKS AND LEARNING SYSTEMS  卷: 24  期: 10  页: 1648-1659  DOI: 10.1109/TNNLS.2013.2262001  出版年: OCT 2013  
Web of Science 核心合集中的 "被引频次": 4 
被引频次合计: 5 
摘要: Example learning-based image super-resolution (SR) is recognized as an effective way to produce a high-resolution (HR) image with the help of an external training set. The effectiveness of learning-based SR methods, however, depends highly upon the consistency between the supporting training set and low-resolution (LR) images to be handled. To reduce the adverse effect brought by incompatible high-frequency details in the training set, we propose a single image SR approach by learning multiscale self-similarities from an LR image itself. The proposed SR approach is based upon an observation that small patches in natural images tend to redundantly repeat themselves many times both within the same scale and across different scales. To synthesize the missing details, we establish the HR-LR patch pairs using the initial LR input and its down-sampled version to capture the similarities across different scales and utilize the neighbor embedding algorithm to estimate the relationship between the LR and HR image pairs. To fully exploit the similarities across various scales inside the input LR image, we accumulate the previous resultant images as training examples for the subsequent reconstruction processes and adopt a gradual magnification scheme to upscale the LR input to the desired size step by step. In addition, to preserve sharper edges and suppress aliasing artifacts, we further apply the nonlocal means method to learn the similarity within the same scale and formulate a nonlocal prior regularization term to well pose SR estimation under a reconstruction-based SR framework. Experimental results demonstrate that the proposed method can produce compelling SR recovery both quantitatively and perceptually in comparison with other state-of-the-art baselines.
PubMed ID: 24808601 
文献类型: Article
作者关键词: Image super-resolution (SR); multiscale self-similarities; neighbor embedding (NE); nonlocal means (NLM)
KeyWords Plus: QUALITY ASSESSMENT; KERNEL REGRESSION; NONLOCAL-MEANS; INTERPOLATION; ALGORITHM; REGULARIZATION; RESTORATION
Web of Science 类别: Computer Science, Artificial Intelligence; Computer Science, Hardware & Architecture; Computer Science, Theory & Methods; Engineering, Electrical & Electronic
研究方向: Computer Science; Engineering
IDS 号: 238WC 
ISSN: 2162-237X 
电子 ISSN: 2162-2388 


第 43 条,共 223 条
标题: Person Re-Identification by Regularized Smoothing KISS Metric Learning 
作者: Tao, DP (Tao, Dapeng); Jin, LW (Jin, Lianwen); Wang, YF (Wang, Yongfei); Yuan, Y (Yuan, Yuan); Li, XL (Li, Xuelong)
来源出版物: IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY  卷: 23  期: 10  页: 1675-1685  DOI: 10.1109/TCSVT.2013.2255413  出版年: OCT 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: With the rapid development of the intelligent video surveillance (IVS), person re-identification, which is a difficult yet unavoidable problem in video surveillance, has received increasing attention in recent years. That is because computer capacity has shown remarkable progress and the task of person re-identification plays a critical role in video surveillance systems. In short, person re-identification aims to find an individual again that has been observed over different cameras. It has been reported that KISS metric learning has obtained the state of the art performance for person re-identification on the VIPeR dataset [39]. However, given a small size training set, the estimation to the inverse of a covariance matrix is not stable and thus the resulting performance can be poor. In this paper, we present regularized smoothing KISS metric learning (RS-KISS) by seamlessly integrating smoothing and regularization techniques for robustly estimating covariance matrices. RS-KISS is superior to KISS, because RS-KISS can enlarge the underestimated small eigenvalues and can reduce the overestimated large eigenvalues of the estimated covariance matrix in an effective way. By providing additional data, we can obtain a more robust model by RS-KISS. However, retraining RS-KISS on all the available examples in a straightforward way is time consuming, so we introduce incremental learning to RS-KISS. We thoroughly conduct experiments on the VIPeR dataset and verify that 1) RS-KISS completely beats all available results for person re-identification and 2) incremental RS-KISS performs as well as RS-KISS but reduces the computational cost significantly.
文献类型: Article
作者关键词: Incremental learning; intelligent video surveillance; metric learning; person re-identification
KeyWords Plus: DISCRIMINANT-ANALYSIS; FACE RECOGNITION; FEATURES; CLASSIFICATION; REDUCTION; VARIABLES; ENSEMBLE; TRACKING; CAMERAS; SCALE
Web of Science 类别: Engineering, Electrical & Electronic
研究方向: Engineering
IDS 号: 234RR 
ISSN: 1051-8215 
电子 ISSN: 1558-2205 


第 44 条,共 223 条
标题: 1.23 mu m emission of Er/Pr-doped water-free fluorotellurite glasses 
作者: Zhan, H (Zhan, Huan); Zhang, AD (Zhang, Aidong); He, JL (He, Jianli); Zhou, ZG (Zhou, Zhiguang); Si, JH (Si, Jinhai); Lin, AX (Lin, Aoxiang)
来源出版物: APPLIED OPTICS  卷: 52  期: 28  页: 7002-7006  DOI: 10.1364/AO.52.007002  出版年: OCT 1 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: To investigate the relatively unexplored 1.2 mu m region, we identified a near-infrared emission at around 1.23 mu m from Er3+/Pr3+-codoped water-free fluorotellurite glass with a composition of 60TeO(2)-30ZnF(2)-10NaF (TZNF60, mol. %). Under the condition of pumping with the 488 nm optical parametric oscillator (OPO) laser system, the directly measured lifetime (tau(f)) at 1.23 mu m in Er/Pr-codoped fluorotellurite glasses is about 111.2 mu s, much longer than that of Er-doped fluorotellurite glass (80.1 mu s). The stimulated emission cross section (sigma(em)) and quantum efficiency (eta) for Er3+:S-4(3/2) -> I-4(11/2) transition are greatly enhanced when appropriate Pr3+ ions are incorporated. These advances arise partially from the absence of the hydroxyl (OH) group and low phonon energy with the addition of a large amount of fluorides into oxide-based host glasses. With high quantum efficiency (56.2%) and a large stimulated cross section (4.03 x 10(-21) cm(2)), Er3+/Pr3+-codoped TZNF60 glass is regarded as promising material for the development of optical amplification and laser operation at the relatively unexplored 1.2 mu m region. (C) 2013 Optical Society of America
PubMed ID: 24085215 
文献类型: Article
KeyWords Plus: TELLURITE GLASSES; OPTICAL COMMUNICATION; INFRARED-EMISSION; FIBER AMPLIFIERS; HIGH-POWER; LASER; TRANSITIONS; IONS
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 228UO 
ISSN: 1559-128X 


第 45 条,共 223 条
标题: Manipulation of light in MIM plasmonic waveguide systems 
作者: Lu, H (Lu Hua); Wang, GX (Wang GuoXi); Liu, XM (Liu XueMing)
来源出版物: CHINESE SCIENCE BULLETIN  卷: 58  期: 30  页: 3607-3616  DOI: 10.1007/s11434-013-5989-6  出版年: OCT 2013  
Web of Science 核心合集中的 "被引频次": 2 
被引频次合计: 2 
摘要: Plasmonic waveguides that allow deeply subwavelength confinement of light provide an effective platform for the design of ultra-compact photonic devices. As an important plasmonic waveguide, metal-insulator-metal (MIM) structure supports the propagation of light in the nanoscale regime at the visible and near-infrared ranges. Here, we focus on our work in MIM plasmonic waveguide devices for manipulating light, and review some of the recent development of this topic. We introduce MIM plasmonic wavelength filtering and demultiplexing devices, and present the electromagnetic induced transparency (EIT)-like and Fano resonance effects in MIM waveguide systems. The slow-light and rainbow trapping effects are demonstrated theoretically. These results pave a way toward dynamic control of the special and useful optical responses, which actualize some new plasmonic waveguide-integrated devices such as nanoscale filters, demultiplexers, sensors, slow light waveguides, and buffers.
文献类型: Review
作者关键词: surface plasmons; coupled resonators; optical filters; wavelength demultiplexers; slow light; rainbow trapping
KeyWords Plus: ELECTROMAGNETICALLY INDUCED TRANSPARENCY; SLOW-LIGHT; OPTICAL BISTABILITY; SURFACE-PLASMONS; POLARITON PROPAGATION; NANODISK RESONATORS; COUPLED RESONATORS; BRAGG REFLECTORS; RING RESONATORS; FANO RESONANCES
Web of Science 类别: Multidisciplinary Sciences
研究方向: Science & Technology - Other Topics
IDS 号: 227PT 
ISSN: 1001-6538 


第 46 条,共 223 条
标题: Spectroscopic properties and Judd-Ofelt analysis of Dy3+-doped and Dy3+, Tm3+-codped Ge-In-S chalcogenide glasses 
作者: Guo, HT (Guo, Haitao); Xu, YT (Xu, Yantao); Chen, HY (Chen, Hongyan); Cui, XX (Cui, Xiaoxia); Qiao, ZB (Qiao, Zebang); Gu, SX (Gu, Shaoxuan); Hou, CQ (Hou, Chaoqi); Meng, W (Meng, Wei); Lu, CF (Lu, Chunfeng); Peng, B (Peng, Bo)
来源出版物: JOURNAL OF NON-CRYSTALLINE SOLIDS  卷: 377  特刊: SI  页: 95-99  DOI: 10.1016/j.jnoncrysol.2013.01.013  出版年: OCT 1 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: 0.2 wt.% Dy3+-doped and 0.2 wt.% Dy3+, 0.5 wt.% Tm3+-codoped (100-x)GeS2 center dot xIn(2)S(3) (x = 5,10,15,20,25) chalcogenide glasses were prepared. Their spectroscopic properties were analyzed based on absorption (ranges from 500 to 3000 nm) and emission (ranges from 1000 to 4700 nm) measurements. The Judd-Ofelt strength parameters Omega(t) (t = 2, 4, 6) and the spectroscopy parameters A(rad), beta and T-rad were calculated, and the sigma(emi) of the 1330, 2930 and 4320 nm fluorescences were estimated. These Dy3+-doped and Dy3+, Tm3+-codoped Ge-In-S chalcogenide glasses are valuable materials for using in 1.3 mu m fiber-amplifiers and 2-5 mu m mid-infrared laser devices. (C) 2013 Elsevier B.V. All rights reserved.
文献类型: Article; Proceedings Paper
会议名称: 18th International Symposium on Non-Oxide and New Optical Glasses 
会议日期: JUL 01-05, 2012 
会议地点: Saint Malo, FRANCE 
作者关键词: Chalcogenide glass; Rare-earth ions; Spectroscopy; Mid-infrared; Judd-Ofelt
KeyWords Plus: CHALCOHALIDE GLASSES; OPTICAL NONLINEARITY; THERMAL-PROPERTIES; SYSTEM; 3RD-ORDER
Web of Science 类别: Materials Science, Ceramics; Materials Science, Multidisciplinary
研究方向: Materials Science
IDS 号: 229YW 
ISSN: 0022-3093 


第 47 条,共 223 条
标题: Low repetition rate subnanosecond pulse laser generation from a diode pumped Nd:Lu3Al5O12 laser with electro-optic modulator and transmission semiconductor saturable absorber 
作者: Chang, L (Chang, L.); Zhao, SZ (Zhao, S. Z.); Yang, KJ (Yang, K. J.); Zhao, J (Zhao, J.); Zheng, LH (Zheng, L. H.); Xu, XD (Xu, X. D.); Di, JQ (Di, J. Q.); Xu, J (Xu, J.); Wang, YG (Wang, Y. G.)
来源出版物: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS  卷: 30  期: 10  页: 2710-2714  DOI: 10.1364/JOSAB.30.002710  出版年: OCT 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: By using the dual-loss modulated technology, i.e., adopting the electro-optic (EO) modulator and transmission semiconductor saturable absorber (transmission SSA) simultaneously, a diode-pumped doubly Q-switched and mode-locked (QML) Nd:Lu3Al5O12 (Nd: LuAG) laser at 1.06 mu m has been realized for the first time. In comparison to the singly passively QML Nd: LuAG laser with transmission SSA, the doubly QML laser can generate more stable pulses with shorter pulse widths and higher peak powers. It can also be observed that the pulse duration of the Q-switched envelope decreases with increasing pump power. When the pump power exceeds 6.52 W for the first time, there is only one mode-locked pulse underneath a Q-switched envelope for this doubly QML Nd: LuAG laser. As a result, the subnanosecond pulse laser with 1 kHz repetition rate of EO and high stability can be generated. The shortest pulse duration generated is about 718 ps and the highest peak power reaches as high as 502 kW. The experimental results show that Nd: LuAG is an excellent alternative crystal for diode-pumped QML pulsed laser generation. (C) 2013 Optical Society of America
文献类型: Article
KeyWords Plus: ND-YVO4 LASER; 1064 NM; OSCILLATOR; OPERATION; CRYSTAL; SYSTEM; GROWTH; VYAG; WAVE
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 228UC 
ISSN: 0740-3224 


第 48 条,共 223 条
标题: Investigation and control of ultrafast laser-induced isotropic and anisotropic nanoscale-modulated index patterns in bulk fused silica 
作者: Stoian, R (Stoian, R.); Mishchik, K (Mishchik, K.); Cheng, G (Cheng, G.); Mauclair, C (Mauclair, C.); D'Amico, C (D'Amico, C.); Colombier, JP (Colombier, J. P.); Zamfirescu, M (Zamfirescu, M.)
来源出版物: OPTICAL MATERIALS EXPRESS  卷: 3  期: 10  页: 1755-1768  DOI: 10.1364/OME.3.001755  出版年: OCT 1 2013  
Web of Science 核心合集中的 "被引频次": 3 
被引频次合计: 3 
摘要: Ultrafast laser-induced refractive index changes in a-SiO2 consist, depending on the irradiation conditions, of either positive variations, voids, or regular nanoscale patterns, each of these underlying specific structural transformations. These allow for obtaining a large palette of optical functions ranging from low loss guiding to anisotropic scattering. While briefly reviewing the excitation mechanisms, we spectroscopically interrogate local electronic and structural transformations of the glass in the isotropic index zones and in the regular self-organized nanostructures, indicating bond breaking and matrix oxygen deficiency. A spatial defect segregation marks the material transformation in the different photoinscription regimes. We equally propose a method of real time control of nanogratings formation under the action of ultrashort laser pulse with variable envelopes. Application as polarizing optical devices is discussed. (C) 2013 Optical Society of America
文献类型: Article
KeyWords Plus: FEMTOSECOND LASER; TRANSPARENT MATERIALS; WAVE-GUIDES; POLARIZATION FUNCTIONS; PULSES; GLASS; PHOTOINSCRIPTION; FILAMENTATION; IRRADIATION; DEVICES
Web of Science 类别: Materials Science, Multidisciplinary; Optics
研究方向: Materials Science; Optics
IDS 号: 228RT 
ISSN: 2159-3930 


第 49 条,共 223 条
标题: Wide-Range Continuously-Tunable Slow-Light Delay Line Based on Stimulated Brillouin Scattering 
作者: Ju, HJ (Ju, Haijuan); Ren, LY (Ren, Liyong); Lin, X (Lin, Xiao); Liang, J (Liang, Jian); Ma, CJ (Ma, Chengju)
来源出版物: IEEE PHOTONICS TECHNOLOGY LETTERS  卷: 25  期: 19  页: 1920-1923  DOI: 10.1109/LPT.2013.2278536  出版年: OCT 1 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: Through selectively controlling the stimulated Brillouin scattering in optical fibers with different lengths, a continuously tunable time-delay scheme enabling to work in a large range is proposed in this letter. This is realized by connecting a fixed long single-mode fiber (SMF) to one of the several selectable short SMFs that successively have an equal increment in length. These short-length fibers are, respectively, fixed to the different channels between two identical optical switches. Therefore, a wide-range and continuously tunable slow-light delay line can be constructed by changing the power of the pump beam, assisted by switching to different channels. In the experiment, a time delay from 0 to 201.29 ns is demonstrated for a five-channel configuration. A further large-range time delay can be expected if one adds the number of channels accordingly.
文献类型: Article
作者关键词: Slow light; optical delay line; stimulated Brillouin scattering (SBS); optical fibers
KeyWords Plus: TRUE-TIME-DELAY; PHASED-ARRAY ANTENNAS; OPTICAL-FIBERS; BUFFERS
Web of Science 类别: Engineering, Electrical & Electronic; Optics; Physics, Applied
研究方向: Engineering; Optics; Physics
IDS 号: 222XQ 
ISSN: 1041-1135 
电子 ISSN: 1941-0174 


第 50 条,共 223 条
标题: Rank Preserving Sparse Learning for Kinect Based Scene Classification 
作者: Tao, DP (Tao, Dapeng); Jin, LW (Jin, Lianwen); Yang, Z (Yang, Zhao); Li, XL (Li, Xuelong)
来源出版物: IEEE TRANSACTIONS ON CYBERNETICS  卷: 43  期: 5  特刊: SI  页: 1406-1417  DOI: 10.1109/TCYB.2013.2264285  出版年: OCT 2013  
Web of Science 核心合集中的 "被引频次": 4 
被引频次合计: 4 
摘要: With the rapid development of the RGB-D sensors and the promptly growing population of the low-cost Microsoft Kinect sensor, scene classification, which is a hard, yet important, problem in computer vision, has gained a resurgence of interest recently. That is because the depth of information provided by the Kinect sensor opens an effective and innovative way for scene classification. In this paper, we propose a new scheme for scene classification, which applies locality-constrained linear coding (LLC) to local SIFT features for representing the RGB-D samples and classifies scenes through the cooperation between a new rank preserving sparse learning (RPSL) based dimension reduction and a simple classification method. RPSL considers four aspects: 1) it preserves the rank order information of the within-class samples in a local patch; 2) it maximizes the margin between the between-class samples on the local patch; 3) the L1-norm penalty is introduced to obtain the parsimony property; and 4) it models the classification error minimization by utilizing the least-squares error minimization. Experiments are conducted on the NYU Depth V1 dataset and demonstrate the robustness and effectiveness of RPSL for scene classification.
PubMed ID: 23846511 
文献类型: Article
作者关键词: Dimension reduction; Kinect sensor; rank preserving and sparse learning; RGB-D sensor; scene classification
KeyWords Plus: NONLINEAR DIMENSIONALITY REDUCTION; TEXTURE CLASSIFICATION; FACE RECOGNITION; FEATURES; REPRESENTATION; SEGMENTATION; SELECTION; MANIFOLD; SCALE; SHAPE
Web of Science 类别: Computer Science, Artificial Intelligence; Computer Science, Cybernetics
研究方向: Computer Science
IDS 号: 220LY 
ISSN: 2168-2267 


 
IDS 号: 223IO 
ISSN: 1559-128X 
电子 ISSN: 2155-3165 


第 55 条,共 223 条
标题: A novel gain medium: Micro-sphere array cooled by refractive index-matched coolant 
作者: Gui, L (Gui, Luo); Ding, JY (Ding, Jianyong); She, JB (She, Jiangbo); Peng, B (Peng, Bo); Wei, W (Wei, Wei); Fan, DY (Fan, Dianyuan)
来源出版物: OPTICS COMMUNICATIONS  卷: 305  页: 91-95  DOI: 10.1016/j.optcom.2013.04.072  出版年: SEP 15 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: A micro-sphere array laser gain medium cooled by refractive index-matched coolant was demonstrated for the first time to our knowledge. The new concept is possessed of potential to improve thermal management, to increase the thermal load capacity and to build large scale laser medium with small-sized solid laser materials. The feasibility was experimentally proved with an oscillator experiment in which reliable laser output was observed: the maximum output was 113.3 mJ for the pump energy of 765.8 mJ, the threshold was 131.7 mJ and the slope efficiency was 19%. Promising improvement could be achieved by employing methods for maintaining accurate refractive index matching during the lasing process. (C) 2013 Published by Elsevier B.V.
文献类型: Article
作者关键词: Gain medium; Thermal management; Thermal load capacity; Refractive index; Micro-sphere; High power laser
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 273HC 
ISSN: 0030-4018 
电子 ISSN: 1873-0310 


第 56 条,共 223 条
标题: Enhanced luminescence properties of monodisperse trioctylphosphine oxide-capped Nd3+-doped LaF3 nanorods without OH groups 
作者: Cui, XX (Cui, Xiaoxia); Guo, HT (Guo, Haitao); Hou, CQ (Hou, Chaoqi); Gao, F (Gao, Fei); Wang, ZY (Wang, Zhongyue); Wei, W (Wei, Wei); Peng, B (Peng, Bo)
来源出版物: COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS  卷: 436  页: 386-391  DOI: 10.1016/j.colsurfa.2013.07.009  出版年: SEP 5 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: Nd3+-doped LaF3 nanorods without -OH groups were synthesized via a simple thermolysis method in trioctylphosphine oxide (TOPO) solvent. FTIR spectrum indicates that TOPO molecules have been coordinated to LaF3:Nd nanorods surface, which reduce the number of -OH groups on the nanoparticles surface effectively. The structure and morphology of as-synthesized nanorods were characterized. The possible grow mechanism of LaF3:Nd nanorods has been also discussed in detail. The TOPO capped LaF3:Nd nanoparticles preferentially grow along the <0 0 0 1> orientation under high temperature. Based on the absorption spectra and Judd-Ofelt theory, higher value of emission cross-section for F-4(3/2)-> I-4(11/2) transition of Nd3+ was calculated to be 3.22 x 10(-20) cm(2). The strong fluorescence intensity of LaF3:Nd nanorods in chloroform demonstrates that these nanorods are promising luminescence materials. (C) 2013 Elsevier B.V. All rights reserved.
文献类型: Article
作者关键词: LaF3:Nd nanorods; Thermolysis method; TOPO; Surface modification
KeyWords Plus: RARE-EARTH FLUORIDE; CDSE NANOCRYSTALS; NANOPARTICLES; FLUORESCENCE; COMPLEX; IONS
Web of Science 类别: Chemistry, Physical
研究方向: Chemistry
IDS 号: 244UY 
ISSN: 0927-7757 
电子 ISSN: 1873-4359 


第 57 条,共 223 条
标题: Photonic bandgap via nonlinear modulation assisted by spontaneously generated coherence 
作者: Yao, YP (Yao, Yin-Ping); Zhang, TY (Zhang, Tong-Yi); Kou, J (Kou, Jun); Wan, RG (Wan, Ren-Gang)
来源出版物: PHYSICS LETTERS A  卷: 377  期: 21-22  页: 1416-1420  DOI: 10.1016/j.physleta.2013.04.013  出版年: SEP 2 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: A four-level double-ladder atomic system with two upper states coupled to the excited state by a standing-wave trigger field is explored to generate photonic bandgap (PBG) structure. With the assistance of spontaneously generated coherence (SGC) from the two decay pathways, we can obtain single or double fully developed PBG when the trigger field is far away from resonance or resonant. While in the absence of SGC, the atomic medium becomes strong absorptive to the probe field, and therefore the resulting PBGs are severely malformed or even cannot be opened up. Numerical results show that the PBG structure is originated from the third-order cross Kerr nonlinear modulation between the probe and trigger fields. This mechanism differs from the recent schemes based on linear modulation. (c) 2013 Elsevier B.V. All rights reserved.
文献类型: Article
作者关键词: Spontaneously generated coherence; Photonic bandgap; Nonlinear modulation
KeyWords Plus: ELECTROMAGNETICALLY INDUCED TRANSPARENCY; SPONTANEOUS EMISSION CANCELLATION; QUANTUM INTERFERENCE; BROADENED RESONANCES; ATOMIC MEDIUM; COLD ATOMS; LIGHT; INVERSION; SYSTEM
Web of Science 类别: Physics, Multidisciplinary
研究方向: Physics
IDS 号: 146JU 
ISSN: 0375-9601 


第 58 条,共 223 条
标题: A diode-pumped passively Q-switched Tm,Ho:YAP laser with a single-walled carbon nanotube 
作者: Feng, TL (Feng, T. L.); Zhao, SZ (Zhao, S. Z.); Yang, KJ (Yang, K. J.); Li, GQ (Li, G. Q.); Li, DC (Li, D. C.); Zhao, J (Zhao, J.); Qiao, WC (Qiao, W. C.); Zheng, LH (Zheng, L. H.); Xu, J (Xu, J.); Zhao, GJ (Zhao, G. J.); Wang, YG (Wang, Y. G.)
来源出版物: LASER PHYSICS LETTERS  卷: 10  期: 9  文献号: 095001  DOI: 10.1088/1612-2011/10/9/095001  出版年: SEP 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: In this letter we present diode-pumped continuous wave (CW) and passively Q-switched a-cut and b-cut Tm,Ho: YAP lasers with a single-walled carbon nanotube saturable absorber (SWCNT-SA). In the CW regime, a maximum output power of 1.61 W at 2118.3 nm corresponding to a slope efficiency of 33.7% and a maximum output power of 1.23 W with a slope efficiency of 28.7% at 2129.6 nm were achieved from the a-and b-cut Tm, Ho: YAP lasers, respectively. With a SWCNT employed as the saturable absorber, passively Q-switched a-and b-cut Tm, Ho: YAP lasers were both realized. The a-cut Tm, Ho: YAP laser generated a 245 ns pulse at 2128.3 nm with a repetition rate of 400 kHz, while the b-cut Tm, Ho: YAP laser produced a 135 ns pulse at 2130 nm with a repetition rate of 245 kHz.
文献类型: Article
KeyWords Plus: 2 MU-M; SATURABLE ABSORBER; MODE-LOCKING; FREQUENCY OUTPUT; ROOM-TEMPERATURE; CONTINUOUS-WAVE; DOPED GLASS; TM; OPERATION; PERFORMANCE
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 254CL 
ISSN: 1612-2011 
电子 ISSN: 1612-202X 


第 59 条,共 223 条
标题: Bound dissipative-pulse evolution in the all-normal dispersion fiber laser using a 45 degrees tilted fiber grating 
作者: Liu, XL (Liu, Xianglian); Wang, HS (Wang, Hushan); Wang, YS (Wang, Yishan); Zhao, W (Zhao, Wei); Zhang, W (Zhang, Wei); Tan, XF (Tan, Xuefei); Yang, Z (Yang, Zhi); Shen, DY (Shen, Deyuan); Li, C (Li, Cheng); Yan, ZJ (Yan, Zhijun); Zhang, L (Zhang, Lin); Chen, GD (Chen, Guangde)
来源出版物: LASER PHYSICS LETTERS  卷: 10  期: 9  文献号: 095103  DOI: 10.1088/1612-2011/10/9/095103  出版年: SEP 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: The formation and evolution of bound dissipative pulses in the all-normal dispersion Yb-fiber laser based on a novel 45 degrees tilted fiber grating (TFG) are first investigated both numerically and experimentally. Based on the nonlinear polarization rotation technique, the TFG and two polarization controllers (PCs) are exploited for stable self-started passive mode locking. Numerical results show that the formation of bound-state pulses in the all-normal dispersion region is the progress of soliton shaping through the dispersive waves and follows the soliton energy quantization effect. Theoretical and experimental results demonstrate that the formation mechanism of bound-state pulses can be attributed to the high pump strength and effective filter bandwidth. The obtained bound-state dissipative pulses with quasi-rectangular spectral profile have fixed pulse separation as a function of pump power.
文献类型: Article
KeyWords Plus: GAIN-GUIDED SOLITONS; ZERO DISPERSION; GENERATION; GRAPHENE; REGIME; CAVITY; STATES
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 254CL 
ISSN: 1612-2011 
电子 ISSN: 1612-202X 


第 60 条,共 223 条
标题: A synthetic aperture telescope based on a pair of gratings 
作者: Ji, K (Ji, Ke); Gao, P (Gao, Peng); Min, JW (Min, Junwei); Guo, RL (Guo, Rongli); Menke, N (Menke, Neimule)
来源出版物: JOURNAL OF MODERN OPTICS  卷: 60  期: 15  页: 1229-1233  DOI: 10.1080/09500340.2013.832428  出版年: SEP 1 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: A synthetic aperture is an effective approach to enhancement of the resolution of telescopes. In this paper, a new method to improve the resolution by using a pair of gratings is proposed. It allows collection of parts of the light diffracted from the object which could not previously reach the imaging device. This method improves the resolution and light energy utilization ratio of telescopes without introducing new chromatic aberration. An experiment for resolution testing was carried out and the feasibility and availability of the method were verified.
文献类型: Article
作者关键词: synthetic aperture; grating; resolution; telescope
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 249PD 
ISSN: 0950-0340 
电子 ISSN: 1362-3044 


第 61 条,共 223 条
标题: A 1319 nm diode-side-pumped Nd:YAG laser Q-switched with graphene oxide 
作者: Zhang, L (Zhang, Ling); Yu, HJ (Yu, Haijuan); Yan, SL (Yan, Shilian); Zhao, WF (Zhao, Weifang); Sun, W (Sun, Wei); Yang, YY (Yang, Yingying); Wang, LR (Wang, Lirong); Hou, W (Hou, Wei); Lin, XC (Lin, Xuechun); Wang, YG (Wang, Yonggang); Wang, YS (Wang, Yishan)
来源出版物: JOURNAL OF MODERN OPTICS  卷: 60  期: 15  页: 1287-1289  DOI: 10.1080/09500340.2013.837975  出版年: SEP 1 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: We have demonstrated a diode-side-pumped Q-switched Nd:YAG laser operating at 1319nm with a saturable absorber of graphene oxide fabricated by the vertical evaporation method. The 1319nm Q-switched laser pulses were realized with average output power of 820 mW, pulse width of 2s and repetition rate of 35kHz. The pulse energy and peak power were 23.4J and 11.7W, respectively when the optical pump power was 232W. The experimental results indicate that graphene oxide is an effective saturable absorber for Q-switched lasers.
文献类型: Article
作者关键词: Q-switching; graphene oxide; 1319nm
KeyWords Plus: ND-YAG LASER; SATURABLE-ABSORBER; MU-M; PHOTONICS; NANOTUBE
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 249PD 
ISSN: 0950-0340 
电子 ISSN: 1362-3044 


第 62 条,共 223 条
标题: PROPERTIES OF WAVEGUIDE INDUCED BY DARK PHOTOVOLTAIC SOLITONS IN LiNbO3:Fe CRYSTAL 
作者: Zhang, MZ (Zhang, Meizhi); Huo, GW (Huo, Guangwen); Duan, ZL (Duan, Zuoliang); Hui, ZQ (Hui, Zhanqiang); Zeng, XM (Zeng, Xiangmei)
来源出版物: JOURNAL OF NONLINEAR OPTICAL PHYSICS & MATERIALS  卷: 22  期: 3  文献号: 1350032  DOI: 10.1142/S021886351350032X  出版年: SEP 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: We investigate waveguides induced by dark photovoltaic solitons without background beam theoretically and experimentally in LiNbO3 crystal. Based on sole charge carrier band-transport model, we numerically simulate the transmission equation with shooting method, and find it single mode. Furthermore, we utilize two probe beams detecting the waveguide in experiments: one is continuous with wavelength of 632.8 nm; the other is femtosecond pulse of 800 nm. Comparing the two set of results, we conclude that the waveguides have basic mode only, while the femto-second pulse is more stable. Due to aforementioned stability of waveguide for femto-second pulse, it indicates the possibility of low power continuous beam controlling the high power laser pulse.
文献类型: Article
作者关键词: Photorefractive effect; solitons; waveguides; femtosecond pulse
KeyWords Plus: PHOTOREFRACTIVE SCREENING SOLITONS; SPATIAL SOLITONS; BRIGHT; NONLINEARITY; MEDIA
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 243VW 
ISSN: 0218-8635 
电子 ISSN: 1793-6624 


第 63 条,共 223 条
标题: Transductive Face Sketch-Photo Synthesis 
作者: Wang, NN (Wang, Nannan); Tao, DC (Tao, Dacheng); Gao, XB (Gao, Xinbo); Li, XL (Li, Xuelong); Li, J (Li, Jie)
来源出版物: IEEE TRANSACTIONS ON NEURAL NETWORKS AND LEARNING SYSTEMS  卷: 24  期: 9  页: 1364-1376  DOI: 10.1109/TNNLS.2013.2258174  出版年: SEP 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: Face sketch-photo synthesis plays a critical role in many applications, such as law enforcement and digital entertainment. Recently, many face sketch-photo synthesis methods have been proposed under the framework of inductive learning, and these have obtained promising performance. However, these inductive learning-based face sketch-photo synthesis methods may result in high losses for test samples, because inductive learning minimizes the empirical loss for training samples. This paper presents a novel transductive face sketch-photo synthesis method that incorporates the given test samples into the learning process and optimizes the performance on these test samples. In particular, it defines a probabilistic model to optimize both the reconstruction fidelity of the input photo (sketch) and the synthesis fidelity of the target output sketch (photo), and efficiently optimizes this probabilistic model by alternating optimization. The proposed transductive method significantly reduces the expected high loss and improves the synthesis performance for test samples. Experimental results on the Chinese University of Hong Kong face sketch data set demonstrate the effectiveness of the proposed method by comparing it with representative inductive learning-based face sketch-photo synthesis methods.
PubMed ID: 24808574 
文献类型: Article
作者关键词: Probabilistic graph model; quadratic programming; sketch-photo synthesis; transductive learning
KeyWords Plus: SPARSE REPRESENTATION; RECOGNITION; IMAGE; RECONSTRUCTION; TRANSFORMATION; INFORMATION; ENSEMBLE
Web of Science 类别: Computer Science, Artificial Intelligence; Computer Science, Hardware & Architecture; Computer Science, Theory & Methods; Engineering, Electrical & Electronic
研究方向: Computer Science; Engineering
IDS 号: 238VY 
ISSN: 2162-237X 
电子 ISSN: 2162-2388 


第 64 条,共 223 条
标题: Two Approaches to Improve FPGA Performance for the Stereo Camera of the Chang'E-1 Satellite 
作者: Duan, YQ (Duan, Yongqiang); Wen, DS (Wen, Desheng); Gao, W (Gao, Wei); Zhao, BC (Zhao, Baochang)
来源出版物: IEEE AEROSPACE AND ELECTRONIC SYSTEMS MAGAZINE  卷: 28  期: 9  页: 16-29  出版年: SEP 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
文献类型: Article
KeyWords Plus: SPACE APPLICATIONS
Web of Science 类别: Engineering, Aerospace; Engineering, Electrical & Electronic
研究方向: Engineering
IDS 号: 234PQ 
ISSN: 0885-8985 
电子 ISSN: 1557-959X 


第 65 条,共 223 条
标题: Multiple frequency bands of square split resonant rings and metal wire metamaterial 
作者: Gao, P (Gao, Peng); Zhang, CM (Zhang, Chunmin); Ai, JJ (Ai, Jingjing); Kang, YQ (Kang, Yongqiang); Li, G (Li, Gang)
来源出版物: APPLIED OPTICS  卷: 52  期: 25  页: 6309-6315  DOI: 10.1364/AO.52.006309  出版年: SEP 1 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: This work presents experimental measurements of two square split resonant ring and metal wire (SSRR-MW) samples with different cell sizes at microwave frequencies. The geometrical sizes of the metamaterial cells are found to play an important role in the resonant frequency. Cells with different geometrical sizes are chosen to stack into a two-layer or three-layer metamaterial unit to realize the multiple negative passbands. The effective parameters of three separate SSRR-MW models (a one-layer unit, a two-layer unit, and a three-layer unit) are retrieved from the simulation data. The composed models exhibit two or three negative bands by overlapping the passbands of original cells and broadening the overall bandwidth. The recovered parameters show good agreement with the theoretical analysis. (C) 2013 Optical Society of America
PubMed ID: 24085092 
文献类型: Article
KeyWords Plus: NEGATIVE INDEX; PERMITTIVITY; PERMEABILITY; PARAMETERS; REFRACTION; PATTERNS
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 211CM 
ISSN: 1559-128X 


第 66 条,共 223 条
标题: Kinetics of polarization gratings assisted with polarized violet light in bacteriorhodopsin films 
作者: Yu, XH (Yu, Xianghua); Gao, P (Gao, Peng); Yao, BL (Yao, Baoli); Lei, M (Lei, Ming); Rupp, R (Rupp, Romano)
来源出版物: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION  卷: 30  期: 9  页: 1885-1891  DOI: 10.1364/JOSAA.30.001885  出版年: SEP 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: Polarization gratings can be recorded in bacteriorhodopsin films by an orthogonal pair of linearly or circularly polarized beams. If a linearly polarized auxiliary violet light is added during the grating formation, the grating becomes polarization-sensitive. A theoretical model based on the two-state photochromic theory is proposed to calculate the diffraction efficiency kinetics of these polarization gratings. In both cases, the additional linearly polarized auxiliary violet irradiation improves the steady-state diffraction efficiency and leads to a cosine modulation of the steady-state diffraction efficiency by the polarization orientation of the readout beam. Experiment results demonstrate the correctness of the theoretical model. (C) 2013 Optical Society of America
PubMed ID: 24323270 
文献类型: Article
KeyWords Plus: DIFFRACTION EFFICIENCY; HOLOGRAPHIC GRATINGS; PHOTOINDUCED ANISOTROPY; STORAGE
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 210FX 
ISSN: 1084-7529 


第 67 条,共 223 条
标题: A two-dimensional linear array fiber amplifier based on the MOPA configuration 
作者: Niu, LQ (Niu, L. Q.); Gao, CX (Gao, C. X.); He, HD (He, H. D.); Feng, L (Feng, L.); Cao, ZY (Cao, Z. Y.); Sun, CD (Sun, C. D.); Zhu, SL (Zhu, S. L.)
来源出版物: LASER PHYSICS  卷: 23  期: 9  文献号: 095103  DOI: 10.1088/1054-660X/23/9/095103  出版年: SEP 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: A two-dimensional linear array fiber amplifier based on the master oscillator power amplifier (MOPA) configuration is constructed and employed as the laser source of a high resolution 3D imaging LIDAR system. Each branch of the linear array system comprises a dual-stage Yb3+-doped large-mode-area double-clad fiber amplifier. The amplified pulse is of 2.3 ns temporal duration and 30 kHz repetition rate with an average power of 8.5 W when the pump power is 20 W. The optical-optical conversion efficiency is 41.8%. Furthermore, the SRS effect can be suppressed effectively. The M-2 values of the output beam are 1.35 and 1.33 in the x- and y-axis directions, respectively.
文献类型: Article
KeyWords Plus: HIGH-AVERAGE-POWER; REPETITION RATE; HIGH-ENERGY; LASER
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 203VV 
ISSN: 1054-660X 


第 68 条,共 223 条
标题: Fast and Accurate Matrix Completion via Truncated Nuclear Norm Regularization 
作者: Hu, Y (Hu, Yao); Zhang, DB (Zhang, Debing); Ye, JP (Ye, Jieping); Li, XL (Li, Xuelong); He, XF (He, Xiaofei)
来源出版物: IEEE TRANSACTIONS ON PATTERN ANALYSIS AND MACHINE INTELLIGENCE  卷: 35  期: 9  页: 2117-2130  DOI: 10.1109/TPAMI.2012.271  出版年: SEP 2013  
Web of Science 核心合集中的 "被引频次": 4 
被引频次合计: 4 
摘要: Recovering a large matrix from a small subset of its entries is a challenging problem arising in many real applications, such as image inpainting and recommender systems. Many existing approaches formulate this problem as a general low-rank matrix approximation problem. Since the rank operator is nonconvex and discontinuous, most of the recent theoretical studies use the nuclear norm as a convex relaxation. One major limitation of the existing approaches based on nuclear norm minimization is that all the singular values are simultaneously minimized, and thus the rank may not be well approximated in practice. In this paper, we propose to achieve a better approximation to the rank of matrix by truncated nuclear norm, which is given by the nuclear norm subtracted by the sum of the largest few singular values. In addition, we develop a novel matrix completion algorithm by minimizing the Truncated Nuclear Norm. We further develop three efficient iterative procedures, TNNR-ADMM, TNNR-APGL, and TNNR-ADMMAP, to solve the optimization problem. TNNR-ADMM utilizes the alternating direction method of multipliers (ADMM), while TNNR-AGPL applies the accelerated proximal gradient line search method (APGL) for the final optimization. For TNNR-ADMMAP, we make use of an adaptive penalty according to a novel update rule for ADMM to achieve a faster convergence rate. Our empirical study shows encouraging results of the proposed algorithms in comparison to the state-of-the-art matrix completion algorithms on both synthetic and real visual datasets.
PubMed ID: 23868774 
文献类型: Article
作者关键词: Matrix completion; nuclear norm minimization; alternating direction method of multipliers; accelerated proximal gradient method
KeyWords Plus: ALTERNATING DIRECTION METHOD; LOW-RANK; THRESHOLDING ALGORITHM; MINIMIZATION; ENTRIES
Web of Science 类别: Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic
研究方向: Computer Science; Engineering
IDS 号: 186GB 
ISSN: 0162-8828 


第 69 条,共 223 条
标题: Mean shift based gradient vector flow for image segmentation 
作者: Zhou, HY (Zhou, Huiyu); Li, XL (Li, Xuelong); Schaefer, G (Schaefer, Gerald); Celebi, ME (Celebi, M. Emre); Miller, P (Miller, Paul)
来源出版物: COMPUTER VISION AND IMAGE UNDERSTANDING  卷: 117  期: 9  页: 1004-1016  DOI: 10.1016/j.cviu.2012.11.015  出版年: SEP 2013  
Web of Science 核心合集中的 "被引频次": 5 
被引频次合计: 6 
摘要: In recent years, gradient vector flow (GVF) based algorithms have been successfully used to segment a variety of 2-D and 3-D imagery. However, due to the compromise of internal and external energy forces within the resulting partial differential equations, these methods may lead to biased segmentation results. In this paper, we propose MSGVF, a mean shift based GVF segmentation algorithm that can successfully locate the correct borders. MSGVF is developed so that when the contour reaches equilibrium, the various forces resulting from the different energy terms are balanced. In addition, the smoothness constraint of image pixels is kept so that over- or under-segmentation can be reduced. Experimental results on publicly accessible datasets of dermoscopic and optic disc images demonstrate that the proposed method effectively detects the borders of the objects of interest. (C) 2013 Elsevier Inc. All rights reserved.
文献类型: Article
作者关键词: Image segmentation; Mean shift; Gradient vector flow; Contour; Energy function
KeyWords Plus: ACTIVE CONTOUR MODELS; LEVEL SET METHOD; PATTERN-RECOGNITION; SNAKES; SHAPE; BOUNDARY; TRACKING; BALLOONS
Web of Science 类别: Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic
研究方向: Computer Science; Engineering
IDS 号: 182EK 
ISSN: 1077-3142 


第 70 条,共 223 条
标题: Global structure constrained local shape prior estimation for medical image segmentation 
作者: Yan, PK (Yan, Pingkun); Zhang, WX (Zhang, Wuxia); Turkbey, B (Turkbey, Baris); Choyke, PL (Choyke, Peter L.); Li, XL (Li, Xuelong)
来源出版物: COMPUTER VISION AND IMAGE UNDERSTANDING  卷: 117  期: 9  页: 1017-1026  DOI: 10.1016/j.cviu.2013.03.006  出版年: SEP 2013  
Web of Science 核心合集中的 "被引频次": 2 
被引频次合计: 2 
摘要: Organ shape plays an important role in clinical diagnosis, surgical planning and treatment evaluation. Shape modeling is a critical factor affecting the performance of deformable model based segmentation methods for organ shape extraction. In most existing works, shape modeling is completed in the original shape space, with the presence of outliers. In addition, the specificity of the patient was not taken into account. This paper proposes a novel target-oriented shape prior model to deal with these two problems in a unified framework. The proposed method measures the intrinsic similarity between the target shape and the training shapes on an embedded manifold by manifold learning techniques. With this approach, shapes in the training set can be selected according to their intrinsic similarity to the target image. With more accurate shape guidance, an optimized search is performed by a deformable model to minimize an energy functional for image segmentation, which is efficiently achieved by using dynamic programming. Our method has been validated on 2D prostate localization and 3D prostate segmentation in MRI scans. Compared to other existing methods, our proposed method exhibits better performance in both studies. (C) 2013 Elsevier Inc. All rights reserved.
文献类型: Article
作者关键词: Target-oriented shape modeling; Manifold learning; Manifold assumption; Medical image segmentation
KeyWords Plus: DIMENSIONALITY REDUCTION; MODELS; OBJECTS; SPACE; MRI
Web of Science 类别: Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic
研究方向: Computer Science; Engineering
IDS 号: 182EK 
ISSN: 1077-3142 


第 71 条,共 223 条
标题: High conversion efficiency femtosecond optical parametric amplifier based on silicon waveguide in mid-infrared 
作者: Wen, J (Wen, Jin); Liu, HJ (Liu, Hongjun); Huang, N (Huang, Nan); Sun, QB (Sun, Qibing)
来源出版物: OPTICS AND LASER TECHNOLOGY  卷: 50  页: 87-92  DOI: 10.1016/j.optlastec.2013.02.017  出版年: SEP 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: The mid-infrared femtosecond optical parametric amplifier (OPA) in silicon waveguide is proposed and investigated numerically. Through appropriately engineering the waveguide dimensions, the zero-dispersion wavelength of the silicon waveguide can be tailored to 2.1 mu m and the broadband phase-matching can be realized. We achieve a conversion efficiency of -40 dB and a conversion bandwidth of over 300 nm for a low pump peak power in 8-mm-long silicon waveguide. We also analyze the evolution of the pump, signal and idler pulses in the process of optical parametric amplification. The proposed OPA exhibits compact configuration and can find important applications in integrated broadband optical source and ultrafast all-optical signal processing in mid-infrared. (c) 2013 Elsevier Ltd. All rights reserved.
文献类型: Article
作者关键词: Nonlinear optics; Silicon waveguide; Four-wave mixing
KeyWords Plus: SELF-PHASE MODULATION; MU-M WAVELENGTH; 2-PHOTON ABSORPTION; DISPERSION; PULSES; WIRES; GAIN
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 150DS 
ISSN: 0030-3992 


第 72 条,共 223 条
标题: High-temperature solar cell for concentrated solar-power hybrid systems 
作者: Yang, Y (Yang, Yang); Yang, WZ (Yang, Wenzheng); Tang, WD (Tang, Weidong); Sun, CD (Sun, Chuandong)
来源出版物: APPLIED PHYSICS LETTERS  卷: 103  期: 8  文献号: 083902  DOI: 10.1063/1.4819201  出版年: AUG 19 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: A high-temperature solar cell is proposed that harvests solar energy at elevated temperatures. Carrier separation is achieved by selective contacts that preferentially extract electrons or holes. The theoretical conversion efficiency of the proposed device is 38.6% at 600K and an incident solar radiation concentration of 1000. The waste heat of this cell could be used by a secondary thermal converter boosting the total efficiency of the hybrid system above 55%. (C) 2013 AIP Publishing LLC.
文献类型: Article
KeyWords Plus: CONVERTERS; PERFORMANCE; EFFICIENCY
Web of Science 类别: Physics, Applied
研究方向: Physics
IDS 号: 209VH 
ISSN: 0003-6951 


第 73 条,共 223 条
标题: Compact all-fiber laser delivering conventional and dissipative solitons 
作者: Mao, D (Mao, Dong); Liu, XM (Liu, Xueming); Han, DD (Han, Dongdong); Lu, H (Lu, Hua)
来源出版物: OPTICS LETTERS  卷: 38  期: 16  页: 3190-3193  DOI: 10.1364/OL.38.003190  出版年: AUG 15 2013  
Web of Science 核心合集中的 "被引频次": 9 
被引频次合计: 9 
摘要: We report the simultaneous generation of conventional soliton (CS) and dissipative soliton (DS) in a mode-locked fiber laser exploiting chirped fiber Bragg grating and four-port circulator. The bandwidth and duration of the CS are 0.28 nm and 15.1 ps, respectively. However, the giant-chirp DS exhibits a quasi-rectangular spectrum with a bandwidth of 9.5 nm. The duration of the output DS is 7.3 ps and can be compressed to 0.55 ps external to the cavity. Our numerical results agree well with the experimental observations. The flexible all-fiber laser can provide three different pulse sources, which is convenient and attractive for practical applications. (C) 2013 Optical Society of America
PubMed ID: 24104684 
文献类型: Article
KeyWords Plus: NORMAL-DISPERSION; CARBON NANOTUBES; GENERATION; PROPAGATION; RESONANCE; PULSES
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 202HK 
ISSN: 0146-9592 


第 74 条,共 223 条
标题: Bidirectional fiber soliton laser mode-locked by single-wall carbon nanotubes 
作者: Zeng, C (Zeng, Chao); Liu, XM (Liu, Xueming); Yun, L (Yun, Ling)
来源出版物: OPTICS EXPRESS  卷: 21  期: 16  页: 18937-18942  DOI: 10.1364/OE.21.018937  出版年: AUG 12 2013  
Web of Science 核心合集中的 "被引频次": 12 
被引频次合计: 12 
摘要: We report on the experimental observation of a bidirectional fiber soliton laser passively mode-locked by single-wall carbon nanotubes. Two stable pulse trains in opposite directions are delivered simultaneously from the ring cavity. The counterpropagating pulses have different central wavelengths, pulse durations, and repetition rates. By adjusting the fiber birefringence and cavity length, the central wavelengths of two solitons can be the same or different. Experimental observations and analyses demonstrate that the different operating wavelengths result in the unequal repetition rates of two pulses. These unique features may be attributed to the cavity asymmetry and fiber birefringence. (c) 2013 Optical Society of America
PubMed ID: 23938806 
文献类型: Article
KeyWords Plus: NONLINEAR POLARIZATION ROTATION; ERBIUM-DOPED FIBER; NORMAL-CAVITY-DISPERSION; SATURABLE-ABSORBER; ANOMALOUS-DISPERSION; DISSIPATIVE SOLITONS; BRAGG GRATINGS; RING LASER; PULSES; COEXISTENCE
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 200EF 
ISSN: 1094-4087 


第 75 条,共 223 条
标题: Graphene and nanotube mode-locked fiber laser emitting dissipative and conventional solitons 
作者: Cui, YD (Cui, Yudong); Liu, XM (Liu, Xueming)
来源出版物: OPTICS EXPRESS  卷: 21  期: 16  页: 18969-18974  DOI: 10.1364/OE.21.018969  出版年: AUG 12 2013  
Web of Science 核心合集中的 "被引频次": 18 
被引频次合计: 18 
摘要: We propose a bidirectional erbium-doped fiber laser mode-locked with a mixture of graphene and single-walled carbon nanotubes for the first time to our best knowledge. The fiber laser can deliver dissipative soliton (DS) and conventional soliton (CS), circulating in opposite directions. The net-cavity dispersion is normal in the clockwise direction and anomalous in counter clockwise direction, respectively, and then DS and CS are generated with the suitable adjustment of attenuators. The output DS and CS approximately have the same central wavelength, but exhibit different optical spectra, pulse durations, and repetition rates. The all-fiber switchable laser can provide two different pulse sources, which is convenient for practical applications. (c) 2013 Optical Society of America
PubMed ID: 23938811 
文献类型: Article
KeyWords Plus: NONLINEAR POLARIZATION ROTATION; NORMAL-CAVITY-DISPERSION; GRAPHITE OXIDE; RING LASER; COEXISTENCE; EVOLUTION; PULSES
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 200EF 
ISSN: 1094-4087 


第 76 条,共 223 条
标题: Suppression of the fluctuation effect in terahertz imaging using homomorphic filtering 
作者: Xu, LM (Xu, Limin); Fan, WH (Fan, Wenhui); Liu, J (Liu, Jia)
来源出版物: CHINESE OPTICS LETTERS  卷: 11  期: 8  文献号: 081201  DOI: 10.3788/COL201311.081201  出版年: AUG 10 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: To suppress the fluctuation effect due to laser power instability and terahertz radiation fluctuation, a homomorphic filtering method is proposed to process the terahertz images obtained from a pulsed terahertz raster scanning imaging system. The physical model of homomorphic filtering for terahertz imaging is established. The mathematical expressions are given with the specific physical meaning in accordance with the imaging principle. To demonstrate the effectiveness of the method, a homomorphic filtering experiment based on two raw terahertz images selected from the literature using a continuous-wave (CW) terahertz source is also performed. The effect of the method is compared with those described in the literature, and the advantages of homomorphic filtering are discussed. The pulsed- and CW-terahertz image processing results both show that in addition to suppressing the fluctuation effect, the method can also enhance target imaging.
文献类型: Article
KeyWords Plus: SUPERRESOLUTION IMAGE; REAL-TIME; SYSTEM; RECONSTRUCTION; RESTORATION; WAVES
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 206OK 
ISSN: 1671-7694 


第 77 条,共 223 条
标题: Analytical model of amplitude-weighted array technology in forming symmetrical radiation patterns 
作者: Zhong, LX (Zhong, Lanxiang); Zhang, ZY (Zhang, Zhiyong); Li, JL (Li, Jianlang)
来源出版物: CHINESE OPTICS LETTERS  卷: 11  期: 8  文献号: 080102  DOI: 10.3788/COL201311.080102  出版年: AUG 10 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: A method on amplitude-weighted array technology is proposed based on an analytical formula in which the radiation amplitudes of array elements are evaluated analytically by a random symmetrical far-field radiation pattern. Using this formula, any desired spatial radiation pattern in the far field could be built by applying the analytical solutions of radiation amplitudes of array elements. To check the validity of this formula as well as the proposed technique, an annular intensity distribution as target far-field pattern is designed, and the respective radiation amplitude of array elements are determined by solving the formula analytically. The available far-field pattern is calculated by applying these solutions and then compared with the target far-field pattern. The theoretical results show the capabilities of the analytical derivation as well as the proposed technique in forming specific radiation patterns.
文献类型: Article
KeyWords Plus: DIFFERENTIAL EVOLUTION; GENETIC-ALGORITHMS; PHASED-ARRAYS; OPTIMIZATION; SIDELOBE
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 206OK 
ISSN: 1671-7694 


第 78 条,共 223 条
标题: SIFT on manifold: An intrinsic description 
作者: Zhu, GK (Zhu, Guokang); Wang, Q (Wang, Qi); Yuan, Y (Yuan, Yuan); Yan, PK (Yan, Pingkun)
来源出版物: NEUROCOMPUTING  卷: 113  页: 227-233  DOI: 10.1016/j.neucom.2013.01.020  出版年: AUG 3 2013  
Web of Science 核心合集中的 "被引频次": 2 
被引频次合计: 2 
摘要: Scale Invariant Feature Transform is a widely used image descriptor, which is distinctive and robust in real-world applications. However, the high dimensionality of this descriptor causes computational inefficiency when there are a large number of points to be processed. This problem has led to several attempts at developing more compact SIFT-like descriptors, which are suitable for faster matching while still retaining their outstanding performance. This paper focuses on the SIFT descriptor and explore a dimensionality reduction for its local representation. By using the manifold learning algorithm of Locality Preserving Projections, a more effective and efficient descriptor LPP-SIFT can be obtained. A large number of experiments have been carried out to demonstrate the effectiveness of LPP-SIFT. Besides, the practicability of LPP-SIFT is also shown in another set of experiments for image similarity measurement. (C) 2013 Elsevier B.V. All rights reserved.
文献类型: Article
作者关键词: Computer vision; Manifold learning; Scale invariant feature transform; Locality preserving projections; Descriptor
KeyWords Plus: NONLINEAR DIMENSIONALITY REDUCTION; INTEREST POINT DETECTORS; FEATURES; SCALE
Web of Science 类别: Computer Science, Artificial Intelligence
研究方向: Computer Science
IDS 号: 158ER 
ISSN: 0925-2312 


第 79 条,共 223 条
标题: Experimental study on mode matching for preparation of squeezed light at 1064 nm 
作者: Feng, F (Feng, Fei); Zhang, TY (Zhang, Tongyi); Qu, WY (Qu, Wenyan); Song, JZ (Song, Jiazheng)
来源出版物: OPTICAL ENGINEERING  卷: 52  期: 8  文献号: 086102  DOI: 10.1117/1.OE.52.8.086102  出版年: AUG 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: The effect of mode matching on the preparation of the squeezed light at 1064 nm with periodically poled KTiOPO4 (PPKTP) crystal is reported. We can derive the desired mode by improving the spatial mode matching into optical cavities, including the beam from the laser mode matched to the optical parametric amplifier cavity and mode cleaning cavity; also it is useful for the stability of the locking systems. By increasing the fringe visibility between the squeezed light and the local oscillator beam, a squeezing level of -8.75 dB or even higher could be observed, even with the same experimental parameters as described elsewhere. (C) 2013 Society of Photo-Optical Instrumentation Engineers (SPIE)
文献类型: Article
作者关键词: squeezed light; mode matching; balanced homodyne detection
KeyWords Plus: OPTICAL PARAMETRIC OSCILLATOR; GENERATION
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 216NP 
ISSN: 0091-3286 


第 80 条,共 223 条
标题: DYNAMIC VOLTAGE AND FREQUENCY SCALING BASED ON AN ON-CHIP MICROCONTROLLER SYSTEM 
作者: Li, TF (Li, Tiefeng); Ma, CW (Ma, Caiwen); Li, WH (Li, Wenhua)
来源出版物: ELECTRONICS WORLD  卷: 119  期: 1928  页: 12-15  出版年: AUG 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
文献类型: Article
Web of Science 类别: Engineering, Electrical & Electronic; Telecommunications
研究方向: Engineering; Telecommunications
IDS 号: 211AN 
ISSN: 1365-4675 


第 81 条,共 223 条
标题: Theoretical analysis of scanning spectral filter method for coherent intensity contrast enhancement in femtosecond laser system 
作者: Ma, ZR (Ma Zai-Ru); Sui, Z (Sui Zhan); Zhou, GY (Zhou Gui-Yong); Sun, NC (Sun Nian-Chun); Wang, YS (Wang Yi-Shan); Wang, XL (Wang Xiang-Ling); Zhang, B (Zhang Bin); Zhang, RZ (Zhang Rong-Zhu)
来源出版物: ACTA PHYSICA SINICA  卷: 62  期: 15  文献号: 154202  DOI: 10.7498/aps.62.154202  出版年: AUG 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: A scanning spectral filter method is proposed for improving the intensity contrast originating from the phase ripple in the femtosecond chains, which is made using the character that the instantaneous frequency varies with the time approximately linearly for the chirped pulse in the time-frequency domain. The scanning spectral filtering for reducing the pre-pulse and post-pulse intensity is analyzed in the time-frequency domain by using the short-time Fourier transformation method. Results show that the coherent intensity pulse contrast can be improved by 0.41F(2) for the chirped pulse or the compressed pulse, and the transmission efficiency of the chirped pulse can exceed 90% when the synchronizing time of the jitter ranges from -2 ps to 2 ps and the chirp rate p from 0.9 C/T-2 to 1.1C /T-2.
文献类型: Article
作者关键词: ultrafast optics; coherent pulse contrast; spectral scanning filtering; short time Fourier transformation
KeyWords Plus: CHIRPED-PULSE AMPLIFICATION; POLARIZED WAVE GENERATION; TEMPORAL CONTRAST; PROPAGATION; SCHEME
Web of Science 类别: Physics, Multidisciplinary
研究方向: Physics
IDS 号: 208BI 
ISSN: 1000-3290 


第 82 条,共 223 条
标题: Positive-negative nonlocal lensless imaging based on statistical optics 
作者: Yao, YP (Yao Yin-Ping); Wan, RG (Wan Ren-Gang); Xue, YL (Xue Yu-Lang); Zhang, SW (Zhang Shi-Wei); Zhang, TY (Zhang Tong-Yi)
来源出版物: ACTA PHYSICA SINICA  卷: 62  期: 15  文献号: 154201  DOI: 10.7498/aps.62.154201  出版年: AUG 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: Based on correlated imaging with pseudo-thermal light, Wu and Meyers independently experimentally showed that both positive and negative images can be obtained by using a novel algorithm. With the theory of statistical optics, we construct the model of thermal light, and demonstrate the novel algorithm for image reconstruction. To deal with the data attained in the correlated imaging, we reorder the intensity recorded by the bucket detector according to the value of fluctuation. For a given fluctuation range with all the records above or below a specific value, we can obtain either positive or negative images by calculate the correlation between the selected records of the bucket detector and the reference detector. Nevertheless, without correlated calculations, positive or negative images can be also produced by directly averaging the corresponding records of the reference detector with positive or negative fluctuations. Meanwhile, the visibility of imaging is greatly enhanced. This correspondence imaging method further demonstrates the importance of intensity fluctuations in the nonlocal imaging with thermal light. We also experimentally show the images that obtained by the correlation method and the positive-negative correspondence imaging method, respectively. Our results indicate that this novel algorithm has a better visibility than that of the conventional correlated imaging.
文献类型: Article
作者关键词: statistical optics; thermal light; correlation imaging; positive and negative nonlocal images
KeyWords Plus: TRUE THERMAL LIGHT
Web of Science 类别: Physics, Multidisciplinary
研究方向: Physics
IDS 号: 208BI 
ISSN: 1000-3290 


第 83 条,共 223 条
标题: Ranking Graph Embedding for Learning to Rerank 
作者: Pang, YW (Pang, Yanwei); Ji, Z (Ji, Zhong); Jing, PG (Jing, Peiguang); Li, XL (Li, Xuelong)
来源出版物: IEEE TRANSACTIONS ON NEURAL NETWORKS AND LEARNING SYSTEMS  卷: 24  期: 8  页: 1292-1303  DOI: 10.1109/TNNLS.2013.2253798  出版年: AUG 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: Dimensionality reduction is a key step to improving the generalization ability of reranking in image search. However, existing dimensionality reduction methods are typically designed for classification, clustering, and visualization, rather than for the task of learning to rank. Without using of ranking information such as relevance degree labels, direct utilization of conventional dimensionality reduction methods in ranking tasks generally cannot achieve the best performance. In this paper, we show that introducing ranking information into dimensionality reduction significantly increases the performance of image search reranking. The proposed method transforms graph embedding, a general framework of dimensionality reduction, into ranking graph embedding (RANGE) by modeling the global structure and the local relationships in and between different relevance degree sets, respectively. The proposed method also defines three types of edge weight assignment between two nodes: binary, reconstruction, and global. In addition, a novel principal components analysis based similarity calculation method is presented in the stage of global graph construction. Extensive experimental results on the MSRA-MM database demonstrate the effectiveness and superiority of the proposed RANGE method and the image search reranking framework.
文献类型: Article
作者关键词: Dimensionality reduction; graph embedding; image search reranking; learning to rank
KeyWords Plus: DIMENSIONALITY REDUCTION; RELEVANCE FEEDBACK; VIDEO ANNOTATION; IMAGE RETRIEVAL; SEARCH; FRAMEWORK; SUBSPACE
Web of Science 类别: Computer Science, Artificial Intelligence; Computer Science, Hardware & Architecture; Computer Science, Theory & Methods; Engineering, Electrical & Electronic
研究方向: Computer Science; Engineering
IDS 号: 186JJ 
ISSN: 2162-237X 


第 84 条,共 223 条
标题: Flexible optical clock recovery utilizing a multi-function semiconductor fiber laser 
作者: Feng, H (Feng, H.); Zhao, W (Zhao, W.); Xie, XP (Xie, X. P.); Qian, FC (Qian, F. C.); Wang, W (Wang, W.); Huang, X (Huang, X.); Hu, H (Hu, H.)
来源出版物: LASER PHYSICS  卷: 23  期: 8  文献号: 085109  DOI: 10.1088/1054-660X/23/8/085109  出版年: AUG 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: We demonstrate a multi-function fiber laser based on cross-gain modulation in a semiconductor optical amplifier (SOA). Depending on the input signals, the fiber cavity can emit a continuous wave (CW) laser, mode-locked pulses, or act as a clock recovery device. With an extra CW light overcoming the pattern effect in the clock recovery process, a 10-GHz synchronous clock sequence with <0.1 power fluctuation and <120-fs timing jitter is extracted from the transmission return-to-zero data stream. We further analyze the recovered clock properties as a function of the input signal, and find that the clock recovery system presents good stability over a large range of input signal characteristics. The multi-function fiber laser exhibits the advantages of compact configuration and low cost, which is very convenient and attractive for optical communications and signal processing.
文献类型: Article
KeyWords Plus: COMB-LIKE FILTER; ELECTROABSORPTION MODULATOR; NORMAL-DISPERSION; RING OSCILLATOR; SOA; AMPLIFIER; COMBINATION; CIRCUIT; REDUCE; CAVITY
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 185LR 
ISSN: 1054-660X 


第 85 条,共 223 条
标题: Ghosting theoretical model of single photon counting imagers with Vernier anode 
作者: Yang, H (Yang Hao); Zhao, BS (Zhao BaoSheng); Yan, QR (Yan QiuRong); Liu, YA (Liu YongAn)
来源出版物: SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY  卷: 56  期: 8  页: 1472-1477  DOI: 10.1007/s11433-013-5088-3  出版年: AUG 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: In this paper, the distribution of the phase deviations for the ghosting of Vernier based imagers is provided. The equality of the phase errors is shown. The relationship between the charge noise amplitude of electrodes and the total charge noise amplitude is provided. The relationship between the phase error and the total charge noise amplitude is also provided, which reveals the magnitude of 10(4) electrons for the ghosting occurrence threshold for the 4-coarse-pixel anode imagers.
文献类型: Article
作者关键词: ghosting phenomenon; phase error; noise amplitude
KeyWords Plus: DETECTOR
Web of Science 类别: Physics, Multidisciplinary
研究方向: Physics
IDS 号: 184EX 
ISSN: 1674-7348 


第 86 条,共 223 条
标题: Effects of alkaline-earth fluorides and OH- on spectroscopic properties of Yb3+ doped TeO2-ZnO-B2O3 based glasses 
作者: Xu, SN (Xu, Shennuo); Wang, PF (Wang, Pengfei); Zheng, RL (Zheng, Ruilin); Wei, W (Wei, Wei); Peng, B (Peng, Bo)
来源出版物: JOURNAL OF LUMINESCENCE  卷: 140  页: 26-29  DOI: 10.1016/j.jlumin.2013.02.056  出版年: AUG 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: New kinds of Yb2O3-doped boro-tellurite (TeO2-ZnO-B2O3) based glasses were prepared by introducing alkaline-earth fluorides (MgF2, CaF2, SrF2, and BaF2). Their structural and spectroscopic properties were investigated by Raman and absorption spectra measurements. Dehydration ability of alkaline-earth fluorides was studied. The OH- can have an obvious effect on fluorescence lifetime of Yb3+, when OH- concentration is higher than N-OH=4.66x10(19) cm(-3). For TeO2-ZnO-B2O3-BaF2 glass system, the peak values of integrated absorption and emission cross-sections achieve 7.44x10(4) pm(3) and 1.416 pm(2), respectively. It indicates that the Yb3+.-doped boro-tellurite glasses containing alkaline-earth fluorides are potential materials for waveguide laser, and optical amplifier. (c) 2013 Elsevier B.V. All rights reserved.
文献类型: Article
作者关键词: Boro-tellurite glass; Alkaline-earth fluorides; Emission cross-section; Raman spectra
KeyWords Plus: EMISSION CROSS-SECTION; TELLURITE GLASSES; LASER; SPECTRA; IONS; FLUORESCENCE; YTTERBIUM
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 146KJ 
ISSN: 0022-2313 


第 87 条,共 223 条
标题: Optical color image hiding scheme based on chaotic mapping and Hartley transform 
作者: Liu, ZJ (Liu, Zhengjun); Zhang, Y (Zhang, Yu); Liu, W (Liu, Wei); Meng, FY (Meng, Fanyi); Wu, Q (Wu, Qun); Liu, ST (Liu, Shutian)
来源出版物: OPTICS AND LASERS IN ENGINEERING  卷: 51  期: 8  页: 967-972  DOI: 10.1016/j.optlaseng.2013.02.015  出版年: AUG 2013  
Web of Science 核心合集中的 "被引频次": 5 
被引频次合计: 6 
摘要: We present a color image encryption algorithm by using chaotic mapping and Hartley transform. The three components of color image are scrambled by Baker mapping. The coordinates composed of the scrambled monochrome components are converted from Cartesian coordinates to spherical coordinates. The data of azimuth angle is normalized and regarded as the key. The data of radii and zenith angle are encoded under the help of optical Hartley transform with scrambled key. An electro-optical encryption structure is designed. The final encrypted image is constituted by two selected color components of output in real number domain. (C) 2013 Elsevier Ltd. All rights reserved.
文献类型: Article
作者关键词: Optical encryption; Cryptography; Chaotic mapping
KeyWords Plus: FRACTIONAL FOURIER-TRANSFORM; ENCRYPTION ALGORITHM; PLAINTEXT ATTACK; ARNOLD TRANSFORM; FRESNEL DOMAIN; OPERATION; INTERFERENCE; DECRYPTION
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 137VC 
ISSN: 0143-8166 


第 88 条,共 223 条
标题: Energy-saving object detection by efficiently rejecting a set of neighboring sub-images 
作者: Pan, J (Pan, Jing); Pang, YW (Pang, Yanwei); Zhang, K (Zhang, Kun); Yuan, Y (Yuan, Yuan); Wang, KQ (Wang, Kongqiao)
来源出版物: SIGNAL PROCESSING  卷: 93  期: 8  特刊: SI  页: 2205-2211  DOI: 10.1016/j.sigpro.2012.08.019  出版年: AUG 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: Object detection is crucial for multimedia processing such as image understanding and video analysis. Due to the large amount of images and videos and the limited computational resource, effective and efficient object detection is challenging. Although much effort has been done to develop fast object detection algorithms, little work was concentrated on energy-saving algorithms. Even two detection algorithms that detect objects in the same speed may consume different electronic energies. In this paper, we focus on developing an energy-saving object detection algorithm which can reject a bundle of neighboring sub-images with only one inner-product operation and an acceptable number of addition ones. The total number of multiplications and additions of our algorithm is almost equal to that of the traditional sliding-window method. But in our algorithm the number of multiplication operations is much smaller. Because addition operation consumes less energy than multiplication operation, the proposed method is more energy-saving and efficient. Experimental results on hand detection show that our approach leads to significant improvements in energy and efficiency. (C) 2012 Elsevier B.V. All rights reserved.
文献类型: Article
作者关键词: Object detection; Fast algorithm; Pattern recognition; Energy-saving algorithm
KeyWords Plus: FACE DETECTION; ROBUST; FEATURES
Web of Science 类别: Engineering, Electrical & Electronic
研究方向: Engineering
IDS 号: 139KP 
ISSN: 0165-1684 


第 89 条,共 223 条
标题: High-birefringence, low-loss porous fiber for single-mode terahertz-wave guidance 
作者: Chen, NN (Chen, Na-na); Liang, J (Liang, Jian); Ren, LY (Ren, Li-yong)
来源出版物: APPLIED OPTICS  卷: 52  期: 21  页: 5297-5302  DOI: 10.1364/AO.52.005297  出版年: JUL 20 2013  
Web of Science 核心合集中的 "被引频次": 3 
被引频次合计: 3 
摘要: A new kind of polymer porous fiber with elliptical air-holes is designed for obtaining high birefringence in the terahertz (THz) frequency range in this paper. Using the finite element method, the properties of this kind of fiber are simulated in detail including the single-mode propagation condition, the birefringence, and the loss. Theoretical results indicate that the single-mode THz wave in the frequency range from 0.73 to 1.22 THz can be guided in the fiber; the birefringence can be enhanced by rotating the major axis of the elliptical air-hole and there exists an optimal rotating angle at 30 degrees. At this optimal angle a birefringence as high as 0.0445 can be obtained in a wide frequency range. Low-loss THz guidance can be achieved owing to the effective reduction of the material absorption in such a porous fiber. This research is useful for polarization-maintaining THz-wave guidance. (c) 2013 Optical Society of America
PubMed ID: 23872779 
文献类型: Article
KeyWords Plus: PHOTONIC CRYSTAL FIBERS; DISPERSION; GUIDES; SPECTROSCOPY; PROPAGATION; FABRICATION; RADIATION; LATTICE
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 185ZV 
ISSN: 1559-128X 


第 90 条,共 223 条
标题: A dielectric-barrier discharge enhanced plasma brush array at atmospheric pressure 
作者: Li, XM (Li, Xuemei); Tang, J (Tang, Jie); Zhan, XF (Zhan, Xuefang); Yuan, X (Yuan, Xin); Zhao, ZJ (Zhao, Zhongjun); Yan, YY (Yan, Yanyue); Duan, YX (Duan, Yixiang)
来源出版物: APPLIED PHYSICS LETTERS  卷: 103  期: 3  文献号: 033519  DOI: 10.1063/1.4816061  出版年: JUL 15 2013  
Web of Science 核心合集中的 "被引频次": 5 
被引频次合计: 5 
摘要: This study developed a large volume cold atmospheric plasma brush array, which was enhanced by a dielectric barrier discharge by integrating a pair of DC glow discharge in parallel. A platinum sheet electrode was placed in the middle of the discharge chamber, which effectively reduced the breakdown voltage and working voltage. Emission spectroscopy diagnosis indicated that many excited argon atoms were distributed almost symmetrically in the lateral direction of the plasma. The concentration variations of reactive species relative to the gas flow rate and discharge current were also examined. (C) 2013 AIP Publishing LLC.
文献类型: Article
KeyWords Plus: CORONA DISCHARGE; ARGON; AIR; STERILIZATION; GENERATION; JET
Web of Science 类别: Physics, Applied
研究方向: Physics
IDS 号: 187UM 
ISSN: 0003-6951 


第 91 条,共 223 条
标题: Electromagnetic resonance tunneling in a single-negative sandwich structure 
作者: Kang, YQ (Kang, Yongqiang); Zhang, CM (Zhang, Chunmin); Gao, P (Gao, Peng); Ren, WY (Ren, Wenyi)
来源出版物: JOURNAL OF MODERN OPTICS  卷: 60  期: 13  页: 1021-1026  DOI: 10.1080/09500340.2013.827251  出版年: JUL 1 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: The electromagnetic wave tunneling phenomenon in a sandwich structure consisting of epsilon-negative (ENG), mu-negative (MNG), and epsilon-negative (ENG) media was investigated. Merging of resonance tunneling modes is demonstrated when the conjugate matched trilayer condition is satisfied. The resonance frequency is found to be independent of the thickness ratio of the matched trilayer structure. The resonance tunneling possesses particular angular-dependent and polarization-free properties. The electric fields corresponding to the frequencies of the resonance modes are found to be strongly localized at just one interface with low transmittance. The possible influence on resonance tunneling due to the losses from the single-negative materials is also investigated.
文献类型: Article
作者关键词: electromagnetic optics; resonance tunneling; metamaterial
KeyWords Plus: REFRACTIVE-INDEX MEDIA; METAMATERIALS; FREQUENCY; MU
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 224RA 
ISSN: 0950-0340 


第 92 条,共 223 条
标题: Influence of driving frequency on discharge modes in a dielectric-barrier discharge with multiple current pulses 
作者: Jiang, WM (Jiang, Weiman); Tang, J (Tang, Jie); Wang, YS (Wang, Yishan); Zhao, W (Zhao, Wei); Duan, YX (Duan, Yixiang)
来源出版物: PHYSICS OF PLASMAS  卷: 20  期: 7  文献号: 073509  DOI: 10.1063/1.4817289  出版年: JUL 2013  
Web of Science 核心合集中的 "被引频次": 2 
被引频次合计: 2 
摘要: A one-dimensional self-consistent fluid model was employed to investigate the effect of the driving frequency on the discharge modes in atmospheric-pressure argon discharge with multiple current pulses. The discharge mode was discussed in detail not only at current peaks but also between two adjacent peaks. The simulation results show that different transitions between the Townsend and glow modes during the discharge take place with the driving frequency increased. A complicated transition from the Townsend mode, through glow, Townsend, and glow, and finally back to the Townsend one is found in the discharge with the driving frequency of 8 kHz. There is a tendency of transition from the Townsend to glow mode for the discharge both at the current peaks and troughs with the increasing frequency. The discharge in the half period can all along operate in the glow mode with the driving frequency high enough. This is resulted from the preservation of more electrons in the gas gap and acquisition of more electron energy from the swiftly varying electric field with the increase in driving frequency. Comparison of the spatial and temporal evolutions of the electron density at different driving frequencies indicates that the increment of the driving frequency allows the plasma chemistry to be enhanced. This electrical characteristic is important for the applications, such as surface treatment and biomedical sterilization. (C) 2013 AIP Publishing LLC.
文献类型: Article
KeyWords Plus: PRESSURE GLOW-DISCHARGE; ATMOSPHERIC-PRESSURE; SURFACE-TREATMENT; HELIUM; PLASMA; FILAMENTARY; TRANSITION; SIMULATION; PHYSICS; AIR
Web of Science 类别: Physics, Fluids & Plasmas
研究方向: Physics
IDS 号: 193CR 
ISSN: 1070-664X 


第 93 条,共 223 条
标题: Effects of different ligands on luminescence properties of LaF3:Nd nanoparticles 
作者: Gui, L (Gui Luo); Cui, XX (Cui Xiaoxia); Wei, W (Wei Wei); Peng, B (Peng Bo); Fan, DY (Fan Dianyuan)
来源出版物: JOURNAL OF RARE EARTHS  卷: 31  期: 7  页: 645-649  DOI: 10.1016/S1002-0721(12)60335-4  出版年: JUL 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: A series of neodymium-doped lanthanum fluoride nanoparticles (NPs) were synthesized with hydrothermal method, and the effects of several ligands on the luminescence properties of the NPs were investigated. The X-ray diffraction (XRD) results indicated that the crystal phases of the modified NPs coincided with the standard spectrum. The transmission electron microscopy (TEM) showed that the samples were of similar size, shape and dispersibility. The infrared spectra suggested that the content of OH groups as quenchers on the NPs surfaces decreased after modification. Compared with NPs modified by branched paraffin ligands, NPs conjugating ring-contained modifiers had less quenching effect and possessed stronger fluorescence intensity and longer fluorescence lifetime.
文献类型: Article
作者关键词: hydrothermal method; luminescence properties; modification; nanoparticles; rare earths
KeyWords Plus: SURFACE MODIFICATION; NANOCRYSTALS; CONVERSION; ND3+; STRATEGIES; COMPLEXES; EMISSION; LASER; YB3+
Web of Science 类别: Chemistry, Applied
研究方向: Chemistry
IDS 号: 204XB 
ISSN: 1002-0721 


第 94 条,共 223 条
标题: 1.5 kW Incoherent Beam Combining of Four Fiber Lasers Using Adaptive Fiber-Optics Collimators 
作者: Geng, C (Geng, Chao); Zhao, BY (Zhao, Baoyin); Zhang, ET (Zhang, Entao); Luo, W (Luo, Wen); Tan, Y (Tan, Yi); Zhu, YG (Zhu, Yonggang); Yang, HN (Yang, Hening); Mu, JB (Mu, Jinbo); Li, XY (Li, Xinyang); Duan, KL (Duan, Kailiang); Zhao, W (Zhao, Wei)
来源出版物: IEEE PHOTONICS TECHNOLOGY LETTERS  卷: 25  期: 13  页: 1286-1289  DOI: 10.1109/LPT.2013.2263123  出版年: JUL 1 2013  
Web of Science 核心合集中的 "被引频次": 4 
被引频次合计: 4 
摘要: We demonstrate the incoherent beam combining (BC) of four high-power single-mode fiber lasers. Adaptive fiber-optics collimators (AFOC) of 0.5 kW-level are developed to correct the tip/tilt-type phase errors among beamlets. The maximum deflection angle of the AFOC is about 0.29 mrad. A stochastic parallel gradient descent algorithm is employed as the tip/tilt control strategy. The tip/tilt control makes four separate laser beams overlap with each other in the far-field, and the average of normalized power-in-bucket increases from 0.171 in open loop to 0.798 in closed loop when 1.5-kW total output power is achieved. The precise tracking ability and control accuracy of this BC system are investigated. Experimental results expose that thermal-blooming effect disturbs BC seriously when the total output power is up to kW-level, which could be mitigated by inducing air flow near the laser output.
文献类型: Article
作者关键词: High-power fiber laser; beam combining; tip/tilt control; adaptive fiber-optics collimator; thermal-blooming
KeyWords Plus: HIGH-POWER; AMPLIFIER ARRAY; COMBINATION
Web of Science 类别: Engineering, Electrical & Electronic; Optics; Physics, Applied
研究方向: Engineering; Optics; Physics
IDS 号: 190WH 
ISSN: 1041-1135 
电子 ISSN: 1941-0174 


第 95 条,共 223 条
标题: Formation of nanogratings in a transparent material with tunable ionization property by femtosecond laser irradiation 
作者: Umran, FA (Umran, Fadhil A.); Liao, Y (Liao, Yang); Elias, MM (Elias, Mazin M.); Sugioka, K (Sugioka, Koji); Stoian, R (Stoian, Razvan); Cheng, GH (Cheng, Guanghua); Cheng, Y (Cheng, Ya)
来源出版物: OPTICS EXPRESS  卷: 21  期: 13  页: 15259-15267  DOI: 10.1364/OE.21.015259  出版年: JUL 1 2013  
Web of Science 核心合集中的 "被引频次": 4 
被引频次合计: 4 
摘要: Irradiation inside some transparent materials such as fused silica can induce nanograting structures at the focal area. Here, we investigate experimentally how the nanograting formation can be influenced by tuning the ionization property of the transparent material, which is achieved by irradiation inside a porous glass immersed in water doped with NaCl at variable concentrations. Our results show that the doping of NaCl not only reduces the threshold fluence of optical breakdown, but also leads to nanograting structures with shorter periods. These effects may be attributed to the enhanced photoionization in water doped with NaCl. (C) 2013 Optical Society of America
PubMed ID: 23842312 
文献类型: Article
KeyWords Plus: FUSED-SILICA; GLASS; SURFACE
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 176FF 
ISSN: 1094-4087 


第 96 条,共 223 条
标题: Visual Saliency by Selective Contrast 
作者: Wang, Q (Wang, Qi); Yuan, Y (Yuan, Yuan); Yan, PK (Yan, Pingkun)
来源出版物: IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY  卷: 23  期: 7  页: 1150-1155  DOI: 10.1109/TCSVT.2012.2226528  出版年: JUL 2013  
Web of Science 核心合集中的 "被引频次": 8 
被引频次合计: 8 
摘要: Automatic detection of salient objects in visual media (e. g., videos and images) has been attracting much attention. The detected salient objects can be utilized for segmentation, recognition, and retrieval. However, the accuracy of saliency detection remains a challenge. The reason behind this challenge is mainly due to the lack of a well-defined model for interpreting saliency formulation. To tackle this problem, this letter proposes to detect salient objects based on selective contrast. Selective contrast intrinsically explores the most distinguishable component information in color, texture, and location. A large number of experiments are thereafter carried out upon a benchmark dataset, and the results are compared with those of 12 other popular state-of-the-art algorithms. In addition, the advantage of the proposed algorithm is also demonstrated in a retargeting application.
文献类型: Article
作者关键词: Attention; saliency; selective contrast; visual media
KeyWords Plus: REGION DETECTION; SEGMENTATION; ATTENTION
Web of Science 类别: Engineering, Electrical & Electronic
研究方向: Engineering
IDS 号: 176BC 
ISSN: 1051-8215 
电子 ISSN: 1558-2205 


第 97 条,共 223 条
标题: Embedding Motion and Structure Features for Action Recognition 
作者: Zhen, XT (Zhen, Xiantong); Shao, L (Shao, Ling); Tao, DC (Tao, Dacheng); Li, XL (Li, Xuelong)
来源出版物: IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY  卷: 23  期: 7  页: 1182-1190  DOI: 10.1109/TCSVT.2013.2240916  出版年: JUL 2013  
Web of Science 核心合集中的 "被引频次": 6 
被引频次合计: 6 
摘要: We propose a novel method to model human actions by explicitly coding motion and structure features that are separately extracted from video sequences. Firstly, the motion template (one feature map) is applied to encode the motion information and image planes (five feature maps) are extracted from the volume of differences of frames to capture the structure information. The Gaussian pyramid and center-surround operations are performed on each of the six obtained feature maps, decomposing each feature map into a set of subband maps. Biologically inspired features are then extracted by successively applying Gabor filtering and max pooling on each subband map. To make a compact representation, discriminative locality alignment is employed to embed the high-dimensional features into a low-dimensional manifold space. In contrast to sparse representations based on detected interest points, which suffer from the loss of structure information, the proposed model takes into account the motion and structure information simultaneously and integrates them in a unified framework; it therefore provides an informative and compact representation of human actions. The proposed method is evaluated on the KTH, the multiview IXMAS, and the challenging UCF sports datasets and outperforms state-of-the-art techniques on action recognition
文献类型: Article
作者关键词: Biologically inspired features; discriminative locality alignment; human action recognition
KeyWords Plus: ACTION REPRESENTATION; SCENE CLASSIFICATION; OBJECT RECOGNITION; LOCALIZATION; CONTEXT; POINTS; IMAGES; CORTEX; SCALE
Web of Science 类别: Engineering, Electrical & Electronic
研究方向: Engineering
IDS 号: 176BC 
ISSN: 1051-8215 


第 98 条,共 223 条
标题: All-normal-dispersion passively mode-locked Yb-doped fiber ring laser based on a graphene oxide saturable absorber 
作者: Li, XH (Li, X. H.); Wang, YG (Wang, Y. G.); Wang, YS (Wang, Y. S.); Zhang, YZ (Zhang, Y. Z.); Wu, K (Wu, K.); Shum, PP (Shum, P. P.); Yu, X (Yu, X.); Zhang, Y (Zhang, Y.); Wang, QJ (Wang, Q. J.)
来源出版物: LASER PHYSICS LETTERS  卷: 10  期: 7  文献号: 075108  DOI: 10.1088/1612-2011/10/7/075108  出版年: JUL 2013  
Web of Science 核心合集中的 "被引频次": 11 
被引频次合计: 11 
摘要: We have demonstrated an all-normal-dispersion passively mode-locked Yb-doped fiber laser using a graphene oxide/polyvinyl alcohol (GO-PVA) saturable absorber without surfactant, for the first time to the best of our knowledge. The experimental results show that the pulse duration of the mode-locked lasers varies from 191 ps to 1.68 ns, while the cavity round trip time changes from 24 to 458 ns, through the variation of the cavity length. In addition, the proposed passively mode-locked fiber laser demonstrates a maximum average output power of 539 mW with a laser cavity length of 94 m, and the corresponding single pulse energy reaches 0.429 mu J. The proposed mode-locked fiber lasers with large chirp pulses may find potential applications in fiber chirped pulse amplification systems for micromachining, material processing and diagnostic applications.
文献类型: Article
KeyWords Plus: WALLED CARBON NANOTUBES; ULTRAFAST PHOTONICS; PULSE GENERATION; FEMTOSECOND; CRYSTAL
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 166NF 
ISSN: 1612-2011 


第 99 条,共 223 条
标题: Compact single-frequency Tm:YAG ceramic laser with a volume Bragg grating 
作者: Long, JY (Long, J. Y.); Shen, DY (Shen, D. Y.); Wang, YS (Wang, Y. Sh); Zhang, J (Zhang, J.); Tang, DY (Tang, D. Y.)
来源出版物: LASER PHYSICS LETTERS  卷: 10  期: 7  文献号: 075805  DOI: 10.1088/1612-2011/10/7/075805  出版年: JUL 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: We demonstrated a compact high-power single-frequency Tm:YAG ceramic laser operating at 1999.7 nm. Single-frequency operation was achieved by incorporating a reflection volume Bragg grating (VBG) in a laser with a short cavity length. The laser emission has a spectral linewidth of similar to 10 MHz and a maximum output power of 1.4 W, which is limited by the pump-induced thermal-lens effect of the laser.
文献类型: Article
KeyWords Plus: HIGH-POWER; ROOM-TEMPERATURE; HIGH-EFFICIENCY; RING LASER; 1617 NM; TM-YAG; OUTPUT
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 166NF 
ISSN: 1612-2011 
电子 ISSN: 1612-202X 


第 100 条,共 223 条
标题: Graph-Regularized Low-Rank Representation for Destriping of Hyperspectral Images 
作者: Lu, XQ (Lu, Xiaoqiang); Wang, YL (Wang, Yulong); Yuan, Y (Yuan, Yuan)
来源出版物: IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING  卷: 51  期: 7  页: 4009-4018  DOI: 10.1109/TGRS.2012.2226730  子辑: 1  出版年: JUL 2013  
Web of Science 核心合集中的 "被引频次": 2 
被引频次合计: 3 
摘要: Hyperspectral image destriping is a challenging and promising theme in remote sensing. Striping noise is a ubiquitous phenomenon in hyperspectral imagery, which may severely degrade the visual quality. A variety of methods have been proposed to effectively alleviate the effects of the striping noise. However, most of them fail to take full advantage of the high spectral correlation between the observation subimages in distinct bands and consider the local manifold structure of the hyperspectral data space. In order to remedy this drawback, in this paper, a novel graph-regularized low-rank representation (LRR) destriping algorithm is proposed by incorporating the LRR technique. To obtain desired destriping performance, two sides of performing destriping are included: 1) To exploit the high spectral correlation between the observation subimages in distinct bands, the technique of LRR is first utilized for destriping, and 2) to preserve the intrinsic local structure of the original hyperspectral data, the graph regularizer is incorporated in the objective function. The experimental results and quantitative analysis demonstrate that the proposed method can both remove striping noise and achieve cleaner and higher contrast reconstructed results.
文献类型: Article
作者关键词: Destriping; graph regularizer; hyperspectral image; low-rank representation (LRR); spectral correlation
KeyWords Plus: LANDSAT MSS IMAGES; HISTOGRAM-MODIFICATION; STRIPING REMOVAL; MODIS DATA; NOISE; ALGORITHM; REDUCTION; TRANSFORM; PURSUIT
Web of Science 类别: Geochemistry & Geophysics; Engineering, Electrical & Electronic; Remote Sensing; Imaging Science & Photographic Technology
研究方向: Geochemistry & Geophysics; Engineering; Remote Sensing; Imaging Science & Photographic Technology
IDS 号: 171PX 
ISSN: 0196-2892 
第 101 条,共 223 条
标题: The damage property of oxyfluoride glasses irradiated by a 351 nm high fluence laser 
作者: Hou, CQ (Hou, Chaoqi); Li, WN (Li, Weinan); Wang, PF (Wang, Pengfei); Guo, HT (Guo, Haitao); Gao, F (Gao, Fei); Cui, XX (Cui, Xiaoxia); Lu, M (Lu, Min); Peng, B (Peng, Bo)
来源出版物: LASER PHYSICS  卷: 23  期: 7  文献号: 076005  DOI: 10.1088/1054-660X/23/7/076005  出版年: JUL 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: The laser induced damage property of oxyfluoride glasses irradiated by a 351 nm laser has been investigated. Two kinds of oxyfluoride glass (oxyfluoride1 and oxyfluoride2) have been prepared by different preparation technologies and their LIDTs (laser induced damage thresholds) are 9.0 J cm(-2) and 13.6 J cm(-2) respectively. It is found that the variation of LIDT in oxyfluoride glasses is associated with photoluminescence originated structural defects. Decrease of the photoluminescence intensity in an oxyfluoride glass could improve the LIDT of the material. Meanwhile, an experiment on damage growth has been presented, and the damage growth of oxyfluoride glasses develops in the longitudinal direction of laser propagation, which causes the transmittance loss to be limited once the damage growth occurs. Moreover, the damage growth stops when the laser fluence is below 70% of the LIDT.
文献类型: Article
KeyWords Plus: FUSED-SILICA; ABSORPTION; DEFECTS; PULSES; SOLIDS
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 164YU 
ISSN: 1054-660X 


第 102 条,共 223 条
标题: A sub-nanosecond narrow-linewidth pulsed laser source with controllable repetition rate 
作者: Niu, LQ (Niu, L. Q.); Gao, CX (Gao, C. X.); He, HD (He, H. D.); Feng, L (Feng, L.); Cao, ZY (Cao, Z. Y.); Sun, CD (Sun, C. D.); Zhu, SL (Zhu, S. L.)
来源出版物: LASER PHYSICS  卷: 23  期: 7  文献号: 075101  DOI: 10.1088/1054-660X/23/7/075101  出版年: JUL 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: A compact all-fiber sub-nanosecond narrow-linewidth Yb-doped fiber amplifier with a controllable repetition rate has been investigated. Tunable temporal pulses ranging from sub-nanoseconds to 10 ns with repetition rates from 10 kHz to 1 MHz are obtained by controlling the waveform of the injected electrical-pulse signal. Due to the practical requirements of our intended applications, a distributed feedback semiconductor laser with a wavelength of 1064 nm, pulse duration of 802 ps, repetition rate of 500 kHz and average power of 20 mu W is used to seed a dual-stage single mode Yb-doped fiber amplifier. The characteristics of the amplified pulses are measured and exhibit a temporal duration of 810 ps with an average power of 31.2 mW. The gain of the amplified pulse is about 32 dB at the maximum output power. A notable feature of the amplifier pulses is that the spectral linewidth can be maintained to less than 0.1 nm during the dual-stage amplifier process. The noise level lies more than 22 dB below the peak value of the amplified spectrum, which represents an excellent signal-to-noise ratio.
文献类型: Article
KeyWords Plus: CRYSTAL FIBER AMPLIFIER; PEAK-POWER; GENERATION; ENERGY
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 164YU 
ISSN: 1054-660X 


第 103 条,共 223 条
标题: An L-band graphene-oxide mode-locked fiber laser delivering bright and dark pulses 
作者: Zhao, JQ (Zhao, J. Q.); Gwang, Y (Gwang, Y.); Yan, PG (Yan, P. G.); Ruan, SC (Ruan, S. C.); Zhang, GL (Zhang, G. L.); Li, HQ (Li, H. Q.); Tsang, YH (Tsang, Y. H.)
来源出版物: LASER PHYSICS  卷: 23  期: 7  文献号: 075105  DOI: 10.1088/1054-660X/23/7/075105  出版年: JUL 2013  
Web of Science 核心合集中的 "被引频次": 10 
被引频次合计: 10 
摘要: In this work we have demonstrated the generation of L-band bright and dark pulses from a graphene-oxide (GO) mode-locked erbium-doped fiber laser. The polymer-hosted graphene-oxide saturable absorber (SA) was fabricated by a vertical evaporation method, which permitted a flexible choice of GO concentration and SA thickness. Stable fundamental solitons with a width of similar to 770 fs and repetition rate of similar to 21.79 MHz could be directly generated from the laser cavity. The corresponding spectrum was centered at similar to 1596.0 nm with a 3 dB bandwidth of similar to 4.454 nm. Triple solitons and fundamentally repetitive dark pulses could also be achieved. By changing the laser cavity design, we also achieved the generation of dark pulses, which had one to three times the repetition rate. The multiple soliton and dark pulse generation were experimentally observed for the first time in such a GO mode-locked fiber laser system, to the best of our knowledge. Our experimental results indicate that the GOSA can be successfully utilized to realize different mode-locked states in the L-band.
文献类型: Article
KeyWords Plus: INCORPORATING CARBON NANOTUBES; DOMAIN-WALL SOLITONS; SATURABLE ABSORBER; RING LASER; LOCKING
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 164YU 
ISSN: 1054-660X 


第 104 条,共 223 条
标题: 3 W high-power laser passively mode-locked by graphene oxide saturable absorber 
作者: Feng, C (Feng, Chao); Wang, YG (Wang, Yonggang); Liu, J (Liu, Jie); Tsang, YH (Tsang, Yuen H.); Song, YR (Song, Yanrong); Yu, ZH (Yu, Zhenhua)
来源出版物: OPTICS COMMUNICATIONS  卷: 298  页: 168-170  DOI: 10.1016/j.optcom.2013.02.003  出版年: JUL 1 2013  
Web of Science 核心合集中的 "被引频次": 4 
被引频次合计: 4 
摘要: A novel reflective graphene oxide based saturable absorber is fabricated and used to passively mode locked the Nd:YVO4 ultrafast laser system. The maximum average output power measured is 3.06W and the optical to optical conversion efficiency is about 25%. The measured pulse duration and repetition rate are 8.8 ps and 84 MHz. The maximum peak power and the single pulse energy of the mode-locking laser are up to 4.1 kW and 36 nJ, respectively. To the best of our knowledge, it is the highest average output power for the lasers mode locked with graphene based absorbers. (C) 2013 Elsevier B.V. All rights reserved.
文献类型: Article
作者关键词: Graphene oxide; Absorber; Average output power; Mode locking; Ultrafast laser
KeyWords Plus: MU-M; PHOTONICS; CRYSTAL
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 135BY 
ISSN: 0030-4018 


第 105 条,共 223 条
标题: Robust visual tracking with discriminative sparse learning 
作者: Lu, XQ (Lu, Xiaoqiang); Yuan, Y (Yuan, Yuan); Yan, PK (Yan, Pingkun)
来源出版物: PATTERN RECOGNITION  卷: 46  期: 7  页: 1762-1771  DOI: 10.1016/j.patcog.2012.11.016  出版年: JUL 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: Recently, sparse representation in the task of visual tracking has been obtained increasing attention and many algorithms are proposed based on it. In these algorithms for visual tracking, each candidate target is sparsely represented by a set of target templates. However, these algorithms fail to consider the structural information of the space of the target templates, i.e., target template set. In this paper, we propose an algorithm named non-local self-similarity (NLSS) based sparse coding algorithm (NLSSC) to learn the sparse representations, which considers the geometrical structure of the set of target candidates. By using non-local self-similarity (NIBS) as a smooth operator, the proposed method can turn the tracking into sparse representations problems, in which the information of the set of target candidates is exploited. Extensive experimental results on visual tracking have demonstrated the effectiveness of the proposed algorithm. (C) 2013 Elsevier Ltd. All rights reserved.
文献类型: Article
作者关键词: Visual tracking; Sparse representation; Particle filter; Non-local self-similarity
KeyWords Plus: OBJECT TRACKING; REPRESENTATION; ALGORITHM; FEATURES
Web of Science 类别: Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic
研究方向: Computer Science; Engineering
IDS 号: 130BB 
ISSN: 0031-3203 


第 106 条,共 223 条
标题: Biview face recognition in the shape-texture domain 
作者: Xiao, B (Xiao, Bing); Gao, XB (Gao, Xinbo); Tao, DC (Tao, Dacheng); Li, XL (Li, Xuelong)
来源出版物: PATTERN RECOGNITION  卷: 46  期: 7  页: 1906-1919  DOI: 10.1016/j.patcog.2012.12.009  出版年: JUL 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: Face recognition is one of the biometric identification methods with the highest potential. The existing face recognition algorithms relying on the texture information of face images are affected greatly by the variation of expression, scale and illumination. Whereas the algorithms based on the shape topology weaken the influence of illumination to some extent, but the impact of expression, scale and illumination on face recognition is still unsolved. To this end, we propose a new method for face recognition by integrating texture information with shape information, called biview face recognition algorithm. The texture models are constructed by using subspace learning methods and shape topologies are formed by building graphs for face images. The proposed biview face recognition method is compared with recognition algorithms merely based on texture or shape information. Experimental results of recognizing faces under the variation of illumination, expression and scale demonstrate that the performance of the proposed biview face recognition outperforms texture-based and shape-based algorithms. (C) 2012 Elsevier Ltd. All rights reserved.
文献类型: Article
作者关键词: Face recognition; Texture model; Shape topology; Graph edit distance; Active appearance model
KeyWords Plus: GRAPH EDIT DISTANCE; TENSOR DISCRIMINANT-ANALYSIS; ACTIVE APPEARANCE MODELS; SUBSPACE SELECTION; COMPONENT ANALYSIS; PROJECTIONS; EIGENFACES; ALGORITHMS
Web of Science 类别: Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic
研究方向: Computer Science; Engineering
IDS 号: 130BB 
ISSN: 0031-3203 


第 107 条,共 223 条
标题: Wedge-plate shear for focus-shifting testing in single-shot laser system 
作者: Zhao, JN (Zhao, Juanning); Dong, XN (Dong, Xiaona); Gao, LM (Gao, Limin); Li, HG (Li, Hongguang)
来源出版物: APPLIED OPTICS  卷: 52  期: 18  页: 4237-4241  DOI: 10.1364/AO.52.004237  出版年: JUN 20 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: A method using a wedge-plate shear shifting system with adjustable accuracy and measuring range is proposed for measuring the focus shifting caused by thermal distortion in a single-shot laser system. Two beam splitter groups are used in this method to precisely split a single beam into multiple beams with different optical path difference. The focus shifting is determined by position change of the minimum spot on the detector. This method is convenient and economic, especially as it powerfully solves the problem of catching focus shifting in an ultrashort time. (C) 2013 Optical Society of America
PubMed ID: 23842165 
文献类型: Article
KeyWords Plus: FOCAL-LENGTH; TALBOT INTERFEROMETRY; HIGH-POWER; MOIRE TECHNIQUE; LENS; WINDOWS
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 168LX 
ISSN: 1559-128X 


第 108 条,共 223 条
标题: Image fusion of tempo-spatially modulated polarization interference imaging spectrometer 
作者: Zhang, CM (Zhang, Chunmin); Cao, QZ (Cao, Qizhi); Jian, XH (Jian, Xiaohua); Ren, WY (Ren, Wenyi); Zhang, J (Zhang, Jing)
来源出版物: OPTICS COMMUNICATIONS  卷: 297  页: 12-19  DOI: 10.1016/j.optcom.2013.01.041  出版年: JUN 15 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: The space-based tempo-spatially modulated polarization interferometer imaging spectrometer (TSMPIIS) scans over an observed area, and acquires the image-spectrum data cubic consisting of a series of the CCD images taken at different times. Every pixel on the CCD image records interferographs with different optical path differences, corresponding to the incident angles changing from maximum, via zero, and finally to negative maximum. To improve the spatial resolution of the color comprised image acquired by TSMPIIS, the panchromatic (PAN) image of high spatial resolution is fused with the color composite image of high spectrum resolution to produce the fused image of both high spatial and spectrum resolution. Based on the characteristics of the TSMPIIS image data, the FFT (fast Fourier transform)-enhanced IHS (intensity-hue-saturation) transform method is used and compared with IHS and WT (wave transform) methods. The experimental results show that the FFT-enhanced IHS method can establish very good trade-off between spatial and spectral quality of the fused image and largely improve the spatial resolution of the color composite image. The fusion method significantly enhances the instrument performance at very low cost. (C) 2013 Elsevier B.V. All rights reserved.
文献类型: Article
作者关键词: Spectrometer; Fusion; Filter
KeyWords Plus: WAVELET TRANSFORM
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 133JS 
ISSN: 0030-4018 


第 109 条,共 223 条
标题: Coexistence and evolution of bright pulses and dark solitons in a fiber laser 
作者: Wang, LR (Wang, Leiran)
来源出版物: OPTICS COMMUNICATIONS  卷: 297  页: 129-132  DOI: 10.1016/j.optcom.2013.02.009  出版年: JUN 15 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: Bright pulses and dark solitons coexisting and evolving in a fiber laser with strong normal dispersion have been observed. Experimental results show that there exists a transitional pulse regime with the pulse duty cycle of similar to 0.5 that connects the bright pulse and dark soliton regimes. On adjusting polarization states and pump power, the duty cycle of pulses varies so that the laser emits bright, transitional, and dark pulses alternately. It is found that dark solitons are composed of two antiphase square pulses with very large durations and duty cycles. The experimental observations reveal that the bright and dark solitons are not completely isolated from each other. This work could provide a new perspective to the understanding of bright and dark soliton formations as well as their transformations. (C) 2013 Elsevier B.V. All rights reserved.
文献类型: Article
作者关键词: Fiber laser; Mode locking; Dark soliton; Dispersion; Polarization
KeyWords Plus: PHOTONIC CRYSTAL FIBER; ERBIUM-DOPED FIBER; NET-NORMAL-DISPERSION; DISSIPATIVE SOLITONS; BRAGG GRATINGS; POLARIZATION; TRANSFORMATION; OSCILLATOR; GENERATION; ENERGY
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 133JS 
ISSN: 0030-4018 


第 110 条,共 223 条
标题: All-optical EIT-like phenomenon in plasmonic stub waveguide with ring resonator 
作者: Cui, YD (Cui, Yudong); Zeng, C (Zeng, Chao)
来源出版物: OPTICS COMMUNICATIONS  卷: 297  页: 190-193  DOI: 10.1016/j.optcom.2013.01.061  出版年: JUN 15 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: An optical phenomenon analogous to electromagnetically induced transparency (EIT) has been proposed and investigated, numerically in a plasmonic system, which is composed of a single stub-shaped metal-insulator-metal (MIM) waveguide coupled with a ring resonator. The transmission properties of the system are simulated by the finite-difference time-domain (FDTD) method. The bandwidth of the EIT-like spectrum is mainly dependent on the coupling distance between the stub and ring resonator. The red-shift of Err-like peak is nearly linearly proportional to the increase in the radius and the refractive index of ring resonator, as is confirmed by the theoretical calculations. Our compact plasmonic structure may find potential applications in highly integrated optical circuits, such as nanoscale filters and optical switching. (C) 2013 Elsevier B.V. All rights reserved.
文献类型: Article
作者关键词: Surface plasmons; Optical resonator; Electromagnetically induced transparency
KeyWords Plus: INDUCED TRANSPARENCY; NANODISK RESONATORS; BISTABILITY; NANOCAVITIES; REFLECTION; ABSORPTION; POLARITON; FILTERS; LIGHT
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 133JS 
ISSN: 0030-4018 


第 111 条,共 223 条
标题: Dispersion imaging spectrometer for detecting and locating energetic targets in real time 
作者: Yang, QH (Yang, Qinghua); Zeng, XD (Zeng, Xiaodong); Zhao, BC (Zhao, Baochang)
来源出版物: CHINESE OPTICS LETTERS  卷: 11  期: 6  文献号: 061202  DOI: 10.3788/COL201311.061202  出版年: JUN 10 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: A conceptual dispersion imaging spectrometer (DIS) is proposed. It consists of a telescope, four prisms, an imaging lens, and a detector. The first prism allows only the first set of wavelengths along the first direction to pass and disperse. The second prism allows only the second set of wavelengths along the second direction, which is perpendicular to the first. The third and fourth prisms are used to compensate for the angular deviations from the optical axes of the first and second prisms, respectively. The proposed DIS disperses the spectra of a target to form an L-shaped dispersion pattern (LDP). The theoretical calculation and numerical simulation of the LDP are presented. The DIS can locate multiple targets based only on data obtained from a single frame. It is suitable for detecting and locating energetic targets in real time.
文献类型: Article
KeyWords Plus: MICHELSON INTERFEROMETER; MIRROR; PRINCIPLE; IMAGER
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 172SV 
ISSN: 1671-7694 


第 112 条,共 223 条
标题: Synthesis of a terpolymer containing fluorene, side chain conjugated thiophene and benzothiadiazole and its applications in photovoltaic devices 
作者: Liu, HL (Liu, Hongli); Qu, B (Qu, Bo); Chen, J (Chen, Jian); Cong, ZY (Cong, Zhiyuan); An, ZW (An, Zhongwei); Gao, C (Gao, Chao); Xiao, LX (Xiao, Lixin); Chen, ZJ (Chen, Zhijian); Gong, QH (Gong, Qihuang)
来源出版物: JOURNAL OF APPLIED POLYMER SCIENCE  卷: 128  期: 5  页: 3250-3255  DOI: 10.1002/app.38528  出版年: JUN 5 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: A terpolymer (POTVTh-8FO-DBT) containing fluorene, side chain conjugated thiophene and 4,7-dithieny-2,1,3-benzothiadiazole was synthesized by palladium-catalyzed Suzuki coupling method. The polymer is soluble in common organic solvents. The thermal, absorption, and electrochemical properties of the polymer were examined. Photovoltaic properties of POTVTh-8FO-DBT were studied by fabricating the polymer solar cells (PSCs) based on POTVTh-8FO-DBT as donor and [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) as acceptor. With the weight ratio of POTVTh-8FO-DBT : PC61BM of 1 : 1 and the active layer thickness of 80 nm, the power conversion efficiency (PCE) of the device reached 0.47% with Voc = 0.61 V, Jsc = 1.61 mA/cm2, and filled factor (FF) = 0.49 under the illumination of AM 1.5, 100 mW/cm2. The results indicated that this polymer was promising donor candidates in the application of PSCs. (c) 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
文献类型: Article
作者关键词: copolymers; optical and photovoltaic applications; synthesis and processing
KeyWords Plus: POLYMER SOLAR-CELLS; OPEN-CIRCUIT VOLTAGE; LOW-BANDGAP POLYMER; TANDEM POLYMER; DONOR; EFFICIENCY; POLYTHIOPHENES; ENHANCEMENT; COPOLYMERS
Web of Science 类别: Polymer Science
研究方向: Polymer Science
IDS 号: 103IW 
ISSN: 0021-8995 


第 113 条,共 223 条
标题: Optical bistability in subwavelength compound metallic grating 
作者: Lu, H (Lu, H.); Liu, XM (Liu, X. M.)
来源出版物: OPTICS EXPRESS  卷: 21  期: 11  页: 13794-13799  DOI: 10.1364/OE.21.013794  出版年: JUN 3 2013  
Web of Science 核心合集中的 "被引频次": 2 
被引频次合计: 2 
摘要: We have investigated the optical bistability behavior based on an electromagnetically induced reflection (EIR) effect in a compound metallic grating consisting of subwavelength slits and Kerr nonlinear nanocavities embedded in a metallic film. The theoretical and simulation results show that a narrow peak in the broad reflection dip possesses a red-shift with increasing the refractive index of coupled nanocavities. Importantly, we have obtained an obvious optical bistability with threshold intensity about ten times lower than that of metallic grating coated by nonlinear material. The results indicate that our structure may find excellent applications for nonlinear plasmonic devices, especially optical switches and modulators. (C) 2013 Optical Society of America
PubMed ID: 23736633 
文献类型: Article
KeyWords Plus: PLASMONIC WAVE-GUIDE; ELECTROMAGNETICALLY INDUCED TRANSPARENCY; COUPLED RESONATORS; FANO RESONANCE; PROPAGATION; ANALOG
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 156II 
ISSN: 1094-4087 


第 114 条,共 223 条
标题: Research of X-ray pulsar navigation simulation source 
作者: Sheng, LZ (Sheng Li-Zhi); Zhao, BS (Zhao Bao-Sheng); Wu, JJ (Wu Jian-Jun); Zhou, F (Zhou Feng); Song, J (Song Juan); Liu, YA (Liu Yong-An); Shen, JS (Shen Jing-Shi); Yan, QR (Yan Qiu-Rong); Deng, NQ (Deng Ning-Qin); Hu, HJ (Hu Hui-Jun)
来源出版物: ACTA PHYSICA SINICA  卷: 62  期: 12  文献号: 129702  DOI: 10.7498/aps.62.129702  出版年: JUN 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: As an autonomous navigation method, X-ray pulsar navigation can provide position, timing and attitude information for various spacecrafts. Since the X-rays (1-20 keV) from the pulsar can not penetrate the earth atmosphere, an X-ray source in laboratory needs to be set up to test and calibrate the detector. In this paper an arbitrary X-ray pulse source to simulate the neutron pulsar signal is proposed. The main components of the simulation source are a grid controlled X-ray tube and arbitrary pulse generation electronics. With the arbitrary pulse voltage applied to the tube grid, the X-ray intensity is controlled. Through electron optics design, the tube electrode parameters are optimized A grid controlled X-ray tube is fabricated and tested. Using a micro-channel plate detector to detect and reconstruct the generated X-ray pulses, the similarity between the accumulated profile and the original pulsar profile is better than 95%. The frequency stability of the pulsar source emulator is about 2 x 10(-11).
文献类型: Article
作者关键词: X-ray pulsar navigation; X-ray tube; grid control
KeyWords Plus: SPACE-CHARGE
Web of Science 类别: Physics, Multidisciplinary
研究方向: Physics
IDS 号: 174VU 
ISSN: 1000-3290 


第 115 条,共 223 条
标题: An analog modulated simulation source for X-ray pulsar-based navigation 
作者: Zhou, F (Zhou Feng); Wu, GM (Wu Guang-Min); Zhao, BS (Zhao Bao-Sheng); Sheng, LZ (Sheng Li-Zhi); Song, J (Song Juan); Liu, YA (Liu Yong-An); Yan, QR (Yan Qiu-Rong); Deng, NQ (Deng Ning-Qin); Zhao, JJ (Zhao Jian-Jun)
来源出版物: ACTA PHYSICA SINICA  卷: 62  期: 11  文献号: 119701  DOI: 10.7498/aps.62.119701  出版年: JUN 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: In this paper a high resolution X-ray simulation source is proposed and designed to verify the navigation based on X-ray pulsar in the simulation experience system. The simulation source consists of an arbitrary signal generator and a grid controlled X-ray tube. According to the grid tube's characteristic curve, the data of the pulsar standard pulse template are converted. Then using the method of direct digital frequency synthesis, the converted data are synthesized to waveforms, called the analog modulated grid voltage. In the grid controlled X-ray tube, the grid voltage changes the number of electrons hitting on the target and controls the X-ray intensity. With an analog modulated pulse profile applied on the tube grid electrode, the tube will emit X-rays which will match photons' statistical distribution and simulate the X-ray pulsar profile extremely well. The properties of Crab pulsar simulation source are tested in X-ray pulsar navigation simulation experience system. The results of the test are as follows: Comparing the tested pulse profile with the standard pulsar profile, we have time correlation coefficient is 0.9774, and frequency correlation coefficient is 0.9853. The X-ray photon flux is 1.90 ph.cm(-2).s(-1), the pulsed fraction is 76.15%, and the half-width half maximum is 1.879 ms. These results show that the X-ray simulation source has several merits, such as: strong ability to simulate the X-ray, low cost and simple operation. So it is an important means for the improvement of X-ray pulsar navigation.
文献类型: Article
作者关键词: X-ray pulsar navigation; simulated source; grid controlled X-ray tube; direct digital frequency synthesis (DDS)
Web of Science 类别: Physics, Multidisciplinary
研究方向: Physics
IDS 号: 162DH 
ISSN: 1000-3290 


第 116 条,共 223 条
标题: Investigation of mid-IR luminescence properties and energy transfer in Dy3+-doped and Dy3+, Tm3+-codoped chalcohalide glasses 
作者: Meng, W (Meng, Wei); Xu, YT (Xu, Yantao); Guo, HT (Guo, Haitao); Lu, CF (Lu, Chunfeng); Hou, CQ (Hou, Chaoqi); Lu, M (Lu, Min); Wang, RF (Wang, Rengfei); Li, WN (Li, Weinan); Peng, B (Peng, Bo); Lu, YQ (Lu, Yunqing); Wei, W (Wei, Wei)
来源出版物: OPTICAL MATERIALS  卷: 35  期: 8  页: 1499-1503  DOI: 10.1016/j.optmat.2013.03.007  出版年: JUN 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: A series of Dy3+-doped and Dy3+/Tm3+-codoped chalcohalide glasses (72GeS(2)center dot 18Ga(2)S(3)center dot 10Agl) were prepared. The optical properties of the glasses, including Judd-Ofelt strength parameters, transition probabilities, excited state lifetimes, fluorescence branching ratios and emission cross-sections were calculated based on the absorption and emission spectra. For the Dy3+-doped glasses, the emission intensity at 1330 nm increases obviously with increasing of Dy3+ doping content from 0.2 to 0.5 wt.%, and the fluorescence lifetimes keep at 40 us. The emission cross-section of the Dy3+-doped glass (0.5 wt.%) was calculated to be 4.16 x 10(-20) cm(2). For the Dy3+/Tm3+-codoped glasses, Tm3+ ions can absorb excitation energy and effectively transfer energy to Dy3+ ions. The intensified mid-IR emissions were observed obviously, the emission cross-sections for the codoped glasses (0.8 wt.% Dy3+ and 0.5 wt.% Tm3+ were calculated to be 1.40 x 10(-20) cm(2) at 2900 nm and 1.52 x 10(-20) cm(2) at 4300 nm, respectively. (c) 2013 Elsevier B.V. All rights reserved.
文献类型: Article
作者关键词: Mid-IR laser; Fluorescence; Chalcohalide glass; Rare earth
KeyWords Plus: GE-AS(OR GA)-S GLASSES; MU-M; EMISSION; ABSORPTION; LASER; SPECTROSCOPY; TM3+
Web of Science 类别: Materials Science, Multidisciplinary; Optics
研究方向: Materials Science; Optics
IDS 号: 168DK 
ISSN: 0925-3467 


第 117 条,共 223 条
标题: One-Step Preparation and Fluorescence Enhancement Effect in SiO2/Eu2+ Doped with Ag Nanowires 
作者: Zhang, DK (Zhang, Dekai); Hu, XY (Hu, Xiaoyun); Liu, EZ (Liu, Enzhou); Ji, RN (Ji, Ruonan); Zhan, SC (Zhan, Suchang); Jing, GY (Jing, Guangyin); Fan, J (Fan, Jun); Hou, X (Hou, Xun)
来源出版物: PLASMONICS  卷: 8  期: 2  页: 969-974  DOI: 10.1007/s11468-013-9498-x  出版年: JUN 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: Eu2+ single-doped SiO2 (SiO2/Eu2+) and Eu2+, Ag nanowires co-doped SiO2 (SiO2/Eu2+-Ag) luminescent nanomaterials were prepared by an efficient one-step sol-gel method. Their microstructure and optical properties were characterized, and the fluorescence enhancement of Eu2+ by Ag nanowires was investigated. The experimental results indicate that the average diameter of Ag nanowires doped is 12.5 nm, and the length-diameter ratio is 30. The Ag nanowires cannot only enhance the light absorption of SiO2/Eu2+ in the range of 230-350 nm, but also reduce the fluorescence lifetime of Eu2+. More importantly, the emission intensity is enhanced after doping Ag nanowires, and the red shift phenomenon of the emission spectrum is observed, red shift occurs between 10 and 56 nm. The highest fluorescence intensity is accessed under the Ag doping concentration of 0.10 %. Additionally, the emission of SiO2/Eu2+ with 0.10 % of Ag doping at 456 nm is 16 times stronger than that of pure SiO2/Eu2+. The present results indicate that the fluorescence enhancement is attributed to the local field enhancement and the increased radiative decay rates induced by Ag nanowires.
文献类型: Article
作者关键词: Rare earth doping; Localized surface plasmon resonance; Radiative decay rates; Luminescence; Ag nanowires
KeyWords Plus: SURFACE-PLASMON RESONANCE; OPTICAL-PROPERTIES; SILVER NANOPARTICLES; ENERGY-TRANSFER; NANOSTRUCTURES; INTENSITY; SIZE; FLUOROPHORES; LUMINESCENCE; DEPENDENCE
Web of Science 类别: Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
研究方向: Chemistry; Science & Technology - Other Topics; Materials Science
IDS 号: 164XN 
ISSN: 1557-1955 


第 118 条,共 223 条
标题: Highly efficient pulse cleaner via nonlinear ellipse rotation in liquid CS2 for ultrashort pulses 
作者: Liu, HJ (Liu, H. J.); Sun, QB (Sun, Q. B.); Huang, N (Huang, N.); Wen, J (Wen, J.); Wang, ZL (Wang, Z. L.)
来源出版物: OPTICS LETTERS  卷: 38  期: 11  页: 1838-1840  DOI: 10.1364/OL.38.001838  出版年: JUN 1 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: A highly efficient pulse cleaner based on nonlinear ellipse rotation (NER) in a liquid medium of CS2 is investigated for the temporal contrast enhancement of ultrashort pulses. In theory, a nonlinear transmissivity higher than 60% can be achieved with the temporal contrast improved by about four orders of magnitude, on the condition that the extinction ratio of the polarizer-analyzer pair is better than 10(4). In a proof of principle experiment, the cleaned pulses at the mJ level with total transmissivity as high as 30% are obtained via NER, in which the temporal contrast is enhanced by about three orders of magnitude. This provides a simple and feasible technology for improving the temporal contrast of an ultrashort and ultraintense laser system in the future. (C) 2013 Optical Society of America
PubMed ID: 23722761 
文献类型: Article
KeyWords Plus: TEMPORAL CONTRAST ENHANCEMENT; POLARIZED WAVE GENERATION; FEMTOSECOND PULSES; FIBERS; LASERS; GATE
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 156IL 
ISSN: 0146-9592 


第 119 条,共 223 条
标题: Large mode area waveguides with polarization functions by volume ultrafast laser photoinscription of fused silica 
作者: Cheng, G (Cheng, G.); D'Amico, C (D'Amico, C.); Liu, X (Liu, X.); Stoian, R (Stoian, R.)
来源出版物: OPTICS LETTERS  卷: 38  期: 11  页: 1924-1926  DOI: 10.1364/OL.38.001924  出版年: JUN 1 2013  
Web of Science 核心合集中的 "被引频次": 3 
被引频次合计: 3 
摘要: We present optical designs allowing large mode area light guiding by ultrafast laser photoinscription of bulk fused silica. If usual concepts are based on large core and depressed cladding, evanescently coupled multicore wave-guides with coherent mode superposition can be effective solutions, where the introduction of nanostructured defects determines additional polarization functions. (C) 2013 Optical Society of America
PubMed ID: 23722791 
文献类型: Article
KeyWords Plus: FEMTOSECOND LASER; FIBER; GLASS; PULSES
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 156IL 
ISSN: 0146-9592 


第 120 条,共 223 条
标题: Approach for differential phase contrast imaging in x-ray microscopy 
作者: Liu, ZW (Liu, Zhenwei); Lin, DY (Lin, Danying); Huang, JH (Huang, Jianheng); Niu, HB (Niu, Hanben)
来源出版物: OPTICS LETTERS  卷: 38  期: 11  页: 1990-1992  DOI: 10.1364/OL.38.001990  出版年: JUN 1 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: We propose a differential phase contrast imaging method in x-ray microscopy by utilizing a biased derivative filter, which is structurally similar to that used in visible optics, except that phase changes by the filter cannot be ignored in the x-ray range. However, it is demonstrated that the filter's phase retardation does not disturb its function of phase contrast imaging, and even enhances the signals to some extent. Theoretical formulations and corresponding numerical simulations show that the approach is capable of performing characteristic differential microscopic phase imaging with nanometer-scale resolution. Manageable parameters are also examined in detail for pursuing a high image quality. (C) 2013 Optical Society of America
PubMed ID: 23722813 
文献类型: Article
KeyWords Plus: VISUALIZATION; OBJECTS
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 156IL 
ISSN: 0146-9592 


第 121 条,共 223 条
标题: A passively Q-switched Yb:YAG laser with a single-walled carbon nanotube saturable absorber 
作者: Chu, HW (Chu, Hongwei); Zhao, SZ (Zhao, Shengzhi); Yang, KJ (Yang, Kejian); Li, YF (Li, Yuefei); Li, DC (Li, Dechun); Li, GQ (Li, Guiqiu); Zhao, J (Zhao, Jia); Xu, XD (Xu, Xiaodong); Di, JQ (Di, Juqing); Zheng, LH (Zheng, Lihe); Xu, J (Xu, Jun); Wang, YG (Wang, Yonggang)
来源出版物: LASER PHYSICS  卷: 23  期: 6  文献号: 065002  DOI: 10.1088/1054-660X/23/6/065002  出版年: JUN 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: A diode-end-pumped passively Q-switched Yb:YAG bulk laser with a single-walled carbon nanotube saturable absorber is presented. A maximum output power of 715 mW has been obtained with a slope efficiency of 15.7%. The minimum pulse width of 88 ns was achieved at a repetition rate of 175 kHz, corresponding to a pulse energy of 4.1 mu J and a peak power of 46.2 W.
文献类型: Article
KeyWords Plus: YB-YAG LASER; DOPED FIBER LASER; MODE-LOCKING; MU-M; GAAS
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 151KB 
ISSN: 1054-660X 


第 122 条,共 223 条
标题: An Yb3+-doped Lu2SiO5 mode-locked laser using a reflective graphene oxide absorber 
作者: Feng, C (Feng, Chao); Liu, J (Liu, Jie); Wang, YG (Wang, Yonggang); Zheng, LH (Zheng, Lihe); Su, LB (Su, Liangbi); Xu, J (Xu, Jun)
来源出版物: LASER PHYSICS  卷: 23  期: 6  文献号: 065802  DOI: 10.1088/1054-660X/23/6/065802  出版年: JUN 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: Reflective graphene oxide played the part of the saturable absorber to achieve a continuous wave mode-locking (CWML) laser based on Yb3+:Lu2SiO5 (Yb:LSO) crystal for the first time. The laser operated at a repetition frequency of 87 MHz at a maximum average output power of 0.95 W with a single pulse energy of 10.9 nJ. A 9.8 ps ultra-short pulse was yielded at 1058 nm with a full width at half maximum (FWHM) of 2.09 nm, corresponding to a peak power of 1.11 kW.
文献类型: Article
KeyWords Plus: MU-M; SATURABLE ABSORBER; FEMTOSECOND LASER; POWER; PHOTONICS; CRYSTALS; LOCKING
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 151KB 
ISSN: 1054-660X 
电子 ISSN: 1555-6611 


第 123 条,共 223 条
标题: Hessian Regularized Support Vector Machines for Mobile Image Annotation on the Cloud 
作者: Tao, DP (Tao, Dapeng); Jin, LW (Jin, Lianwen); Liu, WF (Liu, Weifeng); Li, XL (Li, Xuelong)
来源出版物: IEEE TRANSACTIONS ON MULTIMEDIA  卷: 15  期: 4  页: 833-844  DOI: 10.1109/TMM.2013.2238909  出版年: JUN 2013  
Web of Science 核心合集中的 "被引频次": 9 
被引频次合计: 9 
摘要: With the rapid development of the cloud computing and mobile service, users expect a better experience through multimedia computing, such as automatic or semi-automatic personal image and video organization and intelligent user interface. These functions heavily depend on the success of image understanding, and thus large-scale image annotation has received intensive attention in recent years. The collaboration between mobile and cloud opens a new avenue for image annotation, because the heavy computation can be transferred to the cloud for immediately responding user actions. In this paper, we present a scheme for image annotation on the cloud, which transmits mobile images compressed by Hamming compressed sensing to the cloud and conducts semantic annotation through a novel Hessian regularized support vector machine on the cloud. We carefully explained the rationality of Hessian regularization for encoding the local geometry of the compact support of the marginal distribution and proved that Hessian regularized support vector machine in the reproducing kernel Hilbert space is equivalent to conduct Hessian regularized support vector machine in the space spanned by the principal components of the kernel principal component analysis. We conducted experiments on the PASCAL VOC'07 dataset and demonstrated the effectiveness of Hessian regularized support vector machine for large-scale image annotation.
文献类型: Article
作者关键词: Cloud computing; Hessian Eigenmaps and support vector machines; manifold regularization; mobile service
KeyWords Plus: NONLINEAR DIMENSIONALITY REDUCTION; RELEVANCE-FEEDBACK; MANIFOLD REGULARIZATION; DISCRIMINANT-ANALYSIS; GEOMETRIC FRAMEWORK; VISUAL-SEARCH; RETRIEVAL; RECOGNITION; SUBSPACE; PRESERVATION
Web of Science 类别: Computer Science, Information Systems; Computer Science, Software Engineering; Telecommunications
研究方向: Computer Science; Telecommunications
IDS 号: 148FK 
ISSN: 1520-9210 


第 124 条,共 223 条
标题: Ultra-short pulse laser deep drilling of C/SiC composites in air 
作者: Wang, CH (Wang, Chunhui); Zhang, LT (Zhang, Litong); Liu, YS (Liu, Yongsheng); Cheng, GH (Cheng, Guanghua); Zhang, Q (Zhang, Qing); Hua, K (Hua, Ke)
来源出版物: APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING  卷: 111  期: 4  页: 1213-1219  DOI: 10.1007/s00339-012-7377-5  出版年: JUN 2013  
Web of Science 核心合集中的 "被引频次": 2 
被引频次合计: 2 
摘要: Ultra-short pulse laser machining is an important finishing technology for high hardness materials. In this study, it demonstrated that the ultra-short pulse laser can be used to drill the film cooling holes and square holes in aero-engine turbine blades made of C/SiC composites. Both the edges and bottoms of the drilling holes are covered with small particles. The following factors have a great effect on drilling holes according to this work: (1) circular holes can be processed only at a relative small helical lines spacing. (2) With the increase of laser scanning speed, the depth of holes reduces while the diameter rarely changes. (3) Through the holes of high aspect ratio can be obtained via high processing power.
文献类型: Article
KeyWords Plus: FEMTOSECOND LASER; PATTERN-FORMATION; ABLATION; METALS; TARGETS; SILICON; BULK
Web of Science 类别: Materials Science, Multidisciplinary; Physics, Applied
研究方向: Materials Science; Physics
IDS 号: 146CM 
ISSN: 0947-8396 


第 125 条,共 223 条
标题: Error Analysis of Stochastic Gradient Descent Ranking 
作者: Chen, H (Chen, Hong); Tang, Y (Tang, Yi); Li, LQ (Li, Luoqing); Yuan, Y (Yuan, Yuan); Li, XL (Li, Xuelong); Tang, YY (Tang, Yuanyan)
来源出版物: IEEE TRANSACTIONS ON CYBERNETICS  卷: 43  期: 3  页: 898-909  DOI: 10.1109/TSMCB.2012.2217957  出版年: JUN 2013  
Web of Science 核心合集中的 "被引频次": 2 
被引频次合计: 2 
摘要: Ranking is always an important task in machine learning and information retrieval, e.g., collaborative filtering, recommender systems, drug discovery, etc. A kernel-based stochastic gradient descent algorithm with the least squares loss is proposed for ranking in this paper. The implementation of this algorithm is simple, and an expression of the solution is derived via a sampling operator and an integral operator. An explicit convergence rate for leaning a ranking function is given in terms of the suitable choices of the step size and the regularization parameter. The analysis technique used here is capacity independent and is novel in error analysis of ranking learning. Experimental results on real-world data have shown the effectiveness of the proposed algorithm in ranking tasks, which verifies the theoretical analysis in ranking error.
PubMed ID: 24083315 
文献类型: Article
作者关键词: Error analysis; integral operator; ranking; reproducing kernel Hilbert space; sampling operator; stochastic gradient descent
KeyWords Plus: SUPPORT VECTOR MACHINES; GENERALIZATION BOUNDS; RELEVANCE-FEEDBACK; IMAGE RETRIEVAL; LEARNING-THEORY; ALGORITHM; CLASSIFICATION; REGRESSION; KERNEL
Web of Science 类别: Computer Science, Artificial Intelligence; Computer Science, Cybernetics
研究方向: Computer Science
IDS 号: 145IY 
ISSN: 2168-2267 
电子 ISSN: 2168-2275 


第 126 条,共 223 条
标题: Localized surface waves at the interfzace between a linear dielectric and a photovoltaic-photorefractive crystal 
作者: Li, KH (Li, Kehao); Lu, KQ (Lu, Keqing); Zhang, YQ (Zhang, Yiqi); Niu, PJ (Niu, Pingjuan); Yu, LY (Yu, Liyuan); Zhang, YP (Zhang, Yanpeng)
来源出版物: OPTICS AND LASER TECHNOLOGY  卷: 48  页: 79-82  DOI: 10.1016/j.optlastec.2012.09.021  出版年: JUN 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: We study localized surface waves at the interface between a linear dielectric and a photovoltaic photorefractive (PP) crystal. These localized surface waves can be established provided that 0 > delta-b > -alpha/2, where delta is the guiding parameter, b is the propagation constant, and alpha is the parameter related to the wavelength and the PP crystal. We show that when delta > 0, the part of the energy concentrated in the PP crystal is always higher than that in the linear dielectric and that when delta < 0, the part of the energy concentrated in the linear dielectric decreases with an increase in b. We find that the part of the energy concentrated in the linear dielectric for delta < 0 is bigger than that for delta > 0. Crown Copyright (C) 2012 Published by Elsevier Ltd. All rights reserved.
文献类型: Article
作者关键词: Surface waves; Photorefractive nonlinearity; Nonlinear optics
KeyWords Plus: SPATIAL SOLITONS; SCREENING SOLITONS; BRIGHT; DARK; MEDIA
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 137RA 
ISSN: 0030-3992 


第 127 条,共 223 条
标题: Monomode optical planar and channel waveguides in Yb3+-doped silicate glasses formed by helium ion implantation (vol 44, pg 2323, 2012) 
作者: Liu, CX (Liu, Chun-Xiao); Cheng, S (Cheng, Shu); Zhao, JH (Zhao, Jin-Hua); Li, WN (Li, Wei-Nan); Wei, W (Wei, Wei); Peng, B (Peng, Bo)
来源出版物: OPTICS AND LASER TECHNOLOGY  卷: 48  页: 611-611  DOI: 10.1016/j.optlastec.2012.12.014  出版年: JUN 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
文献类型: Correction
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 137RA 
ISSN: 0030-3992 


第 128 条,共 223 条
标题: Sparse Coding from a Bayesian Perspective 
作者: Lu, XQ (Lu, Xiaoqiang); Wang, YL (Wang, Yulong); Yuan, Y (Yuan, Yuan)
来源出版物: IEEE TRANSACTIONS ON NEURAL NETWORKS AND LEARNING SYSTEMS  卷: 24  期: 6  页: 929-939  DOI: 10.1109/TNNLS.2013.2245914  出版年: JUN 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: Sparse coding is a promising theme in computer vision. Most of the existing sparse coding methods are based on either l(0) or l(1) penalty, which often leads to unstable solution or biased estimation. This is because of the nonconvexity and discontinuity of the l(0) penalty and the over-penalization on the true large coefficients of the l(1) penalty. In this paper, sparse coding is interpreted from a novel Bayesian perspective, which results in a new objective function through maximum a posteriori estimation. The obtained solution of the objective function can generate more stable results than the l(0) penalty and smaller reconstruction errors than the l(1) penalty. In addition, the convergence property of the proposed algorithm for sparse coding is also established. The experiments on applications in single image super-resolution and visual tracking demonstrate that the proposed method is more effective than other state-of-the-art methods.
PubMed ID: 24808474 
文献类型: Article
作者关键词: Bayesian; compressive sensing (CS); computer vision; maximum a posteriori (MAP); sparse coding
KeyWords Plus: VARIABLE SELECTION; REPRESENTATION; REGRESSION; LASSO; DICTIONARIES; RECOGNITION; TRACKING; MODEL
Web of Science 类别: Computer Science, Artificial Intelligence; Computer Science, Hardware & Architecture; Computer Science, Theory & Methods; Engineering, Electrical & Electronic
研究方向: Computer Science; Engineering
IDS 号: 128RH 
ISSN: 2162-237X 


第 129 条,共 223 条
标题: The generation of dissipative solitons in an all-fiber passively mode-locked laser based on semiconduct type of carbon nanotubes absorber 
作者: Liu, XL (Liu, Xianglian); Wang, YG (Wang, Yonggang); Li, XH (Li, Xiaohui); Wang, YS (Wang, Yishan); Zhao, W (Zhao, Wei); Hu, XH (Hu, Xiaohong); Zhang, W (Zhang, Wei); Wang, HS (Wang, Hushan); Yang, Z (Yang, Zhi); Shen, DY (Shen, Deyuan); Li, C (Li, Cheng); Chen, GD (Chen, Guangde); Tsang, YH (Tsang, Yuen Hong)
来源出版物: OPTICAL FIBER TECHNOLOGY  卷: 19  期: 3  页: 200-205  DOI: 10.1016/j.yofte.2013.01.007  出版年: JUN 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: We report theoretically and experimentally on the formation and compensation of dissipative soliton (DS) in an all-normal dispersion fiber laser mode locked with semiconductor type of carbon nanotubes (CNTs) absorber fabricated by vertical evaporation method. The pulses with bandwidth of 2.2 nm and duration of 11.7 ps are obtained at 1051 nm. The DS is linearly chirped and can be compressed to 1.8 ps by a grating pair. By this method the carbon nanotubes absorbers is can be mass produced cost effectively and easier to control the absorber parameters, e. g. initial transmission of the absorber, therefore this method is more suitable to be industrialized. (C) 2013 Elsevier Inc. All rights reserved.
文献类型: Article
作者关键词: Semiconductor; Carbon nanotubes; Absorber; Fiber laser; Mode locking
KeyWords Plus: NORMAL-DISPERSION
Web of Science 类别: Engineering, Electrical & Electronic; Optics; Telecommunications
研究方向: Engineering; Optics; Telecommunications
IDS 号: 121VM 
ISSN: 1068-5200 


第 130 条,共 223 条
标题: Parallel on-axis phase-shifting holographic phase microscopy based on reflective point-diffraction interferometer with long-term stability 
作者: Guo, RL (Guo, Rongli); Yao, BL (Yao, Baoli); Gao, P (Gao, Peng); Min, JW (Min, Junwei); Han, J (Han, Jun); Yu, X (Yu, Xun); Lei, M (Lei, Ming); Yan, SH (Yan, Shaohui); Yang, YL (Yang, Yanlong); Dan, D (Dan, Dan); Ye, T (Ye, Tong)
来源出版物: APPLIED OPTICS  卷: 52  期: 15  页: 3484-3489  DOI: 10.1364/AO.52.003484  出版年: MAY 20 2013  
Web of Science 核心合集中的 "被引频次": 3 
被引频次合计: 3 
摘要: Parallel on-axis two-step phase-shifting reflective point-diffraction interferometry for holographic phase microscopy based on Michelson architecture is proposed. A cube beamsplitter splits the object wave into two copies within the two arms. The reference wave is rebuilt by low-pass filtering with a pinhole-masked mirror. Both object and reference waves are split into two beams by a grating in a 4f imaging system; thus, two interferograms with quadrature phase-shift can be acquired simultaneously with the aid of polarization elements. The approach has the merit of nanometers-scale phase stability over hours due to its quasi-common-path geometry. It can make full use of camera spatial bandwidth while its temporal resolution is as fast as the camera frame rate. Phase imaging on microscale specimen is implemented, and the experimental results demonstrate that the proposed approach is suitable for investigating dynamic processes. (C) 2013 Optical Society of America
PubMed ID: 23736233 
文献类型: Article
KeyWords Plus: LIGHT INTERFERENCE MICROSCOPY; DIGITAL HOLOGRAPHY; CONTRAST MICROSCOPY; POLARIZING SEPARATION; LIVING CELLS; SINGLE-SHOT; POLARIZATION; COMPENSATION; INSPECTION; ALGORITHM
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 149SP 
ISSN: 1559-128X 


第 131 条,共 223 条
标题: Crystallization and absorption properties of novel photo-thermal refractive glasses with the addition of B2O3 
作者: Wang, PF (Wang, Pengfei); Lu, M (Lu, Min); Li, WN (Li, Weinan); Gao, F (Gao, Fei); Peng, B (Peng, Bo)
来源出版物: JOURNAL OF NON-CRYSTALLINE SOLIDS  卷: 368  页: 55-62  DOI: 10.1016/j.jnoncrysol.2013.03.002  出版年: MAY 15 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: A new boron-containing photo-thermal-refractive (boron-PTR) glass was prepared by two-step melt-quenching techniques at relative lower glass melting temperature. The influence of Ag+ doping concentration, UV exposure dosage and thermal development parameters on the boron-PTR glass' spectroscopic absorption and crystallization property were investigated and compared with that of the known boron-free VTR glass explored by L B. Glebov et al. The introduction of B2O3, to some extent, can increase the strength of the silicate bonding thus preventing the liquid-liquid phase separation in this new PTR system when compared to the boron-free PTR system. The developed boron-PTR glass with the processing of 15 s-UV exposure and appropriate thermal development (480 degrees C/3 h, 500 degrees C/2 h) exhibits good photo-induced crystallization performance, high VIS-near IR transmittance (670 to 2600 nm) and moderate photo-induced refractive index change (1.1 x 10(-3)), which at present status enables this new PTR glass basic ability to record holographic elements. (C) 2013 Elsevier B.V. All rights reserved.
文献类型: Article
作者关键词: Photo-thermal-refractive glass; UV exposure; Thermal development; Crystallization; Absorption
KeyWords Plus: PHOTOTHERMOREFRACTIVE GLASS; PHASE-SEPARATION; BRAGG GRATINGS; SPECTRA; INDEX
Web of Science 类别: Materials Science, Ceramics; Materials Science, Multidisciplinary
研究方向: Materials Science
IDS 号: 146PT 
ISSN: 0022-3093 
电子 ISSN: 1873-4812 


第 132 条,共 223 条
标题: Broadband, low-loss, dispersion flattened porous-core photonic bandgap fiber for terahertz (THz)-wave propagation 
作者: Liang, J (Liang, Jian); Ren, LY (Ren, Liyong); Chen, NN (Chen, Nana); Zhou, CH (Zhou, Changhe)
来源出版物: OPTICS COMMUNICATIONS  卷: 295  页: 257-261  DOI: 10.1016/j.optcom.2013.01.010  出版年: MAY 15 2013  
Web of Science 核心合集中的 "被引频次": 2 
被引频次合计: 2 
摘要: By intentionally combining the porous fiber and the air-core photonic bandgap fiber, a kind of porous-core photonic bandgap fiber for guiding terahertz (THz) wave is proposed in this paper. THz wave in a frequency range from 0.98 THz to 1.15 THz can be well concentrated in the fiber core region with a low loss. Compared with the air-core photonic bandgap fiber, this kind of fiber can also provide a broader bandwidth and a much more flattened dispersion. Numerical simulations are performed by the plane wave expansion method and the finite element method. (C) 2013 Elsevier B.V. All rights reserved.
文献类型: Article
作者关键词: Photonic bandgap fiber; THz; Porous fiber; Dispersion
KeyWords Plus: WAVE-GUIDE; DIRECTIONAL COUPLER; TRANSMISSION; FABRICATION; SPECTROSCOPY; RADIATION
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 127NA 
ISSN: 0030-4018 


第 133 条,共 223 条
标题: Coherent emission of light using stacked gratings 
作者: Gong, YK (Gong, Yongkang); Liu, XL (Liu, Xianliang); Li, K (Li, Kang); Huang, JG (Huang, Jungang); Martinez, JJ (Martinez, J. J.); Rees-Whippey, D (Rees-Whippey, Daniel); Carver, S (Carver, Sara); Wang, LR (Wang, Leiran); Zhang, WF (Zhang, Wenfu); Duan, T (Duan, Tao); Copner, N (Copner, Nigel)
来源出版物: PHYSICAL REVIEW B  卷: 87  期: 20  文献号: 205121  DOI: 10.1103/PhysRevB.87.205121  出版年: MAY 14 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: The possibility of temporally and spatially coherent thermal emission has been demonstrated utilizing stacked gratings. We demonstrate that the metallic grating with narrow air slit behaves like a homogeneous slab with large permittivity and small permeability and find that the interaction between the metallic grating and the Bragg grating gives rise to impendence matching at wavelengths located in the photonic band gap of the Bragg grating, which enables the stacked gratings to perform high emission with ultranarrow spectrum and antenna-like spatial response. This paves the way towards the design of a novel infrared source platform for applications such as thermal analysis, imaging, security, biosensing, and medical diagnoses.
文献类型: Article
Web of Science 类别: Physics, Condensed Matter
研究方向: Physics
IDS 号: 145YZ 
ISSN: 1098-0121 


第 134 条,共 223 条
标题: The Effect of Additive on the Performance and Phase Separation of Benzo[1,2-b:3,4-b]dithiophene-Based Polymer Heterojunction Photovoltaic Devices 
作者: Ni, N (Ni, Nan); Qu, B (Qu, Bo); Tian, D (Tian, Di); Cong, ZY (Cong, Zhiyuan); Wang, WP (Wang, Weiping); Gao, C (Gao, Chao); Xiao, LX (Xiao, Lixin); Chen, ZJ (Chen, Zhijian); Gong, QH (Gong, Qihuang); Wei, W (Wei, Wei)
来源出版物: MACROMOLECULAR CHEMISTRY AND PHYSICS  卷: 214  期: 9  页: 985-993  DOI: 10.1002/macp.201200565  出版年: MAY 14 2013  
Web of Science 核心合集中的 "被引频次": 2 
被引频次合计: 2 
摘要: An alternating copolymer (PBDTC10DBT) of benzo[1,2-b:3,4-b]dithiophene (BDT) as donor and 4,7-di(3-decylthiophen-2-yl)-2,1,3-benzothiadiazole (C10DBT) as acceptor is designed and synthesized. In order to investigate the effect of the 1,8-diiodooctane (DIO) additive on the morphology and photovoltaic performance, polymer solar cells (PSCs) based on PBDTC10DBT:[6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) are fabricated. The morphology of blend films and the interpenetrating network between the donor and the acceptor is examined using atomic force microscopy and scanning electron microscopy. This work shows that the PBDTC10DBT:PC61BM blend films with added DIO (3%, v/v) have improved absorption and controlled phase separation. Morphology with a domain size of 2030 nm that forms in the DIO system is proposed to facilitate charge transport and minimize charge carrier recombination, which are the main reasons why the power conversion efficiency of the PSCs is improved from 1.93% (without DIO) to 2.23% (with DIO).
文献类型: Article
作者关键词: additives; phase separation; 1; 8-diiodooctane; polymer solar cells
KeyWords Plus: LOW-BANDGAP POLYMER; SOLAR-CELLS; EFFICIENCY; MORPHOLOGY; NETWORK
Web of Science 类别: Polymer Science
研究方向: Polymer Science
IDS 号: 136HV 
ISSN: 1022-1352 


第 135 条,共 223 条
标题: Experimental study on high efficiency of Ti:sapphire laser to single-mode fiber coupling 
作者: Liu, J (Liu, Jia); Fan, WH (Fan, Wenhui)
来源出版物: CHINESE OPTICS LETTERS  卷: 11  期: 5  文献号: 050605  DOI: 10.3788/COL201311.050605  出版年: MAY 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: We experimentally investigate an optimum scheme of coupling a collimated light from a Ti:sapphire laser source into a standard single-mode fiber (SMF). By adjusting the effective numerical aperture (NA) of coupling lens and eliminating the chromatic aberration, a coupling efficiency of around 70% is finally obtained. This result is close to the maximum value predicted by theoretical simulation. It is well demonstrated that high coupling efficiency between Ti:sapphire laser and SMF can also be obtained by optimizing certain parameters of a coupling lens, without employing any special optical components, or the specific fiber with complex structure.
文献类型: Article
KeyWords Plus: DIODE; LENS; COMMUNICATION; SYSTEMS; LIGHT; LIDAR; WAVE
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 175JD 
ISSN: 1671-7694 


第 136 条,共 223 条
标题: Low-repetition rate, nanosecond, high-power pulse amplifier system based on Yb-doped rod-type fiber 
作者: Yu, J (Yu, Jia); Zhao, W (Zhao, Wei); Wang, YS (Wang, Yishan); Yang, Z (Yang, Zhi); Gao, CX (Gao, Cunxiao); Niu, LQ (Niu, Linquan); Zhang, T (Zhang, Ting)
来源出版物: CHINESE OPTICS LETTERS  卷: 11  期: 5  文献号: 050601  DOI: 10.3788/COL201311.050601  出版年: MAY 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: We report a nanosecond-pulse amplification system based on an Yb-doped, 100-mu m core, rod-type photonic crystal fiber. Up to 10 W of average power with pulse energy of 1 mJ and peak power of 450 kW is obtained at the repetition rate of 10 kHz. The high-power nanosecond pulse has a good pulse shape and spectral characteristics. The usage of rod-type fibers provides a novel structure for nanosecond pulse amplification.
文献类型: Article
KeyWords Plus: W AVERAGE POWER; AMPLIFICATION SYSTEM; TISAPPHIRE LASER; OSCILLATOR
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 175JD 
ISSN: 1671-7694 


第 137 条,共 223 条
标题: A graphene Q-switched nanosecond Tm-doped fiber laser at 2 mu m 
作者: Jiang, M (Jiang, M.); Ma, HF (Ma, H. F.); Ren, ZY (Ren, Z. Y.); Chen, XM (Chen, X. M.); Long, JY (Long, J. Y.); Qi, M (Qi, M.); Shen, DY (Shen, D. Y.); Wang, YS (Wang, Y. S.); Bai, JT (Bai, J. T.)
来源出版物: LASER PHYSICS LETTERS  卷: 10  期: 5  文献号: 055103  DOI: 10.1088/1612-2011/10/5/055103  出版年: MAY 2013  
Web of Science 核心合集中的 "被引频次": 10 
被引频次合计: 10 
摘要: A passively Q-switched nanosecond Tm-doped fiber laser at 1957 nm wavelength was demonstrated using a graphene-based saturable absorber. The absorber was fabricated with graphene grown by chemical vapor deposition and transferred onto a high-reflection mirror. Stable Q-switched laser pulses were observed with the shortest pulse width of 760 ns, a repetition rate of 202 kHz and a maximum average output power of 96 mW. Our experimental results suggest that graphene is suitable for a Q-switcher near 2 mu m wavelength.
文献类型: Article
KeyWords Plus: FEW-LAYER GRAPHENE; SOLID-STATE LASER; SATURABLE ABSORBER; NORMAL-DISPERSION; YLF LASER
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 162DW 
ISSN: 1612-2011 


第 138 条,共 223 条
标题: Multi-walled carbon nanotube as a saturable absorber for a passively mode-locked Nd:YVO4 laser 
作者: Lin, XC (Lin, Xue Chun); Zhang, L (Zhang, Ling); Tsang, YH (Tsang, Yuen H.); Wang, YG (Wang, Yong Gang); Yu, HJ (Yu, Hai Juan); Yan, SL (Yan, Shi Lian); Sun, W (Sun, Wei); Yang, YY (Yang, Ying Ying); Han, ZH (Han, Zehua); Hou, W (Hou, Wei)
来源出版物: LASER PHYSICS LETTERS  卷: 10  期: 5  文献号: 055805  DOI: 10.1088/1612-2011/10/5/055805  出版年: MAY 2013  
Web of Science 核心合集中的 "被引频次": 4 
被引频次合计: 4 
摘要: Within the family of carbon nanotubes, multi-walled carbon nanotube material has the advantages of low-cost and high laser damage threshold. Therefore, in principle, it is more suitable for high power laser applications. In this letter, a high power continuous wave mode-locking Nd:YVO4 laser using a multi-walled carbon nanotube absorber has been successfully demonstrated. An average output power as high as 1.4 W has been achieved with a slope efficiency of 24%. The repetition rate and pulse width of the mode-locked laser were 68 MHz and 15.5 ps, respectively. The calculated pulse energy and peak power were 20.6 nJ and 1.33 kW, respectively.
文献类型: Article
KeyWords Plus: MU-M; LOCKING; COMPOSITES; PHOTONICS
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 162DW 
ISSN: 1612-2011 


第 139 条,共 223 条
标题: The Improved Design of Encoding Mask and the Correcting Method for Recovered Spectral Images in Hadamard Transform Spectral Imager Based on DMD 
作者: Xu, J (Xu Jun); Xie, CW (Xie Cheng-wang); Liu, HW (Liu Hai-wen); Liu, Q (Liu Qiang); Li, BC (Li Bin-cheng)
来源出版物: SPECTROSCOPY AND SPECTRAL ANALYSIS  卷: 33  期: 5  页: 1419-1423  DOI: 10.3964/j.issn.1000-0593(2013)05-1419-05  出版年: MAY 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 1 
摘要: A novel type of DMD-based Hadamard transform spectral imager is introduced. Taking the 7-order S-matrix as an example for discussion, the present paper develops an improved design of Hadamard encoding mask, which makes the dispersed spectrum of all pixels to be encoded by seven elements strictly. A correcting method for the recovered spectral images is proposed, and eventually 6 high-quality spectral images are obtained when Hadamard transform spectral imager operates based on 7-order S-matrix. Similarly, if the spectral imager operates based on n-order S-matrix, n-1 spectral images can be obtained. The experimental results show that the improved design and the correction method are feasible and effective.
文献类型: Article
作者关键词: Hadamard transform; Spectral imager; DMD; Encoding mask; Correcting method
Web of Science 类别: Spectroscopy
研究方向: Spectroscopy
IDS 号: 142YN 
ISSN: 1000-0593 


第 140 条,共 223 条
标题: Manifold Regularized Sparse NMF for Hyperspectral Unmixing 
作者: Lu, XQ (Lu, Xiaoqiang); Wu, H (Wu, Hao); Yuan, Y (Yuan, Yuan); Yan, PK (Yan, Pingkun); Li, XL (Li, Xuelong)
来源出版物: IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING  卷: 51  期: 5  页: 2815-2826  DOI: 10.1109/TGRS.2012.2213825  子辑: 1  出版年: MAY 2013  
Web of Science 核心合集中的 "被引频次": 5 
被引频次合计: 5 
摘要: Hyperspectral unmixing is one of the most important techniques in analyzing hyperspectral images, which decomposes a mixed pixel into a collection of constituent materials weighted by their proportions. Recently, many sparse nonnegative matrix factorization (NMF) algorithms have achieved advanced performance for hyperspectral unmixing because they overcome the difficulty of absence of pure pixels and sufficiently utilize the sparse characteristic of the data. However, most existing sparse NMF algorithms for hyperspectral unmixing only consider the Euclidean structure of the hyperspectral data space. In fact, hyperspectral data are more likely to lie on a low-dimensional submanifold embedded in the high-dimensional ambient space. Thus, it is necessary to consider the intrinsic manifold structure for hyperspectral unmixing. In order to exploit the latent manifold structure of the data during the decomposition, manifold regularization is incorporated into sparsity-constrained NMF for unmixing in this paper. Since the additional manifold regularization term can keep the close link between the original image and the material abundance maps, the proposed approach leads to a more desired unmixing performance. The experimental results on synthetic and real hyperspectral data both illustrate the superiority of the proposed method compared with other state-of-the-art approaches.
文献类型: Article
作者关键词: Hyperspectral unmixing; manifold regularization; mixed pixel; nonnegative matrix factorization (NMF)
KeyWords Plus: NONNEGATIVE MATRIX FACTORIZATION; ENDMEMBER EXTRACTION; COMPONENT ANALYSIS; ALGORITHM; IMAGERY
Web of Science 类别: Geochemistry & Geophysics; Engineering, Electrical & Electronic; Remote Sensing; Imaging Science & Photographic Technology
研究方向: Geochemistry & Geophysics; Engineering; Remote Sensing; Imaging Science & Photographic Technology
IDS 号: 137IJ 
ISSN: 0196-2892 
电子 ISSN: 1558-0644 


第 141 条,共 223 条
标题: Fabrication of microstructures in aviation components with a femtosecond laser based on PZT scanning 
作者: Yang, XJ (Yang, Xiaojun); Zhao, W (Zhao, Wei); Li, M (Li, Ming); Zhao, HL (Zhao, Hualong); Zhang, HX (Zhang, Huixing); Li, P (Li, Peng); Yang, Y (Yang, Yong); Cheng, GH (Cheng, Guanghua)
来源出版物: LASER PHYSICS  卷: 23  期: 5  文献号: 056001  DOI: 10.1088/1054-660X/23/5/056001  出版年: MAY 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: Thermal defects and low precision are the main disadvantages of fabricating micro-holes, irregular holes, and micro-slots in thermostable aviation materials. We demonstrate a manufacturing method employing a femtosecond laser and piezoelectric ceramic (PZT). The production process parameters were optimized according to the metallographic and dimensional accuracy of the microstructure, which was measured by phase-contrast microscopy and scanning electron microscopy. The limitations in a conventional aeroengine, such as in the recast layer, recrystallization, and micro-cracks, which degrade the performance and service life, were resolved with a simple, controllable, and commercial method.
文献类型: Article
KeyWords Plus: PULSES; ABLATION; HOLES
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 131QA 
ISSN: 1054-660X 


第 142 条,共 223 条
标题: Modal characteristics analysis of a doubly clad optical fiber with semi-weakly guiding approximation 
作者: Tan, XF (Tan, Xuefei); Liu, XL (Liu, Xianglian); Zhao, W (Zhao, Wei); Li, C (Li, Cheng); Wang, YS (Wang, Yishan); Li, JF (Li, Jianfeng)
来源出版物: OPTICS COMMUNICATIONS  卷: 294  页: 148-155  DOI: 10.1016/j.optcom.2012.11.080  出版年: MAY 1 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: Modified characteristic equations for doubly clad multimode fibers were rigorously derived under semi-weakly guiding approximation in this article. The analytical expressions of the power flows distributed in the three regions of fiber cross section are also given. Different from previous works, results in this paper elucidate that, other than the inner cladding, the refractive indices also hold a non-ignorable influence on the modal power distribution and mode behaviors. By comparing the results of two models, this article demonstrates that the singly clad fiber model may not be suitable for analyses of common doubly clad fibers. (C) 2012 Elsevier B.V. All rights reserved.
文献类型: Article
作者关键词: Characteristic equation; Modal characteristics; Power distributions
KeyWords Plus: AMPLIFIER
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 126PL 
ISSN: 0030-4018 


第 143 条,共 223 条
标题: Low-distortion plasmonic slow-light system at telecommunication regime 
作者: Zeng, C (Zeng, Chao); Cui, YD (Cui, Yudong)
来源出版物: OPTICS COMMUNICATIONS  卷: 294  页: 372-376  DOI: 10.1016/j.optcom.2012.12.037  出版年: MAY 1 2013  
Web of Science 核心合集中的 "被引频次": 3 
被引频次合计: 3 
摘要: On the basis of an analog of electromagnetically induced transparency (EIT), a metal-insulator-metal (MIM) plasmonic waveguide that has the capacity of realizing slow light with low distortion is proposed and investigated numerically. The transmission line results show that a quite flat dispersion curve with nearly constant group index over a broad bandwidth of 29.64 nm can be achieved by appropriately altering the grating depths. It is found that the group velocity dispersion (GVD) parameter of the proposed structure can approach zero. By means of Finite-Difference Time-Domain (FDTD) simulations, we find that the incident pulse centered at telecommunication regime (i.e., 1550 nm) could be dramatically slowed down with only 2.1% distortion due to the low dispersion. The proposed plasmonic slow-light system may find potential applications for optical buffers and all-optical signal processors in future highly integrated circuits. (C) 2012 Elsevier B.V. All rights reserved.
文献类型: Article
作者关键词: Surface plasmon polaritons; Photonic integrated circuits; Waveguides; Electromagnetically induced transparency
KeyWords Plus: ELECTROMAGNETICALLY INDUCED TRANSPARENCY; DELAY-BANDWIDTH PRODUCT; WAVE-GUIDE FILTERS; PHOTONIC CRYSTAL; OPTICAL BISTABILITY; NANODISK RESONATORS; TRANSMISSION; GRATINGS; REFLECTION; ABSORPTION
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 126PL 
ISSN: 0030-4018 
电子 ISSN: 1873-0310 


第 144 条,共 223 条
标题: Femtosecond multi-beam interference lithography based on dynamic wavefront engineering 
作者: Zhou, Q (Zhou, Qiang); Yang, WZ (Yang, Wenzheng); He, FT (He, Fengtao); Stoian, R (Stoian, Razvan); Hui, RQ (Hui, Rongqing); Cheng, GH (Cheng, Guanghua)
来源出版物: OPTICS EXPRESS  卷: 21  期: 8  页: 9851-9861  DOI: 10.1364/OE.21.009851  出版年: APR 22 2013  
Web of Science 核心合集中的 "被引频次": 2 
被引频次合计: 3 
摘要: A method for precise multi-spot parallel ultrafast laser material structuring is presented based on multi-beam interference generated by dynamic spatial phase engineering. A Spatial Light Modulator (SLM) and digitally programming of phase masks are used to accomplish the function of a multi-facet pyramid lens, so that the laser beam can be spatially modulated to create beam multiplexing and desired two-dimensional (2D) multi-beam interference patterns. Various periodic microstructures on metallic alloy surfaces are fabricated with this technique. A method of preparing extended scale periodic microstructures by loading dynamic time-varying phases is also demonstrated. Scanning electron microscopy (SEM) reveals the period and morphology of the microstructures created using this technique. The asymmetry of interference modes generated from the beams with asymmetric wave vector distributions is equally explored. The flexibility of programming the period of the microstructures is demonstrated. (c) 2013 Optical Society of America
PubMed ID: 23609691 
文献类型: Article
KeyWords Plus: SPATIAL LIGHT-MODULATOR; PHOTONIC CRYSTALS; HOLOGRAPHIC LITHOGRAPHY; PERIODIC STRUCTURES; LASER-PULSES; FABRICATION; MICROSTRUCTURES; GRATINGS; GLASS
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 133PP 
ISSN: 1094-4087 


第 145 条,共 223 条
标题: Empirical mode decomposition based background removal and de-noising in polarization interference imaging spectrometer (vol 21, pg 2592, 2013) 
作者: Zhang, CM (Zhang, Chunmin); Ren, WY (Ren, Wenyi); Mu, TK (Mu, Tingkui); Fu, LL (Fu, Lili); Jia, CL (Jia, Chenling)
来源出版物: OPTICS EXPRESS  卷: 21  期: 8  页: 10207-10207  DOI: 10.1364/OE.21.010207  出版年: APR 22 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: An erratum is presented to correct an error in an equation used to determine the interferogram without background and the estimated background of the recorded interferogram based on empirical mode decomposition. (C) 2013 Optical Society of America
文献类型: Correction
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 133PP 
ISSN: 1094-4087 


第 146 条,共 223 条
标题: Accurate measurement of the jitter time of GaAs photoconductive semiconductor switches triggered by a one-to-two optical fiber 
作者: Shi, W (Shi, Wei); Zhang, L (Zhang, Lin); Gui, HM (Gui, Huaimeng); Hou, L (Hou, Lei); Xu, M (Xu, Ming); Qu, GH (Qu, Guanghui)
来源出版物: APPLIED PHYSICS LETTERS  卷: 102  期: 15  文献号: 154106  DOI: 10.1063/1.4802755  出版年: APR 15 2013  
Web of Science 核心合集中的 "被引频次": 2 
被引频次合计: 2 
摘要: An improved method is proposed to measure the jitter time of the photoconductive semiconductor switches (PCSSs). A one-to-two fiber is utilized to separate and guide the 1053 nm laser beam to trigger two identical 3-mm-gap GaAs PCSSs synchronously. The jitter time is derived from the time lags of two switches turn-on by the error transfer theory. At a bias voltage of 1 kV, the jitter time is measured as 14.41 ps, which is the lowest jitter of GaAs PCSS that has been reported so far. (C) 2013 AIP Publishing LLC [http://dx.doi.org/10.1063/1.4802755]
文献类型: Article
Web of Science 类别: Physics, Applied
研究方向: Physics
IDS 号: 135EC 
ISSN: 0003-6951 


第 147 条,共 223 条
标题: Two-dimensional sub-half-wavelength atom localization via phase control of absorption and gain 
作者: Wan, RG (Wan, Ren-Gang); Zhang, TY (Zhang, Tong-Yi); Kou, J (Kou, Jun)
来源出版物: PHYSICAL REVIEW A  卷: 87  期: 4  文献号: 043816  DOI: 10.1103/PhysRevA.87.043816  出版年: APR 15 2013  
Web of Science 核心合集中的 "被引频次": 10 
被引频次合计: 10 
摘要: We propose a scheme for two-dimensional atom localization based on the coherent controlled absorption and gain of a weak probe field in a four-level double-Lambda system, in which the atom interacts with two orthogonal standing-wave fields. Owing to the space-dependent atom-field interaction, the position probability distribution of the atom passing through the standing waves can be directly determined by measuring the resulting absorption and gain spectra. The phase-sensitive property of the atomic system significantly reduces the uncertainty in the position measurement of the atom. It is found that, by properly varying the parameters of the system, we can achieve sub-half-wavelength atom localization with high precision. Especially the probability of finding the atom at a particular position can be 100% when a photon with certain frequency is absorbed or amplified. Numerical calculations and qualitative analyses show that the enhancement of precision in the position measurement of the atom is attributed to the interference between the one-photon excitation and the phase-dependent three-photon excitation from the closed interacting contour in the laser-driven atomic system. DOI: 10.1103/PhysRevA.87.043816
文献类型: Article
KeyWords Plus: ELECTROMAGNETICALLY INDUCED TRANSPARENCY; CONTROLLED SPONTANEOUS EMISSION; DOUBLE-DARK RESONANCES; TRIPOD SYSTEM; INVERSION; OPTICS; LASER
Web of Science 类别: Optics; Physics, Atomic, Molecular & Chemical
研究方向: Optics; Physics
IDS 号: 126BJ 
ISSN: 1050-2947 


第 148 条,共 223 条
标题: Precise spectrum reconstruction of the Fourier transforms imaging spectrometer based on polarization beam splitters 
作者: Ren, WY (Ren, Wenyi); Zhang, CM (Zhang, Chunmin); Jia, CL (Jia, Chenling); Mu, TK (Mu, Tingkui); Li, QW (Li, Qiwei); Zhang, L (Zhang, Lin)
来源出版物: OPTICS LETTERS  卷: 38  期: 8  页: 1295-1297  出版年: APR 15 2013  
Web of Science 核心合集中的 "被引频次": 3 
被引频次合计: 3 
摘要: A method was proposed to precisely reconstruct the spectrum from the interferogram taken by the Fourier transform imaging spectrometer (FTIS) based on the polarization beam splitters. Taken the FTISs based on the Savart polariscope and Wollaston prism as examples, the distorted spectrums were corrected via the proposed method effectively. The feasibility of the method was verified via simulation. The distorted spectrum, recovered from the interferogram taken by the polarization imaging spectrometer developed by us, was corrected. (C) 2013 Optical Society of America
PubMed ID: 23595463 
文献类型: Article
KeyWords Plus: FIELD-OF-VIEW; OPTICAL-PATH DIFFERENCE; SPECTROSCOPY; CALIBRATION; DESIGN; PRISMS
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 125ZG 
ISSN: 0146-9592 


第 149 条,共 223 条
标题: Structured illumination for resolution enhancement and autofocusing in digital holographic microscopy 
作者: Gao, P (Gao, Peng); Pedrini, G (Pedrini, Giancarlo); Osten, W (Osten, Wolfgang)
来源出版物: OPTICS LETTERS  卷: 38  期: 8  页: 1328-1330  出版年: APR 15 2013  
Web of Science 核心合集中的 "被引频次": 9 
被引频次合计: 9 
摘要: In this Letter we show how resolution enhancement and autofocusing in digital holographic microscopy is obtained by using structured illumination generated by a spatial light modulator, which enables it to project fringes of different orientations and phase shift without mechanical movement. The image plane is numerically determined by searching for the minimal deviation between the reconstructed images carried by different diffraction orders of the structured illuminations. (C) 2013 Optical Society of America
PubMed ID: 23595474 
文献类型: Article
KeyWords Plus: COMMON-PATH; SUPERRESOLUTION; INTERFEROMETRY
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 125ZG 
ISSN: 0146-9592 


第 150 条,共 223 条
标题: Sparse coding for image denoising using spike and slab prior 
作者: Lu, XQ (Lu, Xiaoqiang); Yuan, Y (Yuan, Yuan); Yan, PK (Yan, Pingkun)
来源出版物: NEUROCOMPUTING  卷: 106  页: 12-20  DOI: 10.1016/j.neucom.2012.09.014  出版年: APR 15 2013  
Web of Science 核心合集中的 "被引频次": 2 
被引频次合计: 3 
摘要: Sparse coding is a challenging and promising theme in image denoising. Its main goal is to learn a sparse representation from an over-complete dictionary. How to obtain a better sparse representation from the dictionary is important for the denoising process. In this paper, starting from the classic image denoising problem, a Bayesian-based sparse coding algorithm is proposed, which learns sparse representation with the spike and slab prior. Using the spike and slab prior, the proposed algorithm can achieve accurate prediction performance and effectively enforce sparsity. Experimental results on image denoising have demonstrated that the proposed algorithm can provide better representation and obtain excellent denoising performance. (c) 2012 Elsevier B.V. All rights reserved.
文献类型: Article
作者关键词: Image denoising; Sparse representation; Spike and slab prior
KeyWords Plus: LEARNED DICTIONARIES; VARIABLE SELECTION; REGRESSION; RECONSTRUCTION; ALGORITHMS; DOMAIN
Web of Science 类别: Computer Science, Artificial Intelligence
研究方向: Computer Science
IDS 号: 120FM 
ISSN: 0925-2312 


第 151 条,共 223 条
标题: A stable polarization switching laser from a bidirectional passively mode- locked thulium-doped fiber oscillator 
作者: Zhou, W (Zhou, Wei); Shen, DY (Shen, Deyuan); Wang, YS (Wang, Yishan); Ma, HF (Ma, Hefeng); Wang, F (Wang, Fei)
来源出版物: OPTICS EXPRESS  卷: 21  期: 7  页: 8945-8952  DOI: 10.1364/OE.21.008945  出版年: APR 8 2013  
Web of Science 核心合集中的 "被引频次": 2 
被引频次合计: 2 
摘要: We report on a novel polarization switching laser from a bidirectional passively mode-locked thulium(Tm)-doped fiber oscillator, which was characterized by the periodical change of polarization state of every pulse. The switching laser was created by combing two orthogonally stable vector solitons, which were found to be wave-breaking-free pulses in the all-anomalous-dispersion regime. The measured repetition rates of switching laser and the corresponding vector solitons were 49.596 MHz, 24.798 MHz, and 24.798MHz. By controlling wave plates, either of the polarized pulse trains can be switched on or off. To our knowledge, this is the first report of polarization switching laser with vector solitons in Tm fiber oscillators. (C) 2013 Optical Society of America
PubMed ID: 23571985 
文献类型: Article
KeyWords Plus: RING LASER; DISPERSION MANAGEMENT; VECTOR SOLITONS; THRESHOLD
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 126YN 
ISSN: 1094-4087 


第 152 条,共 223 条
标题: Reversal construction of polarization-controlled focusing field with multiple focal spots 
作者: Wang, JM (Wang, Jiming); Liu, QL (Liu, Qingliang); He, CJ (He, Chongjun); Liu, YW (Liu, Youwen)
来源出版物: OPTICAL ENGINEERING  卷: 52  期: 4  文献号: 048002  DOI: 10.1117/1.OE.52.4.048002  出版年: APR 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 1 
摘要: We propose an approach to control the polarization and intensity of the focusing field with multiple focal spots in a high-numericalaperture imaging system. This focused field is explained as the reversal radiation of the dipole array with presupposed oscillating direction in the focal volume. By engineering the structure of the electric dipole array and reversing the radiation from this dipole array, the local manipulation of intensity and polarization in the focal region is achieved, and the required field at the pupil plane is derived. A focusing field with six vectorial focal spots is created as an example to verify this method. This multifocal field will meet potential application in polarization-dependent optical microscope and optical trapping for multiple particles. (C) 2013 Society of PhotoOptical Instrumentation Engineers (SPIE)
文献类型: Article
KeyWords Plus: CYLINDRICAL-VECTOR BEAMS; OPTICAL NEEDLE; GENERATION; LIGHT; CREATION
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 151DB 
ISSN: 0091-3286 


第 153 条,共 223 条
标题: All-optical format conversion from non-return-to-zero to return-to-zero based on dual-pump four-wave mixing in photonic crystal fiber 
作者: Hui, ZQ (Hui Zhan-Qiang); Zhang, JG (Zhang Jian-Guo)
来源出版物: ACTA PHYSICA SINICA  卷: 62  期: 8  文献号: 084209  DOI: 10.7498/aps.62.084209  出版年: APR 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: A novel all-optical format conversion scheme based on dual-pump four-wave-mixing (DP-FWM) in dispersion-flattened highly nonlinear photonic crystal fiber (DF-HNL-PCF) is proposed and experimentally demonstrated. The original non-return-to-zero (NRZ) format is converted into double return-to-zero (RZ) format by injecting NRZ signal and double synchronized clock signals into the DF-HNL-PCF. The DP-FWM effect generates two sideband components, which carry the same data information as the original NRZ signal with RZ format. The wavelength tunability and dynamic range of format converter are investigated. The optimum extinct ratio and Q factor of converted signals are 15 dB and 5.4, respectively. The advantages of this scheme are that the each wavelength of double channel multicasting signals is dependent and flexible. Moreover, the system is transparent to bit rate as well as modulation format, and achieves all-optical wavelength conversion and wavelength multicasting.
文献类型: Article
作者关键词: format conversion; four-wave mixing; dual-pump; photonic crystal fiber
KeyWords Plus: HIGHLY NONLINEAR FIBER; CROSS-PHASE MODULATION; RZ FORMAT; REGENERATIVE NRZ; CHANNEL NRZ; WAVELENGTH CONVERTER; WAVE-GUIDES; WDM; AMPLIFIER; GENERATION
Web of Science 类别: Physics, Multidisciplinary
研究方向: Physics
IDS 号: 152CC 
ISSN: 1000-3290 


第 154 条,共 223 条
标题: Observations of bound states of two and three dissipative solitons in a figure-eight laser in a normal dispersion regime 
作者: Yun, L (Yun, Ling)
来源出版物: LASER PHYSICS  卷: 23  期: 4  文献号: 045106  DOI: 10.1088/1054-660X/23/4/045106  出版年: APR 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: Dissipative bound-state solitons exhibiting a trapezoid spectral profile and a regular modulation pattern are observed experimentally in a figure-eight fiber laser with large normal cavity dispersion for the first time, to the best of the author's knowledge. The soliton pairs have a pulse duration T-0 of about 800 fs and a peak-to-peak separation of about 8T(0). With the appropriate increase of the pumping strength, the proposed laser generates a bound state of three solitons with a pulse duration T-0 of about 460 fs and a separation between adjacent pulses of about 15T(0). Experimental results show that the bound-state solitons are strongly stable and suggest that they are formed by direct soliton interaction.
文献类型: Article
KeyWords Plus: ERBIUM-DOPED FIBER; PHOTONIC CRYSTAL FIBER; GINZBURG-LANDAU EQUATION; RING LASER; BRAGG GRATINGS; POLARIZATION; PULSES; OSCILLATOR; GENERATION
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 131PQ 
ISSN: 1054-660X 


第 155 条,共 223 条
标题: Spectroscopic properties of ZrF4-based fluorophosphate laser glasses with large stimulated emission cross-section and high thermal stability 
作者: Zheng, RL (Zheng, R. L.); Wang, PF (Wang, P. F.); Xu, SN (Xu, S. N.); Wei, W (Wei, W.); Peng, B (Peng, B.)
来源出版物: LASER PHYSICS  卷: 23  期: 4  文献号: 045805  DOI: 10.1088/1054-660X/23/4/045805  出版年: APR 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: A new kind of ytterbium-doped ZrF4-based fluorophosphate glass (FPZ), with large stimulated emission cross-section and high thermal stability, is prepared by introducing heavy metal oxides (HMO). The effects of HMO on glass structure, spectra and fluorescence are examined by Raman spectra, absorption and emission spectra. The result shows that the peak values of integrated absorption and emission cross-sections of the sample FPZ-6 are 7.15 x 10(4) pm(3) and 1.29 pm(2), with a lifetime of 1.51 ms and a Delta T (T-x - T-g) of 179.4 degrees C, implying that the novel FPZ glasses have potential applications as gain media in high-power lasers and fiber lasers.
文献类型: Article
KeyWords Plus: STRUCTURAL-PROPERTIES; OXIDE GLASSES; YB3+; DEPENDENCE; PBF2
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 131PQ 
ISSN: 1054-660X 


第 156 条,共 223 条
标题: Intrinsic Image Decomposition Using Optimization and User Scribbles 
作者: Shen, JB (Shen, Jianbing); Yang, XS (Yang, Xiaoshan); Li, XL (Li, Xuelong); Jia, YD (Jia, Yunde)
来源出版物: IEEE TRANSACTIONS ON CYBERNETICS  卷: 43  期: 2  页: 425-436  DOI: 10.1109/TSMCB.2012.2208744  出版年: APR 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: In this paper, we present a novel high-quality intrinsic image recovery approach using optimization and user scribbles. Our approach is based on the assumption of color characteristics in a local window in natural images. Our method adopts a premise that neighboring pixels in a local window having similar intensity values should have similar reflectance values. Thus, the intrinsic image decomposition is formulated by minimizing an energy function with the addition of a weighting constraint to the local image properties. In order to improve the intrinsic image decomposition results, we further specify local constraint cues by integrating the user strokes in our energy formulation, including constant-reflectance, constant-illumination, and fixed-illumination brushes. Our experimental results demonstrate that the proposed approach achieves a better recovery result of intrinsic reflectance and illumination components than the previous approaches.
文献类型: Article
作者关键词: Energy optimization; illumination; intrinsic images; reflectance; user scribbles
KeyWords Plus: NORMALIZED CUTS; SINGLE IMAGE; RETINEX; SEGMENTATION; COLOR; ILLUMINATION
Web of Science 类别: Computer Science, Artificial Intelligence; Computer Science, Cybernetics
研究方向: Computer Science
IDS 号: 126TO 
ISSN: 2168-2267 


第 157 条,共 223 条
标题: Saliency Detection by Multiple-Instance Learning 
作者: Wang, Q (Wang, Qi); Yuan, Y (Yuan, Yuan); Yan, PK (Yan, Pingkun); Li, X (Li, Xuelong)
来源出版物: IEEE TRANSACTIONS ON CYBERNETICS  卷: 43  期: 2  页: 660-672  DOI: 10.1109/TSMCB.2012.2214210  出版年: APR 2013  
Web of Science 核心合集中的 "被引频次": 10 
被引频次合计: 10 
摘要: Saliency detection has been a hot topic in recent years. Its popularity is mainly because of its theoretical meaning for explaining human attention and applicable aims in segmentation, recognition, etc. Nevertheless, traditional algorithms are mostly based on unsupervised techniques, which have limited learning ability. The obtained saliency map is also inconsistent with many properties of human behavior. In order to overcome the challenges of inability and inconsistency, this paper presents a framework based on multiple-instance learning. Low-, mid-, and high-level features are incorporated in the detection procedure, and the learning ability enables it robust to noise. Experiments on a data set containing 1000 images demonstrate the effectiveness of the proposed framework. Its applicability is shown in the context of a seam carving application.
文献类型: Article
作者关键词: Attention; computer vision; machine learning; multiple-instance learning (MIL); saliency; saliency map
KeyWords Plus: SELECTIVE VISUAL-ATTENTION; REGION DETECTION; IMAGE SEGMENTATION; RECOGNITION; COLOR; MODEL
Web of Science 类别: Computer Science, Artificial Intelligence; Computer Science, Cybernetics
研究方向: Computer Science
IDS 号: 126TO 
ISSN: 2168-2267 


第 158 条,共 223 条
标题: Femtosecond Laser Pulses for Drilling the Shaped Micro-Hole of Turbine Blades 
作者: Jia, HN (Jia Hai-Ni); Yang, XJ (Yang Xiao-Jun); Zhao, W (Zhao Wei); Zhao, HL (Zhao Hua-Long); Du, X (Du Xu); Yang, Y (Yang Yong)
来源出版物: CHINESE PHYSICS LETTERS  卷: 30  期: 4  文献号: 044202  DOI: 10.1088/0256-307X/30/4/044202  出版年: APR 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: We design a set of processing devices to drill the shaped holes of turbine blades by using a femtosecond laser which outputs 1064 nm 5 W pulses at 100 kHz, investigate the mechanism of the femtosecond laser interaction with metals, and demonstrate that ultrafast laser drilling has distinct strong points against electric spark and longer laser pulse processing. The advantages related to no recast layer, no thermal effect, no micro crack, high precision, and high processing efficiency are carried out.
文献类型: Article
Web of Science 类别: Physics, Multidisciplinary
研究方向: Physics
IDS 号: 125UN 
ISSN: 0256-307X 


第 159 条,共 223 条
标题: Numerical analysis of temporal response of a large exponential-doping transmission-mode GaAs photocathode 
作者: Cai, ZP (Cai, Zhipeng); Yang, WZ (Yang, Wenzheng); Tang, WD (Tang, Weidong); Hou, X (Hou, Xun)
来源出版物: MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING  卷: 16  期: 2  页: 238-244  DOI: 10.1016/j.mssp.2012.09.011  出版年: APR 2013  
Web of Science 核心合集中的 "被引频次": 2 
被引频次合计: 2 
摘要: The theory of temporal response properties for a large exponential-doping transmission mode GaAs photocathode is discussed in detail. By the introduction of a new concept referred to as "average decay time", the deficiency usually caused by the boundary condition in the previous calculations is effectively eliminated. The analytical results show that the response time of the new GaAs photocathode can be significantly reduced to several picoseconds in the absence of bias. In addition, the thickness of the GaAs absorption layer we obtained is much larger than that of traditional GaAs photocathodes with the same response time, which means that the novel photocathode with ultrafast time response will have higher yield, especially in near-infrared region. (c) 2012 Elsevier Ltd. All rights reserved.
文献类型: Review
作者关键词: Temporal response; The average delay time; Large exponential-doping; GaAs photocathode
KeyWords Plus: THEORETICAL CALCULATION; ELECTRON SOURCE; SURFACE; RANGE
Web of Science 类别: Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter
研究方向: Engineering; Materials Science; Physics
IDS 号: 112GT 
ISSN: 1369-8001 


第 160 条,共 223 条
标题: Yb-doped passively mode-locked fiber laser based on a single wall carbon nanotubes wallpaper absorber 
作者: Li, XH (Li, Xiaohui); Wang, YG (Wang, Yonggang); Wang, YS (Wang, Yishan); Liu, XL (Liu, Xianglian); Zhao, W (Zhao, Wei); Hu, XH (Hu, Xiaohong); Yang, Z (Yang, Zhi); Zhang, W (Zhang, Wei); Gao, CX (Gao, Cunxiao); Shen, DY (Shen, Deyuan); Li, C (Li, Cheng); Tsang, YH (Tsang, Yuen H.)
来源出版物: OPTICS AND LASER TECHNOLOGY  卷: 47  页: 144-147  DOI: 10.1016/j.optlastec.2012.08.010  出版年: APR 2013  
Web of Science 核心合集中的 "被引频次": 5 
被引频次合计: 5 
摘要: A passively mode-locked Yb-doped fiber laser is demonstrated based on a band-pass filter together with a novel fabricated single-wall carbon nanotubes (SW/CNT) wallpaper absorber. Mode-locking can be achieved with a low threshold pump power of 32 mW. The proposed fiber laser operates at 1064 nm with the spectral width of about 0.57 nm and pulse repetition rate of about 19.45 MHz. The pulse duration is about 276 ps, which can be used directly as seed source for chirped pulse amplification (CPA) system. Crown Copyright (C) 2012 Published by Elsevier Ltd. All rights reserved.
文献类型: Article
作者关键词: Lasers fiber; Mode-locked lasers; Single-wall carbon nanotubes wallpaper absorber
KeyWords Plus: SATURABLE ABSORBER; NORMAL-DISPERSION; HIGH-POWER; PULSES; FILM
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 073XA 
ISSN: 0030-3992 


第 161 条,共 223 条
标题: Double image encryption scheme by using random phase encoding and pixel exchanging in the gyrator transform domains 
作者: Liu, ZJ (Liu, Zhengjun); Zhang, Y (Zhang, Yu); Li, S (Li, She); Liu, W (Liu, Wei); Liu, WY (Liu, Wanyu); Wang, YH (Wang, Yanhua); Liu, ST (Liu, Shutian)
来源出版物: OPTICS AND LASER TECHNOLOGY  卷: 47  页: 152-158  DOI: 10.1016/j.optlastec.2012.09.007  出版年: APR 2013  
Web of Science 核心合集中的 "被引频次": 6 
被引频次合计: 7 
摘要: We present a double image encryption scheme by using random pixel exchanging and phase encoding in gyrator domains. Two original images are regarded as the amplitude and phase of a function in the encryption algorithm. The pixels of the two images are exchanged randomly by controlling of a matrix. The same random matrix is used in the process of pixel exchanging and phase encoding for saving space in the application of transmission and storage of key. Some numerical simulation results are made for demonstrating the performance and security of the double image encryption. (C) 2012 Elsevier Ltd. All rights reserved.
文献类型: Article
作者关键词: Image hiding; Cryptography; Scrambling
KeyWords Plus: FRACTIONAL FOURIER-TRANSFORM; OPTICAL ENCRYPTION; FRESNEL DOMAIN; SHIFTING INTERFEROMETRY; PLAINTEXT ATTACK; ARNOLD TRANSFORM; ALGORITHM; HOLOGRAPHY; OPERATION
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 073XA 
ISSN: 0030-3992 


第 162 条,共 223 条
标题: High contrast ballistic imaging using femtosecond optical Kerr gate of tellurite glass 
作者: Tan, WJ (Tan, Wenjiang); Zhou, ZG (Zhou, Zhiguang); Lin, AX (Lin, Aoxiang); Si, JH (Si, Jinhai); Zhan, PP (Zhan, Pingping); Wu, B (Wu, Bin); Hou, X (Hou, Xun)
来源出版物: OPTICS EXPRESS  卷: 21  期: 6  页: 7740-7747  DOI: 10.1364/OE.21.007740  出版年: MAR 25 2013  
Web of Science 核心合集中的 "被引频次": 2 
被引频次合计: 2 
摘要: We investigated the ballistic imaging technique using femtosecond optical Kerr gate of a tellurite glass. High contrast images of an object hidden behind turbid media were obtained. Compared to the conventional femtosecond optical Kerr gate using fused quartz, the optical Kerr gate using tellurite glass has more capacity to acquire high quality images of the object hidden behind a high optical density turbid medium. The experimental results indicated that the tellurite glass is a good candidate as the optical Kerr material for the ballistic imaging technique due to its large optical nonlinearity. (C) 2013 Optical Society of America
PubMed ID: 23546155 
文献类型: Article
KeyWords Plus: SCATTERING MEDIA; TURBID MEDIA; LIQUID-CORE; SINGLE-SHOT; ULTRAFAST; OBJECTS
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 115ES 
ISSN: 1094-4087 


第 163 条,共 223 条
标题: Chirp structure measurement of a supercontinuum pulse based on transient lens effect in tellurite glass 
作者: Zhang, H (Zhang, Hang); Zhou, ZG (Zhou, Zhiguang); Lin, AX (Lin, Aoxiang); Cheng, J (Cheng, Jun); Yan, LH (Yan, Lihe); Si, JH (Si, Jinhai); Chen, F (Chen, Feng); Hou, X (Hou, Xun)
来源出版物: JOURNAL OF APPLIED PHYSICS  卷: 113  期: 11  文献号: 113106  DOI: 10.1063/1.4795587  出版年: MAR 21 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: We demonstrated the controllable acquisition of optical gated spectra from a chirped supercontinuum (SC) pulse based on ultrafast transient lens (TrL) effect. Comparing with CS2, the gated spectra had much narrower spectral bandwidths using tellurite glass (Te glass) as the nonlinear medium due to its ultrafast nonlinear response. Experimental results showed that the chirp structure of the SC pulse measured by TrL method was quite accordant with that measured by femtosecond optical Kerr gate method. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4795587]
文献类型: Article
KeyWords Plus: FEMTOSECOND LASER-PULSE; WHITE-LIGHT CONTINUUM; 2-PHOTON ABSORPTION; KERR LENS; SPECTROSCOPY; GENERATION; FIBER; AIR
Web of Science 类别: Physics, Applied
研究方向: Physics
IDS 号: 111UA 
ISSN: 0021-8979 


第 164 条,共 223 条
标题: Slow light engineering in periodic-stub-assisted plasmonic waveguide 
作者: Wang, GX (Wang, Guoxi)
来源出版物: APPLIED OPTICS  卷: 52  期: 9  页: 1799-1804  DOI: 10.1364/AO.52.001799  出版年: MAR 20 2013  
Web of Science 核心合集中的 "被引频次": 3 
被引频次合计: 3 
摘要: We investigate the slow light engineering in periodic-stub-assisted plasmonic waveguide based on transmission line theory. It is found that the dispersion relationship of the proposed waveguide can be easily modified by tuning the stub depth and the period. The theoretical results show that a large normalized delay bandwidth product of 0.65 can be achieved at 1550nm, meanwhile maintaining the group index of 35. In addition, the proposed waveguide shows "S-shaped" dispersion curve, which implies that the group velocity dispersion parameter at the inflection point equals zero and a dispersion-free slow light waveguide can be realized. Due to the excellent buffering capacity, the proposed compact configuration can find important applications on optical buffers in highly integrated optical circuits. (C) 2013 Optical Society of America
PubMed ID: 23518720 
文献类型: Article
KeyWords Plus: ELECTROMAGNETICALLY INDUCED TRANSPARENCY; DELAY-BANDWIDTH PRODUCT; NANODISK RESONATORS; REFLECTION; DISPERSION; GRATINGS; FILTERS
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 110KM 
ISSN: 1559-128X 
电子 ISSN: 2155-3165 


第 165 条,共 223 条
标题: Femtosecond nonlinear optical property of a TeO2-ZnO-Na2O glass and its application in time-resolved three-dimensional imaging 
作者: Tan, WJ (Tan, Wenjiang); Zhou, ZG (Zhou, Zhiguang); Lin, AX (Lin, Aoxiang); Si, JH (Si, Jinhai); Tong, JY (Tong, Junyi); Hou, X (Hou, Xun)
来源出版物: OPTICS COMMUNICATIONS  卷: 291  页: 337-340  DOI: 10.1016/j.optcom.2012.11.035  出版年: MAR 15 2013  
Web of Science 核心合集中的 "被引频次": 3 
被引频次合计: 3 
摘要: Compared with bismuth glasses and chalcogenide glasses, tellurite glasses have a wider transparency Window. Especially, these glasses with excellent transparency in visible region could offer a larger dynamic range for the time-resolved simultaneous three-dimensional imaging based on the optical Kerr gate (OKG). We investigated the ultrafast nonlinear optical properties of a TeO2-ZnO-Na2O glass using a femtosecond optical Kerr gate at wavelength of 800 nm. The nonlinear refraction n(2) and the ultrafast nonlinear response time of the tellurite glass were estimated to be 4.56 x 10(-15) cm(2)/W and less than 200 fs, respectively. We also demonstrated the time-resolved simultaneous three-dimensional imaging using the tellurite glass as the Kerr medium, which indicated that tellurite glasses may also be good candidates as the Kerr media for the time-resolved imaging based on the OKG. (C) 2012 Elsevier B.V. All rights reserved.
文献类型: Article
作者关键词: Optical Kerr gate; Tellurite glass; Femtosecond; Time-resolved imaging
KeyWords Plus: 3RD-ORDER NONLINEARITIES; CHALCOGENIDE GLASS; TELLURITE GLASS; FIBER; AMPLIFIERS; SILICON
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 090SV 
ISSN: 0030-4018 


第 166 条,共 223 条
标题: Long-Distance Axial Trapping with Focused Annular Laser Beams 
作者: Lei, M (Lei, Ming); Li, Z (Li, Ze); Yan, SH (Yan, Shaohui); Yao, BL (Yao, Baoli); Dan, D (Dan, Dan); Qi, YJ (Qi, Yujiao); Qian, J (Qian, Jia); Yang, YL (Yang, Yanlong); Gao, P (Gao, Peng); Ye, T (Ye, Tong)
来源出版物: PLOS ONE  卷: 8  期: 3  文献号: e57984  DOI: 10.1371/journal.pone.0057984  出版年: MAR 7 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: Focusing an annular laser beam can improve the axial trapping efficiency due to the reduction of the scattering force, which enables the use of a lower numerical aperture (NA) objective lens with a long working distance to trap particles in deeper aqueous medium. In this paper, we present an axicon-to-axicon scheme for producing parallel annular beams with the advantages of higher efficiency compared with the obstructed beam approach. The validity of the scheme is verified by the observation of a stable trapping of silica microspheres with relatively low NA microscope objective lenses (NA = 0.6 and 0.45), and the axial trapping depth of 5 mm is demonstrated in experiment.
PubMed ID: 23505449 
文献类型: Article
KeyWords Plus: METALLIC RAYLEIGH PARTICLES; OPTICAL TWEEZERS; VECTORIAL DIFFRACTION; RADIAL POLARIZATION; LIGHT-BEAM; EFFICIENCY; FORCES; MICROMANIPULATION; STIFFNESS; DEPTH
Web of Science 类别: Multidisciplinary Sciences
研究方向: Science & Technology - Other Topics
IDS 号: 136BN 
ISSN: 1932-6203 


第 167 条,共 223 条
标题: Steady-state multiple dark spatial solitons in closed-circuit photovoltaic media 
作者: Zhang, YH (Zhang, Y. H.); Hu, XH (Hu, X. H.); Lu, KQ (Lu, K. Q.); Liu, BY (Liu, B. Y.); Liu, WY (Liu, W. Y.); Guo, RL (Guo, R. L.)
来源出版物: JOURNAL OF OPTICAL TECHNOLOGY  卷: 80  期: 3  页: 135-141  DOI: 10.1364/JOT.80.000135  出版年: MAR 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: We theoretically study the formation of the steady state multiple dark photovoltaic solitons in the closed-circuit photovoltaic photorefractive crystal. The results indicate that the formation of the multiple dark photovoltaic solitons in the closed-circuit photovoltaic crystal is dependent on the initial width of the dark notch at the entrance face of the crystal. The number of the solitons generated increases with the initial width of the dark notch. If the initial width of the dark notch is small, only a fundamental soliton or Y-junction soliton pair is generated. As the initial width of the dark notch is increased, the dark notch tends to split into an odd (or even) number of multiple dark photovoltaic solitons sequence, which realizes a progressive transition from a lower-order soliton to a higher-order solitons sequence. When the multiple solitons are generated, the separations between adjacent dark solitons become slightly smaller. The soliton pairs far away from the center have bigger width and less visibility and they move away from each other as they propagate in the photorefractive nonlinear crystal. (C) 2013 Optical Society of America.
文献类型: Article
KeyWords Plus: INDUCED WAVE-GUIDES; PHOTOREFRACTIVE SOLITONS; LINBO3FE CRYSTAL; PROPAGATION
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 157OV 
ISSN: 1070-9762 


第 168 条,共 223 条
标题: CALCULATION OF EFFECTIVE NONLINEAR COEFFICIENT IN BIBO FOR SPONTANEOUS PARAMETRIC DOWN CONVERSION 
作者: Huo, GW (Huo, Guangwen); Zhang, TY (Zhang, Tongyi); Cheng, GH (Cheng, Guanghua); Zhao, W (Zhao, Wei)
来源出版物: JOURNAL OF NONLINEAR OPTICAL PHYSICS & MATERIALS  卷: 22  期: 1  文献号: 1350010  DOI: 10.1142/S0218863513500100  出版年: MAR 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: We theoretically investigate the effective nonlinear coefficient d(eff) of spontaneous parametric down-conversion (SPDC) process in biaxial nonlinear crystal BiB3O6 (BIBO). We solve the Fresnel equations in the collinear degenerate down-converted configuration, and get the relations of phase-matching angles. Considering the double phase-matching, we compute the phase-matching angles with different wavelength. Furthermore, we simplify the expression of effective nonlinear coefficient out of the principal planes, and numerically calculate it varying with the angle and wavelength. These results indicate that there are three effective phase-matching schemes for SPDC which can be used to construct a system to generate entangled photon pairs.
文献类型: Article
作者关键词: Effective nonlinear coefficient; BIBO crystal; phase-matching; SPDC
KeyWords Plus: INTRACAVITY 2ND-HARMONIC GENERATION; PHASE-MATCHING DIRECTIONS; BISMUTH BORATE BIB3O6; 1.06 MU-M; OPTICAL-CRYSTALS; ENTANGLEMENT; PHOTONS; LASER; POWER; PAIRS
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 143OZ 
ISSN: 0218-8635 


第 169 条,共 223 条
标题: A passively Q-switched thulium-doped fiber laser with single-walled carbon nanotubes 
作者: Ma, HF (Ma, H. F.); Wang, YG (Wang, Y. G.); Zhou, W (Zhou, W.); Long, JY (Long, J. Y.); Shen, DY (Shen, D. Y.); Wang, YS (Wang, Y. S.)
来源出版物: LASER PHYSICS  卷: 23  期: 3  文献号: 035109  DOI: 10.1088/1054-660X/23/3/035109  出版年: MAR 2013  
Web of Science 核心合集中的 "被引频次": 3 
被引频次合计: 3 
摘要: We demonstrate a passively Q-switched thulium-doped fiber laser by using single-walled carbon nanotube (SWCNT) polyvinyl alcohol (PVA) composite film as the saturable absorber (SA). A relatively large mode area on the SA was employed to avoid damage of the SWCNT/PVA film and benefit pulsed laser operation. Stable pulses of 85-164 kHz repetition rate were generated at 1967 nm with a maximum average output power of 103 mW. The single pulse energy was up to similar to 0.63 mu J with similar to 0.87 mu s pulse duration.
文献类型: Article
KeyWords Plus: 2 MU-M; SATURABLE ABSORBER; POWER; NM
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 131PN 
ISSN: 1054-660X 


第 170 条,共 223 条
标题: A nonuniform-polarization high-energy ultra-broadband laser with a long erbium-doped fiber 
作者: Mao, D (Mao, Dong)
来源出版物: LASER PHYSICS  卷: 23  期: 3  文献号: 035104  DOI: 10.1088/1054-660X/23/3/035104  出版年: MAR 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: We have experimentally investigated nonuniformly polarized broadband high-energy pulses delivered from a mode-locked laser with an ultra-long erbium-doped fiber (EDF). The pulses exhibit a broadband spectrum of similar to 73 nm and can avoid optical wave breaking at high-pump regimes. The polarization states of the pulses evolve from uniform to nonuniform at each round trip in the oscillator, which is distinct from other pulses. Remarkably, the output pulses broaden in anomalous-or normal-dispersion regimes while they can be shortened with an EDF amplifier external to the cavity. Our results suggest that the long EDF results in a nonuniform-polarization state and plays a decisive role in the formation of high-energy pulses.
文献类型: Article
KeyWords Plus: PHOTONIC CRYSTAL FIBER; NET-NORMAL-DISPERSION; LOW REPETITION RATE; DISSIPATIVE SOLITONS; ANOMALOUS-DISPERSION; BRAGG GRATINGS; GIANT-CHIRP; RING LASER; PULSES; GENERATION
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 131PN 
ISSN: 1054-660X 


第 171 条,共 223 条
标题: Experimental investigations of pulse shape control in passively mode-locked fiber lasers with net-normal dispersion 
作者: Wang, LR (Wang, L. R.); Han, DD (Han, D. D.)
来源出版物: LASER PHYSICS  卷: 23  期: 3  文献号: 035106  DOI: 10.1088/1054-660X/23/3/035106  出版年: MAR 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: Pulse shape control in passively mode-locked fiber lasers with net-normal dispersion is investigated experimentally. Three kinds of pulses with different spectral and temporal shapes are observed, and their pulse-shaping mechanisms are discussed. After a polarization-resolved system external to the cavity, the maximum intensity differences of the two polarization components for the rectangular-spectrum (RS), Gaussian-spectrum (GS), and super-broadband (SB) pulses are measured as similar to 20 dB, similar to 15 dB, and similar to 1 dB, respectively. It is suggested that the equivalent saturable absorption effect plays an increasingly important role from the RS to GS and then to SB pulses in the pulse-shaping processes, while the spectral filtering effect declines. This work could help in systematically understanding pulse formation and proposing guidelines for the realization of pulses with better performance in fiber lasers.
文献类型: Article
KeyWords Plus: ERBIUM-DOPED FIBER; PHOTONIC CRYSTAL FIBER; NORMAL-CAVITY-DISPERSION; DISSIPATIVE SOLITONS; SUPERCONTINUUM GENERATION; BRAGG GRATINGS; EVOLUTION; OSCILLATOR; LOCKING
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 131PN 
ISSN: 1054-660X 


第 172 条,共 223 条
标题: A space audio cummunication system based on X-ray 
作者: Deng, NQ (Deng Ning-Qin); Zhao, BS (Zhao Bao-Sheng); Sheng, LZ (Sheng Li-Zhi); Yan, QR (Yan Qiu Rong); Yang, H (Yang Hao); Liu, D (Liu Duo)
来源出版物: ACTA PHYSICA SINICA  卷: 62  期: 6  文献号: 060705  DOI: 10.7498/aps.62.060705  出版年: MAR 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: In this paper, an X-ray communication program, which consists of a sender of grid controlled X-ray source and a receiver of X-ray single-photon detector based on micro-channel plate, is presented. With the detailed information about the signal modulation transmitter, the micro-channel-based X-ray single-photon detector as well as the signal receiving demodulator, a space audio communication system based on X-ray is built. The communication rate of more than 20 kbit/s is realized. According to the preliminary test result analyses of the X-ray space audio communication system test, the X-ray emission success rate restricts the communication speed by the influence of different X-ray intensities, signal shaping time and threshold settings respectively. Therefore, a scheme for further increasing X-ray communication performance is suggested.
文献类型: Article
作者关键词: X-ray communication; X-ray source; detector
Web of Science 类别: Physics, Multidisciplinary
研究方向: Physics
IDS 号: 122OX 
ISSN: 1000-3290 


第 173 条,共 223 条
标题: Theoretical and experimental study of two-phase-stepping approach for hard X-ray differential phase contrast imaging 
作者: Du, Y (Du Yang); Lei, YH (Lei Yao-Hu); Liu, X (Liu Xin); Guo, JC (Guo Jin-Chuan); Niu, HB (Niu Han-Ben)
来源出版物: ACTA PHYSICA SINICA  卷: 62  期: 6  文献号: 068702  DOI: 10.7498/aps.62.068702  出版年: MAR 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: To satisfy the need of low-dose and high-speed in practical application of hard X-ray differential phase contrast imaging, according to the theoretical analysis and the optimal design of parameters for the experimental system, we propose a two-stepping phase shift algorithm to retrieve the object phase information. The method can effectively reduce the radiation dose and substantially improve the speed of retrieving phase information, which lays the foundation for the X-ray phase contrast imaging in medical and industrial applications.
文献类型: Article
作者关键词: grating interferometer; X-ray phase contrast imaging; two-stepping phase shift algorithm
KeyWords Plus: INTERFEROMETER; RETRIEVAL
Web of Science 类别: Physics, Multidisciplinary
研究方向: Physics
IDS 号: 122OX 
ISSN: 1000-3290 


第 174 条,共 223 条
标题: Controlled focus shaping with generalized cylindrical vector beam 
作者: Chen, LL (Chen, Lingling); Wang, JM (Wang, Jiming); He, CJ (He, Chongjun); Liu, YW (Liu, Youwen); Yun, MJ (Yun, Maojin); Kong, WJ (Kong, Weijin)
来源出版物: JOURNAL OF MODERN OPTICS  卷: 60  期: 5  页: 391-398  DOI: 10.1080/09500340.2013.779392  出版年: MAR 1 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: An optical system is proposed for the controlled focus shaping of generalized cylindrical vector beams by a high-numerical-aperture lens. A segmented electro-optical filter with four concentric belts is introduced and works with a double-/2-plate. By controlling the rotational angle of the plate and the voltage applied to the filter with proper azimuth angle, a three-dimensional engineered focusing field, such as an electrically controlled axial-shifted focus, extended depth of focus, and a diffraction-limited optical tube, can be achieved. The main advantage of this focusing system is that the focused field can be adjusted and formed by the applied voltage and the rotational angle of the half-wave plates. It can provide a new focus shaping technique with free adjustability and flexibility.
文献类型: Article
作者关键词: polarization; birefringence; electro-optics; cylindrical vector beam; laser beam shaping
KeyWords Plus: EXTENDED FOCAL DEPTH; RADIAL POLARIZATION; SUPERRESOLUTION; GENERATION; NEEDLE; SHIFT; FIELD; CREATION; FILTER; LIGHT
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 122IP 
ISSN: 0950-0340 
电子 ISSN: 1362-3044 


第 175 条,共 223 条
标题: Study on THz Spectra and Vibrational Modes of Benzoic Acid and Sodium Benzoate 
作者: Zheng, ZP (Zheng Zhuan-ping); Fan, WH (Fan Wen-hui); Yan, H (Yan Hui); Liu, J (Liu Jia); Xu, LM (Xu Li-min)
来源出版物: SPECTROSCOPY AND SPECTRAL ANALYSIS  卷: 33  期: 3  页: 582-585  DOI: 10.3964/j.issn.1000-0593(2013)03-0582-04  出版年: MAR 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: Terahertz time-domain spectroscopy was employed to measure the terahertz absorption spectra of benzoic acid and sodium benzoate at room temperature. The origins of the measured features of benzoic acid were summarized based on previous study. Density functional theory was used to compute and analyze the molecular structure and vibrational modes of sodium benzoate in monomer. Based on the obtained results, the authors found that the THz spectral features can be used to distinguish benzoic acid and sodium benzoate totally; the essential reason for the THz spectral difference between benzoic acid and sodium benzoate is that the electrovalent bond of sodium benzoate affects the values of covalent bond lengths and bond angles, as well as the molecular interactions and arrangement in unit cell; the measured features of benzoic acid and sodium benzoate come from the collective vibrations except the peaks located at 107 cm(-1) of benzoic acid and 54 cm(-1) of sodium benzoate.
文献类型: Article
作者关键词: Terahertz time-domain spectroscopy (THz-TDS); Density functional theory (DFT); Benzoic acid; Sodium benzoate
KeyWords Plus: TIME-DOMAIN SPECTROSCOPY; TERAHERTZ SPECTROSCOPY
Web of Science 类别: Spectroscopy
研究方向: Spectroscopy
IDS 号: 124BX 
ISSN: 1000-0593 


第 176 条,共 223 条
标题: Design of the Airborne Prism Dispersive Imaging Spectrometer System Based on Offner Relay Configuration 
作者: Fang, Y (Fang Yu); Xiangli, B (Xiangli Bin); Yuan, Y (Yuan Yan); Lu, QB (Lu Qun-bo); Zhou, JS (Zhou Jin-song)
来源出版物: SPECTROSCOPY AND SPECTRAL ANALYSIS  卷: 33  期: 3  页: 838-843  DOI: 10.3964/j.issn.1000-0593(2013)03-0838-06  出版年: MAR 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: Considering the development of the need for small volume and light weight of spectral imaging systems on airborne platform, the characters of several main imaging spectrometers was analyzed and the present paper focuses on introducing imaging spectrometers featuring a grating or a prism disperser. A compact hyperspectral imaging system based on Offner relay configuration is reported. Combining the characters of the concentric Offner relay, and knowing the system design parameters, two novel kinds of spherical spectrometer systems using dispersive elements in divergent and convergent beam were designed. Moreover, the system MTF, spot diagram and the curves of smile and keystone were analyzed. The results show that these two kinds of Offner spectrometer achieve the purpose of a compact form of remote sensing system with excellent imaging quality close to diffraction limit. At the same time, decreasing the smile and keystone to a small (0. 1) fraction of a pixel assures uniformity of acquiring spectral data.
文献类型: Article
作者关键词: Hyperspectral imaging; Offner relay configuration; Imaging spectrometer; Prism spectrometer; Optical design; Curved prism
KeyWords Plus: IMAGER
Web of Science 类别: Spectroscopy
研究方向: Spectroscopy
IDS 号: 124BX 
ISSN: 1000-0593 


第 177 条,共 223 条
标题: Generation of three-dimensional optical structures by dynamic holograms displayed on a twisted nematic liquid crystal display 
作者: Ma, BH (Ma, Baiheng); Yao, BL (Yao, Baoli); Li, Z (Li, Ze); Lei, M (Lei, Ming); Yan, SH (Yan, Shaohui); Gao, P (Gao, Peng); Dan, D (Dan, Dan); Ye, T (Ye, Tong)
来源出版物: APPLIED PHYSICS B-LASERS AND OPTICS  卷: 110  期: 4  页: 531-537  DOI: 10.1007/s00340-012-5289-x  出版年: MAR 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: Reconstruction of computer generated holograms (CGHs) addressed on a spatial light modulator (SLM) is an effective way to dynamically generate designed light field distributions. Based on the classic Gerchberg-Saxton (GS) algorithm, we proposed a technique, which can greatly reduce the computation cost to about 60 % in calculating CGHs for three-dimensional (3D) structures but with little degradation of reconstructed light field compared with the classic GS algorithm. The CGHs calculated by our method were displayed on a twisted nematic liquid crystal display, working as a phase-only-modulation SLM, and 3D structures of optical fields, e.g., 3D array of optical traps and vortices, were reconstructed with high efficiency and high quality. Besides, the possibility for 3D holographic display or projection was also demonstrated with this algorithm by reconstruction several images simultaneously in distinct axial planes.
文献类型: Article
KeyWords Plus: GERCHBERG-SAXTON-ALGORITHM; TWEEZERS; PHASE; MICROMANIPULATION; MODULATOR
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 109BH 
ISSN: 0946-2171 


第 178 条,共 223 条
标题: Stability-improved slow light in polarization-maintaining fiber based on polarization-managed stimulated Brillouin scattering 
作者: Ju, HJ (Ju, Haijuan); Ren, LY (Ren, Liyong); Liang, J (Liang, Jian); Ma, CJ (Ma, Chengju)
来源出版物: JOURNAL OF OPTICS  卷: 15  期: 3  文献号: 035404  DOI: 10.1088/2040-8978/15/3/035404  出版年: MAR 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: With the idea of controlling the polarizations of the pump and Stokes beams in an optical fiber, a simple scheme is presented for enhancing the stability of the stimulated Brillouin scattering (SBS) interaction and thus that of the SBS-based slow light. For this purpose, a special slow-light element is constructed by fusing a polarization-maintaining circulator (its fast axis being blocked) to each terminal of the polarization-maintaining fiber (PMF). This configuration ensures that the pump and Stokes beams always have identical polarization in the whole fiber during the SBS interaction. An experimental setup is established accordingly. The SBS gain feature and the slow-light performance are studied. A tunable time delay with a slope of 0.82 ns dB(-1) is demonstrated for a Gaussian pulse with a width of 88.9 ns. The experimental results with and without polarization management are compared. It is found that such a polarization-managed scheme can improve both the stability of the Brillouin gain and that of the time delay of the Stokes pulse. Moreover, for the same pump power, the Brillouin gain is also enhanced.
文献类型: Article
作者关键词: stimulated Brillouin scattering; polarization-managment; polarization-maintaining fiber; slow light
KeyWords Plus: PHOTONIC-CRYSTAL FIBERS; SINGLE-MODE FIBERS; OPTICAL-FIBER; CHALCOGENIDE FIBER; AMPLIFICATION; DELAY; PUMP; PROPAGATION; GENERATION; SYSTEMS
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 099AK 
ISSN: 2040-8978 
电子 ISSN: 2040-8986 


第 179 条,共 223 条
标题: Opto-digital image encryption by using Baker mapping and 1-D fractional Fourier transform 
作者: Liu, ZJ (Liu, Zhengjun); Li, S (Li, She); Liu, W (Liu, Wei); Liu, ST (Liu, Shutian)
来源出版物: OPTICS AND LASERS IN ENGINEERING  卷: 51  期: 3  页: 224-229  DOI: 10.1016/j.optlaseng.2012.10.008  出版年: MAR 2013  
Web of Science 核心合集中的 "被引频次": 7 
被引频次合计: 9 
摘要: We present an optical encryption method based on the Baker mapping in one-dimensional fractional Fourier transform (1D FrFT) domains. A thin cylinder lens is controlled by computer for implementing 1D FrFT at horizontal direction or vertical direction. The Baker mapping is introduced to scramble the amplitude distribution of complex function. The amplitude and phase of the output of encryption system are regarded as encrypted image and key. Numerical simulation has been performed for testing the validity of this encryption scheme. (c) 2012 Elsevier Ltd. All rights reserved.
文献类型: Article
作者关键词: Scrambling operation; Cryptography; Chaotic mapping
KeyWords Plus: PLAINTEXT ATTACK; POLARIZED-LIGHT; FRESNEL DOMAIN; SCHEME; INTERFERENCE; OPERATION; ROTATION
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 067RH 
ISSN: 0143-8166 


第 180 条,共 223 条
标题: Rainbow trapping of surface plasmon polariton waves in metal-insulator-metal graded grating waveguide 
作者: Zeng, C (Zeng, Chao); Cui, YD (Cui, Yudong)
来源出版物: OPTICS COMMUNICATIONS  卷: 290  页: 188-191  DOI: 10.1016/j.optcom.2012.10.020  出版年: MAR 1 2013  
Web of Science 核心合集中的 "被引频次": 3 
被引频次合计: 3 
摘要: A new metal-insulator-metal (MIM) graded grating waveguide, based on surface plasmon polaritons (SPPs), is proposed and numerically investigated to realize the rainbow trapping of SPP waves. We find that the localized positions of SPP waves depend on the frequencies of the incident light. The theoretical results show that the trapping time of SPP waves can be up to 83.4 fs and the proposed compact configuration can be operated in a broad bandwidth of 90 THz. Our MIM graded grating waveguide may find significant applications on plasmonic slow-light systems, especially chip-based optical buffers and spectrometers. (C) 2012 Elsevier B.V. All rights reserved.
文献类型: Article
作者关键词: Surface plasmon polaritons; Photonic integrated circuits; Graded grating waveguides; Finite-difference time-domain
KeyWords Plus: SLOW-LIGHT; INDUCED TRANSPARENCY; OPTICAL BISTABILITY; NANODISK RESONATORS; METAMATERIALS; REFLECTION; ABSORPTION; COUPLERS; STORAGE; FILTERS
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 058DC 
ISSN: 0030-4018 


第 181 条,共 223 条
标题: All-reflective optical bifocal zooming system without moving elements based on deformable mirror for space camera application 
作者: Zhao, H (Zhao, Hui); Fan, XW (Fan, Xuewu); Zou, GY (Zou, Gangyi); Pang, ZH (Pang, Zhihai); Wang, W (Wang, Wei); Ren, GR (Ren, Guorui); Du, YF (Du, Yunfei); Su, Y (Su, Yu)
来源出版物: APPLIED OPTICS  卷: 52  期: 6  页: 1192-1210  DOI: 10.1364/AO.52.001192  出版年: FEB 20 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: The space camera with variable focal length is capable of capturing images with variable resolution and variable field of view. This is useful for space-borne reconnaissance because the camera can switch between coarse and fine reconnaissance flexibly. However, the traditional optical zooming relies on moving elements which might influence the momentum balance of the satellite platform. Therefore, we present a prototype design using the piezo deformable mirror (PDM) to realize an all-reflective optical bifocal zooming system. By changing the curvature radius of the PDM, the focal length can be switched between 48 and 192 mm without moving elements involved. With the focal length experiencing 4x magnification, the system performance is still approaching diffraction-limited performance, and the maximum stroke of the PDM is also within its physical limits. Experiments demonstrate that the principle is correct and the design is successful. (C) 2013 Optical Society of America
PubMed ID: 23434990 
文献类型: Article
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 094TM 
ISSN: 1559-128X 
电子 ISSN: 2155-3165 


第 182 条,共 223 条
标题: Nondestructive scheme for measuring the attenuation coefficient of polymer optical fiber 
作者: Lin, X (Lin, Xiao); Ren, LY (Ren, Liyong); Liang, J (Liang, Jian)
来源出版物: OPTICS LETTERS  卷: 38  期: 4  页: 528-530  出版年: FEB 15 2013  
Web of Science 核心合集中的 "被引频次": 2 
被引频次合计: 2 
摘要: Based on the fiber macrobending and the refractive index matching technologies, a measurement scheme is proposed to gauge the attenuation coefficient of polymer optical fibers in this Letter. It is noteworthy that, by realizing both the light injecting into and the light extracting out the fiber core via the fiber cladding, this scheme will not induce any destruction during the whole measurement. Some related experiments and the theoretical verifications are given together with the nondestructive measurement principle. The comparison between the experimental results of this scheme and that of the cut-back scheme indicates a good feasibility of our scheme. As a result, it is promised to have a potential application for achieving the on-line attenuation monitoring that has never been introduced. (c) 2013 Optical Society of America
PubMed ID: 23455125 
文献类型: Article
KeyWords Plus: LOSSES
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 099EB 
ISSN: 0146-9592 


第 183 条,共 223 条
标题: Gain-assisted trapping of light in tapered plasmonic waveguide 
作者: Wang, GX (Wang, Guoxi); Lu, H (Lu, Hua); Liu, XM (Liu, Xueming)
来源出版物: OPTICS LETTERS  卷: 38  期: 4  页: 558-560  出版年: FEB 15 2013  
Web of Science 核心合集中的 "被引频次": 10 
被引频次合计: 10 
摘要: We have investigated the slow light and trapping effects in tapered metal-insulator-metal plasmonic waveguides. It is found that a significant reduction of group velocity (<0.01c) can be obtained when considering the intrinsic loss of realistic metal. The theoretical analysis shows that the group velocity can be further decreased, even approach zero in the lossless metallic waveguides. The perfect trapping of light is realized when an appropriate gain material is incorporated in the core layer to compensate metallic loss. The proposed ultracompact configuration may find excellent applications on nanoscale optical storages. (C) 2013 Optical Society of America
PubMed ID: 23455135 
文献类型: Article
KeyWords Plus: ELECTROMAGNETICALLY INDUCED TRANSPARENCY; SLOW LIGHT
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 099EB 
ISSN: 0146-9592 


第 184 条,共 223 条
标题: Empirical mode decomposition based background removal and de-noising in polarization interference imaging spectrometer 
作者: Zhang, CM (Zhang, Chunmin); Ren, WY (Ren, Wenyi); Mu, TK (Mu, Tingkui); Fu, LL (Fu, Lili); Jia, CL (Jia, Chenling)
来源出版物: OPTICS EXPRESS  卷: 21  期: 3  页: 2592-2605  DOI: 10.1364/OE.21.002592  出版年: FEB 11 2013  
Web of Science 核心合集中的 "被引频次": 4 
被引频次合计: 4 
摘要: Based on empirical mode decomposition (EMD), the background removal and de-noising procedures of the data taken by polarization interference imaging interferometer (PIIS) are implemented. Through numerical simulation, it is discovered that the data processing methods are effective. The assumption that the noise mostly exists in the first intrinsic mode function is verified, and the parameters in the EMD thresholding de-noising methods is determined. In comparison, the wavelet and windowed Fourier transform based thresholding de-noising methods are introduced. The de-noised results are evaluated by the SNR, spectral resolution and peak value of the de-noised spectrums. All the methods are used to suppress the effect from the Gaussian and Poisson noise. The de-noising efficiency is higher for the spectrum contaminated by Gaussian noise. The interferogram obtained by the PIIS is processed by the proposed methods. Both the interferogram without background and noise free spectrum are obtained effectively. The adaptive and robust EMD based methods are effective to the background removal and de-noising in PIIS. (C) 2013 Optical Society of America
PubMed ID: 23481716 
文献类型: Article
KeyWords Plus: HILBERT SPECTRUM; DIFFERENCE; VIEW
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 104KJ 
ISSN: 1094-4087 


第 185 条,共 223 条
标题: A compact interferometer insensitive to scanning speed variations 
作者: Yang, QH (Yang, Qinghua); Zhao, BC (Zhao, Baochang); Zeng, XD (Zeng, Xiaodong)
来源出版物: CHINESE OPTICS LETTERS  卷: 11  期: 2  文献号: 021202  DOI: 10.3788/COL201311.021202  出版年: FEB 10 2013  
Web of Science 核心合集中的 "被引频次": 4 
被引频次合计: 4 
摘要: A compact moving optical-wedge interferometer (CMOWI) is presented. This device consists of a moving optical wedge (MOW), a fixed optical wedge (FOW), a fixed compensating plate, and a beam-splitting cube. The optical path difference (OPD) is calculated and analyzed. The factor between the OPD and the displacement of the MOW is less than 1 if the refractive index and wedge angle of the MOW and FOW are chosen properly. Therefore, the CMOWI is insensitive to scanning speed variations compared with the traditional Michelson interferometer. The CMOWI is compact, small-sized, and suitable for low-resolution Fourier transform spectroscopy.
文献类型: Article
KeyWords Plus: SAMPLING ERRORS; FOURIER SPECTROSCOPY
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 118JU 
ISSN: 1671-7694 


第 186 条,共 223 条
标题: Local tomography based on grey model 
作者: Ye, RZ (Ye, Renzhen); Lu, XQ (Lu, Xiaoqiang); Liu, HH (Liu, Haihua)
来源出版物: NEUROCOMPUTING  卷: 101  页: 10-17  DOI: 10.1016/j.neucom.2012.06.006  出版年: FEB 4 2013  
Web of Science 核心合集中的 "被引频次": 2 
被引频次合计: 2 
摘要: This paper studied region-of-interest (ROI) problem of computed tomography. It is necessary to use almost local projection data to reduce radiation exposure or time in medical imaging when only a small part of the patient's body needs to be viewed. Improving the quality of reconstructed ROI and reducing radiation exposure are our aims. However, the traditional local tomography algorithm has difficulty in reconstructing the ROI due to significant truncation artifacts. In this paper, a new grey model based method is reported for ROI image reconstruction from truncated projection data. By using grey model, the proposed method can extrapolate the truncated projection data, and reconstruct the ROI from a set of its projections. As a result, about 75% of full projection data are saved, as compared with other traditional approachs, in reconstructing a local region of 32 pixels in radius in an image of 256 x 256 pixels. Experimental results show that the proposed method exhibits more saving in exposure as compared with other local tomography algorithms and results in better quality of the reconstructed image. (C) 2012 Elsevier B.V. All rights reserved.
文献类型: Article
作者关键词: Computed tomography; Region of interest (ROI); Grey model; Filter matrices; Wavelet
KeyWords Plus: OF-INTEREST TOMOGRAPHY; RADON-TRANSFORM; IMAGE-RECONSTRUCTION; REGION; PROJECTIONS
Web of Science 类别: Computer Science, Artificial Intelligence
研究方向: Computer Science
IDS 号: 052AW 
ISSN: 0925-2312 


第 187 条,共 223 条
标题: Adaptively post-encoding multiple description video coding 
作者: Lan, XG (Lan, Xuguang); Yang, M (Yang, Meng); Yuan, Y (Yuan, Yuan); Zhao, SL (Zhao, Songlin); Zheng, NN (Zheng, Nanning)
来源出版物: NEUROCOMPUTING  卷: 101  页: 149-160  DOI: 10.1016/j.neucom.2012.08.015  出版年: FEB 4 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: In video coding and transmission, the network conditions are crucial, i.e., bandwidth, delay and other factors. However, how to effectively take these factors into account is still a challenge, as heterogeneous networks are dynamic, and therefore it is difficult to predict their changes. This paper first reports a post-encoding of Scalable Multiple Description Coding (SMDC), which is towards self-adaptive video delivery under different conditions of the network. The proposed scheme contains three major steps: (1) spatiotemporal wavelet transformation of input video sequence: (2) context-based adaptive binary arithmetic coding; and (3) rate allocation under the conditions of the network and analysis of the principle relationship of the rate-distortion slope ratio with packet-loss probability in network links. The performance of the SMDC is compared with that of scalable video coding and scalable H.264, and SMDC is demonstrated to effectively optimize the video delivery to adapt to the dynamics of heterogeneous networks. Part of this work has been published on Data Compression Conference 2009 as a short abstract version [37]. (C) 2012 Elsevier B.V. All rights reserved.
文献类型: Article
作者关键词: Multiple description coding; Scalable wavelet coding; Lagrangian rate allocation; Post-encoding
KeyWords Plus: LAGRANGIAN RATE ALLOCATION; ERROR-RESILIENT
Web of Science 类别: Computer Science, Artificial Intelligence
研究方向: Computer Science
IDS 号: 052AW 
ISSN: 0925-2312 


第 188 条,共 223 条
标题: Image registration by normalized mapping 
作者: Wang, Q (Wang, Qi); Zou, CM (Zou, Cuiming); Yuan, Y (Yuan, Yuan); Lu, HB (Lu, Hongbing); Yan, PK (Yan, Pingkun)
来源出版物: NEUROCOMPUTING  卷: 101  页: 181-189  DOI: 10.1016/j.neucom.2012.08.012  出版年: FEB 4 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: A new non-rigid registration method is proposed for the bladder magnetic resonance (MR) images. The key point is normalized mapping, which transforms any image into an intermediate space. Under the uniform space, those anatomical feature points of different images are corresponded by rotating and scaling. In addition, the non-rigid registration is utilized under the application of groupwise registration. By registering a set of images, an unbiased template can be obtained. Based on this template, the analysis towards the group of images can be easily conducted. Experimental results demonstrate that the proposed method can register accurately the target image to the reference image. (C) 2012 Elsevier B.V. All rights reserved.
文献类型: Article
作者关键词: Non-rigid registration; MR image; Normalized mapping; Groupwise registration; Manifold learning
KeyWords Plus: NONRIGID REGISTRATION; PROBABILISTIC ATLAS; NEURAL-NETWORK; MR-IMAGES; CONSTRUCTION; DEFORMATIONS; BLADDER; MODELS
Web of Science 类别: Computer Science, Artificial Intelligence
研究方向: Computer Science
IDS 号: 052AW 
ISSN: 0925-2312 


第 189 条,共 223 条
标题: Judd-Ofelt Analysis on Trifluoroacetate Europium Complexes for Liquid Laser Media 
作者: She, JB (She Jiang-bo); Li, DD (Li Dong-dong); Gao, F (Gao Fei); Qiao, ZB (Qiao Ze-bang); Liu, HH (Liu Huan-huan); Wei, W (Wei Wei); Peng, B (Peng Bo)
来源出版物: CHEMICAL RESEARCH IN CHINESE UNIVERSITIES  卷: 29  期: 1  页: 166-170  DOI: 10.1007/s40242-013-2046-6  出版年: FEB 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: Four europium trifluoroacetate complexes, Eu(CF3COO)(3)center dot bpy(bpy=2,2'-bipyridine)(1), Eu(CF3COO)(3)center dot phen(phen=1,10-phenanthroline)(2), Eu(CF3COO)(3)center dot 2bp(bp=benzophenone)(3) and Eu(CF3COO)(3)center dot 2tppo(tppo=triphenylphosphine oxide)(4) were synthesized and characterized by elemental analysis, Fourier transform infrared(FTIR) spectroscopy, photoluminescence(PL) spectroscopy and thermogravimetric analysis(TGA). The PL spectra of the complexes at room temperature show the strong typical Eu3+ ion red emission, due to the efficient energy "antenna absorption" of ligands and transitions of Eu3+ ion between D-5(0)-> F-7(J(J=0-4)). The long lifetime and high quantum yield reflect that the multiphonon relaxations by coupling to O-H and C-H vibrations were reduced. According to the photoluminescent spectra, the Judd-Ofelt parameters Omega(2) and Omega(4) of the complexes were calculated and the radiative properties were also presented. The D-5(0) radiative lifetime, quantum yield and the stimulated emission cross-section of the complexes are excellent, which prove that they have promising optical properties for liquid laser. The thermal analyses indicate that they are quite stable to heat.
文献类型: Article
作者关键词: Europium complex; Luminescent property; Judd-Ofelt theory
KeyWords Plus: RARE-EARTH IONS; SPECTROSCOPIC PROPERTIES; EU(III) COMPLEX; TRIPLET-STATE; EU3+; LUMINESCENCE; INTENSITIES; LIGANDS; DESIGN; DEVICE
Web of Science 类别: Chemistry, Multidisciplinary
研究方向: Chemistry
IDS 号: 120JD 
ISSN: 1005-9040 
电子 ISSN: 2210-3171 


第 190 条,共 223 条
标题: Prostate Segmentation in MR Images Using Discriminant Boundary Features 
作者: Yang, MJ (Yang, Meijuan); Li, XL (Li, Xuelong); Turkbey, B (Turkbey, Baris); Choyke, PL (Choyke, Peter L.); Yan, PK (Yan, Pingkun)
来源出版物: IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING  卷: 60  期: 2  页: 479-488  DOI: 10.1109/TBME.2012.2228644  出版年: FEB 2013  
Web of Science 核心合集中的 "被引频次": 2 
被引频次合计: 2 
摘要: Segmentation of the prostate in magnetic resonance image has become more in need for its assistance to diagnosis and surgical planning of prostate carcinoma. Due to the natural variability of anatomical structures, statistical shape model has been widely applied in medical image segmentation. Robust and distinctive local features are critical for statistical shape model to achieve accurate segmentation results. The scale invariant feature transformation (SIFT) has been employed to capture the information of the local patch surrounding the boundary. However, when SIFT feature being used for segmentation, the scale and variance are not specified with the location of the point of interest. To deal with it, the discriminant analysis in machine learning is introduced to measure the distinctiveness of the learned SIFT features for each landmark directly and to make the scale and variance adaptive to the locations. As the gray values and gradients vary significantly over the boundary of the prostate, separate appearance descriptors are built for each landmark and then optimized. After that, a two stage coarse-to-fine segmentation approach is carried out by incorporating the local shape variations. Finally, the experiments on prostate segmentation from MR image are conducted to verify the efficiency of the proposed algorithms.
PubMed ID: 23192474 
文献类型: Article
作者关键词: Discriminant analysis; image feature; prostate segmentation; statistical shape model (SSM)
KeyWords Plus: ACTIVE SHAPE MODEL; CT IMAGES; APPEARANCE
Web of Science 类别: Engineering, Biomedical
研究方向: Engineering
IDS 号: 115KA 
ISSN: 0018-9294 


第 191 条,共 223 条
标题: Femtosecond laser-induced permanent anisotropy in bacteriorhodopsin films and applications in optical data storage 
作者: Yu, XH (Yu, Xianghua); Yao, BL (Yao, Baoli); Lei, M (Lei, Ming); Gao, P (Gao, Peng); Ma, BH (Ma, Baiheng)
来源出版物: JOURNAL OF MODERN OPTICS  卷: 60  期: 4  页: 309-314  DOI: 10.1080/09500340.2013.774067  出版年: FEB 1 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: In polymeric films of bacteriorhodopsin (BR) a photoconversion product named F540-state, which is excited by 790 nm femtosecond laser pulses, is stable either for photochemical reaction or thermal pathway. The optical properties of the F540-state were studied, and Jones-matrix theory was adopted to analyze the photoinduced anisotropy of the F540-state. Based on the permanently photoinduced anisotropy, write-once-read-many (WORM) optical data storage was demonstrated by using two polarization states of femtosecond pulsed laser. Since the polarization information is also written on the storage media, it is impossible to copy it in a common way. This storage technique has a potential application in advanced optical security.
文献类型: Article
作者关键词: bacteriorhodopsin; photoinduced anisotropy; optical data storage
KeyWords Plus: PHOTOINDUCED ANISOTROPY; PROTEIN
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 110MD 
ISSN: 0950-0340 


第 192 条,共 223 条
标题: Eyewear-style three-dimensional endoscope derived from microstructured polymer fiber with the function of image transmission 
作者: Kong, DP (Kong De-Peng); Wang, LL (Wang Li-Li); He, ZQ (He Zheng-Quan); Chu, JR (Chu Jiu-Rong); Ma, T (Ma Tian)
来源出版物: CHINESE PHYSICS B  卷: 22  期: 2  文献号: 020701  DOI: 10.1088/1674-1056/22/2/020701  出版年: FEB 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: A method of fabricating multi-core polymer image fiber is proposed. Image fiber preform is fabricated by stacking thousands of polymer fibers each with a 0.25-mm diameter orderly in a die by only one step. The preform is heated and stretched into image fiber with an outer diameter of 2 mm. Then a portable eyewear-style three-dimensional (3D) endoscope system is designed, fabricated, and characterized. This endoscopic system is composed of two graded index lenses, two pieces of 0.35-m length image guide fibers, and a pair of oculars. It shows good flexibility and portability, and can provide the depth information accordingly.
文献类型: Article
作者关键词: three-dimensional endoscope; image fiber; polymer
KeyWords Plus: RESOLUTION
Web of Science 类别: Physics, Multidisciplinary
研究方向: Physics
IDS 号: 095PP 
ISSN: 1674-1056 


第 193 条,共 223 条
标题: Greedy regression in sparse coding space for single-image super-resolution 
作者: Tang, Y (Tang, Yi); Yuan, Y (Yuan, Yuan); Yan, PK (Yan, Pingkun); Li, XL (Li, Xuelong)
来源出版物: JOURNAL OF VISUAL COMMUNICATION AND IMAGE REPRESENTATION  卷: 24  期: 2  特刊: SI  页: 148-159  DOI: 10.1016/j.jvcir.2012.02.003  出版年: FEB 2013  
Web of Science 核心合集中的 "被引频次": 5 
被引频次合计: 6 
摘要: Based on the assumption about the sparse representation of natural images and the theory of compressed sensing, very promising results about single-image super-resolution were obtained by an excellent algorithm introduced by Yang et al. [45]. However, their success could not be well explained theoretically. The lack of theoretical insight has hindered the further improvement of the algorithm. In this paper, Yang's algorithm is revisited in the view of learning theory. According to this point, Yang's algorithm can be considered as a linear regression method in a special feature space which is named as sparse coding space by us. In fact, it has been shown that Yang's algorithm is a result of optimal linear estimation in sparse coding space. More importantly, our theoretical analysis suggests that Yang's algorithm can be improved by using more flexible regression methods than the linear regression method. Following the idea, a novel single-image super-resolution algorithm which is designed based on the framework of L-2-Boosting is proposed in the paper. The experimental results show the effectiveness of the proposed algorithm by comparing with other methods, which verify our theoretical analysis about Yang's algorithm. (C) 2012 Elsevier Inc. All rights reserved.
文献类型: Article
作者关键词: Image quality improvement; Super-resolution; Sparsity; Nonlinear coding; Machine learning; Empirical risk minimization; Greedy regression; L-2-Boosting
KeyWords Plus: INTERPOLATION; RESOLUTION; ALGORITHM
Web of Science 类别: Computer Science, Information Systems; Computer Science, Software Engineering
研究方向: Computer Science
IDS 号: 088TC 
ISSN: 1047-3203 


第 194 条,共 223 条
标题: Theoretical and Experimental Study on Nonintrusive Light Injection Via Cladding in Plastic Optical Fibers 
作者: Lin, X (Lin, Xiao); Ren, LY (Ren, Liyong); Qu, ES (Qu, Enshi); Liang, J (Liang, Jian); Ju, HJ (Ju, Haijuan)
来源出版物: JOURNAL OF LIGHTWAVE TECHNOLOGY  卷: 31  期: 3  页: 359-365  DOI: 10.1109/JLT.2012.2230434  出版年: FEB 1 2013  
Web of Science 核心合集中的 "被引频次": 2 
被引频次合计: 2 
摘要: Based on the fiber macrobending and the refractive index matching technologies, a novel scheme of nonintrusive light injection, namely, the light signal is injected into the fiber core from the fiber cladding without any destruction, is proposed in plastic optical fibers (POFs). Using the ray-tracing method, a 3-D theoretical model is established to characterize the performance of the light injection. The influences of the fiber bending radius, the light source placement, and the surrounding medium refractive index on the light injection efficiency are investigated and assessed. Meanwhile, correlative experiments have also been conducted to contrast theoretical simulations. The experiment results fit theoretical ones well. This nonintrusive light injection technology in POFs might have many potential applications such as the optical signal uploading and downloading, the optical coupling, and the local area networks.
文献类型: Article
作者关键词: Nonintrusive light injection; optical coupling; optical fiber devices; polymer optical fibers (POFs); ray tracing
KeyWords Plus: BENDING LOSSES; LOSS FORMULA; POWER-FLOW; MULTIMODE; PROPAGATION; SIMULATION; SENSOR; TAP
Web of Science 类别: Engineering, Electrical & Electronic; Optics; Telecommunications
研究方向: Engineering; Optics; Telecommunications
IDS 号: 063LC 
ISSN: 0733-8724 


第 195 条,共 223 条
标题: Image hiding scheme by use of rotating squared sub-image in the gyrator transform domains 
作者: Liu, ZJ (Liu, Zhengjun); Li, S (Li, She); Liu, W (Liu, Wei); Liu, WY (Liu, Wanyu); Liu, ST (Liu, Shutian)
来源出版物: OPTICS AND LASER TECHNOLOGY  卷: 45  页: 198-203  DOI: 10.1016/j.optlastec.2012.07.004  出版年: FEB 2013  
Web of Science 核心合集中的 "被引频次": 11 
被引频次合计: 11 
摘要: An image hiding scheme is proposed based on the scrambling process composed of the rotation of the squared sub-image in the gyrator transform domains. A squared sub-image is first selected from a secret image and is rotated along an axis, which is the center line or diagonal line of the sub-image. The rotation operation will be performed iteratively for utilizing more parameters being regarded as key. Subsequently, the rotated image is converted by gyrator transform into a complex function. The amplitude distribution and phase distribution are scrambled by the rotation process with different parameters. Finally, the encrypted image is obtained by gyrator transform from the rotated complex function. Numerical simulation is given to test the validity of the image encryption algorithm. (c) 2012 Elsevier Ltd. All rights reserved.
文献类型: Article
作者关键词: Scrambling operation; Information security; Gyrator transform
KeyWords Plus: FRACTIONAL FOURIER-DOMAIN; PIXEL SCRAMBLING TECHNIQUE; OPTICAL ENCRYPTION; FRESNEL DOMAIN; PLAINTEXT ATTACK; ARNOLD TRANSFORM; ALGORITHM; OPERATION
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 028DA 
ISSN: 0030-3992 


第 196 条,共 223 条
标题: Influence of three-photon absorption on Mid-infrared cross-phase modulation in silicon-on-sapphire waveguides 
作者: Wang, ZL (Wang, Zhaolu); Liu, HJ (Liu, Hongjun); Huang, N (Huang, Nan); Sun, QB (Sun, Qibing); Wen, J (Wen, Jin); Li, XF (Li, Xuefeng)
来源出版物: OPTICS EXPRESS  卷: 21  期: 2  页: 1840-1848  DOI: 10.1364/OE.21.001840  出版年: JAN 28 2013  
Web of Science 核心合集中的 "被引频次": 7 
被引频次合计: 7 
摘要: The influence of three-photon absorption (3PA) on cross-phase modulation (XPM) effect in the mid-infrared (IR) region is theoretically investigated in silicon-on-sapphire (SOS) waveguides. It is found that the 3PA-induced nonlinear losses in the SOS waveguide will be considerable for the pulse propagation in the wavelength region of 2300 nm-3300 nm when the pump peak intensity is high enough. For the XPM process, the 3PA and 3PA-induced free-carrier effects can affect the spectrum and temporal profiles of the pump and signal pulses for sufficiently high pump peak intensities. Moreover, the XPM-induced frequency shift of signal spectrum is also discussed with different pump peak intensities, and the XPM-induced blue and red shifts are reduced due to 3PA. (C) 2013 Optical Society of America
PubMed ID: 23389168 
文献类型: Article
KeyWords Plus: NONLINEAR POLARIZATION ROTATION; WAVELENGTH CONVERSION; SUPERCONTINUUM GENERATION; 2-PHOTON ABSORPTION; FEMTOSECOND PULSES; PHOTONIC WIRES; DISPERSION; COMPRESSION; IMPACT
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 104JT 
ISSN: 1094-4087 


第 197 条,共 223 条
标题: DMD-based LED-illumination Super-resolution and optical sectioning microscopy 
作者: Dan, D (Dan, Dan); Lei, M (Lei, Ming); Yao, BL (Yao, Baoli); Wang, W (Wang, Wen); Winterhalder, M (Winterhalder, Martin); Zumbusch, A (Zumbusch, Andreas); Qi, YJ (Qi, Yujiao); Xia, L (Xia, Liang); Yan, SH (Yan, Shaohui); Yang, YL (Yang, Yanlong); Gao, P (Gao, Peng); Ye, T (Ye, Tong); Zhao, W (Zhao, Wei)
来源出版物: SCIENTIFIC REPORTS  卷: 3  文献号: 1116  DOI: 10.1038/srep01116  出版年: JAN 23 2013  
Web of Science 核心合集中的 "被引频次": 10 
被引频次合计: 10 
摘要: Super-resolution three-dimensional (3D) optical microscopy has incomparable advantages over other high-resolution microscopic technologies, such as electron microscopy and atomic force microscopy, in the study of biological molecules, pathways and events in live cells and tissues. We present a novel approach of structured illumination microscopy (SIM) by using a digital micromirror device (DMD) for fringe projection and a low-coherence LED light for illumination. The lateral resolution of 90 nm and the optical sectioning depth of 120 mm were achieved. The maximum acquisition speed for 3D imaging in the optical sectioning mode was 1.63107 pixels/second, which was mainly limited by the sensitivity and speed of the CCD camera. In contrast to other SIM techniques, the DMD-based LED-illumination SIM is cost-effective, ease of multi-wavelength switchable and speckle-noise-free. The 2D super-resolution and 3D optical sectioning modalities can be easily switched and applied to either fluorescent or non-fluorescent specimens.
PubMed ID: 23346373 
文献类型: Article
KeyWords Plus: DIGITAL MICROMIRROR DEVICE; SPATIAL LIGHT-MODULATOR; STRUCTURED-ILLUMINATION; FLUORESCENCE MICROSCOPY; RECONSTRUCTION MICROSCOPY; RESOLUTION LIMIT; NANOSCOPY; CELLS
Web of Science 类别: Multidisciplinary Sciences
研究方向: Science & Technology - Other Topics
IDS 号: 078IC 
ISSN: 2045-2322 


第 198 条,共 223 条
标题: Development of a diffuse air-argon plasma source using a dielectric-barrier discharge at atmospheric pressure 
作者: Tang, J (Tang, Jie); Jiang, WM (Jiang, Weiman); Zhao, W (Zhao, Wei); Wang, YS (Wang, Yishan); Li, SB (Li, Shibo); Wang, HJ (Wang, Haojing); Duan, YX (Duan, Yixiang)
来源出版物: APPLIED PHYSICS LETTERS  卷: 102  期: 3  文献号: 033503  DOI: 10.1063/1.4788721  出版年: JAN 21 2013  
Web of Science 核心合集中的 "被引频次": 4 
被引频次合计: 4 
摘要: A stable diffuse large-volume air plasma source was developed by using argon-induced dielectric-barrier discharges at atmospheric pressure. This plasma source can be operated in a filamentary discharge with the average areal power density of 0.27 W/cm(2) and the gas temperature of 315 +/- 3K. Spatial measurement of emission spectrum and temperature indicates that this plasma is uniform in the central region along the transverse direction. It is also found that the formation of diffuse air plasma mainly lies in the creation of sufficient seed electrons by the Penning effect through collisions between two argon or nitrogen metastables at low electric fields. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4788721]
文献类型: Article
KeyWords Plus: GLOW-DISCHARGE; SURFACE-TREATMENT; FILAMENTARY; TRANSITION; REACTORS; PHYSICS
Web of Science 类别: Physics, Applied
研究方向: Physics
IDS 号: 077MU 
ISSN: 0003-6951 


第 199 条,共 223 条
标题: Special issue: Behaviours in video 
作者: Zhou, HY (Zhou, Huiyu); Yuan, Y (Yuan, Yuan); Du, EY (Du, Eliza Y.); Yan, PK (Yan, Pingkun)
来源出版物: NEUROCOMPUTING  卷: 100  特刊: SI  页: 1-2  DOI: 10.1016/j.neucom.2012.04.018  出版年: JAN 16 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
文献类型: Editorial Material
Web of Science 类别: Computer Science, Artificial Intelligence
研究方向: Computer Science
IDS 号: 052CO 
ISSN: 0925-2312 


第 200 条,共 223 条
标题: Transfer learning for pedestrian detection 
作者: Cao, XB (Cao, Xianbin); Wang, Z (Wang, Zhong); Yan, PK (Yan, Pingkun); Li, XL (Li, Xuelong)
来源出版物: NEUROCOMPUTING  卷: 100  特刊: SI  页: 51-57  DOI: 10.1016/j.neucom.2011.12.043  出版年: JAN 16 2013  
Web of Science 核心合集中的 "被引频次": 3 
被引频次合计: 5 
摘要: Most of the existing methods for pedestrian detection work well, only when the following assumption is satisfied: the features extracted from the training dataset and the testing dataset have very similar distributions in the feature space. However, in practice, this assumption does not hold because of the scene complexity and variation. In this paper, a new method is proposed for detecting pedestrians in various scenes based on the transfer learning technique. Our proposed method employs the following two strategies for improving the pedestrian detection performance. First, a new sample screening method based on manifold learning is proposed. The basic idea is to choose samples from the training set, which may be similar to the samples from the unseen scene, and then merge the selected samples into the unseen set. Second, a new classification model based on transfer learning is proposed. The advantage of the classification model is that only a small number of samples need to be used from the unseen scenes. Most of the training samples are still obtained from the training scene, which take up to 90% of the entire training samples. Compared to the traditional pedestrian detection methods, the proposed algorithm can adapt to different scenes for detecting pedestrians. Experiments on two pedestrian detection benchmark datasets, DC and NICTA, showed that the method can obtain better performance as compared to other previous methods. (C) 2012 Elsevier B.V. All rights reserved.
文献类型: Article
作者关键词: Pedestrian detection; Scene change; Manifold learning; Transfer learning
KeyWords Plus: OBJECT DETECTION; TRACKING; SYSTEM
Web of Science 类别: Computer Science, Artificial Intelligence
研究方向: Computer Science
IDS 号: 052CO 
ISSN: 0925-2312 
第 201 条,共 223 条
标题: Low-dose carbon-implanted planar waveguides in Er3+/Yb3+ co-doped silicate glasses 
作者: Liu, CX (Liu, Chun-Xiao); Peng, B (Peng, Bo); Wei, W (Wei, Wei); Cheng, S (Cheng, Shu); Li, WN (Li, Wei-Nan); Guo, HT (Guo, Hai-Tao); Shen, Y (Shen, Yuan)
来源出版物: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS  卷: 295  页: 85-88  DOI: 10.1016/j.nimb.2012.11.010  出版年: JAN 15 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: We report, for the first time to our knowledge, on the fabrication of planar waveguides in Er3+/Vb(3+) co-doped silicate glasses by 6.0 MeV carbon implantation with a dose of 6.0 x 10(14) ions/cm(2). The guiding properties are measured by the prism-coupling and end-face coupling methods with a He-Ne beam. The refractive index profile of the planar waveguide is reconstructed by the reflectivity calculation method, which shows a typical "enhanced well + optical barrier" distribution. The micro-luminescence and Raman investigations reveal that the bulk features are not deteriorated significantly by the carbon implantation in the waveguide, exhibiting possible applications for integrated active photonic devices. Published by Elsevier B.V.
文献类型: Article
作者关键词: Waveguide; Ion implantation; Fluorescence
KeyWords Plus: REFRACTIVE-INDEX PROFILES; ION-IMPLANTATION; PHOSPHATE-GLASS; AMPLIFIERS
Web of Science 类别: Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear
研究方向: Instruments & Instrumentation; Nuclear Science & Technology; Physics
IDS 号: 083QS 
ISSN: 0168-583X 
电子 ISSN: 1872-9584 


第 202 条,共 223 条
标题: The factors of spontaneous parametric down conversion process in BiB3O6 crystal with a broadband pump 
作者: Huo, GW (Huo, Guangwen); Zhang, TY (Zhang, Tongyi); Wan, RG (Wan, Rengang); Cheng, GH (Cheng, Guanghua); Zhao, W (Zhao, Wei)
来源出版物: OPTIK  卷: 124  期: 24  页: 6627-6630  DOI: 10.1016/j.ijleo.2013.05.114  出版年: 2013  
Web of Science 核心合集中的 "被引频次": 2 
被引频次合计: 2 
摘要: We investigate the spontaneous parametric down-conversion (SPDC) process in biaxial nonlinear crystal BiB3O6 (BIBO) with a broadband pump. Under the type I and type II phase-matching conditions, we numerically calculate the influencing factors on SPDC process in BIBO crystal, such as temporal and spatial walk-off, the acceptance angles, and spectral acceptance bandwidth. Comparing the two types of phase-matching, we could conclude that the type II phase-matching in BIBO crystal is better for the SPDC because of zero dispersion and bigger acceptance parameters. These results can be used to construct a system to generate ultra-fast entangled photon pairs. (C) 2013 Elsevier GmbH. All rights reserved.
文献类型: Article
作者关键词: SPDC; Phase-matching; BIBO crystal; Ultra-fast entangled photon pairs
KeyWords Plus: PHASE-MATCHING DIRECTIONS; INTRACAVITY 2ND-HARMONIC GENERATION; 2ND HARMONIC-GENERATION; BISMUTH BORATE BIB3O6; 1.06 MU-M; OPTICAL-CRYSTALS; BIAXIAL CRYSTALS; BIBO CRYSTAL; ENTANGLEMENT; COEFFICIENTS
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 261SU 
ISSN: 0030-4026 


第 203 条,共 223 条
标题: Effect of turbulence on visibility and signal-to-noise ratio of lensless ghost imaging with thermal light 
作者: Yao, YP (Yao, Yin-Ping); Wan, RG (Wan, Ren-Gang); Zhang, SW (Zhang, Shi-Wei); Zhang, TY (Zhang, Tong-Yi)
来源出版物: OPTIK  卷: 124  期: 24  页: 6973-6977  DOI: 10.1016/j.ijleo.2013.05.184  出版年: 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: Lensless ghost imaging with thermal light through turbulent atmosphere is investigated. Based on the extended Huygens-Fresnel integral and the classical optical coherence theory, we derive the expressions for the visibility and signal-to-noise ratio (SNR) of lensless ghost imaging through turbulence. To show the effect of turbulence on the quality of lensless ghost imaging, we numerically calculate the visibility and SNR for different propagation distances and various turbulence strengths. Though turbulence degrades the image quality, specific visibility and SNR can be obtained for ghost imaging in certain propagation distances. (C) 2013 Elsevier GmbH. All rights reserved.
文献类型: Article
作者关键词: Lensless ghost imaging; Visibility; Signal-noise-rote ratio (SNR); Turbulence
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 261SU 
ISSN: 0030-4026 


第 204 条,共 223 条
标题: Resonant modes in photonic multiple quantum well structures with single-negative materials 
作者: Kang, YQ (Kang, Yongqiang); Zhang, CM (Zhang, Chunmin)
来源出版物: OPTIK  卷: 124  期: 22  页: 5430-5433  DOI: 10.1016/j.ijleo.2013.03.143  出版年: 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: A type of photonic multiple quantum well (PMQWs) structure made of two different photonic crystals (PCs) with two kinds of single-negative materials is investigated. It is demonstrated by transfer matrix method that omnidirectional resonance modes are generated. The number of the resonance modes can be controlled by adjusting the periodic structure of the constituents. The resonance tunneling modes are weak dependence on incident angle and the scaling of the barrier photonic crystals. When the losses are taken into account, the effects of the losses coming from ENG media and MNG media on the resonance modes are striking difference. (C) 2013 Elsevier GmbH. All rights reserved.
文献类型: Article
作者关键词: Photonic crystal; Single-negative material; Photonic quantum well
KeyWords Plus: LEFT-HANDED MATERIALS
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 236YM 
ISSN: 0030-4026 


第 205 条,共 223 条
标题: Synthesis and strong near-infrared fluorescence of LiLa1-xNdx(PO3)(4) nanocrystals with high doping concentrations 
作者: Wang, ZY (Wang, Zhongyue); Cui, XX (Cui, Xiaoxia); Zheng, RL (Zheng, Ruilin); Duan, WK (Duan, Weikuan); Peng, B (Peng, Bo); Wei, W (Wei, Wei)
来源出版物: NANOSCALE  卷: 5  期: 21  页: 10203-10206  DOI: 10.1039/c3nr03367h  出版年: 2013  
Web of Science 核心合集中的 "被引频次": 2 
被引频次合计: 2 
摘要: A series of LiLa1-xNdx(PO3)(4) (LLNP) nanocrystals are synthesized by a combustion method for the first time. With irregular short-rod shapes and an average size of about 70 nm, the LiLa1-xNdx(PO3)(4) nanocrystals exhibit stronger fluorescence emission of 1.8-6.5 times in the doping concentration range of 1 mol% to 100mol% than Nd3+ (2.5 wt%) doped phosphate glass, and have a long lifetime of 122 mu s for the fully doped nanocrystals. Moreover, the LiLa1-xNdx(PO3)(4) nanocrystals show the lowest lifetime decay rate of 5.09 mu s per mol% and a quenching ratio of 10.81%. Considering the above outstanding performances, LiLa1-xNdx(PO3)(4) nanocrystals may have promising applications in optical amplifiers and lasers.
PubMed ID: 24056859 
文献类型: Article
KeyWords Plus: CRYSTAL-STRUCTURE; MU-M; NDP5O14; LASERS
Web of Science 类别: Chemistry, Multidisciplinary; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied
研究方向: Chemistry; Science & Technology - Other Topics; Materials Science; Physics
IDS 号: 235ZH 
ISSN: 2040-3364 
电子 ISSN: 2040-3372 


第 206 条,共 223 条
标题: Numerical analysis of Ytterbium-doped double-clad fiber lasers based on the temperature-dependent rate equation 
作者: Shao, HM (Shao, Hongmin); Duan, KL (Duan, Kailiang); Zhu, YG (Zhu, Yonggang); Yan, HW (Yan, Hongwei); Yang, HN (Yang, Hening); Zhao, W (Zhao, Wei)
来源出版物: OPTIK  卷: 124  期: 20  页: 4336-4340  DOI: 10.1016/j.ijleo.2013.02.017  出版年: 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: The effects of temperature on the output power and optimal conditions of Ytterbium-doped double-cladding fiber lasers (YDDFLs) are discussed. Temperature-dependent rate equations for YDDFLs based on Boltzmann distribution are built in two-end pump model. The results show that the output power and the slope efficiency decrease with the increase of temperature. The increase of pump power results in that the effect of the temperature on the output performance increases, and the fiber length is a factor that the effect of the temperature depends on really. Moreover we combine the heat distribution formula with the rate equations and compare the numerical results considering with that not considering the temperature-dependence inside laser cavity, the effect of temperature can be ignored only when the pump power is lower, and the optimal fiber length becomes longer when considering the temperature-dependence. (c) 2013 Elsevier GmbH. All rights reserved.
文献类型: Article
作者关键词: Ytterbium-doped fiber laser; Rate equation; Temperature-dependence
KeyWords Plus: POWER
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 231UY 
ISSN: 0030-4026 


第 207 条,共 223 条
标题: Laser contrast enhancement by non-collinear optical Kerr effect of CS2 
作者: Wu, DK (Wu, Dengke); He, JF (He, Junfang); Wang, YS (Wang, Yishan); Wu, Z (Wu, Zhen); Zhao, W (Zhao, Wei)
来源出版物: OPTIK  卷: 124  期: 16  页: 2411-2413  DOI: 10.1016/j.ijleo.2012.08.006  出版年: 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: A pulse contrast enhancement method for lasers with a low initial contrast is presented based on non-collinear optical Kerr effect of CS2. The optical Kerr gate is used as a temporal filter to achieve a "cleaner" laser pulse. A pulse contrast enhancement factor of 10(4) is expected, with a maximum transmittance of the optical Kerr gate reaching 26%. Measurement of the pulse duration and profile has proved that this method introduces slight changes in the pulse. (C) 2012 Elsevier GmbH. All rights reserved.
文献类型: Article
作者关键词: Laser contrast; Nonlinear optics; Ultrashort laser
KeyWords Plus: POLARIZED WAVE GENERATION; PULSES
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 199SF 
ISSN: 0030-4026 


第 208 条,共 223 条
标题: Numerical modeling and design of mid-infrared FBG with high reflectivity 
作者: Chen, Y (Chen, Yu); Li, JF (Li, Jianfeng); Yang, Y (Yang, Yi); Chen, M (Chen, Ming); Li, J (Li, Jing); Luo, HY (Luo, Hongyu)
来源出版物: OPTIK  卷: 124  期: 16  页: 2565-2568  DOI: 10.1016/j.ijleo.2012.07.016  出版年: 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: Based on the coupled-mode equations and transfer matrix theory, the reflective spectrums of a silica FBG centered at 1.9 mu m and a fluoride FBG centered at 2.8 mu m with different length and refractive index perturbation were calculated, respectively. The results show that the peak reflectivity and the spectrum width increase and decrease with the increasing FBG length, respectively. An increase in refractive index disturbance quantity results in the increase of both reflective peak and spectrum width. Above 99% reflectivity with the spectrum width of similar to 0.6 nm can be achieved for the silica FBG at 1.9 mu m when the length and refractive index perturbation are chosen in the range of 4.3-6.4 mm and 4.32 x 10(-4)-5.36 x 10(-4), respectively. For the fluoride FBG at 2.8 mu m, above 99% of the reflectivity with the spectrum width of similar to 0.75 nm can be achieved when the length and disturbance of refractive index are in the range of 6.0-8.0 mm and 4.53 x 10(-4)-6.0 x 10(-4). (C) 2012 Elsevier GmbH. All rights reserved.
文献类型: Article
作者关键词: Mid-infrared fiber laser; FBG; Apodized fiber grating; Fluoride fiber
KeyWords Plus: FLUORIDE FIBER LASER; 2.94 MU-M; BRAGG GRATINGS
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 199SF 
ISSN: 0030-4026 


第 209 条,共 223 条
标题: Optical properties of Yb3+-doped silicate glasses waveguides formed by low-dose oxygen ion implantation and effects of annealing 
作者: Liu, CX (Liu, Chun-Xiao); Cheng, S (Cheng, Shu); Guo, HT (Guo, Hai-Tao); Li, WN (Li, Wei-Nan); Wei, W (Wei, Wei); Peng, B (Peng, Bo)
来源出版物: OPTIK  卷: 124  期: 14  页: 1783-1786  DOI: 10.1016/j.ijleo.2012.05.019  出版年: 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: The planar waveguide, to our knowledge, has been firstly fabricated in the Yb3+-doped silicate glass by 6.0 MeV O3+ ion implantation at a dose of 6 x 10(14) ions/cm(2). The guiding properties are characterized by the prism-coupling and end-face coupling methods with a He-Ne beam. The dark-mode Spectra and near-field intensity distribution are measured before and after annealing at 250 C for 1 h in air. The results indicate that the thermal treatment can enhance the propagation properties with preserving the effective refractive indices well. The refractive index profile of the planar waveguide is reconstructed by the reflectivity calculation method, which shows a typical "enhanced well + optical barrier" distribution. The SRIM'2006 code is carried out to simulate the energy loss during the implantation in order to obtain a better understanding of the waveguide formation. (C) 2012 Elsevier GmbH. All rights reserved.
文献类型: Article
作者关键词: Waveguide; Ion implantation; Annealing; Laser materials
KeyWords Plus: PROFILES
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 180LZ 
ISSN: 0030-4026 


第 210 条,共 223 条
标题: The System Power Control Unit Based on the On-Chip Wireless Communication System 
作者: Li, TF (Li, Tiefeng); Ma, CW (Ma, Caiwen); Li, WH (Li, WenHua)
来源出版物: SCIENTIFIC WORLD JOURNAL  文献号: 939254  DOI: 10.1155/2013/939254  出版年: 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: Currently, the on-chip wireless communication system(OWCS) includes 2nd-generation (2G), 3rd-generation (3G), and long-term evolution (LTE) communication subsystems. To improve the power consumption of OWCS, a typical architecture design of system power control unit (SPCU) is given in this paper, which can not only make a 2G, a 3G, and an LTE subsystems enter sleep mode, but it can also wake them up from sleep mode via the interrupt. During the sleep mode period, either the real-time sleep timer or the global system for mobile (GSM) communication sleep timer can be used individually to arouse the corresponding subsystem. Compared to previous sole voltage supplies on the OWCS, a 2G, a 3G, or an LTE subsystem can be independently configured with three different voltages and frequencies in normal work mode. In the meantime, the voltage supply monitor, which is an important part in the SPCU, can significantly guard the voltage of OWCS in real time. Finally, the SPCU may implement dynamic voltage and frequency scaling (DVFS) for a 2G, a 3G, or an LTE subsystem, which is automatically accomplished by the hardware.
文献类型: Review
KeyWords Plus: MANAGEMENT
Web of Science 类别: Multidisciplinary Sciences
研究方向: Science & Technology - Other Topics
IDS 号: 162OA 
ISSN: 1537-744X 


第 211 条,共 223 条
标题: Theoretical study of stimulated Brillouin scattering in high-power dual-clad fiber lasers 
作者: Yang, HN (Yang, Hening); Duan, KL (Duan, Kailiang); Zhao, BY (Zhao, Baoyin); Zhang, ET (Zhang, Entao)
来源出版物: OPTIK  卷: 124  期: 11  页: 1049-1052  DOI: 10.1016/j.ijleo.2013.01.010  出版年: 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: A theoretical analysis of stimulated Brillouin scattering (SBS) in linear cavity Yb3+ doped dual-clad fiber lasers is presented by solving the steady-state rate equations with SBS included. Solutions to suppress the detrimental effect in the fiber laser are discussed. It is shown that the first-order Stokes initiated by forward and backward pump light changes exponentially along the fiber, and laser power reduces greatly in the presence of SBS under bidirectional end pump. Furthermore, it is found that the SBS threshold power can be improved effectively by using large mode area fiber and shortening the cavity length. (C) 2013 Elsevier GmbH. All rights reserved.
文献类型: Article
作者关键词: Stimulated Brillouin scattering; Fiber lasers; Ytterbium; Stokes wave
KeyWords Plus: MODE OPTICAL-FIBERS; RAMAN
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 148MQ 
ISSN: 0030-4026 


第 212 条,共 223 条
标题: Long-term stable bright amplitude-squeezed state of light at 1064 nm for quantum imaging 
作者: Feng, F (Feng, Fei); Bi, SW (Bi, Si Wen); Lu, BZ (Lu, Bao Zhu); Kang, MH (Kang, Meng Hua)
来源出版物: OPTIK  卷: 124  期: 11  页: 1070-1073  DOI: 10.1016/j.ijleo.2013.01.005  出版年: 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: Bright amplitude-squeezed light at 1064 nm is generated with excellent long-term stability by utilizing the degenerate optical parametric amplifier (OPA) based on periodically poled KTiOPO4 (PPKTP) crystal. Amplitude noise reduction of as much as -5.5 dB is observed directly at an output power of 0.3 mW. This corresponds to a squeezing of -6.22 dB in the beam, the detection efficiency and the propagation efficiency are taken into account. The average value of the detected noise reduction in continuous operation over 5 h is -3.8 dB by locking the cavity length of the OPA. The squeezed state light is applied for imaging of virtual object. The experimental results indicate that the obtained image is more distinct and has less distortion compared to that obtained by infrared coherent light. (c) 2013 Elsevier GmbH. All rights reserved.
文献类型: Article
作者关键词: Squeezed light; Continuous operation; Self-balanced homodyne detection; Quantum imaging
KeyWords Plus: GENERATION; MICROSCOPY; RESOLUTION; DB
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 148MQ 
ISSN: 0030-4026 


第 213 条,共 223 条
标题: FAR-FIELD TUNABLE NANO-FOCUSING BASED ON METALLIC SLITS SURROUNDED WITH NONLINEAR-VARIANT WIDTHS AND LINEAR-VARIANT DEPTHS OF CIRCULAR DIELECTRIC GRATING 
作者: Cao, PF (Cao, Peng-Fei); Cheng, L (Cheng, Ling); Zhang, XP (Zhang, Xiao-Ping); Lu, WP (Lu, Wei-Ping); Kong, WJ (Kong, Wei-Jie); Liang, XW (Liang, Xue-Wu)
来源出版物: PROGRESS IN ELECTROMAGNETICS RESEARCH-PIER  卷: 138  页: 647-660  DOI: 10.2528/PIER13011904  出版年: 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: In this work, we present a new design of a tunable nanofocusing lens using a circular grating of linear-variant depths and nonlinear-variant widths. Constructive interference of cylindrical surface plasmon launched by the subwavelength metallic structure forms a subdiffraction-limited focus, the focal length can be adjusted by varying the geometry of each groove in the circular grating. According to the numerical calculation, the range of focusing points shift is much more than other plasmonic lens, and the relative phase of emitting light scattered by surface plasmon coupling circular grating can be modulated by the nonlinear-variant width and linear-variant depth. The simulation result indicates that the different relative phase of emitting light lead to variant focal length. We firstly show a unique phenomenon for the linear-variant depths and nonlinear-variant widths of the circular grating that the positive change and negative change of the depths and widths of grooves can result in different of variation trend between relative phases and focal lengths. These results paved the road for utilizing the plasmonic lens in high-density optical storage, nanolithography, superresolution optical microscopic imaging, optical trapping, and sensing.
文献类型: Article
KeyWords Plus: SURFACE-PLASMONS; SUPERRESOLUTION ENHANCEMENT; APERTURE; TRANSMISSION; SUPERLENS; LIGHT; LENS
Web of Science 类别: Engineering, Electrical & Electronic; Physics, Applied; Telecommunications
研究方向: Engineering; Physics; Telecommunications
IDS 号: 131AR 
ISSN: 1559-8985 


第 214 条,共 223 条
标题: Systemic optimization of linear cavity Yb-doped double-clad fiber laser 
作者: Liu, JL (Liu, Jinglin); Zhao, CJ (Zhao, Chujun); Hu, HL (Hu, Huanlong); Shuai, CJ (Shuai, Cijun)
来源出版物: OPTIK  卷: 124  期: 9  页: 793-797  DOI: 10.1016/j.ijleo.2012.02.007  出版年: 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: In order to optimize the double-clad fiber laser system, the laser output power should be as large as possible and the systemic cost should be as cheap as possible under the condition of the optimum fiber length. In this work, the improved approximate analytical solutions of the optimum fiber length and the laser output power are obtained based on the model of linear cavity strongly pumped Yb-doped double-clad fiber laser. And the effects of the laser scattering loss, the pump power, Yb dopant concentration, and the reflection coefficients of the input and output mirrors at laser wavelength on the laser output power and the optimum fiber length are discussed and analyzed in detail. Thereby the optimal laser system can be determined. (C) 2012 Elsevier GmbH. All rights reserved.
文献类型: Article
作者关键词: Systemic optimization; Optimum fiber length; Laser output power
KeyWords Plus: AMPLIFIERS
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 132GT 
ISSN: 0030-4026 


第 215 条,共 223 条
标题: Photo-thermal sensitive characters and reflective index variation of photo-thermo-reflective glass 
作者: Li, DC (Li, Dancui); Li, WN (Li, Weinan); Lu, M (Lu, Min); Wang, PF (Wang, Pengfei)
来源出版物: OPTOELECTRONICS AND ADVANCED MATERIALS-RAPID COMMUNICATIONS  卷: 7  期: 1-2  页: 37-42  出版年: JAN-FEB 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: The photo-thermo-reflective (PTR) glass is fabricated by the high temperature and melting process. The sample is characterized by differential scanning calorimetry (DSC), Ultraviolet- visible-near infrared spectroscopy, and X-ray diffraction (XRD). The experiment results show that NaF crystal is deposited in glass, the amount and the size of crystal phase precipitation can be achieved by controlling exposure dosage and time, thermal development temperature and time. At the same time, the reflective-index variation, about 5x10(-4), was measured by interference measuring method.
文献类型: Article
作者关键词: PTR glass; Exposure and thermal development; Reflective index variation
KeyWords Plus: POLYCHROMATIC GLASS; REFRACTIVE-INDEX; CRYSTALLIZATION
Web of Science 类别: Materials Science, Multidisciplinary; Optics
研究方向: Materials Science; Optics
IDS 号: 110GU 
ISSN: 1842-6573 


第 216 条,共 223 条
标题: Broadband Tunable All-Fiber Polarization Interference Filter Based on 45 degrees Tilted Fiber Gratings 
作者: Yan, ZJ (Yan, Zhijun); Wang, HS (Wang, Hushan); Zhou, KM (Zhou, Kaiming); Wang, YS (Wang, Yishan); Zhao, W (Zhao, Wei); Zhang, L (Zhang, Lin)
来源出版物: JOURNAL OF LIGHTWAVE TECHNOLOGY  卷: 31  期: 1  页: 94-98  DOI: 10.1109/JLT.2012.2225022  出版年: JAN 1 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 2 
摘要: We have theoretically and experimentally designed and demonstrated an all-fiber polarization interference filter (AFPIF), which is formed by a polarization-maintaining (PM) fiber cavity structure utilizing two 45 degrees tilted fiber gratings (45 degrees-TFGs) inscribed by UV laser on the PM fiber. Such a filter could generate modulated transmission of linear polarization status. It has been revealed that the modulation depth of the transmission depends on the coupling angle between the 45 degrees-TFGs and the PM fiber cavity. When the two 45 degrees-TFGs in PM fiber are oriented at 45 degrees to the principal axis of the PM fiber cavity, the maximum modulation depth is achievable. Due to the thermal effect on birefringence of the PM fiber, the AFPIF can be tuned over a broad wavelength range just by simple thermal tuning of the cavity. The experiment results show that the temperature tuning sensitivity is proportional to the length ratio of the PM fiber cavity under heating. For 18 and 40 cm long cavities with 6 cm part under heating, the thermal tuning sensitivities are 0.616 and 0.31 nm/degrees C, respectively, which are almost two orders of magnitude higher than normal fiber Bragg gratings.
文献类型: Article
作者关键词: Filter; polarization interference; tunable filter
KeyWords Plus: LYOT FILTER; MAINTAINING FIBER; BRAGG GRATINGS; LASER; SPECTROSCOPY; TEMPERATURE; STRAIN
Web of Science 类别: Engineering, Electrical & Electronic; Optics; Telecommunications
研究方向: Engineering; Optics; Telecommunications
IDS 号: 096NP 
ISSN: 0733-8724 


第 217 条,共 223 条
标题: Visual-Textual Joint Relevance Learning for Tag-Based Social Image Search 
作者: Gao, Y (Gao, Yue); Wang, M (Wang, Meng); Zha, ZJ (Zha, Zheng-Jun); Shen, JL (Shen, Jialie); Li, XL (Li, Xuelong); Wu, XD (Wu, Xindong)
来源出版物: IEEE TRANSACTIONS ON IMAGE PROCESSING  卷: 22  期: 1  页: 363-376  DOI: 10.1109/TIP.2012.2202676  出版年: JAN 2013  
Web of Science 核心合集中的 "被引频次": 31 
被引频次合计: 32 
摘要: Due to the popularity of social media websites, extensive research efforts have been dedicated to tag-based social image search. Both visual information and tags have been investigated in the research field. However, most existing methods use tags and visual characteristics either separately or sequentially in order to estimate the relevance of images. In this paper, we propose an approach that simultaneously utilizes both visual and textual information to estimate the relevance of user tagged images. The relevance estimation is determined with a hypergraph learning approach. In this method, a social image hypergraph is constructed, where vertices represent images and hyperedges represent visual or textual terms. Learning is achieved with use of a set of pseudo-positive images, where the weights of hyperedges are updated throughout the learning process. In this way, the impact of different tags and visual words can be automatically modulated. Comparative results of the experiments conducted on a dataset including 370+ images are presented, which demonstrate the effectiveness of the proposed approach.
PubMed ID: 22692911 
文献类型: Article
作者关键词: Hypergraph learning; social image search; tag; visual-textual
KeyWords Plus: HYPER-GRAPHS; RETRIEVAL; RECOGNITION; FEATURES
Web of Science 类别: Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic
研究方向: Computer Science; Engineering
IDS 号: 062AR 
ISSN: 1057-7149 


第 218 条,共 223 条
标题: Effects of Al2O3 on the thermal stability, glass configuration of Yb3+-doped TeO2-K2O-ZnO-Al2O3 based tellurite laser glasses 
作者: Wang, PF (Wang, Pengfei); Wang, CC (Wang, Cuicui); Li, WN (Li, Weinan); Lu, M (Lu, Min); Peng, B (Peng, Bo)
来源出版物: JOURNAL OF NON-CRYSTALLINE SOLIDS  卷: 359  页: 5-8  DOI: 10.1016/j.jnoncrysol.2012.09.031  出版年: JAN 1 2013  
Web of Science 核心合集中的 "被引频次": 6 
被引频次合计: 6 
摘要: A novel of Yb3+-doped TeO2-K2O-ZnO-Al2O3-based tellurite glasses with both good thermal stability and high-emission cross-section was prepared by verifying Al2O3 additions. The changes in the thermal stability parameter Delta T (= T-x - T-g) and glass network configuration were investigated using differential scanning calorimeter (DSC) and Raman spectra measurements. DSC results show that the investigated tellurite glasses have favorite thermal stability for fiber drawing, and the maximum value of Delta T is up to 150 degrees C. Raman spectra analysis indicates that the introduction of Al2O3 changes the polyhedron structural units of Te from TeO4 to TeO3+1, and in a further step to TeO3 configuration. The substitution of ZnO by Al2O3 increases the glass's network connectivity, resulting in improvement of the glass's thermal stability and increase of the emission cross-section of Yb3+ ions in the glasses. (C) 2012 Elsevier B.V. All rights reserved.
文献类型: Article
作者关键词: Tellurite laser glass; Polyhedron structural units; Thermal stability; Emission cross-section; Raman spectra
KeyWords Plus: EMISSION CROSS-SECTION; SPECTROSCOPIC PROPERTIES; UP-CONVERSION; ABSORPTION; FLUORESCENCE; FIBER; OXIDE; YB3+
Web of Science 类别: Materials Science, Ceramics; Materials Science, Multidisciplinary
研究方向: Materials Science
IDS 号: 062IZ 
ISSN: 0022-3093 


第 219 条,共 223 条
标题: A photocatalytic reactor derived from microstructured polymer optical fiber preform 
作者: Li, DD (Li, Dongdong); Wang, LL (Wang, Lili); Zhang, GJ (Zhang, Gongjian)
来源出版物: OPTICS COMMUNICATIONS  卷: 286  页: 182-186  DOI: 10.1016/j.optcom.2012.08.092  出版年: JAN 1 2013  
Web of Science 核心合集中的 "被引频次": 1 
被引频次合计: 1 
摘要: This paper reports a novel photocatalytic reactor having 547 pieces of TiO2 nanocrystal-film-modified capillaries, which is derived from a microstructured polymer optical fiber (MPOF) preform. The photocatalytic active TiO2 nanocrystal film is obtained by microwave processing of the TiO2 gel films in the MPOF preform. The MPOF preform not only plays a role as a light-transmitting media, also a TiO2 supporting and waste-water pipe to supply for photocatalytic degradation of toxic organic solute. The photocatalytic reactor has so large surface area for TiO2 loading that photodegradation efficiency is enhanced. As far as we know, the photocatalytic reactor based on the super-multi channels capillary waveguide arrays has not been reported before. (C) 2012 Elsevier B.V. All rights reserved.
文献类型: Article
作者关键词: Photocatalytic; Multichannel reactor; Microstructured polymer optical fiber preform
KeyWords Plus: WASTE-WATER TREATMENT; HYDROGEN-PEROXIDE; MONOLITH REACTOR; DEGRADATION; TIO2; DYES; DECOLORIZATION; MINERALIZATION; PURIFICATION; ENHANCEMENT
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 056DZ 
ISSN: 0030-4018 


第 220 条,共 223 条
标题: Multi-spectral saliency detection 
作者: Wang, Q (Wang, Qi); Yan, PK (Yan, Pingkun); Yuan, Y (Yuan, Yuan); Li, XL (Li, Xuelong)
来源出版物: PATTERN RECOGNITION LETTERS  卷: 34  期: 1  特刊: SI  页: 34-41  DOI: 10.1016/j.patrec.2012.06.002  出版年: JAN 1 2013  
Web of Science 核心合集中的 "被引频次": 19 
被引频次合计: 19 
摘要: Visual saliency detection has been applied in many tasks in the fields of pattern recognition and computer vision, such as image segmentation, object recognition, and image retargeting. However, the accurate detection of saliency remains a challenge. The reasons behind this are that: (1) well-defined mechanism for saliency definition is rarely established; and (2) supporting information for detecting saliency is limited in general. In this paper, a multi-spectrum based saliency detection algorithm is proposed. Instead of only using the conventional RGB information as what existing algorithms do, this work incorporates near-infrared clues into the detection framework. Features of color and texture from both types of image modes are explored simultaneously. When calculating the color contrast, an effective color component analysis method is employed to produce more precise results. With respect to the texture analysis, texton representation is adopted for fast processing. Experiments are done to compare the proposed algorithm with other 11 state-of-the-art algorithms and the results indicate that our algorithm outperforms the others. (C) 2012 Elsevier B.V. All rights reserved.
文献类型: Article
作者关键词: Saliency; Near-infrared; Multi-spectral; Texton; Color
KeyWords Plus: REGION DETECTION; IMAGE SEGMENTATION; VISUAL-ATTENTION
Web of Science 类别: Computer Science, Artificial Intelligence
研究方向: Computer Science
IDS 号: 048QM 
ISSN: 0167-8655 


第 221 条,共 223 条
标题: Heterogeneous image transformation 
作者: Wang, NN (Wang, Nannan); Li, J (Li, Jie); Tao, DC (Tao, Dacheng); Li, XL (Li, Xuelong); Gao, XB (Gao, Xinbo)
来源出版物: PATTERN RECOGNITION LETTERS  卷: 34  期: 1  特刊: SI  页: 77-84  DOI: 10.1016/j.patrec.2012.04.005  出版年: JAN 1 2013  
Web of Science 核心合集中的 "被引频次": 4 
被引频次合计: 4 
摘要: Heterogeneous image transformation (HIT) plays an important role in both law enforcements and digital entertainment. Some available popular transformation methods, like locally linear embedding based, usually generate images with lower definition and blurred details mainly due to two defects: (1) these approaches use a fixed number of nearest neighbors (NN) to model the transformation process, i.e., K-NN-based methods; (2) with overlapping areas averaged, the transformed image is approximately equivalent to be filtered by a low pass filter, which filters the high frequency or detail information. These drawbacks reduce the visual quality and the recognition rate across heterogeneous images. In order to overcome these two disadvantages, a two step framework is constructed based on sparse feature selection (SFS) and support vector regression (SVR). In the proposed model, SFS selects nearest neighbors adaptively based on sparse representation to implement an initial transformation, and subsequently the SVR model is applied to estimate the lost high frequency information or detail information. Finally, by linear superimposing these two parts, the ultimate transformed image is obtained. Extensive experiments on both sketch-photo database and near infrared-visible image database illustrates the effectiveness of the proposed heterogeneous image transformation method. (C) 2012 Elsevier B.V. All rights reserved.
文献类型: Article
作者关键词: Heterogeneous image transformation; Near infrared image; Sketch-photo synthesis; Sparse representation; Support vector regression
KeyWords Plus: FACE SKETCH SYNTHESIS; LARGE UNDERDETERMINED SYSTEMS; RECOGNITION ALGORITHMS; SUPERRESOLUTION; INFORMATION; EQUATIONS
Web of Science 类别: Computer Science, Artificial Intelligence
研究方向: Computer Science
IDS 号: 048QM 
ISSN: 0167-8655 


第 222 条,共 223 条
标题: Tracking vehicles as groups in airborne videos 
作者: Cao, XB (Cao, Xianbin); Shi, ZR (Shi, Zhengrong); Yan, PK (Yan, Pingkun); Li, XL (Li, Xuelong)
来源出版物: NEUROCOMPUTING  卷: 99  页: 38-45  DOI: 10.1016/j.neucom.2012.05.026  出版年: JAN 1 2013  
Web of Science 核心合集中的 "被引频次": 0 
被引频次合计: 0 
摘要: Airborne vehicle tracking system is receiving increasing attention due to its high mobility, low cost and large surveillance scope. However, tracking multiple vehicles simultaneously on airborne platform is a challenging problem, owing to camera vibration, which causes visible frame-to-frame jitter in the airborne videos and uncertain vehicle motion. To address these problems, a new collaborative tracking framework is proposed in this paper. The framework consists of a two-level tracking process to track vehicles as groups. The higher level builds the relevance network and divides target vehicles into different groups, where the relevance is calculated based on the status information of vehicles obtained from the lower level. The proposed group tracking takes into account the relevance between vehicles and reduces the impact of camera vibration. Experimental results demonstrated that the proposed method has better performance in terms of tracking speed and tracking accuracy compared to other existing approaches based on particle filter and stationary grouping. (C) 2012 Elsevier B.V. All rights reserved.
文献类型: Article
作者关键词: Group tracking; Relevance network; Kalman filter; Airborne platforms; Multi-target tracking
KeyWords Plus: VISUAL TRACKING; MEAN SHIFT; OBJECT
Web of Science 类别: Computer Science, Artificial Intelligence
研究方向: Computer Science
IDS 号: 037TL 
ISSN: 0925-2312 
电子 ISSN: 1872-8286 


第 223 条,共 223 条
标题: Image encryption algorithm by using fractional Fourier transform and pixel scrambling operation based on double random phase encoding 
作者: Liu, ZJ (Liu, Zhengjun); Li, S (Li, She); Liu, W (Liu, Wei); Wang, YH (Wang, Yanhua); Liu, ST (Liu, Shutian)
来源出版物: OPTICS AND LASERS IN ENGINEERING  卷: 51  期: 1  页: 8-14  DOI: 10.1016/j.optlaseng.2012.08.004  出版年: JAN 2013  
Web of Science 核心合集中的 "被引频次": 18 
被引频次合计: 18 
摘要: To enhance the security of double random phase encoding, a kind of amplitude scrambling operation is designed and introduced into an image encryption process. The random data of the second phase mask in double random phase encoding is also employed for scrambling amplitude distribution in order to save the space of storage and transmission of the key information. The scrambling operator is changeable for generating the key. Some numerical simulations have been provided for testing the validity of the image encryption scheme. (C) 2012 Elsevier Ltd. All rights reserved.
文献类型: Article
作者关键词: Amplitude encoding; Phase encoding; Image encryption
KeyWords Plus: OPTICAL ENCRYPTION; PLAINTEXT ATTACK; ARNOLD TRANSFORM; POLARIZED-LIGHT; FRESNEL DOMAIN; INTERFERENCE; SCHEME; ROTATION
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 024QT 
ISSN: 0143-8166 

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