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2010年
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第 1 条,共 159 条
标题: Dynamic evolution of temporal dissipative-soliton molecules in large normal path-averaged dispersion fiber lasers
作者: Liu, XM (Liu, Xueming)
来源出版物: PHYSICAL REVIEW A  卷: 82  期: 6  文献号: 063834  DOI: 10.1103/PhysRevA.82.063834  出版年: DEC 28 2010 
Web of Science 核心合集中的 "被引频次": 38
被引频次合计: 39
摘要: The robust dissipative soliton molecules (DSM's) exhibiting as the quasirectangular spectral profile are investigated numerically and observed experimentally in mode-locked fiber lasers with the large normal path-averaged dispersion and the large net cavity dispersion. These DSM's have an independently evolving phase with a pulse duration T-0 of about 20 ps and a peak-to-peak separation of about 8T(0). Under laboratory conditions, the proposed laser delivers vibrating DSM's with an oscillating amplitude of less than a percent of peak separation. Numerical simulations show that DSM's are characterized by a spectral modulation pattern with about a 3-dB modulation depth measured as an averaged value. The experimental observations are in excellent agreement with the numerical predictions.
文献类型: Article
KeyWords Plus: GAIN-GUIDED SOLITONS; SATURABLE-ABSORBER; BOUND-STATES; DOPED FIBER; GENERATION; PAIRS; HYSTERESIS; AMPLIFIERS; EQUATION; CAVITY
Web of Science 类别: Optics; Physics, Atomic, Molecular & Chemical
研究方向: Optics; Physics
IDS 号: 713NZ
ISSN: 1050-2947
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第 2 条,共 159 条
标题: Electron spin dynamics in heavily Mn-doped (Ga,Mn)As
作者: Zhu, YG (Zhu, Yonggang); Han, LF (Han, Lifen); Chen, L (Chen, Lin); Zhang, XH (Zhang, Xinhui); Zhao, JH (Zhao, Jianhua)
来源出版物: APPLIED PHYSICS LETTERS  卷: 97  期: 26  文献号: 262109  DOI: 10.1063/1.3531754  出版年: DEC 27 2010 
Web of Science 核心合集中的 "被引频次": 4
被引频次合计: 4
摘要: Electron spin relaxation and related mechanisms in heavily Mn-doped (Ga,Mn) As are studied by performing time-resolved magneto-optical Kerr effect measurements. At low temperature, s-d exchange scattering dominates electron spin relaxation, whereas the Bir-Aronov-Pikus mechanism and Mn impurity scattering play important roles at high temperature. The temperature-dependent spin relaxation time exhibits an anomaly around the Curie temperature (T(c)) that implies that thermal fluctuation is suppressed by short-range correlated spin fluctuation above T(c). (C) 2010 American Institute of Physics. [doi:10.1063/1.3531754]
文献类型: Article
KeyWords Plus: SEMICONDUCTORS; TEMPERATURE; GAAS
Web of Science 类别: Physics, Applied
研究方向: Physics
IDS 号: 700TV
ISSN: 0003-6951
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第 3 条,共 159 条
标题: Azimuthons in weakly nonlinear waveguides of different symmetries
作者: Zhang, YQ (Zhang, Yiqi); Skupin, S (Skupin, Stefan); Maucher, F (Maucher, Fabian); Pour, AG (Pour, Arpa Galestian); Lu, KQ (Lu, Keqing); Krolikowski, W (Krolikowski, Wieslaw)
来源出版物: OPTICS EXPRESS  卷: 18  期: 26  页: 27846-27857  DOI: 10.1364/OE.18.027846  出版年: DEC 20 2010 
Web of Science 核心合集中的 "被引频次": 9
被引频次合计: 9
摘要: We show that weakly guiding nonlinear waveguides support stable propagation of rotating spatial solitons (azimuthons). We investigate the role of waveguide symmetry on the soliton rotation. We find that azimuthons in circular waveguides always rotate rigidly during propagation and the analytically predicted rotation frequency is in excellent agreement with numerical simulations. On the other hand, azimuthons in square waveguides may experience spatial deformation during propagation. Moreover, we show that there is a critical value for the modulation depth of azimuthons above which solitons just wobble back and forth, and below which they rotate continuously. We explain these dynamics using the concept of energy difference between different orientations of the azimuthon. (C) 2010 Optical Society of America
PubMed ID: 21197058
文献类型: Article
KeyWords Plus: MEDIA; SOLITONS; BEAMS
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 698HF
ISSN: 1094-4087
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第 4 条,共 159 条
标题: The effect of added O-2 on the transmittance and radiation resistance of radiation resistant glasses
作者: Li, WN (Li, Weinan); Lu, M (Lu, Min)
来源出版物: OPTICS EXPRESS  卷: 18  期: 25  页: 26307-26312  DOI: 10.1364/OE.18.026307  出版年: DEC 6 2010 
Web of Science 核心合集中的 "被引频次": 2
被引频次合计: 2
摘要: One method of hardening optical glasses against radiation-induced darkening has been to add CeO2 to the batch composition. In the present investigation we prepared a series of lanthanum crown glasses with varying degrees of CeO2 additions and melted them at 1,400 degrees C with and without bubbling oxygen gas. We examined the influence of added oxygen on the optical transmissions of these glasses in the spectral range 460 to 760 nm following gamma irradiations ranging from 10 to 250 krad. The results showed that dose-for-dose the radiation-induced optical attenuations of the oxidized glasses were greater than for the glasses without added O-2. (C)2010 Optical Society of America
PubMed ID: 21164980
文献类型: Article
KeyWords Plus: SILICA
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 700NE
ISSN: 1094-4087
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第 5 条,共 159 条
标题: Spectral property of two-photon flux generated by four-photon scattering in photonic-crystal fibers
作者: Sun, HB (Sun, Hongbo); Liu, XM (Liu, Xueming); Hu, XH (Hu, Xiaohong); Li, XH (Li, Xiaohui)
来源出版物: OPTICAL ENGINEERING  卷: 49  期: 12  文献号: 125001  DOI: 10.1117/1.3516732  出版年: DEC 2010 
Web of Science 核心合集中的 "被引频次": 0
被引频次合计: 0
摘要: Based on the scalar four-photon scattering process, the quantum state of a lightwave at the output of fiber is derived by solving the nonlinear Schrodinger equation with a perturbation theory. The joint spectral function of two photons is achieved from the derived quantum state. The dispersion operator involves the third-order dispersion term in the case that the pump wavelength is close to the zero dispersion wavelength. Simulation results show the first-order approximation of our joint spectral function is in excellent agreement with the complicated exact solution. By analyzing the spectral property of the two-photon flux generated by four-photon scattering in photonic-crystal fibers, it is found that the sign of dispersion has very little influence on the spectrum except the slight modulation instability in the anomalous dispersion domain. (c) 2010 Society of Photo-Optical Instrumentation Engineers. [DOI: 10.1117/1.3516732]
文献类型: Article
作者关键词: four-photon scattering; two-photon flux; photonic-crystal fibers
KeyWords Plus: ERBIUM-DOPED FIBER; PAIR SOURCE; QUANTUM COMMUNICATIONS; CORRELATED PHOTONS; ENTANGLEMENT; PURITY; STATES; WAVES; LASER
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 700NF
ISSN: 0091-3286
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第 6 条,共 159 条
标题: Gray photorefractive polymeric optical spatial solitons
作者: Lu, KQ (Lu, Keqing); Li, KH (Li, Kehao); Zhang, YP (Zhang, Yanpeng); Yuan, CZ (Yuan, Chenzhi); Miao, CY (Miao, Changyun); Chen, L (Chen, Li); Xu, JJ (Xu, Jingjun)
来源出版物: OPTICS COMMUNICATIONS  卷: 283  期: 23  页: 4741-4748  DOI: 10.1016/j.optcom.2010.06.102  出版年: DEC 1 2010 
Web of Science 核心合集中的 "被引频次": 4
被引频次合计: 4
摘要: We show that gray spatial optical solitons are possible in biased photorefractive polymers under steady-state conditions. We find that for a given material parameter the absolute value of a gray photorefractive polymeric soliton's phase decreases with an increase in the beam's grayness, whereas it increases with the material parameter for a given beam's grayness and that the full width half maximum (FWHM) of the gray soliton beam's intensity increases with the beam's grayness when the normalized background intensity and the material parameter are fixed and decreases with an increase in the normalized background intensity when the material parameter is fixed. On the other hand, we also show that N coupled beam evolution equations in biased photorefractive polymers can exhibit multicomponent gray solitons. These multicomponent gray solitons can be obtained provided that the N coupled beams share the same polarization, wavelength, and are incoherent with one another. The characteristics and stability properties of these multicomponent gray solitons arc also discussed in detail. Crown Copyright (C) 2010 Published by Elsevier B.V. All rights reserved
文献类型: Article
作者关键词: Spatial soliton; Photorefractive polymer; Nonlinear optics
KeyWords Plus: SCREENING SOLITONS; CRYSTALS; MEDIA; BRIGHT; BEAMS; DARK
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 674AF
ISSN: 0030-4018
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第 7 条,共 159 条
标题: High-birefringence negative dispersion effect of novel rectangular lattice photonic crystal fiber
作者: Zhang, YN (Zhang Ya-Ni)
来源出版物: ACTA PHYSICA SINICA  卷: 59  期: 12  页: 8632-8639  出版年: DEC 2010 
Web of Science 核心合集中的 "被引频次": 5
被引频次合计: 7
摘要: A novel rectangular lattice photonic crystal fiber is proposed which is composed of a central defect core and a cladding with square mesh structure by introducing another air hole row between two air hole rows for every other line into a conventional rectangular lattice photonic crystal fiber. Its dispersion, birefringence and confinement loss are numerically investigated by full vector finite element method with anisotropic perfectly matched layers. Numerical results indicate that the proposed fiber shows higher birefringence negative dispersion effect and stronger confinement ability of guided mode, in which the confinement loss is lower than 10(-2) dB.m(-1). The wavelength for high birefringence negative dispersion can be optimized by adjusting the parameters of proposed fiber, such as Lambda and d/Lambda. The dispersion and the dispersion slope are both negative, the birefringence is higher than 10(-2), and nonlinear parameter is close to 55 km(-1) W(-1) over C band (i. e. 1.53-1.565 mu m) under the condition of Lambda = 2.0 mu m and d/Lambda = 0.4. This fiber will have important applications in the fields of polarization maintaining transmission system and dispersion compensation, and also in the design of widely tunable wavelength converter based on four-wave mixing.
文献类型: Article
作者关键词: fiber optics and optical communication; full vector finite element method; high-birefringence negative dispersion; confinement loss
KeyWords Plus: ERBIUM-DOPED FIBER; MICROSTRUCTURED OPTICAL-FIBERS; ELLIPTIC AIR HOLES; SQUARE-LATTICE; BRAGG GRATINGS; POLYMER; DESIGN; TEMPERATURE; LASER
Web of Science 类别: Physics, Multidisciplinary
研究方向: Physics
IDS 号: 712TQ
ISSN: 1000-3290
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第 8 条,共 159 条
标题: Parallel phase-shifting interferometry based on Michelson-like architecture
作者: Min, JW (Min, Junwei); Yao, BL (Yao, Baoli); Gao, P (Gao, Peng); Guo, RL (Guo, Rongli); Zheng, JJ (Zheng, Juanjuan); Ye, T (Ye, Tong)
来源出版物: APPLIED OPTICS  卷: 49  期: 34  页: 6612-6616  DOI: 10.1364/AO.49.006612  出版年: DEC 1 2010 
Web of Science 核心合集中的 "被引频次": 7
被引频次合计: 7
摘要: In this paper, we present a new scheme for parallel phase-shifting interferometry that employs a Michelson-like architecture and a simple polarization unit to generate two phase-shifting interferograms with phase shift of pi/2 at a single camera exposure. The parallel phase-shifting unit is built with simple optical components, and the distance between the parallel interferograms can be adjusted conveniently. Phase reconstruction is performed by using an algorithm developed for two-step phase-shifting interferometry. The practicability of the proposed configuration and the reconstruction method is demonstrated by experiments. (C) 2010 Optical Society of America
PubMed ID: 21124538
文献类型: Article
KeyWords Plus: DIGITAL HOLOGRAPHY; INTERFEROGRAMS; POLARIZATION; MICROSCOPY
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 688DR
ISSN: 1559-128X
电子 ISSN: 2155-3165
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第 9 条,共 159 条
标题: In-Depth Study on Propane-Air Combustion Enhancement With Dielectric Barrier Discharge
作者: Tang, J (Tang, Jie); Zhao, W (Zhao, Wei); Duan, YX (Duan, Yixiang)
来源出版物: IEEE TRANSACTIONS ON PLASMA SCIENCE  卷: 38  期: 12  特刊: SI  页: 3272-3281  DOI: 10.1109/TPS.2010.2084597  子辑: 1  出版年: DEC 2010 
Web of Science 核心合集中的 "被引频次": 6
被引频次合计: 6
摘要: Low-temperature plasmas generated from dielectric barrier discharges (DBDs) play an important role in hydrocarbon combustion reactions. In this paper, two different arrangements of coaxial cylindrical DBD reactors are designed to investigate the enhancement processes of plasma-assisted propane combustion through activating propane and air, respectively. Each reactor corresponds to one kind of activation method. With plasma being on and off, the physical appearances of the propane combustion flame are observed and compared, and the spatial distributions of the flame temperature are measured and comparatively investigated under each activation approach. In addition, some major components such as OH, CH, and C-2 in the combustion flame are identified using flame/plasma emission spectroscopy. The relationship of OH radical concentration with flame position is studied when plasma is on and off, and concentration profiles as well as densities of these major components in the main combustion zone are qualitatively measured and analyzed. Possible physical and chemical reaction mechanisms in the plasma and flame zones are discussed in detail under both activation ways. Experimental results suggest that propane combustion be enhanced with plasma applied on either propane or air stream. A temperature rise of about 30 degrees C is achieved for the activation of propane, but about 50 degrees C is achieved for the activation of air with a 30-W plasma being applied. It denotes that some active species like O-atoms, N-atoms, and excited molecular oxygen and nitrogen produced by activating air components play a greater role than those smaller fragments and radicals generated by cracking propane in plasma-assisted combustion in our experimental conditions.
文献类型: Article
作者关键词: Dielectric barrier discharge (DBD); emission spectroscopy; low-temperature plasma; plasma-assisted combustion
KeyWords Plus: ATMOSPHERIC-PRESSURE; PLASMA; FLAMES; TEMPERATURE; IGNITION; PHYSICS; IONS
Web of Science 类别: Physics, Fluids & Plasmas
研究方向: Physics
IDS 号: 693TE
ISSN: 0093-3813
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第 10 条,共 159 条
标题: Visual-Context Boosting for Eye Detection
作者: Song, ML (Song, Mingli); Tao, DC (Tao, Dacheng); Sun, Z (Sun, Zhuo); Li, XL (Li, Xuelong)
来源出版物: IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS PART B-CYBERNETICS  卷: 40  期: 6  页: 1460-1467  DOI: 10.1109/TSMCB.2010.2040078  出版年: DEC 2010 
Web of Science 核心合集中的 "被引频次": 5
被引频次合计: 5
摘要: Eye detection plays an important role in many practical applications. This paper presents a novel two-step scheme for eye detection. The first step models an eye by a newly defined visual-context pattern (VCP), and the second step applies semisupervised boosting for precise detection. VCP describes both the space and appearance relations between an eye region (region of eye) and a reference region (region of reference). The context feature of a VCP is extracted by using the integral image. Aiming to reduce the human labeling efforts, we apply semisupervised boosting, which integrates the context feature and the Haar-like features for precise eye detection. Experimental results on several standard face data sets demonstrate that the proposed approach is effective, robust, and efficient. We finally show that this approach is ready for practical applications.
PubMed ID: 20172830
文献类型: Article
作者关键词: Eye detection; region of reference (ROR); visual object detection
KeyWords Plus: CLASSIFICATION; FEATURES; SYSTEM
Web of Science 类别: Automation & Control Systems; Computer Science, Artificial Intelligence; Computer Science, Cybernetics
研究方向: Automation & Control Systems; Computer Science
IDS 号: 681ZR
ISSN: 1083-4419
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第 11 条,共 159 条
标题: PERFORMANCE OF DOUBLE SIDEBAND MODULATED PROBE WAVE IN BOTDA DISTRIBUTED FIBER SENSOR
作者: Cui, QS (Cui, Qingsong); Pamukcu, S (Pamukcu, Sibel); Lin, AX (Lin, Aoxiang); Xiao, W (Xiao, Wen); Toulouse, J (Toulouse, Jean)
来源出版物: MICROWAVE AND OPTICAL TECHNOLOGY LETTERS  卷: 52  期: 12  页: 2713-2717  DOI: 10.1002/mop.25566  出版年: DEC 2010 
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 the performance of double sideband (DSB) modulated probe wave in Brillouin optical time domain analysis (BOTDA) distributed fiber sensor. Compared to single sideband (SSB) modulation, along the sensing fiber the pump depletion of DSB modulation is remarkably suppressed in time domain and also has a relatively narrower Brillouin gain spectrum in frequency domain. Both the theoretical simulation and the experimental results demonstrate that the DSB modulation provides potentially longer sensing distance and higher accuracy in measurement than the SSB modulation in the BOTDA distributed fiber sensor system. (C) 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2713-2717,2010: View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25566
文献类型: Article
作者关键词: frequency modulation; fiber optics sensors; stimulated brillouin scattering
KeyWords Plus: STIMULATED BRILLOUIN-SCATTERING; GAIN SPECTRUM ANALYSIS; PULSE; RESOLUTION; BASE
Web of Science 类别: Engineering, Electrical & Electronic; Optics
研究方向: Engineering; Optics
IDS 号: 674OS
ISSN: 0895-2477
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第 12 条,共 159 条
标题: Incremental pairwise discriminant analysis based visual tracking
作者: Wen, J (Wen, Jing); Gao, XB (Gao, Xinbo); Li, XL (Li, Xuelong); Tao, DC (Tao, Dacheng); Li, J (Li, Jie)
来源出版物: NEUROCOMPUTING  卷: 74  期: 1-3  特刊: SI  页: 428-438  DOI: 10.1016/j.neucom.2010.07.014  出版年: DEC 2010 
Web of Science 核心合集中的 "被引频次": 4
被引频次合计: 7
摘要: The distinguishment between the object appearance and the background is the useful cues available for visual tracking in which the discriminant analysis is widely applied However due to the diversity of the background observation there are not adequate negative samples from the background which usually lead the discriminant method to tracking failure Thus a natural solution is to construct an object-background pair constrained by the spatial structure which could not only reduce the neg-sample number but also make full use of the background information surrounding the object However this Idea is threatened by the variant of both the object appearance and the spatial-constrained background observation especially when the background shifts as the moving of the object Thus an Incremental pairwise discriminant subspace is constructed in this paper to delineate the variant of the distinguishment In order to maintain the correct the ability of correctly describing the subspace we enforce two novel constraints for the optimal adaptation (1) pairwise data discriminant constraint and (2) subspace smoothness The experimental results demonstrate that the proposed approach can alleviate adaptation drift and achieve better visual tracking results for a large variety of nonstationary scenes (C) 2010 Elsevier B V All rights reserved
文献类型: Article
作者关键词: Pairwise discriminant analysis; Log Euclidean Riemannian; Incremental learning; Visual tracking
KeyWords Plus: IMAGE RETRIEVAL; OBJECT TRACKING; SUBSPACE; RECOGNITION
Web of Science 类别: Computer Science, Artificial Intelligence
研究方向: Computer Science
IDS 号: 701GG
ISSN: 0925-2312
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第 13 条,共 159 条
标题: Vectorial structure of a hard-edged-diffracted four-petal Gaussian beam in the far field
作者: Long, XW (Long, Xuewen); Lu, KQ (Lu, Keqing); Zhang, YH (Zhang, Yuhong); Guo, JB (Guo, Jianbang); Li, KH (Li, Kehao)
来源出版物: OPTICS COMMUNICATIONS  卷: 283  期: 23  页: 4586-4593  DOI: 10.1016/j.optcom.2010.06.097  出版年: DEC 1 2010 
Web of Science 核心合集中的 "被引频次": 3
被引频次合计: 3
摘要: Based on the vector angular spectrum method and the stationary phase method and the fact that a circular aperture function can be expanded into a finite sum of complex Gaussian functions, the analytical vectorial structure of a four-petal Gaussian beam (FPGB) diffracted by a circular aperture is derived in the far field The energy flux distributions and the diffraction effect introduced by the aperture are studied and illustrated graphically. Moreover, the influence of the f-parameter and the truncation parameter on the non-paraxiality is demonstrated in detail. In addition, the approximate formulas obtained in this paper can degenerate into un-apertured case when the truncation parameter tends to infinity. This work is beneficial to strengthen the understanding of vectorial properties of the FPGB diffracted by a circular aperture. (C) 2010 Elsevier B V All rights reserved
文献类型: Article
作者关键词: Four-petal Gaussian beam; Vectorial structure; Circular aperture; Far field
KeyWords Plus: PROPAGATION; PATTERNS; CRYSTAL; SYSTEMS
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 674AF
ISSN: 0030-4018
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第 14 条,共 159 条
标题: Total-internal-reflection fluorescence microscopy with W-shaped axicon mirrors
作者: Lei, M (Lei, Ming); Zumbusch, A (Zumbusch, Andreas)
来源出版物: OPTICS LETTERS  卷: 35  期: 23  页: 4057-4059  DOI: 10.1364/OL.35.004057  出版年: DEC 1 2010 
Web of Science 核心合集中的 "被引频次": 1
被引频次合计: 1
摘要: A scheme based on a W-shaped axicon mirror device for total-internal-reflection fluorescence microscopy (TIRFM) is presented. This approach combines the advantages of higher efficiency compared with traditional TIRFM, adjustable illumination area, and simple switching between wide-field and TIRF imaging modes. TIRF images obtained with this approach are free of shadow artifacts and of interference fringes. Example micrographs of fluorescently labeled polystyrene beads, of Convallaria majalis tissue, and of Propidium-iodide-labeled Chinese hamster ovary cells are shown, and the capabilities of the scheme are discussed. (C) 2010 Optical Society of America
PubMed ID: 21124611
文献类型: Article
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 688EI
ISSN: 0146-9592
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第 15 条,共 159 条
标题: Local histogram based geometric invariant image watermarking
作者: Deng, C (Deng, Cheng); Gao, XB (Gao, Xinbo); Li, XL (Li, Xuelong); Tao, DC (Tao, Dacheng)
来源出版物: SIGNAL PROCESSING  卷: 90  期: 12  页: 3256-3264  DOI: 10.1016/j.sigpro.2010.05.032  出版年: DEC 2010 
Web of Science 核心合集中的 "被引频次": 24
被引频次合计: 25
摘要: Compared with other existing methods, the feature point-based image watermarking schemes can resist to global geometric attacks and local geometric attacks, especially cropping and random bending attacks (RBAs), by binding watermark synchronization with salient image characteristics. However, the watermark detection rate remains low in the current feature point-based watermarking schemes. The main reason is that both of feature point extraction and watermark embedding are more or less related to the pixel position, which is seriously distorted by the interpolation error and the shift problem during geometric attacks. In view of these facts, this paper proposes a geometrically robust image watermarking scheme based on local histogram. Our scheme mainly consists of three components: (1) feature points extraction and local circular regions (LCRs) construction are conducted by using Harris-Laplace detector; (2) a mechanism of grapy theoretical clustering-based feature selection is used to choose a set of non-overlapped LCRs, then geometrically invariant LCRs are completely formed through dominant orientation normalization; and (3) the histogram and mean statistically independent of the pixel position are calculated over the selected LCRs and utilized to embed watermarks. Experimental results demonstrate that the proposed scheme can provide sufficient robustness against geometric attacks as well as common image processing operations. (C) 2010 Elsevier B.V. All rights reserved.
文献类型: Article
作者关键词: Image watermarking; Scale space; Feature detector; Local regions; Histogram modification; Geometric attacks
KeyWords Plus: SCALE-SPACE REPRESENTATION; TCHEBICHEF MOMENTS; FREQUENCY-DOMAIN; FEATURE POINTS; JPEG IMAGE; RETRIEVAL; ENCRYPTION
Web of Science 类别: Engineering, Electrical & Electronic
研究方向: Engineering
IDS 号: 639PF
ISSN: 0165-1684
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第 16 条,共 159 条
标题: Study on Spectral Broadened Characterization of Cross Phase Modulation in Photonic Crystal Fiber
作者: Hui, ZQ (Hui Zhan-qiang); Zhang, JG (Zhang Jian-guo)
来源出版物: SPECTROSCOPY AND SPECTRAL ANALYSIS  卷: 30  期: 12  页: 3295-3301  DOI: 10.3964/j.issn.1000-0593(2010)12-3295-07  出版年: DEC 2010 
Web of Science 核心合集中的 "被引频次": 0
被引频次合计: 1
摘要: Spectrum broadening induced by cross phase modulation (XPM) was investigated by exploiting the optical time-division multiplexing (OTDM) data signal and continue wave probe light co-propagation in dispersion flattened high nonlinear photonic crystal fiber (PCF). The effects of wavelength drift of probe lights, polarization mismatch, total power and power ration of pump and probe light on the spectrum broadening were analyzed. The results show that good XPM effects can be obtained in 36 nm wavelength range when the total power is higher than 23 dB, power ration of pump and probe light is appropriate and with identical polarization. Furthermore, polarization independent XPM effect can be achieved by using the remainder birefringence of the PCF with the pump state of polarization (SOP) aligned at 45 degrees to the PCF principal axes. The obtained results in this paper would be helpful for research on ultrahigh-speed all optical signal processing devices exploiting the XPM in PCF for future photonics network
文献类型: Article
作者关键词: Photonic crystal fiber (PCF); Cross phase modulation; Optical spectrum
KeyWords Plus: DISPERSION-SHIFTED FIBER; HIGHLY NONLINEAR FIBER; WAVELENGTH CONVERSION; OPTICAL-FIBERS; BIREFRINGENT FIBERS; LOOP MIRROR; PULSES; GENERATION; SILICA; TRAIN
Web of Science 类别: Spectroscopy
研究方向: Spectroscopy
IDS 号: 690FJ
ISSN: 1000-0593
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第 17 条,共 159 条
标题: Nanosize structural modifications with polarization functions in ultrafast laser irradiated bulk fused silica
作者: Mishchik, K (Mishchik, K.); Cheng, G (Cheng, G.); Huo, G (Huo, G.); Burakov, IM (Burakov, I. M.); Mauclair, C (Mauclair, C.); Mermillod-Blondin, A (Mermillod-Blondin, A.); Rosenfeld, A (Rosenfeld, A.); Ouerdane, Y (Ouerdane, Y.); Boukenter, A (Boukenter, A.); Parriaux, O (Parriaux, O.); Stoian, R (Stoian, R.)
来源出版物: OPTICS EXPRESS  卷: 18  期: 24  页: 24809-24824  DOI: 10.1364/OE.18.024809  出版年: NOV 22 2010 
Web of Science 核心合集中的 "被引频次": 19
被引频次合计: 22
摘要: Laser-induced self-organization of regular nanoscale layered patterns in fused silica is investigated using spectroscopy and microscopy methods, revealing a high presence of stable broken oxygen bonds. Longitudinal traces are then generated by replicating static irradiation structures where the nanoscale modulation can cover partially or completely the photoinscribed traces. The resulting birefringence, the observed anisotropic light scattering properties, and the capacity to write and erase modulated patterns can be used in designing bulk polarization sensitive devices. Various laser-induced structures with optical properties combining guiding, scattering, and polarization sensitivity are reported. The attached polarization functions were evaluated as a function of the fill factor of the nanostructured domains. The polarization sensitivity allows particular light propagation and confinement properties in three dimensional structures. (C) 2010 Optical Society of America
PubMed ID: 21164827
文献类型: Article
KeyWords Plus: ORGANIZED PLANAR NANOCRACKS; OPTICAL WAVE-GUIDES; FEMTOSECOND-LASER; FORM BIREFRINGENCE; DEFECT FORMATION; GLASS; PULSES; NANOGRATINGS; PLATES; SIO2
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 698IF
ISSN: 1094-4087
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第 18 条,共 159 条
标题: Efficient green-light generation by frequency doubling of a picosecond all-fiber ytterbium-doped fiber amplifier in PPKTP waveguide inscribed by femtosecond laser direct writing
作者: Tu, CH (Tu, Chenghou); Huang, ZC (Huang, Zhangchao); Lou, K (Lou, Kai); Liu, HJ (Liu, Hongjun); Wang, YS (Wang, Yishan); Li, YN (Li, Yongnan); Lu, FY (Lu, Fuyun); Wang, HT (Wang, Hui-Tian)
来源出版物: OPTICS EXPRESS  卷: 18  期: 24  页: 25183-25191  DOI: 10.1364/OE.18.025183  出版年: NOV 22 2010 
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 demonstrated an ultrashort, compact green light radiation by frequency doubling of an all-fiber ytterbium-doped fiber laser source in a PPKTP waveguide fabricated by femtosecond laser pulses. Using the fabricated PPKTP waveguide crystal containing a 10 mm single grating with a period of 9.0 mu m, we generate 310 mW of picosecond radiation at 532 nm for a fundamental power of 1.6W, corresponding to a conversion efficiency of 19.3%. The temperature tuning range of 8 degrees C is achieved for a fixed fundamental wavelength of 1064 nm, the FWHM of the wavelength tuning curve is 4.2 nm at room temperature. The generated ultrashort pulses at 532 nm are of great importance and have comprehensive applications in photobiology research and high-resolution spectroscopy. (C) 2010 Optical Society of America
PubMed ID: 21164865
文献类型: Article
KeyWords Plus: POTASSIUM TITANYL PHOSPHATE; PERIODICALLY POLED KTP; 2ND-HARMONIC GENERATION; BLUE-LIGHT; HIGH-POWER; PULSES; DIODE; NM; OSCILLATOR; MICROSCOPY
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 698IF
ISSN: 1094-4087
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第 19 条,共 159 条
标题: Mechanism of high-energy pulse generation without wave breaking in mode-locked fiber lasers
作者: Liu, XM (Liu, Xueming)
来源出版物: PHYSICAL REVIEW A  卷: 82  期: 5  文献号: 053808  DOI: 10.1103/PhysRevA.82.053808  出版年: NOV 10 2010 
Web of Science 核心合集中的 "被引频次": 46
被引频次合计: 46
摘要: The mechanism and intrinsic conditions of high-energy wave-breaking-free pulse generation in fiber lasers mode-locked by a nonlinear polarization rotation technique are investigated numerically and experimentally. Both numerical and experimental results show that the pulses along the two orthogonal polarization axes of the fiber have a large difference in pulse energy. The numerical simulations show that the ratio of the energy of two components is limited and ranges from about 8 to about 65. The slope of the instantaneous frequency at the central position of the pulse decreases rapidly with the increase of the pulse duration and energy, whereas the slope at the pulse edge changes slightly. The accumulation of instantaneous frequency throughout the pulse width approaches a constant in a higher pulse energy regime. Understanding the mechanism and intrinsic conditions of the wave-breaking-free pulse generation could be useful in generating high-energy pulses delivered from fiber lasers.
文献类型: Article
KeyWords Plus: NORMAL-DISPERSION; DISSIPATIVE SOLITONS; DOPED FIBER; RING LASER; PROPAGATION
Web of Science 类别: Optics; Physics, Atomic, Molecular & Chemical
研究方向: Optics; Physics
IDS 号: 678BV
ISSN: 1050-2947
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第 20 条,共 159 条
标题: An integrated aurora image retrieval system: AuroraEye
作者: Fu, R (Fu, Rong); Gao, XB (Gao, Xinbo); Li, XL (Li, Xuelong); Tao, DC (Tao, Dacheng); Jian, YJ (Jian, Yongjun); Li, J (Li, Jie); Hu, HQ (Hu, Hongqiao); Yang, HG (Yang, Huigen)
来源出版物: JOURNAL OF VISUAL COMMUNICATION AND IMAGE REPRESENTATION  卷: 21  期: 8  页: 787-797  DOI: 10.1016/j.jvcir.2010.06.002  出版年: NOV 2010 
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 digital all-sky imager (ASI) emergence in aurora research, millions of images are captured annually. However, only a fraction of which can be actually used. To address the problem incurred by low efficient manual processing, an integrated image analysis and retrieval system is developed. For precisely representing aurora image, macroscopic and microscopic features are combined to describe aurora texture. To reduce the feature dimensionality of the huge dataset, a modified local binary pattern (LBP) called ALBP is proposed to depict the microscopic texture, and scale-invariant Gabor and orientation-invariant Gabor are employed to extract the macroscopic texture. A physical property of aurora is inducted as region features to bridge the gap between the low-level visual features and high-level semantic description. The experiments results demonstrate that the ALBP method achieves high classification rate and low computational complexity. The retrieval simulation results show that the developed retrieval system is efficient for huge dataset. (c) 2010 Elsevier Inc. All rights reserved.
文献类型: Article
作者关键词: Content-based image retrieval; Aurora; Adaptive LBP; Gabor; Image texture analysis; Database; Feature extraction; Local binary pattern
KeyWords Plus: SUPPORT VECTOR MACHINES; RELEVANCE FEEDBACK; SELECTION; SUBSPACE; TENSOR
Web of Science 类别: Computer Science, Information Systems; Computer Science, Software Engineering
研究方向: Computer Science
IDS 号: 675JV
ISSN: 1047-3203
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第 21 条,共 159 条
标题: High birefringent rhombic-hole photonic crystal fibers
作者: Hu, B (Hu, Bin); Lu, M (Lu, Min); Li, WN (Li, Weinan); Zou, KS (Zou, Kuaisheng); Zhou, ZG (Zhou, Zhiguang); Lin, AX (Lin, Aoxiang); Li, N (Li, Ning)
来源出版物: APPLIED OPTICS  卷: 49  期: 31  页: 6098-6101  DOI: 10.1364/AO.49.006098  出版年: NOV 1 2010 
Web of Science 核心合集中的 "被引频次": 7
被引频次合计: 7
摘要: High birefringence induced by rhombic air-hole photonic crystal fibers (PCFs) is numerically analyzed by using the finite-element method. The birefringence of a few kinds of PCFs was investigated with different parameters related to rhombic holes, including the rhombic-hole shape, size, and spacing. It was found that the birefringence of the proposed rhombic-hole PCF in this study is relatively larger than that of an elliptical-hole PCF with the same air-filling fraction (f = 0.0375) when the ratio of the rhombic-hole diagonal length is equal to the elliptical-hole ellipticity. (C) 2010 Optical Society of America
文献类型: Article
KeyWords Plus: MODE HOLEY; POLARIZATION; LATTICE; DESIGN; DISPERSION; UNIT
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 673IN
ISSN: 1559-128X
电子 ISSN: 2155-3165
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第 22 条,共 159 条
标题: Second-harmonic generation from a periodic array of noncentrosymmetric nanoholes
作者: Zhou, RL (Zhou, Renlong); Lu, H (Lu, Hua); Liu, XM (Liu, Xueming); Gong, YK (Gong, Yongkang); Mao, D (Mao, Dong)
来源出版物: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS  卷: 27  期: 11  页: 2405-2409  出版年: NOV 2010 
Web of Science 核心合集中的 "被引频次": 7
被引频次合计: 7
摘要: Second-harmonic generation (SHG) through a proposed thin gold film with a periodic array of subwavelength nanoholes is numerically investigated. By using a recently developed microscopic classical theory and a full-vectorial three-dimensional finite-difference time-domain method, we demonstrate that the mirror symmetry of nanoholes in one direction restricts the polarization state of second-harmonic emission in the same direction. Numerical results show that the second-order nonlinear susceptibility chi((2))(yyy) dominates in the process of SHG when the nanoholes possess mirror symmetry in the x-axis direction. It is also found that the surface plasmon resonance can result in the enhancement of SHG from metallic nanoholes. (C) 2010 Optical Society of America
文献类型: Article
KeyWords Plus: 3RD-HARMONIC GENERATION; METAL-SURFACE; FILMS; NANOPARTICLES; TRANSMISSION; MICROSCOPY; LIGHT; HOLES
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 674VS
ISSN: 0740-3224
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第 23 条,共 159 条
标题: Tb3+/Yb3+ heavily-doped tellurite glasses with efficient green light emission
作者: Zhou, ZG (Zhou, Zhiguang); Lin, AX (Lin, Aoxiang); Guo, HT (Guo, Haitao); Liu, XM (Liu, Xueming); Hou, CQ (Hou, Chaoqi); Lu, M (Lu, Min); Wei, W (Wei, Wei); Peng, B (Peng, Bo); Zhao, W (Zhao, Wei); Toulouse, J (Toulouse, Jean)
来源出版物: JOURNAL OF NON-CRYSTALLINE SOLIDS  卷: 356  期: 50-51  页: 2896-2899  DOI: 10.1016/j.jnoncrysol.2010.09.010  出版年: NOV 2010 
Web of Science 核心合集中的 "被引频次": 6
被引频次合计: 6
摘要: Without introducing concentration quenching phenomenon a few wt % of Tb3+ and Yb3+ ions were doped into a group of easily-fiberized tellunte glasses characterized by loose polyhedron structures and rich interstitial positions Intense green upconversion emission from Tb3+ ions centered at 539 nm due to transition D-5(4) -> F-7(5) was observed by direct excitation of Yb3+ ions with a laser diode at 976 nm Optimizing the concentration ratio of Tb3+/Yb3+ a tellunte glass with a composition of 80TeO(2)-10ZnO-10Na(2)O (mol%) + 1 0 wt % Tb2O3 + 3 0 wt % Yb2O3 was found to present the highest green light intensity and therefore is especially suitable for efficient green fiber laser development (C) 2010 Elsevier BV All rights reserved
文献类型: Article
作者关键词: Tellurites; Laser upconversion; Visible lasers; Fiber materials
KeyWords Plus: COOPERATIVE ENERGY-TRANSFER; SILICATE OPTICAL-FIBER; UP-CONVERSION; SPECTROSCOPIC PROPERTIES; LASER; NONLINEARITY; YTTERBIUM; TB3+
Web of Science 类别: Materials Science, Ceramics; Materials Science, Multidisciplinary
研究方向: Materials Science
IDS 号: 699JX
ISSN: 0022-3093
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第 24 条,共 159 条
标题: Spacing-tunable multi-wavelength fiber laser based on cascaded four-wave mixing in highly nonlinear photonic-crystal fiber
作者: Sun, HB (Sun, H. B.); Liu, XM (Liu, X. M.); Wang, LR (Wang, L. R.); Li, XH (Li, X. H.); Mao, D (Mao, D.)
来源出版物: LASER PHYSICS  卷: 20  期: 11  页: 1994-2000  DOI: 10.1134/S1054660X10210115  出版年: NOV 2010 
Web of Science 核心合集中的 "被引频次": 15
被引频次合计: 15
摘要: A multi-wavelength fiber laser based on the cascaded four-wave mixing in highly-nonlinear photonic-crystal fiber is proposed and investigated. The cascade operation is initiated by two strong pump waves boosted by multi-mode pumping erbium/ytterbium co-doped double-cladding fiber amplification technique. A segment of highly-nonlinear near-zero-dispersion-flattened photonic crystal fiber is employed to induce highly efficient cascaded four-wave mixing. The wavelength spacing can be continuously tunable by stretching the fiber Bragg grating. Experimental results show that multiple wavelengths with a high optical side-mode suppression-ratio of > 30 dB are achieved. Furthermore, the proposed multi-wavelength fiber laser exhibits an excellent stability at room temperature.
文献类型: Article
KeyWords Plus: ERBIUM-DOPED FIBER; BRAGG GRATINGS; BROAD; GENERATION
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 679DX
ISSN: 1054-660X
________________________________________
第 25 条,共 159 条
标题: Primary scientific results of Chang'E-1 lunar mission
作者: Ouyang, ZY (Ouyang ZiYuan); Li, CL (Li ChunLai); Zou, YL (Zou YongLiao); Zhang, HB (Zhang HongBo); Lu, C (Lue Chang); Liu, JZ (Liu JianZhong); Liu, JJ (Liu JianJun); Zuo, W (Zuo Wei); Su, Y (Su Yan); Wen, WB (Wen WeiBin); Bian, W (Bian Wei); Zhao, BC (Zhao BaoChang); Wang, JY (Wang JianYu); Yang, JF (Yang JianFeng); Chang, J (Chang Jin); Wang, HY (Wang HuanYu); Zhang, XH (Zhang XiaoHui); Wang, SJ (Wang ShiJin); Wang, M (Wang Min); Ren, X (Ren Xin); Mu, LL (Mu LingLi); Kong, DQ (Kong DeQing); Wang, XQ (Wang XiaoQian); Wang, F (Wang Fang); Geng, LA (Geng Liang); Zhang, ZB (Zhang ZhouBin); Zheng, L (Zheng Lei); Zhu, XY (Zhu XinYing); Zheng, YC (Zheng YongChun); Li, JD (Li JunDuo); Zou, XD (Zou XiaoDuan); Xu, C (Xu Chun); Shi, SB (Shi ShuoBiao); Gao, YF (Gao YiFei); Gao, GN (Gao GuanNan)
来源出版物: SCIENCE CHINA-EARTH SCIENCES  卷: 53  期: 11  页: 1565-1581  DOI: 10.1007/s11430-010-4056-2  出版年: NOV 2010 
Web of Science 核心合集中的 "被引频次": 16
被引频次合计: 18
摘要: The strategic plan for the development of the unmanned Chinese Lunar Exploration Program is characterized by three distinct stages: "orbiting around", "landing on" and "returning from" the Moon. The first Chinese lunar probe, Chang'E-1, which was successfully launched on October 24th, 2007 at Xichang Satellite Launch Center, and guided to crash on the Moon on March 1st, 2009, at 52.36A degrees E, 1.50A degrees S, in the north of Mare Fecunditatis, is the first step towards the "orbiting around" stage. The Chang'E-1 mission lasted 495 days, exceeding the expected life-span by about four months. A total of 1.37 TB raw data was received from Chang'E-1. It was then processed into 4 TB scientific data products at various levels. Many scientific results have been obtained by analyzing these data, including especially the "global lunar image from the first Chinese lunar exploration mission". All scientific goals of Chang'E-1 have been achieved. It provides much useful materials for further advances of lunar sciences and planetary chemistry. Meanwhile, these results will serve as a firm basis for future Chinese lunar missions.
文献类型: Review
作者关键词: lunar orbiter; Chang'E-1; scientific data; results
KeyWords Plus: SOIL SIMULANT
Web of Science 类别: Geosciences, Multidisciplinary
研究方向: Geology
IDS 号: 679NJ
ISSN: 1674-7313
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第 26 条,共 159 条
标题: Generation and amplification of high-energy nanosecond pulses in a compact all-fiber laser
作者: Mao, D (Mao, Dong); Liu, XM (Liu, Xueming); Wang, LR (Wang, Leiran); Lu, H (Lu, Hua); Feng, HA (Feng, Huan)
来源出版物: OPTICS EXPRESS  卷: 18  期: 22  页: 23024-23029  DOI: 10.1364/OE.18.023024  出版年: OCT 25 2010 
Web of Science 核心合集中的 "被引频次": 25
被引频次合计: 25
摘要: We have experimentally investigated high-energy rectangular pulses delivering from an erbium-doped fiber laser operating in ultra-large net-negative-dispersion regime. The laser oscillator emits rectangular pulses with approximately Gaussian spectral profiles, adjustable nanoseconds durations, and multi-ten nanojoule energies. The outputted pulses can be further amplified to over 2 mu J without distortion by a two-stage erbium-doped fiber amplifier. Thus, rectangular pulses with controllable durations and energies can be achieved from the compact all-fiber fiber laser system. (C) 2010 Optical Society of America
PubMed ID: 21164642
文献类型: Article
KeyWords Plus: LOW REPETITION RATE; NORMAL-DISPERSION; DOPED FIBER; DISSIPATIVE SOLITONS; WAVE-BREAKING; MODE-LOCKING; NJ
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 672CK
ISSN: 1094-4087
________________________________________
第 27 条,共 159 条
标题: Third-order nonlinear optical properties of GeS2-Sb2S3-CdS chalcogenide glasses
作者: Guo, HT (Guo, Haitao); Hou, CQ (Hou, Chaoqi); Gao, F (Gao, Fei); Lin, AX (Lin, Aoxiang); Wang, PF (Wang, Pengfei); Zhou, ZG (Zhou, Zhiguang); Lu, M (Lu, Min); Wei, W (Wei, Wei); Peng, B (Peng, Bo)
来源出版物: OPTICS EXPRESS  卷: 18  期: 22  页: 23275-23284  DOI: 10.1364/OE.18.023275  出版年: OCT 25 2010 
Web of Science 核心合集中的 "被引频次": 11
被引频次合计: 11
摘要: The third-order nonlinear optical properties of GeS2-Sb2S3-CdS chalcogenide glasses were investigated utilizing the Z-scan and femtosecond time-resolved optical Kerr effect (OKE) methods at the wavelength of 800nm, respectively. The compositional dependences were analyzed and the influencing factors including the linear refractive index, the concentration of lone electron pairs, the optical bandgap and the amount of weak covalent/ homopolar bonds were discussed. A glass, i.e. 76GeS(2)center dot 19Sb(2)S(3 center dot)5CdS, with large nonlinear refrative index (n(2) = 5.63 x 10(-14) cm(2)/W), low nonlinear absorption coefficient (beta = 0.88 cm/GW) and minimum figure of merit (FOM = 2 beta lambda/n(2) = 2.51) was finally prepared. The electronic contribution in weak heterpolar covalent and homopolar bonds are responsible for large n(2) in chalcogenide glass, and the Sheik-Bahae rule combining the Moss rule are proved to be an effective guidance for estimating the third-order nonlinearities and further optimizing the compositions in chalcogenide glasses. (C) 2010 Optical Society of America
PubMed ID: 21164668
文献类型: Article
KeyWords Plus: AS-S-SE; SYSTEM; FIBERS
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 672CK
ISSN: 1094-4087
________________________________________
第 28 条,共 159 条
标题: Simulation and optimization of spatial light modulation of twisted-nematic liquid crystal display
作者: Ma, BH (Ma, Baiheng); Yao, BL (Yao, Baoli); Yan, SH (Yan, Shaohui); Peng, F (Peng, Fei); Min, JW (Min, Junwei); Lei, M (Lei, Ming); Ye, T (Ye, Tong)
来源出版物: CHINESE OPTICS LETTERS  卷: 8  期: 10  特刊: SI  页: 960-963  DOI: 10.3788/COL20100810.0960  出版年: OCT 10 2010 
Web of Science 核心合集中的 "被引频次": 2
被引频次合计: 2
摘要: The approaches to obtaining desired intensity or phase modulation by twisted-nematic liquid crystal display (TN-LCD) have been extensively studied based on the knowledge of the LCD's internal structure parameters. Generally, the TN-LCD placed between two linear polarizers (P) produces coupled intensity and phase modulation. To obtain the commonly used phase-only modulation, quarter wave plates (QWPs) are often used in front of and/or behind the LCD. Here we present a method to optimize the optical modulation properties of the TN-LCD to obtain phase-only modulation in the configuration of P-QWP-LCD-QWP-P each with proper orientation. Our method is based on the macroscopical Jones matrix descriptions for the LCD, the QWPs, and the linear polarizers. Through Jones matrix calculations, the orientations of the polarizers and QWPs can be optimized to satisfy differently desired modulation demands. In contrast to the traditional method, which requires knowledge of the LCD's internal structure parameters, our method simplified the complicated theory analysis and can work in the absence of information on the LCD's internal structure parameters, which are usually not available for the commercial products.
文献类型: Article
KeyWords Plus: PHASE-ONLY MODULATION; TELEVISION; STATES; TV
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 663XK
ISSN: 1671-7694
________________________________________
第 29 条,共 159 条
标题: Improved digital processing method used for image motion measurement based on hybrid opto-digital joint transform correlator
作者: Yi, HW (Yi, Hongwei); Zhao, H (Zhao, Hui); Li, YC (Li, Yingcai); Wen, DS (Wen, Desheng)
来源出版物: CHINESE OPTICS LETTERS  卷: 8  期: 10  特刊: SI  页: 989-992  DOI: 10.3788/COL20100810.0989  出版年: OCT 10 2010 
Web of Science 核心合集中的 "被引频次": 2
被引频次合计: 2
摘要: Hybrid opto-digital joint transform correlator (HODJTC) is effective for image motion measurement, but it is different from the traditional joint transform correlator because it only has one optical transform and the joint power spectrum is directly input into a digital processing unit to compute the image shift. The local cross-correlation image can be directly obtained by adopting a local Fourier transform operator. After the pixel-level location of cross-correlation peak is initially obtained, the up-sampling technique is introduced to relocate the peak in even higher accuracy. With signal-to-noise ratio >= 20 dB, up-sampling factor k >= 10 and the maximum image shift <= 60 pixels, the root-mean-square error of motion measurement accuracy can be controlled below 0.05 pixels.
文献类型: Article
KeyWords Plus: TARGET RECOGNITION; JTC
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 663XK
ISSN: 1671-7694
________________________________________
第 30 条,共 159 条
标题: Properties of photon counting imaging system with Si thin films
作者: Zhao, FF (Zhao Fei-Fei); Liu, YA (Liu Yong-An); Hu, HJ (Hu Hui-Jun); Zhao, BS (Zhao Bao-Sheng)
来源出版物: ACTA PHYSICA SINICA  卷: 59  期: 10  页: 7096-7104  出版年: OCT 2010 
Web of Science 核心合集中的 "被引频次": 1
被引频次合计: 1
摘要: The Si thin films on ceramic substrates,which were fabricated by electron beam evaporation, were applied as charge induction layers in photon counting imaging system with induction readout. The structures and micrograph of Si thin films were studied. The X-ray diffraction (XRD) analysis and field emission scanning electron microscopy (FESEM) images indicate that the thin film has amorphous structure and is coarse due to the lattice boundary of ceramic substrate. The experimental setup was established and the detector resolution, counting rate, pulse height distribution curves etc., with different Si film thickness were compared. The results suggest that the film thickness influences on spatial resolution less than on the counting rate. Moreover, the properties of the system with Si and Ge thin films of the same resistance were compared,which shows that the properties such as distortion,counting rate and dark count rate are better with the Si films.
文献类型: Article
作者关键词: detectors; photon counting imaging; charge induction; microchannel plate
KeyWords Plus: DETECTOR
Web of Science 类别: Physics, Multidisciplinary
研究方向: Physics
IDS 号: 670FK
ISSN: 1000-3290
________________________________________
第 31 条,共 159 条
标题: Optical Trapping of Double-Ring Radially Polarized Beam with Improved Axial Trapping Efficiency
作者: Yao, BL (Yao Bao-Li); Yan, SH (Yan Shao-Hui); Ye, T (Ye Tong); Zhao, W (Zhao Wei)
来源出版物: CHINESE PHYSICS LETTERS  卷: 27  期: 10  文献号: 108701  DOI: 10.1088/0256-307X/27/10/108701  出版年: OCT 2010 
Web of Science 核心合集中的 "被引频次": 3
被引频次合计: 4
摘要: Radially polarized beams, focused by a high numerical aperture (NA) objective, have non-propagating fields along the propagation axis in the focal region, which leads to a higher axial trapping efficiency in comparison with linearly polarized beams. We propose a design for converting a lowest-order radially polarized beam (R-TEM(01)) to a double-ring radial polarization distribution (DR R-TEM(01)) through a specially designed polarization rotator. The phases of the two rings of this beam differ by pi. Numerical results evaluated by rigorous T-matrix method show that the DR R-TEM(01) beam can improve the axial trapping efficiency compared with the R-TEM(01) beam, provided that the size of trapped particles is of order of the wavelength of the beam.
文献类型: Article
KeyWords Plus: DIELECTRIC SPHERE; VECTOR BEAMS; LASER-BEAM; PARTICLES; FORCES; REGIME
Web of Science 类别: Physics, Multidisciplinary
研究方向: Physics
IDS 号: 663GE
ISSN: 0256-307X
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第 32 条,共 159 条
标题: Linear and nonlinear optical properties of the PbSe quantum dots doped germano-silica glass optical fiber
作者: Watekar, PR (Watekar, Pramod R.); Ju, S (Ju, Seongmin); Lin, AX (Lin, Aoxiang); Kim, MJ (Kim, Myoung Jin); Lee, BH (Lee, Byeong Ha); Han, WT (Han, Won-Taek)
来源出版物: JOURNAL OF NON-CRYSTALLINE SOLIDS  卷: 356  期: 44-49  特刊: SI  页: 2384-2388  DOI: 10.1016/j.jnoncrysol.2010.02.012  出版年: OCT 1 2010 
Web of Science 核心合集中的 "被引频次": 5
被引频次合计: 6
摘要: We report development of a new fiber doped with PbSe quantum dots for nonlinear optical applications. PbSe quantum dots related absorption peaks were obtained at 1021, 1093 and 1351 nm. The resonant optical nonlinearity and attenuation at 1500 nm were measured to be 9.4 x 10(-16) m(2)/W and 0.01 dB/m, respectively. The emission around 1540 nm was observed upon near resonant pumping at 1064 nm. (C) 2010 Elsevier B.V. All rights reserved.
文献类型: Article; Proceedings Paper
会议名称: 12th International Conference on the Physics of Non-Crystalline Solids (PNCS12)
会议日期: SEP 06-09, 2009
会议地点: Foz do Iguacu, BRAZIL
作者关键词: Optical fiber; Quantum dots
Web of Science 类别: Materials Science, Ceramics; Materials Science, Multidisciplinary
研究方向: Materials Science
IDS 号: 694GD
ISSN: 0022-3093
________________________________________
第 33 条,共 159 条
标题: The near- and mid-infrared emission properties of Tm3+-doped GeGaS-CsI chalcogenide glasses
作者: Dai, SX (Dai Shixun); Peng, B (Peng Bo); Zhang, PJ (Zhang Pengjun); Xu, TF (Xu Tiefeng); Xunsi, W (Xunsi Wang); Nie, QH (Nie Qiuhua); Zhang, XH (Zhang Xianghua)
来源出版物: JOURNAL OF NON-CRYSTALLINE SOLIDS  卷: 356  期: 44-49  特刊: SI  页: 2424-2428  DOI: 10.1016/j.jnoncrysol.2010.03.020  出版年: OCT 1 2010 
Web of Science 核心合集中的 "被引频次": 5
被引频次合计: 8
摘要: Serials of chalcogenide glasses based on composition of 72GeS(2)-18Ga(2)S(3)-10CsI (in mol%) and doped with high Tm3+ content (up to 10,000 ppm) were prepared, and their luminescence properties were investigated under excitation with 800 nm laser. The influences of doping concentration on Judd-Ofelt intensity parameter Omega(i) spontaneous transition probability A, fluorescence branching ratio beta, and radiative lifetime tau(rad) of Tm3+ in the samples were studied. Four infrared emission bands observed were centered at 1.48, 1.8, 2.3, and 3.8 mu m, corresponding to optical transitions H-3(4) -> F-3(4), F-3(4) -> H-3(6), H-3(4) -> H-3(5) and H-3(5) -> F-3(4), respectively. For 1.0 wt.% Tm3+: doped sample, no concentration quenching was observed and its emission cross-sections at 2.3 and 3.8 mu m calculated by using Fuchtbauer-Ladenburg equation were 6.85 x 10(-21) and 7.66 x 10(-21) cm(-2), respectively. (C) 2010 Elsevier B.V. All rights reserved.
文献类型: Article; Proceedings Paper
会议名称: 12th International Conference on the Physics of Non-Crystalline Solids (PNCS12)
会议日期: SEP 06-09, 2009
会议地点: Foz do Iguacu, BRAZIL
作者关键词: Rare earth ions; Thulium ions; Chalcogenide glasses; Mid-infrared
KeyWords Plus: LANTHANUM SULFIDE GLASS; RARE-EARTH IONS; GA-S GLASSES; OPTICAL-PROPERTIES; MU-M; TM3+; SPECTROSCOPY; INTENSITIES
Web of Science 类别: Materials Science, Ceramics; Materials Science, Multidisciplinary
研究方向: Materials Science
IDS 号: 694GD
ISSN: 0022-3093
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第 34 条,共 159 条
标题: Detection efficiency for an ultraviolet photon counting imaging system based on the Ge induction readout
作者: Zhang, XH (Zhang, Xinghua); Zhao, BZ (Zhao, Baosheng); Liu, YA (Liu, Yong'an); Zhao, FF (Zhao, Feifei); Yan, QR (Yan, Qiurong)
来源出版物: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT  卷: 622  期: 1  页: 311-315  DOI: 10.1016/j.nima.2010.03.140  出版年: OCT 1 2010 
Web of Science 核心合集中的 "被引频次": 1
被引频次合计: 1
摘要: The detection efficiency, assumed proportional to the count rate, of an ultraviolet photon counting imaging system based on the Ge induction readout is studied. For the Ge induction readout, the system count rate with different Ge layer resistances, Ge layer thicknesses and ceramic thicknesses are tested under different light intensities. The test results show that the system count rate with a high resistance in the Ge layer is lower than that with a low resistance in the Ge layer; further, the imaging area decreases as the Ge layer resistance increases under high photon flux. Moreover the system count rate with a thick Ge layer is lower than that with a thin Ge layer. In addition, the system count rate with 2-mm ceramic is higher than that with 1.5- and 3-mm ceramic. The above observation should be considered when designing an ultraviolet photon counting imaging detector based on the Ge induction readout. (C) 2010 Elsevier B.V. All rights reserved.
文献类型: Article
作者关键词: Photon counting imaging; Induction readout; Wedge and strip anode; Count rate
KeyWords Plus: POSITION; MICROSCOPE; MISSION; ANODES
Web of Science 类别: Instruments & Instrumentation; Nuclear Science & Technology; Physics, Particles & Fields; Spectroscopy
研究方向: Instruments & Instrumentation; Nuclear Science & Technology; Physics; Spectroscopy
IDS 号: 658YC
ISSN: 0168-9002
________________________________________
第 35 条,共 159 条
标题: cavity passively mode-locked fiber ring laser with high-energy rectangular-shape pulses in anomalous dispersion regime
作者: Li, XH (Li, Xiaohui); Liu, XM (Liu, Xueming); Hu, XH (Hu, Xiaohong); Wang, LR (Wang, Leirang); Lu, H (Lu, Hua); Wang, YS (Wang, Yishan); Zhao, W (Zhao, Wei)
来源出版物: OPTICS LETTERS  卷: 35  期: 19  页: 3249-3251  出版年: OCT 1 2010 
Web of Science 核心合集中的 "被引频次": 49
被引频次合计: 50
摘要: We report on a long-cavity passively mode-locked fiber laser in the anomalous dispersion regime. The nonlinear polarization rotation technique is employed to achieve mode locking. The output pulse from the fiber laser has a rectangular shape and a corresponding Gaussian-shape spectral profile. Stable mode-locked pulses at a repetition rate of 278 kHz with single pulse energy as high as 715 nJ are obtained under equal bidirectional pumping power of 500 mW in cavity. The experimental results demonstrate that the passively mode-locked fiber laser operating in the anomalous regime can also realize a high-energy pulse, which is different from the conventional low-energy soliton pulse. (C) 2010 Optical Society of America
PubMed ID: 20890349
文献类型: Article
KeyWords Plus: REPETITION RATE
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 656XQ
ISSN: 0146-9592
________________________________________
第 36 条,共 159 条
标题: Carbon dioxide gas sensor derived from a 547-hole microstructured polymer optical fiber preform
作者: Wang, JA (Wang, Jian); Wang, LL (Wang, Lili)
来源出版物: OPTICS LETTERS  卷: 35  期: 19  页: 3270-3272  出版年: OCT 1 2010 
Web of Science 核心合集中的 "被引频次": 2
被引频次合计: 4
摘要: In this Letter, we report a carbon dioxide gas sensor having 547 pieces of thin-film modified capillaries, which are derived from a microstructured polymer optical fiber preform. Compared with the conventional absorption-based sensor, the monolithic polymer capillary waveguide arrays have better sensitivity, because the huge sensing surfaces, composed of 547 pieces of dye-indicator-doped porous ethyl cellulose layers, interact directly with the gas molecules. As far as we know, a gas sensor based on multichannel capillary waveguide arrays has not been reported before. (C) 2010 Optical Society of America
PubMed ID: 20890356
文献类型: Article
KeyWords Plus: ARRAY; FILM; PH
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 656XQ
ISSN: 0146-9592
________________________________________
第 37 条,共 159 条
标题: Research on Spectral Classification Algorithm Based on Spatial Feature
作者: Gao, XH (Gao Xiao-hui); Xiangli, B (Xiangli Bin); Wei, JX (Wei Jun-xia); Wei, RY (Wei Ru-yi); Yu, T (Yu Tao)
来源出版物: SPECTROSCOPY AND SPECTRAL ANALYSIS  卷: 30  期: 10  页: 2772-2775  DOI: 10.3964/j.issn.1000-0593(2010)10-2772-04  出版年: OCT 2010 
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 wide use of imaging spectroscopy, applying data cubes to classification and identification of materials has been developed to be an important research content. The classification algorithms play a vital role in accuracy and precision of object identification. The most common classification algorithms mainly make use of the information gained from spectral dimension and classify the materials based on spectral match. The material reflectance spectra collected by imaging spectroscopy is determined not only by the sorts, but also by the geometry structure and roughness of material surface, and so on. Then classification and identification algorithms only using the reflection spectra have errors to some extent. This paper puts forward an algorithm based on the common classification algorithms that controls the classification process by using the spatial feature of image to promote the correctness of classification. This algorithm was applied to identify the true leaves from the fake ones. The result shows preferable spatial continuity. To a great extent, the algorithm overcomes "ma pixel" domino effect, and is proved valid.
文献类型: Article
作者关键词: Object identification; Spectral detection; Spectral match; Spectral classification
Web of Science 类别: Spectroscopy
研究方向: Spectroscopy
IDS 号: 668KP
ISSN: 1000-0593
________________________________________
第 38 条,共 159 条
标题: Developments and Trends of the Computed Tomography Imaging Spectrometers
作者: Wei, RY (Wei Ru-yi); Zhou, JS (Zhou Jin-song); Jing, JJ (Jing Juan-juan); Wang, XQ (Wang Xin-quan); Gao, XH (Gao Xiao-hui); Wang, L (Wang Le)
来源出版物: SPECTROSCOPY AND SPECTRAL ANALYSIS  卷: 30  期: 10  页: 2866-2873  DOI: 10.3964/j.issn.1000-0593(2010)10-2866-08  出版年: OCT 2010 
Web of Science 核心合集中的 "被引频次": 0
被引频次合计: 0
摘要: The present paper reviews the computed tomography imaging spectrometer (CTIS) measurement systems at home and abroad from the aspects of technological characterizations and research focuses. The developments of computed tomography imaging spectrometers are described, involving the adding new abilities by improving systematic structure and by incorporating other elements or systems, the study and applications of novel grating elements, detectors or apparatus, the optimizations and improvements of the system calibration methods and reconstruction algorithms. In addition, based on the classification of application scope, the extension status of probing spectral bands and application fields towards computed tomography imaging spectrometers and related systems are summarized. The principles of non-scanning computed tomography imaging spectrometer and high-throughput computed tomography imaging spectrometer are introduced. Moreover, the trends of computed tomography imaging spectrometers are discussed too.
文献类型: Article
作者关键词: Imaging spectrometer; Computed tomography; Central slice theorem; Grating; Direct vision prism
KeyWords Plus: SPECTROPOLARIMETER CTISP; SIMULTANEOUS ACQUISITION; RESTORATION; DESIGN; IMAGER
Web of Science 类别: Spectroscopy
研究方向: Spectroscopy
IDS 号: 668KP
ISSN: 1000-0593
________________________________________
第 39 条,共 159 条
标题: Investigation of soliton pairs in an erbium-doped fiber laser with large normal dispersion
作者: Mao, D (Mao, D.); Liu, XM (Liu, X. M.); Wang, LR (Wang, L. R.); Lu, H (Lu, H.); Hu, XH (Hu, X. H.)
来源出版物: OPTICS COMMUNICATIONS  卷: 283  期: 18  页: 3492-3496  DOI: 10.1016/j.optcom.2010.04.107  出版年: SEP 15 2010 
Web of Science 核心合集中的 "被引频次": 6
被引频次合计: 7
摘要: We experimentally investigate the soliton pairs in a passively mode-locked erbium-doped fiber laser with large normal cavity dispersion. By adjusting the polarization state, four different kinds of soliton pairs are achieved. The pulses in soliton pairs exhibit different temporal separations, and show randomly distributed spikes on the top-flat of spectra. The pulse-pulse interactions in the soliton pairs are investigated, and it is suggested that the pulse separation, pulse duration, and their relative intensities all determine the strength of pulse interactions. (C) 2010 Elsevier B.V. All rights reserved.
文献类型: Article
作者关键词: Soliton pairs; Fiber laser; Pulse-pulse interactions
KeyWords Plus: DISSIPATIVE SOLITONS; MODE; PULSES
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 627PE
ISSN: 0030-4018
________________________________________
第 40 条,共 159 条
标题: Nonlinear chirped-pulse propagation and supercontinuum generation in photonic crystal fibers
作者: Hu, XH (Hu, Xiaohong); Wang, YS (Wang, Yishan); Zhao, W (Zhao, Wei); Yang, Z (Yang, Zhi); Zhang, W (Zhang, Wei); Li, C (Li, Cheng); Wang, HS (Wang, Hushan)
来源出版物: APPLIED OPTICS  卷: 49  期: 26  页: 4984-4989  DOI: 10.1364/AO.49.004984  出版年: SEP 10 2010 
Web of Science 核心合集中的 "被引频次": 10
被引频次合计: 10
摘要: Based on the generalized nonlinear Schrodinger equation and waveguiding properties typical of the photonic crystal fiber structure, nonlinear chirped-pulse propagation and supercontinua generation in the femtosecond and picosecond regimes are investigated numerically. The simulation results indicate that an input chirp parameter mainly affects the initial stage of spectral broadening caused by the self-phase modulation (SPM) effect. In the femtosecond regime where the SPM effect plays an important role in the process of spectral broadening, an input positive chirp can enhance the supercontinuum bandwidth through a modified pulse compression phase and a decreased propagation distance required by soliton fission. In the picosecond regime, where the SPM effect contributes less to the continuum bandwidth and four-wave mixing process or modulational instability dominates the initial stage of spectral and temporal evolution, the output spectral shape and bandwidths are less sensitive to the input chirp parameters. (C) 2010 Optical Society of America
PubMed ID: 20830188
文献类型: Article
KeyWords Plus: STIMULATED RAMAN-SCATTERING; OPTICAL-FIBERS; CONTINUUM GENERATION; DISPERSION; LASERS
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 648PN
ISSN: 1559-128X
电子 ISSN: 2155-3165
________________________________________
第 41 条,共 159 条
标题: One-dimensional photon counting detector with vernier position sensitive anode
作者: Yan, QR (Yan Qiu-Rong); Zhao, BS (Zhao Bao-Sheng); Yang, H (Yang Hao); Liu, YA (Liu Yong-An); Zhu, XP (Zhu Xiang-Ping); Li, M (Li Mei)
来源出版物: ACTA PHYSICA SINICA  卷: 59  期: 9  页: 6164-6171  出版年: SEP 2010 
Web of Science 核心合集中的 "被引频次": 3
被引频次合计: 3
摘要: One-dimensional photon counting detector with vernier position sensitive anode is reported. The decode principle and design of vernier position sensitive anode are described in detail. An ultraviolet photon counting system was built based on one-dimensional photon counting detector with vernier position sensitive anode. One-dimensional coordinates of single-photon events can be simultaneously measured when the detection system works in photon counting mode. The spatial distribution of pulse counts, which corresponds to one-dimensional spatial distribution of incident light intensity, was obtained. The resolution of this system is better than 100 m mu according to the resolution test. The detector can detect one-dimensional spatial distribution of the intensity of very weak particle flow such as high-energy photons, electrons and ions flow, so it can be used for deep space exploration, spectral measurement, high-energy physics and bio-luminescence detection.
文献类型: Article
作者关键词: photon counting; vernier anode; micro-channel plate; one dimension
KeyWords Plus: IMAGING-SYSTEM; RESOLUTION
Web of Science 类别: Physics, Multidisciplinary
研究方向: Physics
IDS 号: 645JA
ISSN: 1000-3290
________________________________________
第 42 条,共 159 条
标题: Experimental research on high-energy dissipative solitons in an erbium-doped fiber laser
作者: Wang, LR (Wang Lei-Ran); Liu, XM (Liu Xue-Ming); Gong, YK (Gong Yong-Kang)
来源出版物: ACTA PHYSICA SINICA  卷: 59  期: 9  页: 6200-6204  出版年: SEP 2010 
Web of Science 核心合集中的 "被引频次": 4
被引频次合计: 5
摘要: We have employed a nonlinear polarization rotation technique to realize the self-starting passive mode-locking in an erbium-doped fiber laser with positive dispersion. The laser can emit high-energy dissipative solitons without wave-breaking. The pulse-shaping mechanism, which is qualitatively distinct from the conservative solitons in negative dispersion cavity, may originate from the laser gain, loss, NPR, cavity dispersion, or other fiber nonlinearity effects. To our best knowledge, it is the first report on the experimental observations for high-energy wave-breaking-free dissipative solitons forming in a fiber laser with ultra-large net-normal cavity dispersion. The spectrum of these strongly chirped pulses covers the wavelength range from 1530 to 1660 nm. The FWHM width of the spectrum can be as large as 42 nm, and the maximal total energy of a single-pulse is estimated to be similar to 34.4 nJ.
文献类型: Article
作者关键词: fiber laser; dissipative soliton; chirp
KeyWords Plus: NORMAL-DISPERSION; PULSE-PROPAGATION; RING LASER; GENERATION; CAVITY
Web of Science 类别: Physics, Multidisciplinary
研究方向: Physics
IDS 号: 645JA
ISSN: 1000-3290
________________________________________
第 43 条,共 159 条
标题: Study of ultraviolet photon counting imaging technology based on induction readout
作者: Zhao, FF (Zhao Fei-Fei); Zhao, BS (Zhao Bao-Sheng); Liu, YA (Liu Yong-An); Hu, HJ (Hu Hui-Jun); Cao, XB (Cao Xi-Bin)
来源出版物: ACTA PHYSICA SINICA  卷: 59  期: 9  页: 6306-6311  出版年: SEP 2010 
Web of Science 核心合集中的 "被引频次": 1
被引频次合计: 1
摘要: An ultraviolet photon counting imaging system based on charge induction readout was built and its structure, working principle and spatial resolution are reported. The single photon stream, can be obtained via atmospheric dispersion, some weakeners, and narrow-band optical filters. A photo-electron produced in microchannel plate is multiplied, forming a charge cloud, which is collected on the Ge film and then detected through capacitive coupling by a PSA located a few millimeters behind the Ge film. The signal data from the anode is acquired and processed with software after being transformed, filtered and shaped by a charge-sensitive preamplifier and a main amplifier in sequence. Finally, a 30-minute counting image is obtained. The resolution of this system can reach 150 micrometers as tested with the resolution board, and the influence of Ge film resistivity and its substrate thickness on the performance of this system is also analyzed. The system is beneficial in good imaging properties and time resolution to bioluminescence, astronomy and nuclear radiant detection.
文献类型: Article
作者关键词: photon counting image; charge induction; Ge films; position sensitive anode
KeyWords Plus: MICROCHANNEL PLATE DETECTORS; HIGH-RESOLUTION; POSITION; SYSTEM
Web of Science 类别: Physics, Multidisciplinary
研究方向: Physics
IDS 号: 645JA
ISSN: 1000-3290
________________________________________
第 44 条,共 159 条
标题: Experimental investigation of square dissipative soliton generation and propagation
作者: Mao, D (Mao, Dong); Liu, XM (Liu, Xueming); Wang, LR (Wang, Leiran); Lu, H (Lu, Hua)
来源出版物: APPLIED OPTICS  卷: 49  期: 25  页: 4751-4755  DOI: 10.1364/AO.49.004751  出版年: SEP 1 2010 
Web of Science 核心合集中的 "被引频次": 5
被引频次合计: 6
摘要: We have experimentally investigated the generation and propagation of square dissipative solitons emitted from an erbium-doped fiber laser with large normal cavity dispersion. The square pulse exhibits an approximately Gaussian spectral profile and large frequency chirp on its edges. When the square pulse propagates through a segment of single-mode fiber (SMF), it can be shaped to a Gaussian pulse and the corresponding spectrum will have a redshift with a prolonged wing on the longer wavelength. Our experiments show that the pulse evolution in the SMF is determined by the combined effects of the fiber dispersion, intrapulse Raman scattering, and the pulse initial chirps. (c) 2010 Optical Society of America
PubMed ID: 20820217
文献类型: Article
KeyWords Plus: DOPED FIBER LASER; NORMAL-DISPERSION; PULSE TRANSMISSION
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 649DP
ISSN: 1559-128X
电子 ISSN: 2155-3165
________________________________________
第 45 条,共 159 条
标题: Wavelength dependence four-wave mixing spectroscopy in a micrometric atomic vapour
作者: Li, YY (Li Yuan-Yuan); Li, L (Li Li); Zhang, YP (Zhang Yan-Peng); Bi, SW (Bi Si-Wen)
来源出版物: CHINESE PHYSICS B  卷: 19  期: 9  文献号: 090702  出版年: SEP 2010 
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 presents a theoretical study of wavelength dependence four-wave-mixing (FWM) spectroscopy in a micrometric thin atomic vapour. It compares three cases termed as mismatched case I, matched case and mismatched case II for the probe wavelength less, equal and greater than the pump wavelength respectively. It finds that Dicke-narrowing can overcome width broadening induced by Doppler effects and polarisation interference of thermal atoms, and high resolution FWM spectra can be achieved both in matched and mismatched wavelength for many cases. It also finds that the magnitude of the FWM signal can be dramatically modified to be suppressed or to be enhanced in comparison with that of matched wavelength in mismatched case I or II. The width narrowing and the magnitude suppression or enhancement can be demonstrated by considering enhanced contribution of slow atoms induced by atom-wall collision and transient effect of atom-light interaction in a micrometric thin vapour.
文献类型: Article
作者关键词: four-wave mixing; wavelength match; Dicke-narrowing; polarisation interference
KeyWords Plus: ELECTROMAGNETICALLY INDUCED TRANSPARENCY; 2 DIELECTRIC WALLS; REFLECTION; LAMBDA
Web of Science 类别: Physics, Multidisciplinary
研究方向: Physics
IDS 号: 654RT
ISSN: 1674-1056
________________________________________
第 46 条,共 159 条
标题: Color to Gray: Visual Cue Preservation
作者: Song, ML (Song, Mingli); Tao, DC (Tao, Dacheng); Chen, C (Chen, Chun); Li, XL (Li, Xuelong); Chen, CW (Chen, Chang Wen)
来源出版物: IEEE TRANSACTIONS ON PATTERN ANALYSIS AND MACHINE INTELLIGENCE  卷: 32  期: 9  页: 1537-1552  DOI: 10.1109/TPAMI.2009.74  出版年: SEP 2010 
Web of Science 核心合集中的 "被引频次": 38
被引频次合计: 40
摘要: Both commercial and scientific applications often need to transform color images into gray-scale images, e. g., to reduce the publication cost in printing color images or to help color blind people see visual cues of color images. However, conventional color to gray algorithms are not ready for practical applications because they encounter the following problems: 1) Visual cues are not well defined so it is unclear how to preserve important cues in the transformed gray-scale images; 2) some algorithms have extremely high time cost for computation; and 3) some require human-computer interactions to have a reasonable transformation. To solve or at least reduce these problems, we propose a new algorithm based on a probabilistic graphical model with the assumption that the image is defined over a Markov random field. Thus, color to gray procedure can be regarded as a labeling process to preserve the newly well-defined visual cues of a color image in the transformed gray-scale image. Visual cues are measurements that can be extracted from a color image by a perceiver. They indicate the state of some properties of the image that the perceiver is interested in perceiving. Different people may perceive different cues from the same color image and three cues are defined in this paper, namely, color spatial consistency, image structure information, and color channel perception priority. We cast color to gray as a visual cue preservation procedure based on a probabilistic graphical model and optimize the model based on an integral minimization problem. We apply the new algorithm to both natural color images and artificial pictures, and demonstrate that the proposed approach outperforms representative conventional algorithms in terms of effectiveness and efficiency. In addition, it requires no human-computer interactions.
PubMed ID: 20634551
文献类型: Article
作者关键词: Color to gray; probabilistic graphical model; visual cue
KeyWords Plus: IMAGES; CONVERSION; TEXTURE
Web of Science 类别: Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic
研究方向: Computer Science; Engineering
IDS 号: 626MB
ISSN: 0162-8828
________________________________________
第 47 条,共 159 条
标题: Low-timing-jitter, stretched-pulse passively mode-locked fiber laser with tunable repetition rate and high operation stability
作者: Liu, YS (Liu, Yuanshan); Zhang, JG (Zhang, Jian-Guo); Chen, GF (Chen, Guofu); Zhao, W (Zhao, Wei); Bai, J (Bai, Jing)
来源出版物: JOURNAL OF OPTICS  卷: 12  期: 9  文献号: 095204  DOI: 10.1088/2040-8978/12/9/095204  出版年: SEP 2010 
Web of Science 核心合集中的 "被引频次": 6
被引频次合计: 8
摘要: We design a low-timing-jitter, repetition-rate-tunable, stretched-pulse passively mode-locked fiber laser by using a nonlinear amplifying loop mirror (NALM), a semiconductor saturable absorber mirror (SESAM), and a tunable optical delay line in the laser configuration. Low-timing-jitter optical pulses are stably produced when a SESAM and a 0.16 m dispersion compensation fiber are employed in the laser cavity. By inserting a tunable optical delay line between NALM and SESAM, the variable repetition-rate operation of a self-starting, passively mode-locked fiber laser is successfully demonstrated over a range from 49.65 to 50.47 MHz. The experimental results show that the newly designed fiber laser can maintain the mode locking at the pumping power of 160 mW to stably generate periodic optical pulses with width less than 170 fs and timing jitter lower than 75 fs in the 1.55 mu m wavelength region, when the fundamental repetition rate of the laser is continuously tuned between 49.65 and 50.47 MHz. Moreover, this fiber laser has a feature of turn-key operation with high repeatability of its fundamental repetition rate in practice.
文献类型: Article
作者关键词: mode-locked lasers; laser stabilization; tunable lasers; fiber lasers; pulse generation
KeyWords Plus: RING LASER; GENERATION; LOCKING; SYNCHRONIZATION; MIRROR; SIGNAL
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 653XY
ISSN: 2040-8978
________________________________________
第 48 条,共 159 条
标题: Generation of multiple spherical spots with a radially polarized beam in a 4 pi focusing system
作者: Yan, SH (Yan, Shaohui); Yao, BL (Yao, Baoli); Zhao, W (Zhao, Wei); Lei, M (Lei, Ming)
来源出版物: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION  卷: 27  期: 9  页: 2033-2037  出版年: SEP 2010 
Web of Science 核心合集中的 "被引频次": 10
被引频次合计: 13
摘要: We demonstrate the possibility of creating multiple spherical spots in a 4 pi focusing system with a radially polarized beam. Using spherical waves to expand the plane wave factor in the Richards-Wolf integral, it is found that a proper spatial modulation in the amplitude of the input field with radial polarization can form multiple spherical spots with a focusing system satisfying the Herschel condition. These spots are distributed symmetrically about the focus on the optical axis with variable positions and intensities. Although we consider only the case of three spherical spots in this paper, generalization to the multiple-spots case will present no difficulty. (C) 2010 Optical Society of America
PubMed ID: 20808413
文献类型: Article
KeyWords Plus: LASER-BEAM; LIGHT; VACUUM; FORCES; OPTICS; FIELD
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 648DZ
ISSN: 1084-7529
________________________________________
第 49 条,共 159 条
标题: Design of Topas photonic bandgap fiber with high birefringence and low confinement loss
作者: Wang, DD (Wang, Doudou); Wang, LL (Wang, Lili)
来源出版物: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT  卷: 621  期: 1-3  页: 548-551  DOI: 10.1016/j.nima.2010.05.045  出版年: SEP 2010 
Web of Science 核心合集中的 "被引频次": 0
被引频次合计: 1
摘要: A highly birefringent hollow-core photonic bandgap fiber based on Topas cyclic olefin copolymer is designed. The rhombic hollow-core with rounded corners is formed by omitting four central air holes of the cladding structure. The guided modes, birefringence and confinement loss of the fiber are investigated by using the full-vector finite element method. A high phase birefringence of the order of 10(-3), a group birefringence of the order of 10(-2) and confinement loss less than 0.1 dB/km are obtained at the central wavelength (1.55 mu m) range of the bandgap for fiber with seven rings of air holes in the cladding region. (C) 2010 Elsevier B.V. All rights reserved.
文献类型: Article
作者关键词: Photonic bandgap fiber; Polymer optical fiber; Birefringence; Finite element method; Topas COC
KeyWords Plus: POLYMER OPTICAL-FIBER; CRYSTAL FIBER; TRANSMISSION; FABRICATION; DISPERSION; PREFORMS; ARRAY
Web of Science 类别: Instruments & Instrumentation; Nuclear Science & Technology; Physics, Particles & Fields; Spectroscopy
研究方向: Instruments & Instrumentation; Nuclear Science & Technology; Physics; Spectroscopy
IDS 号: 641FB
ISSN: 0168-9002
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第 50 条,共 159 条
标题: Tunable and switchable multiwavelength fiber lasers with broadband range based on nonlinear polarization rotation technique
作者: Li, XH (Li, Xiaohui); Liu, XM (Liu, Xueming); Mao, D (Mao, Dong); Hu, XH (Hu, Xiaohong); Lu, H (Lu, Hua)
来源出版物: OPTICAL ENGINEERING  卷: 49  期: 9  文献号: 094303  DOI: 10.1117/1.3485754  出版年: SEP 2010 
Web of Science 核心合集中的 "被引频次": 7
被引频次合计: 7
摘要: Switchable multiwavelength fiber laser outputs with a wide tuning range are experimentally observed in an ultralong cavity. Because of the long spooled single-mode fiber and filter effect of the cavity, multiwavelength lasers with the spacing of similar to 14.5 nm are obtained. The proposed fiber laser has the capacity of simultaneously emitting the three wavelengths. By means of adjusting the polarization controllers, the arbitrary single- and dual-wavelength operations are achieved in our laser. (C) 2010 Society of Photo-Optical Instrumentation Engineers. [DOI: 10.1117/1.3485754]
文献类型: Article
作者关键词: fiber laser; switchable multiwavelength; fiber optics amplifiers; oscillators
KeyWords Plus: ERBIUM-DOPED FIBER; PHOTONIC CRYSTAL FIBER; RING LASER; BRAGG GRATINGS; LOOP MIRROR
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 656VY
ISSN: 0091-3286

第 51 条,共 159 条
标题: Approximate analytical optical transfer function for a wavefront-coded imaging system with two-dimensional rectangularly separable phase masks
作者: Zhao, H (Zhao, Hui); Li, YC (Li, Yingcai)
来源出版物: OPTICAL ENGINEERING  卷: 49  期: 9  文献号: 093201  DOI: 10.1117/1.3485759  出版年: SEP 2010 
Web of Science 核心合集中的 "被引频次": 0
被引频次合计: 0
摘要: Wavefront coding can be used to extend the depth of field of incoherent imaging systems and is a powerful system-level technique. In order to assess the performance of a wavefront-coded imaging system, defocused optical transfer function (OTF) is the metric frequently used. Unfortunately, to the best of our knowledge, among all types of phase masks, it is usually difficult to obtain the analytical OTF except the cubic one. Although numerical computation seems good enough for performance evaluation, the approximate analytical OTF is still indispensable because it can reflect the relationship between mask parameters and system frequency response in a clearer way. Thus, a method is proposed to derive the approximate analytical OTF for two-dimensional rectangularly separable phase masks. The analytical results are well consistent with the direct numerical computations, but the proposed method can be accepted only from engineering point of view and needs rigorous proof in future. (c) 2010 Society of Photo-Optical Instrumentation Engineers. [DOI: 10.1117/1.3485759]
文献类型: Article
作者关键词: wavefront-coded imaging; depth of field; approximate analytical optical transfer function
KeyWords Plus: LOGARITHMIC ASPHERE; EXTENDED DEPTH; CUBIC-PHASE; FIELD; EXTENSION; REPRESENTATION; ABERRATIONS
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 656VY
ISSN: 0091-3286
电子 ISSN: 1560-2303
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第 52 条,共 159 条
标题: Influence of driving mode on the operation stability of organic light-emitting diodes
作者: Zhang, W (Zhang, W.); Wu, Z (Wu, Z.); Zhang, X (Zhang, X.); Liang, S (Liang, S.); Jiao, B (Jiao, B.); Hou, X (Hou, X.)
来源出版物: OPTOELECTRONICS AND ADVANCED MATERIALS-RAPID COMMUNICATIONS  卷: 4  期: 9  页: 1379-1383  出版年: SEP 2010 
Web of Science 核心合集中的 "被引频次": 0
被引频次合计: 0
摘要: The influence of pulse current (PC) versus direct current (DC) driving mode on the operation stability of organic light-emitting diodes, which based on N,N'-di(naphthalene-1-yl)-N,N'-diphenylbenzidine (NPB) and tris(8-hydroxyquinoline) aluminum (Alq(3)) without hole-injection layer (HIL) and with two different HILs, was investigated. The two HILs were copper phthalocyanine (CuPc) and 4,4',4 ''-tris(3-methylphenylphenylamino) triphenylamine (m-MDTATA) respectively. It was found that the lifetimes of devices without HIL and with CuPc, m-MTDATA as the HIL under PC driving mode were 2, 1.5 and 0.9 times longer than that under DC driving mode respectively. Analysis of electrical characteristics of corresponding hole-only devices showed that the injected holes into device were greatly reduced by inserting m-MTDATA layer compared to the two other devices, and indicated that different ratios of the injected electrons / holes were obtained in these devices, which play a dominant role in the influence of driving mode on the operation stability.
文献类型: Article
作者关键词: OLED; Stability; Driving mode; Electrons/holes
KeyWords Plus: ELECTROLUMINESCENT DIODES; DEVICES; DEGRADATION; DEPENDENCE; EFFICIENCY; INJECTION
Web of Science 类别: Materials Science, Multidisciplinary; Optics
研究方向: Materials Science; Optics
IDS 号: 671OJ
ISSN: 1842-6573
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第 53 条,共 159 条
标题: Electronic structure and magnetism of Fe-doped SiC nanotubes
作者: Zhang, WH (Zhang WeiHu); Zhang, FC (Zhang FuChun); Zhang, ZY (Zhang ZhiYong); Lu, SY (Lu ShuYuan); Yang, YN (Yang YanNing)
来源出版物: SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY  卷: 53  期: 9  页: 1582-1589  DOI: 10.1007/s11433-010-4089-8  出版年: SEP 2010 
Web of Science 核心合集中的 "被引频次": 4
被引频次合计: 4
摘要: The electronic structure and magnetic properties of Fe-doped SiC nanotubes are investigated by using the first-principles method based on density functional theory (DFT) in the local spin density approximation (LSDA). The calculation results indicate that the SiC nanotube of Fe substitution for C exhibits antiferromagnetism while ferromagnetism features prominently when Fe substitutes Si. This is a kind of half-metal magnetic material. The formation energy calculation results show that the formation energy of ferromagnetic structure is 3.2 eV lower than that of antiferromagnetic structure. Fe atoms are more likely to replace Si atoms. Spin-orbit coupling induces electron spin polarization in the ground state. Also, the doping Fe atoms make relaxation towards the outside of the tube to some extent and larger geometric distortion occurs when Fe substitutes C, but the whole geometric structure of SiC nanotubes is not damaged due to the doping. It is revealed in the calculation of energy band structure and density of states that more dispersed distribution of energy levels is produced near the Fermi level. For Fe substitution for Si, obviously there are spin-split and intense p-d hybrid effects by Si 3p electron spins and Fe 3d electron spins localized at the exchanging interactions between magnetic transitional metal (TM) impurities. Spin electronic density results indicate that system magnetic moments are mainly generated by the unpaired 3d electrons of Fe atoms. All these results show that the transition metal doping SiC nanotube could be a potential route to fabricating the promising magnetic materials.
文献类型: Article
作者关键词: SiC; nanotube; the first-principles; doped; magnetic properties
KeyWords Plus: MATERIALS SCIENCE; CARBON NANOTUBES; SILICON-CARBIDE; AB-INITIO; METAL; NANOWIRES; ATOM
Web of Science 类别: Physics, Multidisciplinary
研究方向: Physics
IDS 号: 637IE
ISSN: 1674-7348
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第 54 条,共 159 条
标题: Energy Transfer and Mid-Infrared Luminescence Properties of Tm3+/Dy3+ Codoped Chalcohalide Glasses
作者: Zhang, PJ (Zhang Peng-jun); Dai, SX (Dai Shi-xun); Cao, Y (Cao Ying); Peng, B (Peng Bo); Xu, TF (Xu Tie-feng); Nie, QH (Nie Qiu-hua); Zhang, XH (Zhang Xiang-hua)
来源出版物: SPECTROSCOPY AND SPECTRAL ANALYSIS  卷: 30  期: 9  页: 2321-2325  DOI: 10.3964/j.issn.1000-0593(2010)09-2321-05  出版年: SEP 2010 
Web of Science 核心合集中的 "被引频次": 0
被引频次合计: 0
摘要: series of chalcohalide glasses based on the composition 0. 9 (Ge-25 Ga-5 S-70)-0. 1CsI doped with the different Tm3+/Dy3+ ions ratio were synthesized by melt-quenching technique. The absorption spectra, and mid-infrared fluorescence of different glass samples under 800 nm laser excitation were measured. The results prove that, Tm3+ is an efficient sensitizer, which can enhance the Dy3+ : 2.9 mu m fluorescence intensity significantly. A decrease in the intensity of 1. 8 mu m fluorescence and lifetimes of the Tm3+ : F-3(4) level occurred with increasihg the concentration of Dy3+ ions from 0 to 1 Wt% where Tm3+ concentration was fixed to 0. 5 Wt%. Also a wide spectral oveflap between Tm3+ : 1. 8 mu m emission and the absorption of Dy3+ : H-6(15/2)-> H-6(11/2) level.
文献类型: Article
作者关键词: Mid-infrared emission; Chalcohalide glasses; Tm3+/Dy3+ codoped; Energy transfer
KeyWords Plus: LANTHANUM SULFIDE GLASS; OPTICAL-PROPERTIES; LASER GLASSES; SPECTROSCOPY; TRANSITIONS; DY3+; TM3+; HO3+; ABSORPTION; MECHANISMS
Web of Science 类别: Spectroscopy
研究方向: Spectroscopy
IDS 号: 648AA
ISSN: 1000-0593
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第 55 条,共 159 条
标题: Structured light sheet fluorescence microscopy based on four beam interference
作者: Lei, M (Lei, Ming); Zumbusch, A (Zumbusch, Andreas)
来源出版物: OPTICS EXPRESS  卷: 18  期: 18  页: 19232-19241  DOI: 10.1364/OE.18.019232  出版年: AUG 30 2010 
Web of Science 核心合集中的 "被引频次": 3
被引频次合计: 3
摘要: A 3D structured light sheet microscope using a four-faceted symmetric pyramid is presented. The sample is illuminated by the resulting four beam interference field. This approach combines advantages of standing wave and structured illumination microscopy. Examples of micrographs of fluorescently labeled Chinese hamster ovary (CHO) cells as well as of the compound eyes of drosophila are shown and the optical sectioning ability of our system is demonstrated. The capabilities and the limitations of the scheme are discussed. (C) 2010 Optical Society of America
PubMed ID: 20940819
文献类型: Article
KeyWords Plus: STANDING-WAVE EXCITATION; ILLUMINATION MICROSCOPY; AXIAL RESOLUTION; DIMENSIONS
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 653PE
ISSN: 1094-4087
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第 56 条,共 159 条
标题: Tunable band-pass plasmonic waveguide filters with nanodisk resonators
作者: Lu, H (Lu, Hua); Liu, XM (Liu, Xueming); Mao, D (Mao, Dong); Wang, LR (Wang, Leiran); Gong, YK (Gong, Yongkang)
来源出版物: OPTICS EXPRESS  卷: 18  期: 17  页: 17922-17927  DOI: 10.1364/OE.18.017922  出版年: AUG 16 2010 
Web of Science 核心合集中的 "被引频次": 73
被引频次合计: 75
摘要: A novel and simple plasmonic filter based on metal-insulator-metal plasmonic waveguides with a nanodisk resonator is proposed and investigated numerically. By the resonant theory of disk-shaped nanocavity, we find that the resonance wavelengths can be easily manipulated by adjusting the radius and refractive index of the nanocavity, which is in good agreement with the results obtained by finite-difference time-domain (FDTD) simulations. In addition, the bandwidths of resonance spectra are tunable by changing the coupling distance between the nanocavity and waveguides. This result achieved by FDTD simulations can be accurately analyzed by temporal coupled mode theory. Our filters have important potential applications in high-density plasmonic integration circuits. (C) 2010 Optical Society of America
PubMed ID: 20721178
文献类型: Article
KeyWords Plus: METAL; POLARITON; TRANSMISSION; CAVITY
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 640LZ
ISSN: 1094-4087
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第 57 条,共 159 条
标题: L1-Norm-Based 2DPCA
作者: Li, XL (Li, Xuelong); Pang, YW (Pang, Yanwei); Yuan, YA (Yuan, Yuan)
来源出版物: IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS PART B-CYBERNETICS  卷: 40  期: 4  特刊: SI  页: 1170-1175  DOI: 10.1109/TSMCB.2009.2035629  出版年: AUG 2010 
Web of Science 核心合集中的 "被引频次": 23
被引频次合计: 28
摘要: In this paper, we first present a simple but effective L1-norm-based two-dimensional principal component analysis (2DPCA). Traditional L2-norm-based least squares criterion is sensitive to outliers, while the newly proposed L1-norm 2DPCA is robust. Experimental results demonstrate its advantages.
PubMed ID: 20083461
文献类型: Article
作者关键词: L1 norm; outlier; subspace; two-dimensional principal component analysis (2DPCA)
KeyWords Plus: PRINCIPAL COMPONENT ANALYSIS; FACE-RECOGNITION; 2-DIMENSIONAL PCA; REPRESENTATION; APPEARANCE; ALGORITHMS
Web of Science 类别: Automation & Control Systems; Computer Science, Artificial Intelligence; Computer Science, Cybernetics
研究方向: Automation & Control Systems; Computer Science
IDS 号: 656PJ
ISSN: 1083-4419
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第 58 条,共 159 条
标题: Generation of 10 GHz, 1.9 ps optical pulse train using semiconductor optical amplifier and silica-based highly nonlinear fiber
作者: Yan, SY (Yan, S. Y.); Xie, XP (Xie, X. P.); Hui, ZQ (Hui, Z. Q.); Feng, H (Feng, H.); Zhao, W (Zhao, W.)
来源出版物: JOURNAL OF OPTICS  卷: 12  期: 8  特刊: SI  文献号: 085401  DOI: 10.1088/2040-8978/12/8/085401  出版年: AUG 2010 
Web of Science 核心合集中的 "被引频次": 1
被引频次合计: 1
摘要: We propose a simple approach to generate a high quality 10 GHz 1.9 ps optical pulse train using a semiconductor optical amplifier and silica-based highly nonlinear fiber. An optical pulse generator based on our proposed scheme is easy to set up with commercially available optical components. A 10 GHz, 1.9 ps optical pulse train is obtained with timing jitter as low as 60 fs over the frequency range 10 Hz-1 MHz. With a wavelength tunable CW laser, a wide wavelength tunable span can be achieved over the entire C band. The proposed optical pulse generator also can operate at different repetition rates from 3 to 10 GHz.
文献类型: Article
作者关键词: self-phase modulation; cross gain modulation; semiconductor optical amplifier; highly nonlinear fiber
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 636KF
ISSN: 2040-8978
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第 59 条,共 159 条
标题: Optimized logarithmic phase masks used to generate defocus invariant modulation transfer function for wavefront coding system
作者: Zhao, H (Zhao, Hui); Li, YC (Li, Yingcai)
来源出版物: OPTICS LETTERS  卷: 35  期: 15  页: 2630-2632  出版年: AUG 1 2010 
Web of Science 核心合集中的 "被引频次": 10
被引频次合计: 10
摘要: In a previous Letter [Opt. Lett. 33, 1171 (2008)], we proposed an improved logarithmic phase mask by making modifications to the original one designed by Sherif. However, further studies in another paper [Appl. Opt. 49, 229 (2010)] show that even when the Sherif mask and the improved one are optimized, their corresponding defocused modulation transfer functions (MTFs) are still not stable with respect to focus errors. So, by further modifying their phase profiles, we design another two logarithmic phase masks that exhibit more stable defocused MTF. However, with the defocus-induced phase effect considered, we find that the performance of the two masks proposed in this Letter is better than the Sherif mask, but worse than our previously proposed phase mask, according to the Hilbert space angle. (C) 2010 Optical Society of America
PubMed ID: 20680081
文献类型: Article
KeyWords Plus: INCOHERENT IMAGING-SYSTEM; DEPTH; FIELD; EXTEND
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 640MW
ISSN: 0146-9592
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第 60 条,共 159 条
标题: Plasma Properties of 532 nm Laser-Ablated Aluminum E414d Target with Direrent Power Densities
作者: Luo, WF (Luo Wenfeng); Sun, QB (Sun Qibing); Gao, CX (Gao Cunxiao); Tang, J (Tang Jie); Wang, HJ (Wang Haojing); Zhao, W (Zhao Wei)
来源出版物: PLASMA SCIENCE & TECHNOLOGY  卷: 12  期: 4  页: 385-390  DOI: 10.1088/1009-0630/12/4/01  出版年: AUG 2010 
Web of Science 核心合集中的 "被引频次": 1
被引频次合计: 1
摘要: Optical emission spectra of the plasma generated by a 532 nm Nd:YAG laser irradiation onto a standard aluminum alloy (E414d) was recorded and analyzed. The electron temperature was determined using the Boltzmann plot method with three aluminum spectral lines at 236.71 nm, 257.509 nm and 308.215 nm, where as the electron density was inferred by measuring the Stark broadening line profile of Al(II) 281.619 nm. The experimental results confirmed that the local thermodynamic equilibrium was valid and the plasma was optically thin. The spectral line intensity increased initially with the increase in laser irradiance and saturated at higher ir-radiance levels. Results showed that the energy losses due to the reflection of laser beam from the plasma itself were insignificant. The absorption in the plasma through inverse bremsstrahlung and two-photon ionization were studied. At the same time, the variation of transition probability ratio of Al(I) 309.28 nm to Al(I) 308.21 nm with laser power density was also studied.
文献类型: Article
作者关键词: LIBS; plasma; emission spectroscopy
KeyWords Plus: SPECTROMETRY; DIAGNOSTICS; PRESSURE; SILICON; ALLOYS; LIBS; ZINC
Web of Science 类别: Physics, Fluids & Plasmas
研究方向: Physics
IDS 号: 652FW
ISSN: 1009-0630
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第 61 条,共 159 条
标题: The global image of the Moon obtained by the Chang'E-1: Data processing and lunar cartography
作者: Li, CL (Li ChunLai); Liu, JJ (Liu JianJun); Ren, X (Ren Xin); Mou, LL (Mou LingLi); Zou, YL (Zou YongLiao); Zhang, HB (Zhang HongBo); Lu, C (Lue Chang); Liu, JZ (Liu JianZhong); Zuo, W (Zuo Wei); Su, Y (Su Yan); Wen, WB (Wen WeiBin); Bian, W (Bian Wei); Zhao, BC (Zhao BaoChang); Yang, JF (Yang JianFeng); Zou, XD (Zou XiaoDuan); Wang, M (Wang Min); Xu, C (Xu Chun); Kong, DQ (Kong DeQing); Wang, XQ (Wang XiaoQian); Wang, F (Wang Fang); Geng, LA (Geng Liang); Zhang, ZB (Zhang ZhouBin); Zheng, L (Zheng Lei); Zhu, XY (Zhu XinYing); Li, JD (Li JunDuo); Ouyang, ZY (Ouyang ZiYuan)
来源出版物: SCIENCE CHINA-EARTH SCIENCES  卷: 53  期: 8  页: 1091-1102  DOI: 10.1007/s11430-010-4016-x  出版年: AUG 2010 
Web of Science 核心合集中的 "被引频次": 15
被引频次合计: 19
摘要: The global lunar image of the first phase of Chinese Lunar Exploration Program is the first image that covered all over the surface of the Moon. It will serve as a critical foundation for succeeding exploration and scientific research. In this paper, the acquisition, characteristics, and data quality of Chang'E-1 CCD image data are described in detail. Also described are the methodology and procedure of data processing. According to rule of planetary cartography, the image data have been processed, geometrically corrected, and then mosaicked and merged in a scale of 1:2.5 million. The results of data processing and charting show that the image data of Chang'E-1 CCD and their geometric precision meet the demand of charting a map in the scale of 1:2.5 million. The relative geometric positioning precision of the global image is better than 240 m, and the absolute geometric positioning precision is slightly better than that of the ULCN2005 and Clementine lunar basemap (V2.0). The plane positioning precision is approximately 100-1500 m. This global image proves to be the best global image of the Moon so far in terms of space coverage, image quality, and positioning precision.
文献类型: Article
作者关键词: Chang'E-1; lunar CCD data processing; lunar image position; lunar global image
Web of Science 类别: Geosciences, Multidisciplinary
研究方向: Geology
IDS 号: 635FZ
ISSN: 1674-7313
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第 62 条,共 159 条
标题: Moving corner-cube mirror interferometer and reflection characteristic of corner-cube mirror
作者: Yang, QH (Yang, Qinghua)
来源出版物: APPLIED OPTICS  卷: 49  期: 21  页: 4088-4095  DOI: 10.1364/AO.49.004088  出版年: JUL 20 2010 
Web of Science 核心合集中的 "被引频次": 5
被引频次合计: 6
摘要: A novel moving corner-cube mirror interferometer (MCCMI) is presented. It has neither tilt nor shearing problems. It consists of one moving corner-cube mirror (MCCM), one fixed double-sided mirror (FDSM), one fixed plane mirror, and one beam splitter. The FDSM is a plane-parallel glass plate with both faces coated with high-reflectivity films. The effect of a FDSM tilt is analyzed. The optical path difference (OPD) is created by the straight reciprocating motion of the MCCM, and the OPD value is four times the displacement of the MCCM. The reflection characteristic of the corner-cube mirror (CCM) is analyzed by means of the vector expression, and the formulas of deviation angle of a CCM are derived. The effect of a MCCM deviation angle is analyzed. The new MCCMI is very suitable for high-resolution Fourier-transform infrared spectrometers used for atmospheric sounding. (C) 2010 Optical Society of America
PubMed ID: 20648193
文献类型: Article
KeyWords Plus: FOURIER-TRANSFORM SPECTROSCOPY; CATS-EYE RETROREFLECTOR; PARAXIAL RAY ANALYSIS; MICHELSON INTERFEROMETER; RESOLUTION; SPECTROMETER; PERFORMANCE; INFORMATION; DESIGN; IR
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 628LY
ISSN: 1559-128X
电子 ISSN: 2155-3165
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第 63 条,共 159 条
标题: Cellulose acetate polymer film modified microstructured polymer optical fiber towards a nitrite optical probe
作者: Li, DD (Li, Dongdong); Wang, LL (Wang, Lili)
来源出版物: OPTICS COMMUNICATIONS  卷: 283  期: 14  页: 2841-2844  DOI: 10.1016/j.optcom.2010.04.005  出版年: JUL 15 2010 
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 microstructured polymer optical fiber (MPOF) probe for nitrites (NO(2)(-)) detection was made by forming rhodamine 6G (Rh 6G)-doped cellulose acetate (CA) on the side wall of array holes in a MPOF It was found that the MPOF probe only have a response to nitrites in a certain concentration of sulfuric acid solution The calibration graph of fluorescence intensity versus nitrites concentration was linear in the range of 2.0 x 10(-4) g/ml-5.0 x 10(-3) g/ml. The method possesses case of chemical modification, low cost design, and potential for direct integration with existing instrumentation, and has been applied to the determination of nitrites in real samples with satisfactory results. (C) 2010 Elsevier B.V. All rights reserved
文献类型: Article
作者关键词: Optical sensing; Fluorescence; Microstructured polymer optical fiber; Nitrites
KeyWords Plus: PHOTONIC CRYSTAL FIBERS; PRODUCTS; NITRATE
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 615LB
ISSN: 0030-4018
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第 64 条,共 159 条
标题: Ultrashort optical pulse monitoring using asynchronous optical sampling technique in highly nonlinear fiber
作者: Tang, DK (Tang, Dingkang); Zhang, JG (Zhang, Jianguo); Liu, YS (Liu, Yuanshan); Zhao, W (Zhao, Wei)
来源出版物: CHINESE OPTICS LETTERS  卷: 8  期: 7  页: 630-633  DOI: 10.3788/COL20100807.0630  出版年: JUL 10 2010 
Web of Science 核心合集中的 "被引频次": 5
被引频次合计: 11
摘要: An asynchronous optical sampling scheme based on four-wave mixing (FWM) in highly nonlinear fiber (HNLF) is experimentally demonstrated. Based on this scheme, 10-GHz input pulse train with 1.8-ps pulse width is successfully sampled in 100-m HNLF. A single pulse at 10 GHz with 2.3-ps pulse width is rebuilt by using a 50-MHz frequency tunable free-running fiber laser as the sampling pulse source (SPS). 40-GHz pulse train is used as the input signal. The rebuilt waveforms, together with the low-jitter eye diagram, are also presented.
文献类型: Article
KeyWords Plus: EYE-DIAGRAM MEASUREMENT; LOCKED LASER-DIODE
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 627FO
ISSN: 1671-7694
________________________________________
第 65 条,共 159 条
标题: Luminescent properties of Nd3+-doped LaF3 core/shell nanoparticles with enhanced near infrared (NIR) emission
作者: Cui, XX (Cui, Xiaoxia); She, JB (She, Jiangbo); Gao, C (Gao, Chao); Cui, K (Cui, Kai); Hou, CQ (Hou, Chaoqi); Wei, W (Wei, Wei); Peng, B (Peng, Bo)
来源出版物: CHEMICAL PHYSICS LETTERS  卷: 494  期: 1-3  页: 60-63  DOI: 10.1016/j.cplett.2010.05.070  出版年: JUL 9 2010 
Web of Science 核心合集中的 "被引频次": 13
被引频次合计: 14
摘要: A kind of Nd3+-doped LaF3 nanoparticles with core/shell structure were synthesized via a co-precipitation method. The possible formation mechanisms for the core/shell architectures were presented. The X-ray diffraction (XRD) patterns indicated that the obtained nanoparticles exhibit hexagonal structure. In comparison with LaF3:Nd core nanoparticles, the fluorescence intensity and lifetime were increased by 140% and 150% respectively in LaF3:Nd/LaF3 core/shell nanoparticles. The obvious features are mainly attributed to the formation of LaF3 shell which effectively protected the Nd3+ ions from surrounding influence. The results show that rare-earth-doped nanoparticles with core/shell structure have potential applications in biological labeling and light-emitting devices. (C) 2010 Elsevier B.V. All rights reserved.
文献类型: Article
KeyWords Plus: PHOTOLUMINESCENT PROPERTIES; WHITE-LIGHT; NANOCRYSTALS; CEF3-TB3+; FLUORIDE; GREEN; CEF3
Web of Science 类别: Chemistry, Physical; Physics, Atomic, Molecular & Chemical
研究方向: Chemistry; Physics
IDS 号: 618PL
ISSN: 0009-2614
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第 66 条,共 159 条
标题: Multistage etching process for microscopically smooth tellurite glass surfaces in optical fibers
作者: Zhang, AD (Zhang, Aidong); Lin, AX (Lin, Aoxiang); Wang, JS (Wang, Jau-Sheng); Toulouse, J (Toulouse, Jean)
来源出版物: JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B  卷: 28  期: 4  页: 682-686  DOI: 10.1116/1.3437017  出版年: JUL 2010 
Web of Science 核心合集中的 "被引频次": 1
被引频次合计: 1
摘要: Bulk samples of tellurite glass with composition 75TeO(2)-20ZnO-5Na(2)O (TZN) were fabricated by melting and quenching techniques. In order to improve the surface quality of optical fiber preform made with this tellurite glass, the authors developed a multistage etching process. The relationship between successive etching treatments and roughness of the TZN glass surface was probed by using an atomic force microscope. The results demonstrate that this multistage etching method effectively improves this tellurite glass surface smoothness to a level comparable with that of a reference silica glass slide, and the corresponding chemical micromechanisms and fundamentals are discussed and confirmed by atomic force microscopy, potentially contributing to the development of multicomponent soft glass fibers and devices. (C) 2010 American Vacuum Society. [DOI: 10.1116/1.3437017]
文献类型: Article
KeyWords Plus: FLUOROTELLURITE GLASSES; ACID; NEODYMIUM; NMR
Web of Science 类别: Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied
研究方向: Engineering; Science & Technology - Other Topics; Physics
IDS 号: 640AP
ISSN: 1071-1023
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第 67 条,共 159 条
标题: THEORETICAL AND EXPERIMENTAL STUDY OF POLARIZATION CHARACTERISTICS OF POLARIZATION MAINTAINING FIBER BASED ON WAVELENGTH-SWEEPING MODULATION
作者: Duan, ZL (Duan, Zuo-Liang); Ren, LY (Ren, Li-Yong); Zhang, YN (Zhang, Ya-Ni); Wang, HY (Wang, Han-Yi); Yao, BL (Yao, Bao-Li); Zhao, W (Zhao, Wei)
来源出版物: MICROWAVE AND OPTICAL TECHNOLOGY LETTERS  卷: 52  期: 7  页: 1466-1469  DOI: 10.1002/mop.25244  出版年: JUL 2010 
Web of Science 核心合集中的 "被引频次": 3
被引频次合计: 3
摘要: We analyze theoretically the polarization characteristics of polarization maintaining fiber and study the basic measurement principles of beat length and polarization extinction ratio of this kind of optical fiber. According, to the dependence of the phase difference between two orthogonally polarized modes (denoted Os HE(11)(x) and HE(11)(y)) transmitted in the polarization maintaining fiber on the light wavelength, we propose the wavelength-sweeping modulation method to measure the beat length and the model birefringence. Based on this technique, the hew length and polarization extinction ratio of the PANDA polarization maintaining fibers (PMFs) (provided by Yangtze Optical Fiber and Cable Company, Wuhan, China) were investigated in detail. Experimental results show good consistent with the theoretical ones. We find that this method shows high measurement precision with the advantages of clear measurement principle and easy to operate. 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1466-1469, 2010; Published online in Wiley InterScience (
www.interscience.wiley.com). DOI 10.1002/mop.25244
文献类型: Article
作者关键词: polarization maintaining fiber; birefringence; beat length; polarization extinction ratio
KeyWords Plus: PHOTONIC-CRYSTAL FIBERS; OPTICAL-FIBER; BEAT LENGTH; BIREFRINGENCE
Web of Science 类别: Engineering, Electrical & Electronic; Optics
研究方向: Engineering; Optics
IDS 号: 595RF
ISSN: 0895-2477
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第 68 条,共 159 条
标题: A first-principles study of the size-dependent electronic properties of SiC nanotubes
作者: Zhang, WH (Zhang WeiHu); Zhang, FC (Zhang FuChun); Zhang, ZY (Zhang ZhiYong); Lu, SY (Lu ShuYuan); Yang, YN (Yang YanNing)
来源出版物: SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY  卷: 53  期: 7  页: 1333-1338  DOI: 10.1007/s11433-010-4029-7  出版年: JUL 2010 
Web of Science 核心合集中的 "被引频次": 2
被引频次合计: 3
摘要: We investigate the structural and electronic properties of SiC nanotubes (NTs) with hexagonal cross sections by a first-principles calculation using plane-wave ultra-soft pseudo-potential technology based on the density-functional theory. Our results reveal that surface-layer C and Si atoms relax significantly upon decreasing the tube-wall thickness because of surface-size and quantum-size effects. We also find that all relaxed SIC NTs stay stably on the nanoscale because of an admixture of sp(2) and sp(3) hybridization between C and Si atoms and a strong covalent, and that the band gap tends to decrease with increasing tube-wall thickness. Our calculations further indicate that both C and Si atoms on the inner and outer surface of SIC NTs contribute to defect states at the top of the valence band and at the bottom of the conduction band. These results provide reference information for a thorough understanding of the properties of SIC nanostructures and also enable more precise monitoring and control of the growth of SiC nanostructures.
文献类型: Article
作者关键词: density function theory; SiC; nanotube; electronic properties; quantum-size effects
KeyWords Plus: SILICON-CARBIDE NANOTUBES; CARBON NANOTUBES; AB-INITIO
Web of Science 类别: Physics, Multidisciplinary
研究方向: Physics
IDS 号: 629OY
ISSN: 1674-7348
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第 69 条,共 159 条
标题: Effect of self-generated magnetic fields on fast-electron beam divergence in solid targets
作者: Yuan, XH (Yuan, X. H.); Robinson, APL (Robinson, A. P. L.); Quinn, MN (Quinn, M. N.); Carroll, DC (Carroll, D. C.); Borghesi, M (Borghesi, M.); Clarke, RJ (Clarke, R. J.); Evans, RG (Evans, R. G.); Fuchs, J (Fuchs, J.); Gallegos, P (Gallegos, P.); Lancia, L (Lancia, L.); Neely, D (Neely, D.); Quinn, K (Quinn, K.); Romagnani, L (Romagnani, L.); Sarri, G (Sarri, G.); Wilson, PA (Wilson, P. A.); McKenna, P (McKenna, P.)
来源出版物: NEW JOURNAL OF PHYSICS  卷: 12  文献号: 063018  DOI: 10.1088/1367-2630/12/6/063018  出版年: JUN 11 2010 
Web of Science 核心合集中的 "被引频次": 18
被引频次合计: 18
摘要: The collimating effect of self-generated magnetic fields on fast-electron transport in solid aluminium targets irradiated by ultra-intense, picosecond laser pulses is investigated in this study. As the target thickness is varied in the range of 25 mu m to 1.4 mm, the maximum energies of protons accelerated from the rear surface are measured to infer changes in the fast-electron density and therefore the divergence of the fast-electron beam transported through the target. Purely ballistic spreading of the fast-electrons would result in a much faster decrease in the maximum proton energy with increasing target thickness than that measured. This implies that some degree of 'global' magnetic pinching of the fast-electrons occurs, particularly for thick (>400 mu m) targets. Numerical simulations of electron transport are in good agreement with the experimental data and show that the pinching effect of the magnetic field in thin targets is significantly reduced due to disruption of the field growth by refluxing fast-electrons.
文献类型: Article
KeyWords Plus: PROTON ACCELERATION; DRIVEN; TRANSPORT; IGNITION; PULSE; REAR
Web of Science 类别: Physics, Multidisciplinary
研究方向: Physics
IDS 号: 609DJ
ISSN: 1367-2630
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第 70 条,共 159 条
标题: Low-dispersion high-birefringence effect of squeezed hexagonal lattice elliptical hole photonic crystal fiber
作者: Zhang, YN (Zhang Ya-Ni)
来源出版物: ACTA PHYSICA SINICA  卷: 59  期: 6  页: 4050-4055  出版年: JUN 2010 
Web of Science 核心合集中的 "被引频次": 5
被引频次合计: 8
摘要: A new type of photonic crystal fiber for realizing the effect of low dispersion high birefringence is proposed The filet is composed of a solid silica core and a cladding with squeezed-hexagonal-lattice elliptical air-hole along the fiber length. Dispersion and birefringence are investigated simultaneously by using the full vectorial plane wave method Simulations indicate that the wavelength for realizing low-dispersion high-birefringence can be controlled by artificially choosing the structure parameters of photonic crystal fiber, such as the hexagonal lattice squeezing ratio, the relative an hole spacing and the air hole ellipticity. The optimal and feasible parameters of the fiber with low-dispersion high-birefringence are given, with the result of the total dispersion being within +/- 5 ps . nm(-1) km(-1) over an ultra broad wavelength range from 1360 to 1670 rim and the corresponding high birefringence being about 15 x 10(-2) at 1550 nm
文献类型: Article
作者关键词: fiber waveguides; full vectorial plane wave method; low-dispersion high-birefringence; hexagonal lattice squeezing ratio
KeyWords Plus: ERBIUM-DOPED FIBER; FLATTENED DISPERSION; OPTICAL-FIBERS; BRAGG GRATINGS; DESIGN; LASER
Web of Science 类别: Physics, Multidisciplinary
研究方向: Physics
IDS 号: 609QN
ISSN: 1000-3290
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第 71 条,共 159 条
标题: Design and optimization of highly nonlinear low-dispersion crystal fiber with high birefringence for four-wave mixing
作者: Zhang, YN (Zhang, Ya-Ni); Ren, LY (Ren, Li-Yong); Gong, YK (Gong, Yong-Kang); Li, XH (Li, Xiao-Hui); Wang, LR (Wang, Lei-Ran); Sun, CD (Sun, Chuan-Dong)
来源出版物: APPLIED OPTICS  卷: 49  期: 16  页: 3208-3214  DOI: 10.1364/AO.49.003208  出版年: JUN 1 2010 
Web of Science 核心合集中的 "被引频次": 10
被引频次合计: 12
摘要: We have proposed a novel type of photonic crystal fiber (PCF) with low dispersion and high nonlinearity for four-wave mixing. This type of fiber is composed of a solid silica core and a cladding with a squeezed hexagonal lattice elliptical airhole along the fiber length. Its dispersion and nonlinearity coefficient are investigated simultaneously by using the full vectorial finite element method. Numerical results show that the proposed highly nonlinear low-dispersion fiber has a total dispersion as low as +/- 2.5 ps nm(-1) km(-1) over an ultrabroad wavelength range from 1.43 to 1.8 mu m, and the corresponding nonlinearity coefficient and birefringence are about 150 W-1 km(-1) and 2.5 x 10(-3) at 1.55 mu m, respectively. The proposed PCF with low ultraflattened dispersion, high nonlinearity, and high birefringence can have important application in four-wave mixing. (C) 2010 Optical Society of America
PubMed ID: 20517392
文献类型: Article
KeyWords Plus: ULTRA-FLATTENED DISPERSION; ERBIUM-DOPED FIBER; SUPERCONTINUUM GENERATION; BRAGG GRATINGS; POLYMER; LASER
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 604GF
ISSN: 1559-128X
电子 ISSN: 2155-3165
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第 72 条,共 159 条
标题: Analysis of one-end-pumped Yb3+-doped gain guided and index antiguided fiber laser
作者: Zhou, E (Zhou, E.); Zhao, B (Zhao, B.); Wang, X (Wang, X.); Wang, Y (Wang, Y.); Wei, W (Wei, W.); Peng, B (Peng, B.)
来源出版物: APPLIED PHYSICS B-LASERS AND OPTICS  卷: 99  期: 4  页: 747-751  DOI: 10.1007/s00340-010-3919-8  出版年: JUN 2010 
Web of Science 核心合集中的 "被引频次": 3
被引频次合计: 4
摘要: The one-end-pumped Yb3+-doped gain guided and index antiguided (GG+IAG) fiber laser is analyzed with a rate equation model. By solving propagation rate equations, the pump and signal, the gain coefficients and other characteristics are obtained. Computation results show that a properly designed Yb3+-doped GG+IAG fiber laser can provide a large-mode laser with a short length. The most important issue addressed is the way of controlling the fiber laser length.
文献类型: Article
KeyWords Plus: SINGLE-MODE; CORE
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 607PZ
ISSN: 0946-2171
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第 73 条,共 159 条
标题: Local Feature Based Geometric-Resistant Image Information Hiding
作者: Gao, XB (Gao, Xinbo); Deng, C (Deng, Cheng); Li, XL (Li, Xuelong); Tao, DC (Tao, Dacheng)
来源出版物: COGNITIVE COMPUTATION  卷: 2  期: 2  页: 68-77  DOI: 10.1007/s12559-010-9033-8  出版年: JUN 2010 
Web of Science 核心合集中的 "被引频次": 8
被引频次合计: 8
摘要: Watermarking aims to hide particular information into some carrier but does not change the visual cognition of the carrier itself. Local features are good candidates to address the watermark synchronization error caused by geometric distortions and have attracted great attention for content-based image watermarking. This paper presents a novel feature point-based image watermarking scheme against geometric distortions. Scale invariant feature transform (SIFT) is first adopted to extract feature points and to generate a disk for each feature point that is invariant to translation and scaling. For each disk, orientation alignment is then performed to achieve rotation invariance. Finally, watermark is embedded in middle-frequency discrete Fourier transform (DFT) coefficients of each disk to improve the robustness against common image processing operations. Extensive experimental results and comparisons with some representative image watermarking methods confirm the excellent performance of the proposed method in robustness against various geometric distortions as well as common image processing operations.
文献类型: Article
作者关键词: Visual cognition; Image watermarking; Scale invariant feature transform; Orientation alignment; Discrete Fourier transform
KeyWords Plus: WATERMARKING SCHEME; FREQUENCY DOMAIN; FEATURE POINTS; DETECTORS; SCALE
Web of Science 类别: Computer Science, Artificial Intelligence; Neurosciences
研究方向: Computer Science; Neurosciences & Neurology
IDS 号: 792UR
ISSN: 1866-9956
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第 74 条,共 159 条
标题: A Video Quality Assessment Metric Based on Human Visual System
作者: Lu, W (Lu, Wen); Li, XL (Li, Xuelong); Gao, XB (Gao, Xinbo); Tang, WJ (Tang, Wenjian); Li, J (Li, Jing); Tao, DC (Tao, Dacheng)
来源出版物: COGNITIVE COMPUTATION  卷: 2  期: 2  页: 120-131  DOI: 10.1007/s12559-010-9040-9  出版年: JUN 2010 
Web of Science 核心合集中的 "被引频次": 1
被引频次合计: 2
摘要: It is important for practical application to design an effective and efficient metric for video quality. The most reliable way is by subjective evaluation. Thus, to design an objective metric by simulating human visual system (HVS) is quite reasonable and available. In this paper, the video quality assessment metric based on visual perception is proposed. Three-dimensional wavelet is utilized to decompose video and then extract features to mimic the multichannel structure of HVS. Spatio-temporal contrast sensitivity function (S-T CSF) is employed to weight coefficient obtained by three-dimensional wavelet to simulate nonlinearity feature of the human eyes. Perceptual threshold is exploited to obtain visual sensitive coefficients after S-T CSF filtered. Visual sensitive coefficients are normalized representation and then visual sensitive errors are calculated between reference and distorted video. Finally, temporal perceptual mechanism is applied to count values of video quality for reducing computational cost. Experimental results prove the proposed method outperforms the most existing methods and is comparable to LHS and PVQM.
文献类型: Article
作者关键词: Video quality assessment; Human visual system; Three-dimensional wavelet; Contrast sensitivity; Temporal perceptual mechanism
KeyWords Plus: DISTORTION; VISION; MOTION
Web of Science 类别: Computer Science, Artificial Intelligence; Neurosciences
研究方向: Computer Science; Neurosciences & Neurology
IDS 号: 792UR
ISSN: 1866-9956
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第 75 条,共 159 条
标题: Image Ratio Features for Facial Expression Recognition Application
作者: Song, ML (Song, Mingli); Tao, DC (Tao, Dacheng); Liu, ZC (Liu, Zicheng); Li, XL (Li, Xuelong); Zhou, MC (Zhou, Mengchu)
来源出版物: IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS PART B-CYBERNETICS  卷: 40  期: 3  特刊: SI  页: 779-788  DOI: 10.1109/TSMCB.2009.2029076  出版年: JUN 2010 
Web of Science 核心合集中的 "被引频次": 15
被引频次合计: 16
摘要: Video-based facial expression recognition is a challenging problem in computer vision and human-computer interaction. To target this problem, texture features have been extracted and widely used, because they can capture image intensity changes raised by skin deformation. However, existing texture features encounter problems with albedo and lighting variations. To solve both problems, we propose a new texture feature called image ratio features. Compared with previously proposed texture features, e. g., high gradient component features, image ratio features are more robust to albedo and lighting variations. In addition, to further improve facial expression recognition accuracy based on image ratio features, we combine image ratio features with facial animation parameters (FAPs), which describe the geometric motions of facial feature points. The performance evaluation is based on the Carnegie Mellon University Cohn-Kanade database, our own database, and the Japanese Female Facial Expression database. Experimental results show that the proposed image ratio feature is more robust to albedo and lighting variations, and the combination of image ratio features and FAPs outperforms each feature alone. In addition, we study asymmetric facial expressions based on our own facial expression database and demonstrate the superior performance of our combined expression recognition system.
PubMed ID: 19884092
文献类型: Article
作者关键词: Expression recognition; facial expression; image ratio features
KeyWords Plus: FACE RECOGNITION; DISCRIMINANT-ANALYSIS; INVARIANT; SAMPLE
Web of Science 类别: Automation & Control Systems; Computer Science, Artificial Intelligence; Computer Science, Cybernetics
研究方向: Automation & Control Systems; Computer Science
IDS 号: 597QO
ISSN: 1083-4419
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第 76 条,共 159 条
标题: A Unified Tensor Level Set for Image Segmentation
作者: Wang, B (Wang, Bin); Gao, XB (Gao, Xinbo); Tao, DC (Tao, Dacheng); Li, XL (Li, Xuelong)
来源出版物: IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS PART B-CYBERNETICS  卷: 40  期: 3  特刊: SI  页: 857-867  DOI: 10.1109/TSMCB.2009.2031090  出版年: JUN 2010 
Web of Science 核心合集中的 "被引频次": 22
被引频次合计: 25
摘要: This paper presents a new region-based unified tensor level set model for image segmentation. This model introduces a three-order tensor to comprehensively depict features of pixels, e.g., gray value and the local geometrical features, such as orientation and gradient, and then, by defining a weighted distance, we generalized the representative region-based level set method from scalar to tensor. The proposed model has four main advantages compared with the traditional representative method as follows. First, involving the Gaussian filter bank, the model is robust against noise, particularly the salt-and pepper-type noise. Second, considering the local geometrical features, e. g., orientation and gradient, the model pays more attention to boundaries and makes the evolving curve stop more easily at the boundary location. Third, due to the unified tensor pixel representation representing the pixels, the model segments images more accurately and naturally. Fourth, based on a weighted distance definition, the model possesses the capacity to cope with data varying from scalar to vector, then to high-order tensor. We apply the proposed method to synthetic, medical, and natural images, and the result suggests that the proposed method is superior to the available representative region-based level set method.
PubMed ID: 19887322
文献类型: Article
作者关键词: Gabor filter bank; geometric active contour; image segmentation; level set method; partial differential equation (PDE) and tensor field
KeyWords Plus: DISCRIMINANT-ANALYSIS; MODELS; FLOW; RECOGNITION; CURVATURE
Web of Science 类别: Automation & Control Systems; Computer Science, Artificial Intelligence; Computer Science, Cybernetics
研究方向: Automation & Control Systems; Computer Science
IDS 号: 597QO
ISSN: 1083-4419
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第 77 条,共 159 条
标题: Subspace Learning
作者: Li, XL (Li, Xuelong); Tao, DC (Tao, Dacheng)
来源出版物: NEUROCOMPUTING  卷: 73  期: 10-12  特刊: SI  页: 1539-1540  DOI: 10.1016/j.neucom.2010.02.012  出版年: JUN 2010 
Web of Science 核心合集中的 "被引频次": 5
被引频次合计: 5
文献类型: Editorial Material
Web of Science 类别: Computer Science, Artificial Intelligence
研究方向: Computer Science
IDS 号: 615KL
ISSN: 0925-2312
________________________________________
第 78 条,共 159 条
标题: Cubic sinusoidal phase mask: Another choice to extend the depth of field of incoherent imaging system
作者: Zhao, H (Zhao, Hui); Li, YC (Li, Yingcai); Feng, HJ (Feng, Huajun); Xu, ZH (Xu, Zhihai); Li, Q (Li, Qi)
来源出版物: OPTICS AND LASER TECHNOLOGY  卷: 42  期: 4  页: 561-569  DOI: 10.1016/j.optlastec.2009.10.004  出版年: JUN 2010 
Web of Science 核心合集中的 "被引频次": 6
被引频次合计: 6
摘要: Wave-front coding is a well known technique used to extend the depth of field of incoherent imaging system. The core of this technique lies in the design of suitable phase masks, among which the most important one is the cubic phase mask suggested by Dowski and Cathey (1995) [1]. In this paper, we propose a new type called cubic sinusoidal phase mask which is generated by combing the cubic one and another component having the sinusoidal form. Numerical evaluations and real experimental results demonstrate that the composite phase mask is superior to the original cubic phase mask with parameters optimized and provides another choice to achieve the goal of depth extension. (C) 2009 Elsevier Ltd. All rights reserved.
文献类型: Article
作者关键词: Wave-front coding; Sinusoidal component; Composite phase mask
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 553MX
ISSN: 0030-3992
________________________________________
第 79 条,共 159 条
标题: Experimental study on phase-locking of two high-power all-fiber lasers
作者: Zhao, BY (Zhao, Baoyin); Duan, KL (Duan, Kailang); Liu, Y (Liu, Yang); Zhao, W (Zhao, Wei)
来源出版物: OPTICS COMMUNICATIONS  卷: 283  期: 11  页: 2390-2393  DOI: 10.1016/j.optcom.2010.02.004  出版年: JUN 1 2010 
Web of Science 核心合集中的 "被引频次": 1
被引频次合计: 1
摘要: By using a novel mutual injection technique, phase-locking and coherent combining of two high-power all-fiber lasers are realized and experimentally demonstrated. Steady interference strips with high visibility of 46% are observed. The coherent combined 407 W CW output power with a power-combining efficiency of up to 98% is obtained. The laser array works well with excellent stability. In the long time of high-power operation no thermal distortions or damages are observed. The proposed technique can be used to further scale up the coherent combined output power of high-power fiber lasers. (C) 2010 Elsevier B.V. All rights reserved.
文献类型: Article
作者关键词: High-power all-fiber laser; Mutual injection phase-locking; Coherent combining
KeyWords Plus: CAVITY; AMPLIFIERS; ARRAY
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 598GW
ISSN: 0030-4018
________________________________________
第 80 条,共 159 条
标题: Effects of gain saturation on terahertz radiation via optical difference frequency generation
作者: Huang, N (Huang Nan); Li, XF (Li Xuefeng); Liu, HJ (Liu Hongjun); Xia, CP (Xia Caipeng)
来源出版物: OPTICS COMMUNICATIONS  卷: 283  期: 11  页: 2442-2445  DOI: 10.1016/j.optcom.2010.01.072  出版年: JUN 1 2010 
Web of Science 核心合集中的 "被引频次": 0
被引频次合计: 1
摘要: Numerical studies on stability of terahertz (THz) radiation generation based on difference frequency generation in nonlinear crystals are reported. When the gain saturation is achieved at a wavelength that corresponds to an optimal crystal length, the maximal output of THz radiation could be obtained. As a result of crystal absorption, the gain saturation region of THz radiation is unstable region for output. The stability of THz radiation is determined by the stability of pump in the stable region where behind of the gain saturation. (C) 2010 Elsevier B.V. All rights reserved.
文献类型: Article
作者关键词: Optical difference frequency generation; Terahertz (THz); Stability
KeyWords Plus: ZINC-GERMANIUM PHOSPHIDE; WAVES; CRYSTALS; RANGES
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 598GW
ISSN: 0030-4018
________________________________________
第 81 条,共 159 条
标题: Spectroscopic analysis of element concentrations in aluminum alloy using nanosecond laser-induced breakdown spectroscopy
作者: Luo, WF (Luo, Wenfeng); Tang, J (Tang, Jie); Gao, CX (Gao, Cunxiao); Wang, HJ (Wang, Haojing); Zhao, W (Zhao, Wei)
来源出版物: PHYSICA SCRIPTA  卷: 81  期: 6  文献号: 065302  DOI: 10.1088/0031-8949/81/06/065302  出版年: JUN 2010 
Web of Science 核心合集中的 "被引频次": 2
被引频次合计: 2
摘要: A plasma generated by 1064 nm Nd:YAG laser irradiation of aluminum alloy in air at atmospheric pressure was studied spectroscopically. The electron density was inferred by measuring the Stark broadened line profile of Cu( I) 324.75 nm, while the electron temperature was determined using the Boltzmann plot method with ten neutral iron lines. Based on the results, local thermodynamic equilibrium was studied. Moreover, calibration curves were presented for samples containing Si, Fe, Cu, Mn, Mg, Ni, Zn and Ti, and the limit of detection of trace elements was calculated based on experimental results.
文献类型: Article
KeyWords Plus: INDUCED PLASMA SPECTROSCOPY; QUANTITATIVE-ANALYSIS; EMISSION-SPECTROSCOPY; IRON-ORE; DIAGNOSTICS; SILICON; ABSORPTION; ABLATION; LIBS; SI
Web of Science 类别: Physics, Multidisciplinary
研究方向: Physics
IDS 号: 606HA
ISSN: 0031-8949
________________________________________
第 82 条,共 159 条
标题: Characteristics of the aluminum alloy plasma produced by a 1064 nm Nd:YAG laser with different irradiances
作者: Luo, WF (Luo, W. F.); Zhao, XX (Zhao, X. X.); Sun, QB (Sun, Q. B.); Gao, CX (Gao, C. X.); Tang, J (Tang, J.); Wang, HJ (Wang, H. J.); Zhao, W (Zhao, W.)
来源出版物: PRAMANA-JOURNAL OF PHYSICS  卷: 74  期: 6  页: 945-959  出版年: JUN 2010 
Web of Science 核心合集中的 "被引频次": 6
被引频次合计: 6
摘要: The plasma generated by 1064 nm Nd:YAG laser irradiation of aluminum alloy in air at atmospheric pressure was studied spectroscopically. The electron density inferred by measuring the Stark-broadened line profile of Si(I) 288.16 nm decreases with increasing distance from the target surface. The electron temperature was determined using the Boltzmann plot method with nine strong neutral aluminum lines. Due to the thermal conduction towards the solid target and radiative cooling of the plasma as well as conversion of thermal energy into kinetic energy, the electron temperature decreases both at the plasma edge and close to the target surface. Electron density and electron temperature were also studied as functions of laser power density. At the same time, the validity of the assumption of local thermodynamic equilibrium and the effect of self-absorption were discussed in light of the results obtained.
文献类型: Article
作者关键词: Atomic emission spectroscopy; laser-induced breakdown spectroscopy; plasma
KeyWords Plus: INDUCED BREAKDOWN SPECTROSCOPY; ND-YAG LASER; 3RD HARMONICS; ELECTRON-DENSITY; ABLATION; SAMPLES; PRESSURE; EMISSION; 2ND; IDENTIFICATION
Web of Science 类别: Physics, Multidisciplinary
研究方向: Physics
IDS 号: 615BN
ISSN: 0304-4289
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第 83 条,共 159 条
标题: Mid-Infrared Emission and Multiphonon Relaxation in Tm3+-Doped Ge-Ga-Se Glasses
作者: Zhang, PJ (Zhang Peng-jun); Dai, SX (Dai Shi-xun); Le, FD (Le Fang-da); Peng, B (Peng Bo); Xu, TF (Xu Tie-feng); Nie, QH (Nie Qiu-hua); Zhang, XH (Zhang Xiang-hua)
来源出版物: SPECTROSCOPY AND SPECTRAL ANALYSIS  卷: 30  期: 6  页: 1464-1468  DOI: 10.3964/j.issn.1000-0593(2010)06-1464-05  出版年: JUN 2010 
Web of Science 核心合集中的 "被引频次": 1
被引频次合计: 3
摘要: A series of chalcogenide glasses based on the composition Ge30Ga5Se65 (at. %) doped with the different Tm3+ ions were synthesized by melt-quenching technique. The refractive indexes, Raman spectra, absorption spectra, near-and mid-infrared fluorescence, and lifetimes of glass samples under 800 nm laser excitation were measured. The intensity parameters Omega(i)(i=2, 4, 6), transition probabilities, branching ratios and radiative lifetimes have been predicted for Tm3+ ions in samples by using the Judd-Ofelt theory. The near-infrared emission spectra at 1.23, 1.48 and 1.8 mu m were observed and their quantum efficiencies were evaluated respectively in glass doped with 1 Wt% Tm3+-ions under 800 nm excitation. The mid-infrared fluorescence spectra were investigated with the different Tm3+ ion concentration under 800 nm excitation. The multiphonon relaxation rate of Tm3+: 3H5 -> F-3(4) by the measured and calculated lifetimes, and the relative parameters of W(0) and alpha in Ge30Ga5Se65 glass were evaluated. Results show that the multiphonon relaxation rates were significantly lower than other glasses due to the lower maximum phonon energy, so the selenide glasses are promising as host materials for doping by rare earth ions and for preparation of mid-infrared optical elements.
文献类型: Article
作者关键词: Chalcogenide glass; Mid-infrared luminescence; Tm3+-doped; Multiphonon relaxation
KeyWords Plus: RARE-EARTH IONS; OPTICAL-PROPERTIES; MU-M; INTENSITIES
Web of Science 类别: Spectroscopy
研究方向: Spectroscopy
IDS 号: 608JP
ISSN: 1000-0593
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第 84 条,共 159 条
标题: Comparison of Correction Methods for Nonlinear Optic Path Difference of Reflecting Rotating Fourier Transform Spectrometer
作者: Jing, JJ (Jing Juan-juan); Zhou, JS (Zhou Jin-song); Xiangli, B (Xiangli Bin); Lu, QB (Lue Qun-bo); Wei, RY (Wei Ru-yi)
来源出版物: SPECTROSCOPY AND SPECTRAL ANALYSIS  卷: 30  期: 6  页: 1678-1682  DOI: 10.3964/j.issn.1000-0593(2010)06-1678-05  出版年: JUN 2010 
Web of Science 核心合集中的 "被引频次": 2
被引频次合计: 5
摘要: The principle of reflecting rotating Fourier transform spectrometer was introduced in the present paper. The nonlinear problem of optical path difference (OPD) of rotating Fourier transform spectrometer universally exists, produced by the rotation of rotating mirror. The nonlinear OPD will lead to fictitious recovery spectrum, so it is necessary to compensate the nonlinear OPD. Three methods of correction for the nonlinear OPD were described and compared in this paper, namely NUFFT method, OPD replace method and interferograms fitting method. The result indicates that NUFFT was the best method for the compensation of nonlinear OPD, OPD replace method was better, its precision was almost the same as NUFFT method, and their relative error are superior to 0.13%, but the computation efficiency of OPD replace method is slower than NUFFT method, while the precision and computation efficiency of interferograms fitting method are not so satisfied, because the interferograms are rapid fluctuant especially around the zero optical path difference, so it is unsuitable for polynomial fitting, and because this method needs piecewise fitting, its computation efficiency is the slowest, thus the NUFFT method is the most suited method for the nonlinear OPD compensation of reflecting rotating Fourier transform spectrometer.
文献类型: Article
作者关键词: Spectrometer; Rotating mirror; Optical path difference(OPD); Nonlinear sample
Web of Science 类别: Spectroscopy
研究方向: Spectroscopy
IDS 号: 608JP
ISSN: 1000-0593
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第 85 条,共 159 条
标题: Techniques for Pixel Response Nonuniformity Correction of CCD in Interferential Imaging Spectrometer
作者: Yao, T (Yao Tao); Yin, SM (Yin Shi-min); Xiangli, B (Xiangli Bin); Lu, QB (Lue Qun-bo)
来源出版物: SPECTROSCOPY AND SPECTRAL ANALYSIS  卷: 30  期: 6  页: 1712-1716  DOI: 10.3964/j.issn.1000-0593(2010)06-1712-05  出版年: JUN 2010 
Web of Science 核心合集中的 "被引频次": 2
被引频次合计: 3
摘要: Based on in-depth analysis of the relative radiation scaling theorem and acquired scaling data of pixel response nonuniformity correction of CCD (charge-coupled device) in spaceborne visible interferential imaging spectrometer, a pixel response nonuniformity correction method of CCD adapted to visible and infrared interferential imaging spectrometer system was studied out, and it availably resolved the engineering technical problem of nonuniformity correction in detector arrays for interferential imaging spectrometer system. The quantitative impact of CCD nonuniformity on interferogram correction and recovery spectrum accuracy was given simultaneously. Furthermore, an improved method with calibration and nonuniformity correction done after the instrument is successfully assembled was proposed. The method can save time and manpower. It can correct nonuniformity caused by other reasons in spectrometer system besides CCD itself's nonuniformity, can acquire recalibration data when working environment is changed, and can also more effectively improve the nonuniformity calibration accuracy of interferential imaging spectrometer system.
文献类型: Article
作者关键词: Interferential imaging spectrometer; Pixel response; Two-point calibration; Nonuniformity correction
KeyWords Plus: FOCAL-PLANE ARRAYS; CORRECTABILITY; COMPENSATION
Web of Science 类别: Spectroscopy
研究方向: Spectroscopy
IDS 号: 608JP
ISSN: 1000-0593
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第 86 条,共 159 条
标题: Simple approach to picosecond pulse generation based on semiconductor optical amplifier
作者: Yan, SY (Yan, S. Y.); Zhao, W (Zhao, W.); Xie, XP (Xie, X. P.); Lu, HQ (Lu, H. Q.)
来源出版物: ELECTRONICS LETTERS  卷: 46  期: 10  页: 703-U60  DOI: 10.1049/el.2010.0313  出版年: MAY 13 2010 
Web of Science 核心合集中的 "被引频次": 1
被引频次合计: 1
摘要: A simple optical pulse generator based on a semiconductor optical amplifier (SOA) is demonstrated with an easy-generated external optical pulse sequence. Using the cross-gain modulation and self-phase modulation effects inside an SOA, the simple optical pulse generator generates a 10 GHz 3.8 ps optical pulse train with an extremely low timing jitter of 60 fs.
文献类型: Article
KeyWords Plus: LASER
Web of Science 类别: Engineering, Electrical & Electronic
研究方向: Engineering
IDS 号: 614WR
ISSN: 0013-5194
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第 87 条,共 159 条
标题: Transitional and steady mode-locking evolution of dissipative solitons
作者: Wang, LR (Wang, Leiran); Liu, XM (Liu, Xueming); Gong, YK (Gong, Yongkang); Mao, D (Mao, Dong); Li, XH (Li, Xiaohui)
来源出版物: APPLIED OPTICS  卷: 49  期: 14  页: 2665-2669  DOI: 10.1364/AO.49.002665  出版年: MAY 10 2010 
Web of Science 核心合集中的 "被引频次": 9
被引频次合计: 9
摘要: We have experimentally observed the transitional and steady mode-locking (ML) evolution of dissipative solitons (DSs). It is found that pulses with different energies can coexist in the cavity during the evolution. When an additional pulse is generated from the laser, it initially exhibits weak intensity, and then gradually develops into the fully grown pulse with the increase of pump power. Meanwhile, the spectral profile of pulses is modulated at its top. The dynamic processes occur stage by stage, and can be regarded as the transitional states between the two nearby steady ML states. To our best knowledge, this is the first report on experimental observations for the detailed dynamic evolutions of pulse shaping in a DS laser. (C) 2010 Optical Society of America
文献类型: Article
KeyWords Plus: YB-DOPED FIBER; NORMAL-CAVITY-DISPERSION; HYSTERESIS PHENOMENA; LASERS; MULTISTABILITY; INSTABILITY
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 593RC
ISSN: 1559-128X
电子 ISSN: 2155-3165
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标题: One-spot and multispot processing for supermode stabilization
作者: Cai, R (Cai, Ran); Xue, C (Xue, Cai); Zeng, L (Zeng, Lan); Chen, JG (Chen, Jianguo); Cai, GS (Cai, Guishun); Hu, SJ (Hu, Shijie); Cao, JE (Cao, Jie); Rong, J (Rong, Jian); Dong, JH (Dong, Jihui)
来源出版物: APPLIED OPTICS  卷: 49  期: 14  页: 2703-2711  DOI: 10.1364/AO.49.002703  出版年: MAY 10 2010 
Web of Science 核心合集中的 "被引频次": 0
被引频次合计: 0
摘要: Through employing an external mirror that is tilted by an angle beta = lambda/2d in the external cavity, whose round-trip cavity length is one-half a Talbot distance, a laser diode array (LDA) is made to oscillate with only an in-phase supermode. This makes the far-field distribution of the LDA have a central-single-lobe far-field pattern, and it also makes the output from the LDA be nearly diffraction limited. However, if the phase-locked output energy from the LDA is extremely high, then the thermal radiation from the output deforms the external mirror stochastically. This makes the tilt angle (beta) mismatched to the in-phase supermode, which results in undesirable supermode oscillations; so the far-field distribution of the LDA is no longer a central-single-lobe far-field pattern. Naturally, the intensity of the output from the LDA is attenuated, and the divergence loss is worsened. Therefore, suitable measures must be taken to guarantee the quality of the phase-locked output from the LDA. Accordingly, after analysis of the deformation of the external mirror, a novel one-spot and multispot processing (OMP) technology is developed. With special sensors, deformation of the external mirror is ascertained as a function of time. Then the deformation is compensated by appropriate equipment, which counteracts any bad influence on the angle beta. The experiment significantly demonstrates that only the in-phase supermode oscillated in an extremely high-energy LDA after the implementation of OMP, allowing such lasers to satisfy the requirements of high-quality laser applications. (C) 2010 Optical Society of America
文献类型: Article
KeyWords Plus: LASER-DIODE ARRAY; EXTERNAL-CAVITY TECHNIQUE; FINITE-THICKNESS MEDIA; PHASE-LOCKED ARRAYS; TEMPERATURE DISTRIBUTIONS; BEAM DIVERGENCE; POWER; LOCKING; SEMIINFINITE; ABSORPTION
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 593RC
ISSN: 1559-128X
电子 ISSN: 2155-3165
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第 89 条,共 159 条
标题: Characterization and mechanism studies of dielectric barrier discharges generated at atmospheric pressure
作者: Tang, J (Tang, Jie); Duan, YX (Duan, Yixiang); Zhao, W (Zhao, Wei)
来源出版物: APPLIED PHYSICS LETTERS  卷: 96  期: 19  文献号: 191503  DOI: 10.1063/1.3430008  出版年: MAY 10 2010 
Web of Science 核心合集中的 "被引频次": 16
被引频次合计: 18
摘要: A dielectric barrier discharge (DBD) device operated at ambient air with an ac power supply was designed and examined. The discharge power and active current of DBD were characterized. Experimental results show that the discharge power does not proportionally increase all along with voltage. Through in-depth analysis of typical waveforms of instantaneous applied voltage and discharge current, and images of microdischarges in the gas gap, it is inferred that considerable reduction in charges transferred through discharge channels is most likely due to recombination and attachment to electronegative molecules, nonuniform highly distorted electric fields, and repulse of more homogeneous electric charges. (C) 2010 American Institute of Physics. [doi:10.1063/1.3430008]
文献类型: Article
作者关键词: atmospheric pressure; discharges (electric); plasma devices
KeyWords Plus: GLOW-DISCHARGE; AIR; DYNAMICS; HELIUM; CORONA
Web of Science 类别: Physics, Applied
研究方向: Physics
IDS 号: 597KR
ISSN: 0003-6951
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第 90 条,共 159 条
标题: Design and characteristics of novel optical polymer Topas COC-based microstructured optical fiber
作者: Wang, DD (Wang Dou-Dou); Wang, LL (Wang Li-Li)
来源出版物: ACTA PHYSICA SINICA  卷: 59  期: 5  页: 3255-3259  出版年: MAY 2010 
Web of Science 核心合集中的 "被引频次": 3
被引频次合计: 6
摘要: Four kinds of microstructured polymer optical fibers based on Topas cyclic olefin copolymer(COC) are designed. The effective index of the fundamental mode, the mode area and the numerical aperture are calculated by using the finite element method. Effects of structure parameters upon the mode field distribution, single mode property and dispersion property are discussed. Structure parameters corresponding to very large or very small effective mode area, endless single mode operation and flattened-near-zero dispersion are obtained. These fibers have larger numerical apertures compared with silica or PMMA based ones, and display flattened-near-zero dispersion.
文献类型: Article
作者关键词: microstructured polymer optical fiber; finite element method; propagation characteristics; Topas COC
KeyWords Plus: PHOTONIC CRYSTAL FIBERS; AIR HOLES; FABRICATION; ARRAY
Web of Science 类别: Physics, Multidisciplinary
研究方向: Physics
IDS 号: 597CO
ISSN: 1000-3290
________________________________________
第 91 条,共 159 条
标题: Mid-infrared emission properties of Dy3+ -doped Ge-Ga-S-Csl glasses
作者: Dai, SX (Dai Shi-Xun); Peng, B (Peng Bo); Le, FD (Le Fang-Da); Wang, XS (Wang Xun-Si); Shen, X (Shen Xiang); Xu, TF (Xu Tie-Feng); Nie, QH (Nie Qiu-Huan)
来源出版物: ACTA PHYSICA SINICA  卷: 59  期: 5  页: 3547-3553  出版年: MAY 2010 
Web of Science 核心合集中的 "被引频次": 3
被引频次合计: 5
摘要: A series of chalcogenide glasses based on Ge-Ga-S-CsI system doped with different Dy3+ ions were synthesized by melt-quenching technique. The refractive indices, Raman spectra, absorption spectra, near-and mid-infrared fluorescence of glass samples were measured. The intensity parameters (Omega(i), i = 2,4,6), transition probabilities (A), branching ratios (beta) and radiation lifetimes (tau(tad)) have been predicted for Dy3+ ions in the samples by using the Judd-Ofelt theory. The mid-infrared fluorescence properties were investigated for different Dy3* ion concentrations under 810 nm laser excitation. The multiphonon relaxation rates (W-mp) of Dy3+ : H-13/2 -> H-6(15/2) (2. 86 mu m) and (6)H11/2 -> H-6(13/2) (4.38 mu m), and the constant related to the e-p coupling strength (alpha) of Ge-Ga-S-CsI glasses were evaluated.
文献类型: Article
作者关键词: chalcogenide glass; mid-infrared luminescence; Dy3+-doped; multiphonon relaxation
KeyWords Plus: RARE-EARTH IONS; SPECTROSCOPIC PROPERTIES; OPTICAL-PROPERTIES; INTENSITIES; ABSORPTION
Web of Science 类别: Physics, Multidisciplinary
研究方向: Physics
IDS 号: 597CO
ISSN: 1000-3290
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第 92 条,共 159 条
标题: Fluorescence Hydrogen Peroxide Probe Based on a Microstructured Polymer Optical Fiber Modified with a Titanium Dioxide Film
作者: Li, DD (Li, Dongdong); Wang, LL (Wang, Lili)
来源出版物: APPLIED SPECTROSCOPY  卷: 64  期: 5  页: 514-519  出版年: MAY 2010 
Web of Science 核心合集中的 "被引频次": 11
被引频次合计: 12
摘要: A highly sensitive microstructured polymer optical fiber (MPOF) probe for hydrogen peroxide was made by forming a rhodamine 6G-doped titanium dioxide film on the side walls of array holes in an MPOF. It was found that hydrogen peroxide only has a response to the MPOF probe in a certain concentration of potassium iodide in sulfuric acid solution. The calibration graph of fluorescence intensity versus hydrogen peroxide concentration is linear in the range of 1.6 x 10(-7) mol/L to 9.6 x 10(-5) mol/L. The method, with high sensitivity and a wide linear range, has been applied to the determination of trace amounts of hydrogen peroxide in a few real samples, such as rain water and contact lens disinfectant, with satisfactory results.
PubMed ID: 20482970
文献类型: Article
作者关键词: Hydrogen peroxide; Fluorescence probe; Microstructured polymer optical fiber; Titanium oxide film
KeyWords Plus: PHOTONIC CRYSTAL FIBERS; THIN-FILMS; HORSERADISH-PEROXIDASE; SENSORS; FABRICATION; BIOSENSOR; OXIDASE; WATER
Web of Science 类别: Instruments & Instrumentation; Spectroscopy
研究方向: Instruments & Instrumentation; Spectroscopy
IDS 号: 598OD
ISSN: 0003-7028
________________________________________
第 93 条,共 159 条
标题: A Single Photon Counting Detector Based on One-Dimensional Vernier Anode
作者: Yang, H (Yang Hao); Zhao, BS (Zhao Bao-Sheng); Sheng, LZ (Sheng Li-Zhi); Li, M (Li Mei); Yan, QR (Yan Qiu-Rong); Liu, YA (Liu Yong-An)
来源出版物: CHINESE PHYSICS LETTERS  卷: 27  期: 5  文献号: 058501  DOI: 10.1088/0256-307X/27/5/058501  出版年: MAY 2010 
Web of Science 核心合集中的 "被引频次": 4
被引频次合计: 4
摘要: The mathematical expression on decoding the one-dimensional (1D) Vernier anode is deduced theoretically, and the corresponding 1D-Vernier anode collector is developed. A photon counting imaging and detection system is constructed based on a 1D-Vernier anode detector and electronic readout subsystem. With wavelengths of 253.7 nm from the mercury lamp as the ultraviolet emission source, the spatial resolution of the prototype is proved to be better than 100 mu m along the x-direction in experiment.
文献类型: Article
KeyWords Plus: IMAGING-SYSTEM; RESOLUTION
Web of Science 类别: Physics, Multidisciplinary
研究方向: Physics
IDS 号: 591ZS
ISSN: 0256-307X
________________________________________
第 94 条,共 159 条
标题: Geometric Distortion Insensitive Image Watermarking in Affine Covariant Regions
作者: Gao, XB (Gao, Xinbo); Deng, C (Deng, Cheng); Li, XL (Li, Xuelong); Tao, DC (Tao, Dacheng)
来源出版物: IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS PART C-APPLICATIONS AND REVIEWS  卷: 40  期: 3  页: 278-286  DOI: 10.1109/TSMCC.2009.2037512  出版年: MAY 2010 
Web of Science 核心合集中的 "被引频次": 42
被引频次合计: 44
摘要: Feature-based image watermarking schemes, which aim to survive various geometric distortions, have attracted great attention in recent years. Existing schemes have shown robustness against rotation, scaling, and translation, but few are resistant to cropping, nonisotropic scaling, random bending attacks (RBAs), and affine transformations. Seo and Yoo present a geometrically invariant image watermarking based on affine covariant regions (ACRs) that provide a certain degree of robustness. To further enhance the robustness, we propose a new image watermarking scheme on the basis of Seo's work, which is insensitive to geometric distortions as well as common image processing operations. Our scheme is mainly composed of three components: 1) feature selection procedure based on graph theoretical clustering algorithm is applied to obtain a set of stable and nonoverlapped ACRs; 2) for each chosen ACR, local normalization, and orientation alignment are performed to generate a geometrically invariant region, which can obviously improve the robustness of the proposed watermarking scheme; and 3) in order to prevent the degradation in image quality caused by the normalization and inverse normalization, indirect inverse normalization is adopted to achieve a good compromise between the imperceptibility and robustness. Experiments are carried out on an image set of 100 images collected from Internet, and the preliminary results demonstrate that the developed method improves the performance over some representative image watermarking approaches in terms of robustness.
文献类型: Article
作者关键词: Affine covariant region (ACR); dominant gradient; image normalization; image watermarking; orientation alignment
KeyWords Plus: SCALE-SPACE REPRESENTATION; GENETIC WATERMARKING; FEATURE POINTS; DETECTORS; RETRIEVAL; SCHEME
Web of Science 类别: Computer Science, Artificial Intelligence; Computer Science, Cybernetics; Computer Science, Interdisciplinary Applications
研究方向: Computer Science
IDS 号: 583NI
ISSN: 1094-6977
________________________________________
第 95 条,共 159 条
标题: Mid-infrared Emission Properties of Ho3+-doped Ge-Ga-S-CsI Glasses
作者: Zhu, J (Zhu Jun); Dai, SX (Dai Shi-Xun); Peng, B (Peng Bo); Xu, TF (Xu Tie-Feng); Wang, XS (Wang Xun-Si); Zhang, XH (Zhang Xiang-Hua)
来源出版物: JOURNAL OF INORGANIC MATERIALS  卷: 25  期: 5  页: 546-550  DOI: 10.3724/SP.J.1077.2010.00546  出版年: MAY 2010 
Web of Science 核心合集中的 "被引频次": 3
被引频次合计: 4
摘要: A serial of chalcogenide glasses based on Ge-Ga-S-Csl system doped with the different Ho3+ ions were synthesized by melt-quenching technique. The properties of glasses including refractive indexes, absorption spectra, mid-infrared emission spectra and lifetimes of I-5(6) level of Ho3+ ions were measured. The Judd-Ofelt intensity parameters Omega(i)(i=2,4,6), oscillator strength f(cal), spontaneous transition probabilities A(rad) for Ho3+ ion were calculated by Judd-Ofelt theory. Multiphonon relaxation rates of the Ho3+ : I-5(5)-> I-5(6) and I-5(6)-> I-5(7) in Ge-Ga-S-Csl glasses were evaluated. Effect of Ho3+ ion concentration on the fluorescence spectra was investigated. The results indicate that the fluorescence under 900 nm excitation with peak wavelength at 2. 81 mu m and 3. 86 mu m are due to the Ho3+ : I-5(6)-> I-5(6) and I-5(6)-> I-5(7) transition, respectively. The intensity of the mid-infrared fluorescence are enhanced with the Ho3+ ion concentration increasing from 0. 5wt% to 1. 0wt%. Multiphonon relaxation rates are 29s(-1) and 34s(-1) for the Ho3+ : I-5(5)-> I-5(6) and I-5(6)-> I-5(7) transition, respectively.
文献类型: Article
作者关键词: mid-infrared luminescence; chalcogenide glass; Ho3+ -ion
KeyWords Plus: RARE-EARTH IONS; CHALCOHALIDE GLASSES; OPTICAL-PROPERTIES; ENERGY-TRANSFER; SULFIDE GLASS; UP-CONVERSION; SPECTROSCOPY; CHALCOGENIDE; INTENSITIES; HOLMIUM
Web of Science 类别: Materials Science, Ceramics
研究方向: Materials Science
IDS 号: 599XV
ISSN: 1000-324X
________________________________________
第 96 条,共 159 条
标题: Optimization of supercontinuum generation in air-silica nanowires
作者: Lu, H (Lu, Hua); Liu, XM (Liu, Xueming); Gong, YK (Gong, Yongkang); Hu, XH (Hu, Xiaohong); Li, XH (Li, Xiaohui)
来源出版物: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS  卷: 27  期: 5  页: 904-908  出版年: MAY 2010 
Web of Science 核心合集中的 "被引频次": 8
被引频次合计: 8
摘要: An effective hybrid genetic algorithm (GA) for optimizing air-silica nanowires, the incident pulse, and supercontinuum (SC) generation, is proposed in this paper. Based on the proposed algorithm, the dispersion and nonlinearity of air-silica nanowires, as well as the duration and chirp of incident pulses, are optimized to achieve SC generation with a broader, smoother, and more intense spectrum. It is found that the optimized spectrum becomes smoother from 740 to 1500 nm and is broadened by 300 nm. Meanwhile, the spectral intensity in the range of 450-945 nm is significantly increased by a factor of 10. (C) 2010 Optical Society of America
文献类型: Article
KeyWords Plus: PHOTONIC-CRYSTAL FIBERS; MICROSTRUCTURE OPTICAL-FIBERS; SUBWAVELENGTH-DIAMETER SILICA; CONTINUUM GENERATION; PHASE MODULATION; WAVE-GUIDES; DISPERSION; COMPRESSION
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 590QF
ISSN: 0740-3224
________________________________________
第 97 条,共 159 条
标题: Pulse evolution without wave breaking in a strongly dissipative-dispersive laser system
作者: Liu, XM (Liu, Xueming)
来源出版物: PHYSICAL REVIEW A  卷: 81  期: 5  文献号: 053819  DOI: 10.1103/PhysRevA.81.053819  出版年: MAY 2010 
Web of Science 核心合集中的 "被引频次": 57
被引频次合计: 60
摘要: We report on pulse evolution without wave breaking in a strongly dissipative-dispersive laser system where pulses encounter significant amounts of positive and negative dispersions. In contrast to conventional soliton, dispersion-managed soliton, and self-similar pulse evolutions, a different type of pulse shaping in mode-locked lasers is theoretically investigated and experimentally observed. The pulses of this laser have very low frequency chirp and exhibit as the quasirectangle temporal and Gaussian spectral profiles, and the spectral width is almost independent of the pumping strength. The temporal and spectral widths fluctuate as low as similar to 3% of the relative fluctuation throughout the laser cavity. Both numerical and experimental results show that the pulses exist with energies much greater than can be tolerated in self-similar pulse shaping.
文献类型: Article
KeyWords Plus: FEMTOSECOND FIBER LASERS; NORMAL-CAVITY-DISPERSION; DOPED FIBER; ENERGY; SOLITONS; COMPENSATION; PROPAGATION; GENERATION; AMPLIFIERS; EQUATION
Web of Science 类别: Optics; Physics, Atomic, Molecular & Chemical
研究方向: Optics; Physics
IDS 号: 602LF
ISSN: 1050-2947
________________________________________
第 98 条,共 159 条
标题: Comparison of Two Types of Fourier Transform Imaging Spectrometry
作者: Xiangli, B (Xiangli Bin); Lu, QB (Lue Qun-bo); Huang, M (Huang Min); Yao, T (Yao Tao)
来源出版物: SPECTROSCOPY AND SPECTRAL ANALYSIS  卷: 30  期: 5  页: 1422-1426  DOI: 10.3964/j.issn.1000-0593(2010)05-1422-05  出版年: MAY 2010 
Web of Science 核心合集中的 "被引频次": 0
被引频次合计: 0
摘要: The comparison between "large aperture static imaging spectrometry (LASTS)" designed by author and "method for simultaneously measuring the spectral intensity as a function of wavelength of all the pixels of a two dimensional scene" (MSMSI) designed by Israeli researchers is given. The difference of the interferometers and imaging systems in LASIS and MSMSI is discussed. The nonlinear curve of optical path difference of MSMSI is simulated. Inspired by the operation of MSMSI, the time modulated Fourier transform imaging spectrometry based on lateral shearing interferometer was presented. The optical path differences of different field of view were given under the condition of regularly rotating the lateral shearing interferometer.
文献类型: Article
作者关键词: Fourier transform imaging spectrometer; Sagnac interferometer; Optical path difference
Web of Science 类别: Spectroscopy
研究方向: Spectroscopy
IDS 号: 590VK
ISSN: 1000-0593
________________________________________
第 99 条,共 159 条
标题: Spectrum Recovery Methods for Nonuniform Sampling Interferogram
作者: Yao, T (Yao Tao); Lu, QB (Lue Qun-bo); Xiangli, B (Xiangli Bin); Yuan, Y (Yuan Yan)
来源出版物: SPECTROSCOPY AND SPECTRAL ANALYSIS  卷: 30  期: 5  页: 1430-1433  DOI: 10.3964/j.issn.1000-0593(2010)05-1430-04  出版年: MAY 2010 
Web of Science 核心合集中的 "被引频次": 0
被引频次合计: 1
摘要: The interferogram acquired by imaging Fourier transform spectrometer (IFTS) can't be used directly and must be recovered. The spectrum recovery processes based on fast Fourier transform (FFT) is the traditional method which is used widely. For some IFTS, the nonuniform sampling of the interferogram is often occurrs. When the aliasing is neglected, the spectrum recovered by traditional method is often distorted. When the spectrum recovery processes based on Fourier transform are used, the precision of the recovered spectrum can be ensured, but the real-time processing requirement can't be satisfied. In order to acquire the precise recovered spectrum of the nonuniform sampled interferogram, the interpolation method and nonuniform fast Fourier transform (NUFFT) method were adopted. For the oversampled interferogram and partial undersampled interferogram. the spectrum recovery methods based on interpolation and NUFFT were presented respectively, and the applicability of these two methods is given. Finally, the computer simulation was performed, and the results indicate that NUFFT method is preferable to interpolation method not for undersampled interferogram but for oversampled interferogram.
文献类型: Article
作者关键词: Interferogram; Nonuniform sampling; Spectrum recovery; Interpolation; Spectral aliasing
Web of Science 类别: Spectroscopy
研究方向: Spectroscopy
IDS 号: 590VK
ISSN: 1000-0593
________________________________________
第 100 条,共 159 条
标题: Compact all-fiber high-energy fiber laser with sub-300-fs duration
作者: Liu, XM (Liu, X. M.); Mao, D (Mao, D.)
来源出版物: OPTICS EXPRESS  卷: 18  期: 9  页: 8847-8852  DOI: 10.1364/OE.18.008847  出版年: APR 26 2010 
Web of Science 核心合集中的 "被引频次": 35
被引频次合计: 36
摘要: We report a compact all-fiber high-energy fiber laser that consists of a laser oscillator and a compression section. The laser oscillator generates the pulses with high energy and large chirp. The compression section is made of a piece of standard single-mode fiber that dechirps the chirped pulses. The compact all-fiber fiber laser produces pulses with 8 nJ of the pulse energy and 290 fs of the pulse duration. (C) 2010 Optical Society of America
PubMed ID: 20588729
文献类型: Article
KeyWords Plus: NORMAL-DISPERSION; DISSIPATIVE-SOLITON; HIGH-POWER; FEMTOSECOND PULSES; MODE; OSCILLATOR; SYSTEM; NJ
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 588OR
ISSN: 1094-4087


第 101 条,共 159 条
标题: Second-harmonic generation from metal-film nanohole arrays
作者: Lu, H (Lu, Hua); Liu, XM (Liu, Xueming); Zhou, RL (Zhou, Renlong); Gong, YK (Gong, Yongkang); Mao, D (Mao, Dong)
来源出版物: APPLIED OPTICS  卷: 49  期: 12  页: 2347-2351  DOI: 10.1364/AO.49.002347  出版年: APR 20 2010 
Web of Science 核心合集中的 "被引频次": 6
被引频次合计: 6
摘要: The roles of surface plasmon resonance and localized resonances in second-harmonic generation are investigated in a noncentrosymmetrical metallic film with a periodic subwavelength nanohole array. By using a recently developed microscopic classical theory and a three-dimensional finite-difference time-domain algorithm, numerical results show that the second-harmonic intensity is a function of the polarization and wavelength of incident waves. A peak of the second-harmonic intensity is achieved when the incident wave is along the direction perpendicular to the x-axis of nanoholes, which corresponds to the maximal extraordinary optical transmission. Meanwhile, the second harmonic is found to correlate with the group delay of incident waves. (C) 2010 Optical Society of America
PubMed ID: 20411015
文献类型: Article
KeyWords Plus: ELECTRIC-DIPOLE ORIGIN; OPTICAL-TRANSMISSION; SUBWAVELENGTH HOLE; APERTURES; LIGHT
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 586OD
ISSN: 1559-128X
电子 ISSN: 2155-3165
________________________________________
第 102 条,共 159 条
标题: Influence of annealing temperature on the performance of Ge film and photon-counting imaging system
作者: Zhao, FF (Zhao, Feifei); Zhao, BS (Zhao, Baosheng); Sai, XF (Sai, Xiaofeng); Zhang, XH (Zhang, Xinghua); Wei, YL (Wei, Yonglin); Zou, W (Zou, Wei)
来源出版物: CHINESE OPTICS LETTERS  卷: 8  期: 4  页: 361-364  DOI: 10.3788/COL20100804.0361  出版年: APR 10 2010 
Web of Science 核心合集中的 "被引频次": 1
被引频次合计: 4
摘要: Compared with the traditional image intensifier with phosphor screen readout, the photon-counting imaging detector with charge induction readout is more beneficial in several aspects (e.g., good imaging properties and time resolution) to astronomy, reconnaissance, bioluminescence, and materials research. However, the annealing temperature during the tube-making process can affect the properties of the Ge film, and consequently impair the performance of the detector. Therefore, the influence of annealing temperature on Ge film and on the detector is studied in order to determine the crucial parameters. The Ge films are prepared on ceramic and quartz glass by the use of an electron gun. They are analyzed by scanning electron microscope (SEM), high-resistance meter, and X-ray diffraction (XRD). The results show that the optimum substrate and annealing temperature are ceramic plate and 250 degrees C, respectively.
文献类型: Article
KeyWords Plus: READ-OUT; POSITION; DETECTORS; PARTICLE; ANODES; WEDGE; EBCCD
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 586WO
ISSN: 1671-7694
________________________________________
第 103 条,共 159 条
标题: Experimental study on high power all-fiber laser
作者: Zhao, BY (Zhao, Baoyin); Duan, KL (Duan, Kailang); Zhao, W (Zhao, Wei); Li, C (Li, Cheng); Wang, YS (Wang, Yishan)
来源出版物: CHINESE OPTICS LETTERS  卷: 8  期: 4  页: 404-406  DOI: 10.3788/COL20100804.0404  出版年: APR 10 2010 
Web of Science 核心合集中的 "被引频次": 8
被引频次合计: 9
摘要: A high power all-fiber laser is experimentally studied. A monolithic fiber laser system with only one stage of resonator cavity is constructed and 404-W continuous wave (CW) output power is obtained. Its optical-to-optical conversion efficiency is up to 64%. The laser central wavelength is at 1081 nm with the spectral full-width at half-maximum (FWHM) of 2 nm. The laser setup can work with excellent stability; in the long time of high power operation, no thermal distortions or damages are observed.
文献类型: Article
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 586WO
ISSN: 1671-7694
________________________________________
第 104 条,共 159 条
标题: Nd3+-doped LaF3 nanoparticles with a larger emission cross-section
作者: Cui, XX (Cui, Xiaoxia); She, JB (She, Jiangbo); Cui, K (Cui, Kai); Gao, C (Gao, Chao); Hou, CQ (Hou, Chaoqi); Wei, W (Wei, Wei); Peng, B (Peng, Bo)
来源出版物: CHEMICAL PHYSICS LETTERS  卷: 489  期: 4-6  页: 191-194  DOI: 10.1016/j.cplett.2010.02.066  出版年: APR 9 2010 
Web of Science 核心合集中的 "被引频次": 7
被引频次合计: 7
摘要: A series of Nd3+-doped LaF3 nanoparticles with Nd3+ concentrations from 0.5 to 10 mol% were synthesized. The fluorescence intensity and lifetime of the nanoparticles at various Nd3+ doping concentration were investigated. The nanoparticles displayed strongest fluorescence intensity at 3 mol% Nd3+ concentration. Eighty-eight percentage quantum efficiency was obtained when the Nd3+ concentration was 0.5 mol%. Optical properties of nanoparticles were studied according to Judd-Ofelt theory. A larger emission cross-section, sigma(em), for F-4(3/2) -> I-4(11/2) transition of the Nd3+ ion was obtained as 3.21 x 10(-20) cm(2), which was two times of the currently reported value. The larger emission cross-section and strong fluorescence intensity demonstrate that these nanoparticles are promising materials for laser applications. (C) 2010 Published by Elsevier B. V.
文献类型: Article
KeyWords Plus: ND3+ IONS; OPTICAL-PROPERTIES; GLASS-CERAMICS; WHITE-LIGHT; NANOCRYSTALS; FLUORESCENCE
Web of Science 类别: Chemistry, Physical; Physics, Atomic, Molecular & Chemical
研究方向: Chemistry; Physics
IDS 号: 577AA
ISSN: 0009-2614
电子 ISSN: 1873-4448
________________________________________
第 105 条,共 159 条
标题: Temperature dependence of field emission of nano-diamond
作者: Yang, YN (Yang Yan-Ning); Zhang, ZY (Zhang Zhi-Yong); Zhang, FC (Zhang Fu-Chun); Zhang, WH (Zhang Wei-Hu); Yan, JF (Yan Jun-Feng); Zhai, CX (Zhai Chun-Xue)
来源出版物: ACTA PHYSICA SINICA  卷: 59  期: 4  页: 2666-2671  出版年: APR 2010 
Web of Science 核心合集中的 "被引频次": 0
被引频次合计: 0
摘要: The field emission characteristics of nano-diamond deposited on titanium substrate at various temperatures are studied It was found that the emission current increases with increase of temperature and electric field,while the stability of the emission current has does not change. The field emission characteristic deviates from classic Fowler-Nordheim theory. The mechanism of the emission current at different temperatures is analyzed It may be due to the combined RC lion of scale effect of the nano-diamond and masses of hot carrier produced by nano-diamonds in external electric field. In addition,the research indicates that larger current can be generated after titanium substrates being heated up to a certain degree in external electric field, which can have large effect on field emission, showing that the titanium substrate has a certain degree of temperature sensitivity and voltage sensitivity.
文献类型: Article
作者关键词: field emission; nano-diamond; scale effect; hot carrier
KeyWords Plus: ELECTRON-EMISSION; PROPERTY; SURFACE; FILM
Web of Science 类别: Physics, Multidisciplinary
研究方向: Physics
IDS 号: 587AE
ISSN: 1000-3290
________________________________________
第 106 条,共 159 条
标题: A Technology to Generate Fast-Edge Pulses Using Step Recovery Diode
作者: Gou, YS (Gou Yongsheng); Liu, BY (Liu Baiyu); Bai, YL (Bai Yonglin); Ouyang, X (Ouyang Xian); Zhang, W (Zhang Wei); Li, Y (Li Yan); Xue, YD (Xue Yingdong)
来源出版物: CHINESE JOURNAL OF ELECTRONICS  卷: 19  期: 2  页: 378-380  出版年: APR 2010 
Web of Science 核心合集中的 "被引频次": 0
被引频次合计: 0
摘要: A rectangular pulse generator circuit with fast rising and falling edge will be presented in this paper. The generator circuit was designed by controlling the quantity of carriers in the middle layer from regulating forward current of the SRD (Step recovery diode), and then indirectly controlling the pulse width. It is based on the principle that large reverse current will flow through the diode and last for a relatively long time when it is reverse biased. Experimental results have been analyzed in physical level. They are tallied with theoretical results. The circuit can generate rectangular pulses with rise time about 150ps, fall time about 250ps, amplitude about 10V and pulse width adjustable from ins to 10ns in 50 Omega load. The trig jitter is less than 5ps and the amplitude jitter is better than 4%.
文献类型: Article
作者关键词: Fast rectangular pulse; Fast rising edge; Fast falling edge; Step recovery diode
Web of Science 类别: Engineering, Electrical & Electronic
研究方向: Engineering
IDS 号: 588LG
ISSN: 1022-4653
________________________________________
第 107 条,共 159 条
标题: Dressed Four-Wave Mixing Spectroscopy Modified by Polarization Interference and Atom-Wall Collision in Micrometric Thin Cells
作者: Li, YY (Li Yuan-Yuan); Li-li (Li-li); Bai, JT (Bai Jin-Tao); Li, CB (Li Chang-Biao); Zhang, YP (Zhang Yan-Peng); Hou, X (Hou Xun)
来源出版物: CHINESE PHYSICS LETTERS  卷: 27  期: 4  文献号: 044203  DOI: 10.1088/0256-307X/27/4/044203  出版年: APR 2010 
Web of Science 核心合集中的 "被引频次": 2
被引频次合计: 3
摘要: Dressed four-wave mixing (DFWM) spectroscopy is investigated theoretically in some micrometric thin cells. It is found that DFWM spectra can be modified by polarization interference of atoms and transient effects induced by atom-wall collision. This modification can lead to width-narrowing of DFWM lines and facilitates to implement experiment of high resolution DFWM spectroscopy in a confined atomic system.
文献类型: Article
KeyWords Plus: 2 DIELECTRIC WALLS; BEATS
Web of Science 类别: Physics, Multidisciplinary
研究方向: Physics
IDS 号: 577EC
ISSN: 0256-307X
________________________________________
第 108 条,共 159 条
标题: Prediction of optical modulation properties of twisted-nematic liquid-crystal display by improved measurement of Jones matrix
作者: Ma, BH (Ma, Baiheng); Yao, BL (Yao, Baoli); Ye, T (Ye, Tong); Lei, M (Lei, Ming)
来源出版物: JOURNAL OF APPLIED PHYSICS  卷: 107  期: 7  文献号: 073107  DOI: 10.1063/1.3361238  出版年: APR 1 2010 
Web of Science 核心合集中的 "被引频次": 4
被引频次合计: 4
摘要: The optical modulation properties of twisted-nematic liquid-crystal display (TN-LCD) can be totally predicted and optimized when its Jones matrix is known. An improved method for determining the Jones matrix of the TN-LCD without knowing its internal parameters is presented in this paper. Only three sets of intensity measurements are needed for the complete determination of the TN-LCD's Jones matrix for a single wavelength, much less than the procedure offered by Moreno et al. This method is easier and stable in data processing and capable of diminishing the calculation error resulting from the fluctuation of intensity measurement effectively. The validity of this method is verified experimentally, whose results coincide well with the optical modulation properties of the TN-LCD predicted by our determined Jones matrix. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3361238]
文献类型: Article
KeyWords Plus: PHASE-ONLY MODULATION; POLARIZATION STATES; TELEVISION; DEVICES; TV
Web of Science 类别: Physics, Applied
研究方向: Physics
IDS 号: 585AA
ISSN: 0021-8979
________________________________________
第 109 条,共 159 条
标题: Continuous-wave passively mode-locked Nd:YVO4/KTP green laser with a semiconductor saturable absorber mirror
作者: Wang, X (Wang, X.); Li, M (Li, M.)
来源出版物: LASER PHYSICS  卷: 20  期: 4  页: 733-736  DOI: 10.1134/S1054660X10070297  出版年: APR 2010 
Web of Science 核心合集中的 "被引频次": 29
被引频次合计: 29
摘要: A diode-pumped passively mode-locked low-doped Nd:YVO4 green laser with a semiconductor saturable absorber mirror (SESAM) and an intracavity frequency-doubling KTP crystal is demonstrated. In order to efficiently release the thermal effect, a low-doped Nd:YVO4 crystal with the Nd3+ concentration of 0.1 at % is employed as the gain medium. The maximum average output power of 3.1 W at 532 nm with a repetition rate of 102 MHz is obtained under the pump power of 25 W, corresponding to an optical conversion efficiency of 12.4%. The 532 nm mode locked pulse width is estimated to be approximately 6.1 ps.
文献类型: Article
KeyWords Plus: ND-YVO4 LASER; EFFICIENT; CR4+-YAG; LOCKING
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 584IK
ISSN: 1054-660X
________________________________________
第 110 条,共 159 条
标题: Broad and tunable multiwavelength fiber laser at the assistance of modulation-instability-assisted four-wave mixing
作者: Liu, XM (Liu, X. M.)
来源出版物: LASER PHYSICS  卷: 20  期: 4  页: 842-846  DOI: 10.1134/S1054660X10070194  出版年: APR 2010 
Web of Science 核心合集中的 "被引频次": 27
被引频次合计: 27
摘要: Based on a piece of highly-nonlinear near-zero-dispersion-flattened photonic crystal fiber (PCF), a broadly tunable multiwavelength erbium-doped fiber laser is proposed by using a bi-directionally pumping scheme. This kind of PCF induces the modulation-instability-assisted four-wave mixing to generate new wavelengths. The proposed laser with excellent stability is tunable and switchable by adjusting the fiber Bragg gratings and the variable optical attenuators. The outstanding merits of the proposed multiwavelength laser are the flexible tuning and the ultrabroad spectral range over 150 nm. Especially, the proposed laser source can work at the wavelength of less than 1460 nm, overcoming the limit of gain bandwidth of erbium-doped fiber.
文献类型: Article
KeyWords Plus: ERBIUM-DOPED FIBER; PHOTONIC CRYSTAL FIBER; CROSS-PHASE-MODULATION; RING LASER; BRILLOUIN FIBER; LINEAR CAVITY; SAGNAC LOOP; SEMICONDUCTOR
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 584IK
ISSN: 1054-660X
________________________________________
第 111 条,共 159 条
标题: Evolution of dual-wavelength solitons in an erbium-doped fiber laser
作者: Mao, D (Mao, D.); Liu, XM (Liu, X. M.); Wang, LR (Wang, L. R.); Li, XH (Li, X. H.); Lu, H (Lu, H.); Sun, HB (Sun, H. B.); Gong, YK (Gong, Y. K.)
来源出版物: LASER PHYSICS  卷: 20  期: 4  页: 847-854  DOI: 10.1134/S1054660X10070236  出版年: APR 2010 
Web of Science 核心合集中的 "被引频次": 14
被引频次合计: 14
摘要: We report on experimental observations of dual-wavelength solitons in a passively mode-locked erbium-doped fiber laser. Two kinds of dual-wavelength solitons with different spectrum shapes are achieved. One is exhibited to have spectrum sidebands and the other one is shown to have the smooth profile without any sideband. The mode-locking mechanism at different central wavelengths is analyzed. Experimental results suggest that the pump level together with the cavity filtering effect play key roles in the generation of the dual-wavelength solitons.
文献类型: Article
KeyWords Plus: NONLINEAR POLARIZATION ROTATION; RING LASER; CAVITY; LOOP
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 584IK
ISSN: 1054-660X
________________________________________
第 112 条,共 159 条
标题: Synthesis and properties of Eu3+-doped strontium fluoroapatite nanocrystals by low-temperature hydrothermal method
作者: Liu, YN (Liu, Yanni); Yu, CH (Yu, Changhai); Zhang, W (Zhang, Wei); Li, JJ (Li, Jinjiang); Peng, B (Peng, Bo); Wei, W (Wei, Wei)
来源出版物: OPTOELECTRONICS AND ADVANCED MATERIALS-RAPID COMMUNICATIONS  卷: 4  期: 4  页: 445-448  出版年: APR 2010 
Web of Science 核心合集中的 "被引频次": 0
被引频次合计: 0
摘要: A novel of Eu3+-doped strontium fluoroapatite nanocrystals (Eu3+: Sr-10(PO4)(6)F-2 or Eu3+:S-FAP) were firstly prepared by a low-temperature hydrothermal method, using ethylenediam-inetetraacetic acid disodium (Na(2)H(2)EDTA) as capping agent. Their morphology and structure were characterized by TEM, XRD and FTIR spectra. The results revealed that the nanocrystals mainly took on spherical-like shape and were well crystalline with an average diameter of less than 80 nm. Photoluminescence spectra indicated that the nanocrystals had high luminescence intensity ratio (R/O) of D-5(0)-> F-7(2) to D-5(0)-> F-7(1) transitions and high quenching concentration. They are promising materials for the applications of laser, display, and sensors.
文献类型: Article
作者关键词: Eu3+-doped nanocrystals; Strontium fluoroapatite; Optical properties
Web of Science 类别: Materials Science, Multidisciplinary; Optics
研究方向: Materials Science; Optics
IDS 号: 594QF
ISSN: 1842-6573
________________________________________
第 113 条,共 159 条
标题: Multi-carbazole derivatives for two-photon absorption data storage: Synthesis, optical properties and theoretical calculation
作者: Li, L (Li Lin); Yang, JX (Yang JiaXiang); Wang, CX (Wang CaiXia); Hu, ZJ (Hu ZhangJun); Tian, YP (Tian YuPeng); Li, J (Li Jing); Wang, CK (Wang ChuanKui); Li, M (Li Ming); Cheng, GH (Cheng GuangHua); Tang, HH (Tang HuoHong); Huang, WH (Huang WenHao); Tao, XT (Tao XuTang); Jiang, MH (Jiang MinHua)
来源出版物: SCIENCE CHINA-CHEMISTRY  卷: 53  期: 4  页: 884-890  DOI: 10.1007/s11426-010-0125-9  出版年: APR 2010 
Web of Science 核心合集中的 "被引频次": 4
被引频次合计: 4
摘要: Two novel quadrupolar organic compounds, 3-(4-((E)-2-(9-butyl-9H-carbazol-6-yl)vinyl)styryl)-9-propyl-9H-carbazole (BCSPC) and 3-(3-(3-((1E)-2-(4-((E)-2-(3-(3,5-bis(9-butyl-9H-carbazol-6-yl)phenyl)-9-butyl-9H-carbazol-6-yl)vinyl)phenyl)vinyl)-9-butyl-9H-carbazol-6-yl)-5-(9-butyl-9H-carbazol-6-yl)phenyl)-9-butyl-9H-carbazole (BCPBC), with different conjugated arms, have been designed and synthesized. Their one- and two-photon absorption (TPA) and excited fluorescence properties have been experimentally investigated. The two-photon absorption cross-sections of two compounds were estimated by two-photon excited fluorescence technique using 200 fs, 76 MHz, Ti:sapphire laser, which are 22 and 154 GM for BCSPC and BCPBC, respectively. The optimal excitation wavelengths are 780 nm for both BCSPC and BCPBC. A data recording experiment proved the potential application of the materials.
文献类型: Article
作者关键词: initiator; optical data storage; fluorescence; two-photon absorption; theoretical calculation
KeyWords Plus: FACILE SYNTHESIS; MULTIBRANCHED STRUCTURES; SINGLET-OXYGEN; CROSS-SECTIONS; FLUORESCENCE; MOLECULES; CHROMOPHORES; MEMORY; MICROFABRICATION; FLUOROPHORES
Web of Science 类别: Chemistry, Multidisciplinary
研究方向: Chemistry
IDS 号: 604FT
ISSN: 1674-7291
________________________________________
第 114 条,共 159 条
标题: Research on the correlation between the optical gap and chemical bond in sulphur and selenium co-doped chalco-halide glasses
作者: Zhu, MX (Zhu, Mingxing); Nie, QH (Nie, Qiuhua); Wang, XS (Wang, Xunsi); Dai, SX (Dai, Shixun); Zhang, XH (Zhang, Xianghua); Shen, X (Shen, Xiang); Wang, GX (Wang, Guoxiang); Lv, X (Lv, Xin)
来源出版物: SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY  卷: 75  期: 4  页: 1275-1279  DOI: 10.1016/j.saa.2009.12.054  出版年: APR 2010 
Web of Science 核心合集中的 "被引频次": 0
被引频次合计: 0
摘要: The Ge-Ga-Se-S-CsCl glasses were prepared by the melting-quenching method. The absorption and transmission spectrum were measured under room temperature. It is found that these glasses have high broad spectral range of transparency from visible to far-infrared region (0.4-12 mu m). The relationship between the optical gap and chemical composition in terms of novel chalco-halide glasses is discussed based on the Pauling's theory model, which is using the modified heats of atomization and the coordination number of the elements, to explain this phenomena for the first time. (C) 2009 Elsevier B.V. All rights reserved.
PubMed ID: 20096623
文献类型: Article
作者关键词: Chalco-halide glasses; Optical gap; IR spectra
KeyWords Plus: SYSTEM
Web of Science 类别: Spectroscopy
研究方向: Spectroscopy
IDS 号: 582IO
ISSN: 1386-1425
________________________________________
第 115 条,共 159 条
标题: Stability Analysis of On-Board Calibration System of Spatially Modulated Imaging Fourier Transform Spectrometer
作者: Gao, J (Gao Jing); Ji, ZY (Ji Zhong-ying); Wang, ZH (Wang Zhong-hou); Cui, Y (Cui Yan)
来源出版物: SPECTROSCOPY AND SPECTRAL ANALYSIS  卷: 30  期: 4  页: 1013-1017  DOI: 10.3964/j.issn.1000-0593(2010)04-1013-05  出版年: APR 2010 
Web of Science 核心合集中的 "被引频次": 0
被引频次合计: 0
摘要: Spatially modulated imaging Fourier transform spectrometer (SMIFTS) was an instrument that depended on interference, and after calibration, the reconstruction spectrum can quantificationally reflect the diffuse reflection of target under sunshine. On-board calibration of SMIFTS confirmed the change of SMIFTS according to relative spectrum calibration, inspected long-time attenuation of SMIFTS optical system, and corrected export data of SMIFTS. According to the requirement of remote sensor application, it must stay in vacuum environment for a long time. As a radiant standard, the stability of lamp-house in long time is the most important characteristic of on-board calibration system. By calculation and experimentation, analyses of on-board calibration of SMIFTS, and testing spaceflight environment characteristic of on-board calibration, the difficulty in the key parts of on-board calibration of SMIFTS such as lamp-house, spectrum filter and integrating sphere was solved. According to the radiation-time stability testing for lamp-house and optics, particle-radiation testing, environmental-mechanics testing and hot vacuum examination, good result was obtained. By whole-aperture and part-field comparative wavelength calibration, the spectrum curve and before-launch interferogram were obtained. After comparison with reconstruction spectrum under different condition, the stability and credibility of SMIFTS on-board calibration system was proved.
文献类型: Article
作者关键词: On-board calibration; Spatially Modulated; Integrating sphere; Spectrum filter; Stability
Web of Science 类别: Spectroscopy
研究方向: Spectroscopy
IDS 号: 581FE
ISSN: 1000-0593
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第 116 条,共 159 条
标题: All-fiber mode-locked nanosecond laser employing intracavity chirped fiber gratings
作者: Wang, HS (Wang, Hushan); Wang, YS (Wang, Yishan); Zhao, W (Zhao, Wei); Zhang, W (Zhang, Wei); Zhang, T (Zhang, Ting); Hu, XH (Hu, Xiaohong); Yang, Z (Yang, Zhi); Liu, HJ (Liu, Hongjun); Duan, KL (Duan, Kailiang); Liu, XM (Liu, Xuemin); Li, C (Li, Cheng); Shen, DY (Shen, Deyuan); Sui, Z (Sui, Zhan); Liu, B (Liu, Bin)
来源出版物: OPTICS EXPRESS  卷: 18  期: 7  页: 7263-7268  DOI: 10.1364/OE.18.007263  出版年: MAR 29 2010 
Web of Science 核心合集中的 "被引频次": 8
被引频次合计: 8
摘要: We demonstrate that nanosecond pulses are generated directly from an all-fiber mode-locked ytterbium-doped fiber laser. A pair of Chirped Fiber Gratings (CFGs) with different sign of dispersion is employed for intracavity dispersion management. Self-starting stabilized mode-locking operation is achieved by nonlinear polarization evolution (NPE). The 1.27 ns pulses are obtained after one CFG with large positive dispersion. The pulse energy is up to 15 nJ at a repetition rate of 3.48 MHz. (C) 2010 Optical Society of America
PubMed ID: 20389747
文献类型: Article
KeyWords Plus: PULSE AMPLIFICATION SYSTEM; NOISE-LIKE PULSES; REPETITION-RATE; RING LASER; ENERGY; GENERATION
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 582MP
ISSN: 1094-4087
________________________________________
第 117 条,共 159 条
标题: Intense green upconversion emission in Tb3+/Yb3+ codoped alumino-germano-silicate optical fibers
作者: Lin, AX (Lin, Aoxiang); Liu, XM (Liu, Xueming); Watekar, PR (Watekar, Pramod R.); Guo, HT (Guo, Haitao); Peng, B (Peng, Bo); Wei, W (Wei, Wei); Lu, M (Lu, Min); Han, WT (Han, Won-Taek); Toulouse, J (Toulouse, Jean)
来源出版物: APPLIED OPTICS  卷: 49  期: 9  页: 1671-1675  DOI: 10.1364/AO.49.001671  出版年: MAR 20 2010 
Web of Science 核心合集中的 "被引频次": 6
被引频次合计: 6
摘要: We observed intense green upconversion emission from Tb3+ centered at 546 nm due to transition D-5(4) --> F-7(5) in Tb3+/Yb3+ codoped alumino-germano-silicate optical fibers by direct excitation of Yb3+ ions with a laser diode at 976 nm. A two-photon cooperative energy transfer upconversion among a pair of Yb3+ donor ions and a Tb3+ acceptor ion are responsible for the observed green emission. Appropriately increasing the concentration of Tb3+ relative to Yb3+ was found to facilitate the energy transfer upconversion process from Yb3+ to Tb3+, while an excess of Tb3+ ions inversely introduced more of the concentration quenching effect and phonon-assistant backward energy transfer from Tb3+ to Yb3+ and, therefore, damaged the observed green emission. The intensity of the observed green emission was found optimum for a concentration ratio of Tb3+ to Yb3+ of 2 : 1 in alumino-germano-silicate optical glass fibers. (C) 2010 Optical Society of America
PubMed ID: 20300166
文献类型: Article
KeyWords Plus: COOPERATIVE ENERGY-TRANSFER; DOPED TELLURITE GLASS; SPECTROSCOPIC PROPERTIES; LASER; IONS; NONLINEARITY; LUMINESCENCE; YTTERBIUM; TERBIUM; TM3+
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 571HS
ISSN: 1559-128X
电子 ISSN: 2155-3165
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第 118 条,共 159 条
标题: Energy quantisation for dissipative solitons
作者: Wang, LR (Wang, L. R.); Liu, XM (Liu, X. M.); Gong, YK (Gong, Y. K.); Mao, D (Mao, D.); Li, XH (Li, X. H.)
来源出版物: ELECTRONICS LETTERS  卷: 46  期: 6  页: 436-U80  DOI: 10.1049/el.2010.0359  出版年: MAR 18 2010 
Web of Science 核心合集中的 "被引频次": 4
被引频次合计: 4
摘要: The energy quantisation effect for dissipative solitons is experimentally observed in an erbium-doped fibre laser with large normal-cavity-dispersion. Experimental results reveal that the steady dissipative solitons tend to be restricted by an upper energy limit and the increment of pump power approaches to a constant with respect to the pulse number.
文献类型: Article
KeyWords Plus: FIBER LASER; DOPED FIBER; DISPERSION
Web of Science 类别: Engineering, Electrical & Electronic
研究方向: Engineering
IDS 号: 579PH
ISSN: 0013-5194
________________________________________
第 119 条,共 159 条
标题: Ultra-dry oxygen atmosphere to protect tellurite glass fiber from surface crystallization
作者: Zhang, AD (Zhang, Aidong); Lin, AX (Lin, Aoxiang); Toulouse, J (Toulouse, Jean)
来源出版物: JOURNAL OF NON-CRYSTALLINE SOLIDS  卷: 356  期: 9-10  页: 525-528  DOI: 10.1016/j.jnoncrysol.2010.01.001  出版年: MAR 15 2010 
Web of Science 核心合集中的 "被引频次": 5
被引频次合计: 5
摘要: In this study we report on surface crystallization phenomena and propose a solution for the fabrication of long and robust tellurite glass fibers. The bulk tellurite glasses of interest were prepared by melting and quenching techniques. Tellurite glass preforms and fibers were fabricated by suction casting and rod-in-tube drawing methods, respectively. The surfaces of the tellurite bulk glass samples and of the drawn fibers prepared under different controlled atmospheres were examined by X-ray diffraction. When the tellurite glass fibers were drawn in ambient air containing water vapor, four primary kinds of small crystals were found to appear on the fiber surface, alpha-TeO(2), gamma-TeO(2), Zn(2)Te(3)O(8) and Na(2)Zn(3)(CO(3))(4)center dot 3H(2)O. A mechanism for this surface crystallization is proposed and a solution described, using an ultra-dry oxygen gas atmosphere to effectively prevent surface crystallization during fiber drawing. (C) 2010 Elsevier B.V. All rights reserved.
文献类型: Article
作者关键词: Optical fibers; Non-linear optics; Tellurites
KeyWords Plus: MICROSTRUCTURAL CHARACTERIZATION; BEHAVIOR
Web of Science 类别: Materials Science, Ceramics; Materials Science, Multidisciplinary
研究方向: Materials Science
IDS 号: 571QO
ISSN: 0022-3093
________________________________________
第 120 条,共 159 条
标题: The data processing of the temporarily and spatially mixed modulated polarization interference imaging spectrometer
作者: Jian, XH (Jian, Xiaohua); Zhang, CM (Zhang, Chunmin); Zhang, L (Zhang, Lin); Zhao, BC (Zhao, Baochang)
来源出版物: OPTICS EXPRESS  卷: 18  期: 6  页: 5674-5680  DOI: 10.1364/OE.18.005674  出版年: MAR 15 2010 
Web of Science 核心合集中的 "被引频次": 23
被引频次合计: 24
摘要: Based on the basic imaging theory of the temporally and spatially mixed modulated polarization interference imaging spectrometer (TSMPIIS), a method of interferogram obtaining and processing under polychromatic light is presented. Especially, instead of traditional Fourier transform spectroscopy, according to the unique imaging theory and OPD variation of TSMPIIS, the spectrum is reconstructed respectively by wavelength. In addition, the originally experimental interferogram obtained by TSMPIIS is processed in this new way, the satisfying result of interference data and reconstructed spectrum prove that the method is very precise and feasible, which will great improve the performance of TSMPIIS. (C) 2010 Optical Society of America
PubMed ID: 20389583
文献类型: Article
KeyWords Plus: ORIENTATION
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 574PE
ISSN: 1094-4087
________________________________________
第 121 条,共 159 条
标题: Dispersion measurement of Yb-doped fiber by a spectral interferometric technique
作者: Zhang, T (Zhang, Ting); Yang, Z (Yang, Zhi); Zhao, W (Zhao, Wei); Wang, YS (Wang, Yishan); Fang, P (Fang, Ping); Li, C (Li, Cheng)
来源出版物: CHINESE OPTICS LETTERS  卷: 8  期: 3  页: 262-265  DOI: 10.3788/COL20100803.0262  出版年: MAR 10 2010 
Web of Science 核心合集中的 "被引频次": 2
被引频次合计: 2
摘要: The dispersion of Yb-doped fiber is measured by a spectral interferometric technique The experimental verification is achieved by comparing the measured data with published data of the Nufern 1060xp fiber and the measurement relative error is 1 36% The parameters of the experimental system, such as minimum required source bandwidth and minimum fiber length, are introduced and analyzed in the measurement minimum required source bandwidth predicted through theoretical calculation at the center wavelength of 1070 mini is 19 3 inn, which perfectly agrees with the experimental value
文献类型: Article
KeyWords Plus: WHITE-LIGHT INTERFEROMETRY; MODE OPTICAL FIBERS; CHROMATIC DISPERSION; SHORT LENGTHS
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 572IG
ISSN: 1671-7694
________________________________________
第 122 条,共 159 条
标题: Evolution properties of the field quantum entropy in the nonlinear Jaynes-Cummings model of a trapped ion
作者: Liu, WY (Liu Wang-Yun); Bi, SW (Bi Si-Wen); Dou, XB (Dou Xi-Bo)
来源出版物: ACTA PHYSICA SINICA  卷: 59  期: 3  页: 1780-1785  出版年: MAR 2010 
Web of Science 核心合集中的 "被引频次": 2
被引频次合计: 3
摘要: The time evolution properties of the field quantum entropy in the system of a trapped ion interacting resonantly with a standing-wave laser field is studied by utilizing the Von Neumann reduced quantum entropy theory, and our attention focuses on the discussion of the influence of the Lamb-Dick parameter, the position of the ion in the standing-wave laser field and the initial state of the trapped ion on the evolution properties of the field quantum entropy. The results obtained from the numerical calculation indicate that: the value of the Lamb-Dick parameter effect the oscillation frequency and amplitude of the quantum entanglement between the trapped ion and the standing-wave laser field, the larger the Lamb-Dick parameter is, the weaker the average entanglement level between the ion and the field will be. When moving the tapped ion from the node of the standing-wave laser to the loop, the vibration frequency of the quantum entanglement between the field and the ion becomes slow gradually, and the entanglement degree gets weaker and weaker. With the decrease of the probability of the trapped ion being in the excited state, the quantum entanglement between the trapped ion and the stanging-wave laser field shows the tendency of increase first and then decrease. These properties have certain reference value for the preparation of entangled states and for the quantum communications with the thapped ion, and so on.
文献类型: Article
作者关键词: quantum information science; trapped ion; nonlinear Jaynes-Cummings model; field quantum entropy
KeyWords Plus: COHERENT STATES; COLD ION; ATOM; TELEPORTATION; GENERATION; RESONANCE; PHASE
Web of Science 类别: Physics, Multidisciplinary
研究方向: Physics
IDS 号: 574PQ
ISSN: 1000-3290
________________________________________
第 123 条,共 159 条
标题: On Combining Morphological Component Analysis and Concentric Morphology Model for Mammographic Mass Detection
作者: Gao, XB (Gao, Xinbo); Wang, Y (Wang, Ying); Li, XL (Li, Xuelong); Tao, DC (Tao, Dacheng)
来源出版物: IEEE TRANSACTIONS ON INFORMATION TECHNOLOGY IN BIOMEDICINE  卷: 14  期: 2  页: 266-273  DOI: 10.1109/TITB.2009.2036167  出版年: MAR 2010 
Web of Science 核心合集中的 "被引频次": 16
被引频次合计: 20
摘要: Mammographic mass detection is an important task for the early diagnosis of breast cancer. However, it is difficult to distinguish masses from normal regions because of their abundant morphological characteristics and ambiguous margins. To improve the mass detection performance, it is essential to effectively preprocess mammogram to preserve both the intensity distribution and morphological characteristics of regions. In this paper, morphological component analysis is first introduced to decompose a mammogram into a piecewise-smooth component and a texture component. The former is utilized in our detection scheme as it effectively suppresses both structural noises and effects of blood vessels. Then, we propose two novel concentric layer criteria to detect different types of suspicious regions in a mammogram. The combination is evaluated based on the Digital Database for Screening Mammography, where 100 malignant cases and 50 benign cases are utilized. The sensitivity of the proposed scheme is 99% in malignant, 88% in benign, and 95.3% in all types of cases. The results show that the proposed detection scheme achieves satisfactory detection performance and preferable compromises between sensitivity and false positive rates.
PubMed ID: 19906595
文献类型: Article
作者关键词: Breast cancer; computer-aided detection; mass detection; morphological component analysis (MCA); morphology concentric layer
KeyWords Plus: COMPUTERIZED DETECTION; BREAST MASSES; DENSITY; TUMORS
Web of Science 类别: Computer Science, Information Systems; Computer Science, Interdisciplinary Applications; Mathematical & Computational Biology; Medical Informatics
研究方向: Computer Science; Mathematical & Computational Biology; Medical Informatics
IDS 号: 570IG
ISSN: 1089-7771
________________________________________
第 124 条,共 159 条
标题: A Review of Active Appearance Models
作者: Gao, XB (Gao, Xinbo); Su, Y (Su, Ya); Li, XL (Li, Xuelong); Tao, DC (Tao, Dacheng)
来源出版物: IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS PART C-APPLICATIONS AND REVIEWS  卷: 40  期: 2  页: 145-158  DOI: 10.1109/TSMCC.2009.2035631  出版年: MAR 2010 
Web of Science 核心合集中的 "被引频次": 21
被引频次合计: 26
摘要: Active appearance model (AAM) is a powerful generative method for modeling deformable objects. The model decouples the shape and the texture variations of objects, which is followed by an efficient gradient-based model fitting method. Due to the flexible and simple framework, AAM has been widely applied in the fields of computer vision. However, difficulties are met when it is applied to various practical issues, which lead to a lot of prominent improvements to the model. Nevertheless, these difficulties and improvements have not been studied systematically. This motivates us to review the recent advances of AAM. This paper focuses on the improvements in the literature in turns of the problems suffered by AAM in practical applications. Therefore, these algorithms are summarized from three aspects, i.e., efficiency, discrimination, and robustness. Additionally, some applications and implementations of AAM are also enumerated. The main purpose of this paper is to serve as a guide for further research.
文献类型: Review
作者关键词: Active appearance model (AAM); review
KeyWords Plus: FACIAL EXPRESSION RECOGNITION; FACE RECOGNITION; SHAPE MODELS; CARDIAC MR; SEGMENTATION; IMAGES; SEQUENCES; GENDER; MOTION; AAM
Web of Science 类别: Computer Science, Artificial Intelligence; Computer Science, Cybernetics; Computer Science, Interdisciplinary Applications
研究方向: Computer Science
IDS 号: 558JD
ISSN: 1094-6977
________________________________________
第 125 条,共 159 条
标题: Phase-shifting point-diffraction interferometry with common-path and in-line configuration for microscopy
作者: Gao, P (Gao, Peng); Harder, I (Harder, Irina); Nercissian, V (Nercissian, Vanusch); Mantel, K (Mantel, Klaus); Yao, BL (Yao, Baoli)
来源出版物: OPTICS LETTERS  卷: 35  期: 5  页: 712-714  出版年: MAR 1 2010 
Web of Science 核心合集中的 "被引频次": 21
被引频次合计: 21
摘要: A new common-path and in-line point-diffraction interferometer for quantitative phase microscopy is proposed. The interferometer is constructed by introducing a grating pair into the point-diffraction interferometer, thus forming a common-path and in-line configuration for object and reference waves. Achromatic phase shifting is implemented by linearly moving one of the two gratings in its grating vector direction. The feasibility of the proposed configuration is demonstrated by theoretical analysis and experiments. (C) 2010 Optical Society of America
PubMed ID: 20195328
文献类型: Article
KeyWords Plus: LATERAL SHEARING INTERFEROMETER; GRATING INTERFEROMETER; DYNAMICS
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 572JG
ISSN: 0146-9592
________________________________________
第 126 条,共 159 条
标题: Research on Spatially Modulated Fourier Transform Imaging Spectrometer Data Processing Method
作者: Huang, M (Huang Min); Xiangli, B (Xiangli Bin); Lu, QB (Lue Qun-bo); Zhou, JS (Zhou Jin-song); Jing, JJ (Jing Juan-juan); Cui, Y (Cui Yan)
来源出版物: SPECTROSCOPY AND SPECTRAL ANALYSIS  卷: 30  期: 3  页: 855-858  DOI: 10.3964/j.issn.1000-0593(2010)03-0855-04  出版年: MAR 2010 
Web of Science 核心合集中的 "被引频次": 2
被引频次合计: 5
摘要: Fourier transform imaging spectrometer is a new technic, and has been developed very rapidly in nearly ten years. The data catched by Fourier transform imaging spectrometer is indirect data, can not be used by user, and need to be processed by various approaches, including data pretreatment, apodization, phase correction, FFT, and spectral radicalization calibration. No paper so far has been found roundly to introduce this method. In the present paper, the author will give an effective method to process the interfering data to spectral data, and with this method we can obtain good result.
文献类型: Article
作者关键词: Spatial modulation; Fourier transform imaging spectrometer; Data processing
KeyWords Plus: INTERFEROGRAMS; SPECTROSCOPY
Web of Science 类别: Spectroscopy
研究方向: Spectroscopy
IDS 号: 565NF
ISSN: 1000-0593
________________________________________
第 127 条,共 159 条
标题: Generation of synchronized femtosecond and picosecond laser pulses in a two-beam-pumped Ti:sapphire laser
作者: Zhu, CJ (Zhu, Changjun); He, JF (He, Junfang); Zhai, XJ (Zhai, Xuejun); Xue, B (Xue, Bing); Zhang, CH (Zhang, Chonghui)
来源出版物: CHINESE OPTICS LETTERS  卷: 8  期: 2  页: 194-196  DOI: 10.3788/COL20100802.0194  出版年: FEB 10 2010 
Web of Science 核心合集中的 "被引频次": 0
被引频次合计: 0
摘要: Two operating modes, independent self-mode-locking and cross-mode-locking, are presented in a two-beam-pumped double-cavity dual-wavelength femtosecond Ti:sapphire laser. Synchronization of femtosecond and picosecond laser pulses is achieved by properly adjusting the cavity length matching and distributing the pump laser powers in the two laser cavities, and moreover, a timing jitter of 517 fs between femtosecond and picosecond pulses is obtained, with wavelength tuning ranges around 36 and 22 nm in the femtosecond and picosecond cavities, respectively.
文献类型: Article
KeyWords Plus: TI-SAPPHIRE LASER; SUBFEMTOSECOND TIMING JITTER; OPERATION
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 552WF
ISSN: 1671-7694
________________________________________
第 128 条,共 159 条
标题: Double differential cross sections of light charged particle emission in neutron induced reactions on Fe-54,Fe-56,Fe-57,Fe-58
作者: Zhang, ZJ (Zhang, Zhengjun); Han, YL (Han, Yinlu); Cai, CH (Cai, Chonghai)
来源出版物: ANNALS OF NUCLEAR ENERGY  卷: 37  期: 2  页: 130-143  DOI: 10.1016/j.anucene.2009.11.013  出版年: FEB 2010 
Web of Science 核心合集中的 "被引频次": 0
被引频次合计: 1
摘要: The energy spectra and double differential cross sections of the light composite particle (deuteron, triton, helium and alpha-particle) emissions for n + Fe-54,Fe-56,Fe-57,Fe-58 reaction are studied by integrating the optical model, the intra-nuclear cascade model, direct reaction theories, equilibrium reaction theory and the exciton model which included the improved Iwamoto-Harada model. Theoretical calculated results are compared with existing experimental data. (C) 2009 Elsevier Ltd. All rights reserved.
文献类型: Article
KeyWords Plus: CONTINUUM ANGULAR-DISTRIBUTIONS; EXCITON MODEL; NUCLEAR-DATA; STATISTICAL-MODEL; COMPLEX PARTICLES; SYSTEMATICS; EXTENSIONS; GENERATION; PARAMETERS; ENERGIES
Web of Science 类别: Nuclear Science & Technology
研究方向: Nuclear Science & Technology
IDS 号: 559KA
ISSN: 0306-4549
________________________________________
第 129 条,共 159 条
标题: Yb3+-doped 200 mu m diameter core, gain guided index-antiguided fiber
作者: Lu, M (Lu, M.); Li, W (Li, W.); Zou, K (Zou, K.); Dai, S (Dai, S.); Wei, W (Wei, W.); Peng, B (Peng, B.)
来源出版物: APPLIED PHYSICS B-LASERS AND OPTICS  卷: 98  期: 2-3  页: 301-304  DOI: 10.1007/s00340-009-3737-z  出版年: FEB 2010 
Web of Science 核心合集中的 "被引频次": 7
被引频次合计: 9
摘要: The lasing in an end-pumped gain guided index-antiguided (GG-IAG) Yb3+-doped silicate glass fiber with a 200 mu m diameter core is demonstrated. Laser beams with similar beam propagation factors M (2) and mode field diameters W (0) (> 160 mu m) were observed at the output end of the GG-IAG fibers under different pump powers, which indicated that single mode behavior and excellent beam quality were achieved during propagation. Furthermore, the laser amplifier characteristics in the present Yb3+-doped GG-IAG fiber were also evaluated.
文献类型: Article
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 540CC
ISSN: 0946-2171
________________________________________
第 130 条,共 159 条
标题: Incoherently coupled soliton pairs in nonlocal nonlinear media
作者: Lu, KQ (Lu Ke-Qing); Li, KH (Li Ke-Hao); Zhao, W (Zhao Wei); Zhang, YQ (Zhang Yi-Qi); Zhang, MZ (Zhang Mei-Zhi); Zhang, YH (Zhang Yu-Hong); Cheng, GH (Cheng Guang-Hua); Zhang, YP (Zhang Yan-Peng)
来源出版物: CHINESE PHYSICS B  卷: 19  期: 2  文献号: 024211  出版年: FEB 2010 
Web of Science 核心合集中的 "被引频次": 2
被引频次合计: 2
摘要: We show that incoherently coupled soliton pairs can exist in nonlocal Kerr-type nonlinear media. Such solitons can propagate in bright-bright, dark-dark, and gray-gray configurations. When the nonlocal nonlinearity is absent, these bright-bright and dark-dark soliton pairs are those observed previously in local Kerr-type nonlinear media. Our analysis indicates that for a self-focusing nonlinearity the intensity full width half maximum (FWHM) of the bright-bright pair components increases with the degree of nonlocality of the nonlinear response, whereas for a self-defocusing nonlinearity the intensity FWHM of the dark-dark and gray-gray pair components decreases with the increase in the degree of nonlocality of the nonlinear response. The stability of these soliton pairs has been investigated numerically and it has been found that they are stable.
文献类型: Article
作者关键词: soliton pair; Kerr effect; nonlinear optics
KeyWords Plus: GRAY SPATIAL SOLITONS; PHOTOREFRACTIVE MEDIA; WAVE-GUIDES; BRIGHT; INSTABILITY
Web of Science 类别: Physics, Multidisciplinary
研究方向: Physics
IDS 号: 561BG
ISSN: 1674-1056
________________________________________
第 131 条,共 159 条
标题: Robust Tensor Analysis With L1-Norm
作者: Pang, YW (Pang, Yanwei); Li, XL (Li, Xuelong); Yuan, Y (Yuan, Yuan)
来源出版物: IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY  卷: 20  期: 2  页: 172-178  DOI: 10.1109/TCSVT.2009.2020337  出版年: FEB 2010 
Web of Science 核心合集中的 "被引频次": 45
被引频次合计: 47
摘要: Tensor analysis plays an important role in modern image and vision computing problems. Most of the existing tensor analysis approaches are based on the Frobenius norm, which makes them sensitive to outliers. In this paper, we propose L1-norm-based tensor analysis (TPCA-L1), which is robust to outliers. Experimental results upon face and other datasets demonstrate the advantages of the proposed approach.
文献类型: Article
作者关键词: L1-norm; outlier; tensor analysis
KeyWords Plus: RECOGNITION; APPEARANCE
Web of Science 类别: Engineering, Electrical & Electronic
研究方向: Engineering
IDS 号: 553VM
ISSN: 1051-8215
________________________________________
第 132 条,共 159 条
标题: Discriminative Orthogonal Neighborhood-Preserving Projections for Classification
作者: Zhang, TH (Zhang, Tianhao); Huang, KQ (Huang, Kaiqi); Li, XL (Li, Xuelong); Yang, J (Yang, Jie); Tao, DC (Tao, Dacheng)
来源出版物: IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS PART B-CYBERNETICS  卷: 40  期: 1  页: 253-263  DOI: 10.1109/TSMCB.2009.2027473  出版年: FEB 2010 
Web of Science 核心合集中的 "被引频次": 30
被引频次合计: 35
摘要: Orthogonal neighborhood-preserving projection (ONPP) is a recently developed orthogonal linear algorithm for overcoming the out-of-sample problem existing in the well-known manifold learning algorithm, i.e., locally linear embedding. It has been shown that ONPP is a strong analyzer of high-dimensional data. However, when applied to classification problems in a supervised setting, ONPP only focuses on the intraclass geometrical information while ignores the interaction of samples from different classes. To enhance the performance of ONPP in classification, a new algorithm termed discriminative ONPP (DONPP) is proposed in this paper. DONPP 1) takes into account both intraclass and interclass geometries; 2) considers the neighborhood information of interclass relationships; and 3) follows the orthogonality property of ONPP. Furthermore, DONPP is extended to the semisupervised case, i.e., semisupervised DONPP (SDONPP). This uses unlabeled samples to improve the classification accuracy of the original DONPP. Empirical studies demonstrate the effectiveness of both DONPP and SDONPP.
PubMed ID: 19744914
文献类型: Article
作者关键词: Classification; dimensionality reduction; discriminative orthogonal neighborhood-preserving projection (DONPP); patch alignment
KeyWords Plus: DIMENSIONALITY REDUCTION; GEOMETRIC FRAMEWORK; GAIT RECOGNITION; IMAGE RETRIEVAL; SUBSPACE
Web of Science 类别: Automation & Control Systems; Computer Science, Artificial Intelligence; Computer Science, Cybernetics
研究方向: Automation & Control Systems; Computer Science
IDS 号: 515BG
ISSN: 1083-4419
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第 133 条,共 159 条
标题: Broadly Tunable Dual-Wavelength Erbium-Doped Ring Fiber Laser Based on a High-birefringence Fiber Loop Mirror
作者: Sun, HB (Sun, H. B.); Liu, XM (Liu, X. M.); Gong, YK (Gong, Y. K.); Li, XH (Li, X. H.); Wang, LR (Wang, L. R.)
来源出版物: LASER PHYSICS  卷: 20  期: 2  页: 522-527  DOI: 10.1134/S1054660X10030175  出版年: FEB 2010 
Web of Science 核心合集中的 "被引频次": 37
被引频次合计: 37
摘要: A broadly tunable dual-wavelength erbium-doped ring fiber laser based on a high-birefringence fiber loop mirror (HiBi-FLM) and a polarization controller is demonstrated experimentally. The measured transmission spectrum of HiBi-FLM covers a wide range from 1525 to 1575 nm. The wavelength of proposed laser can be flexibly tunable during this range of similar to 50 nm by adjusting the polarization controller. In addition, the spacing of two wavelengths is adjustable by changing the length of HiBi fiber. The dual-wavelength lasers with the HiBi fiber length of 1 and 2 m are experimentally demonstrated and compared. The experimental results show that the proposed laser can stably operate on two wavelengths simultaneously at room temperature, and the output peak power variation is about 0.5 dB during 40 min.
文献类型: Article
KeyWords Plus: PHOTONIC CRYSTAL FIBER; MULTIWAVELENGTH BRILLOUIN FIBER; BRAGG GRATINGS; POLARIZATION CONTROLLERS; FILTER
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 575JL
ISSN: 1054-660X
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第 134 条,共 159 条
标题: SIMULTANEOUS OTDM DEMULTIPLEXING AND DATA FORMAT CONVERSION USING A D FLIP-FLOP
作者: Xie, YY (Xie, Yiyuan); Zhang, JG (Zhang, Jianguo); Xu, J (Xu, Jiang)
来源出版物: MICROWAVE AND OPTICAL TECHNOLOGY LETTERS  卷: 52  期: 2  页: 398-400  DOI: 10.1002/mop.24955  出版年: FEB 2010 
Web of Science 核心合集中的 "被引频次": 0
被引频次合计: 0
摘要: A D flip-flop is used to simultaneously demultiplex and data format conversion a single 10 Gbits/s channel from a 20 Gbits/s optical time-division multiplexed data stream. Error-free demultiplexing was achieved at very low optical signal power: -14 dBm (20 Gbits/s). The proposed demultiplexer has a simple structure and achieves return-to-zero (RZ) to nonreturn-to-zero (NRZ) data format conversion. The demultiplexer allows monolithic integration. The proposed demultiplexer will become an important interface technology in future for connecting the ultra-fast optical time division multiplexing (OTDM) long haul networks to the wavelength division multiplexing (WDM) access and metro networks. (C) 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 398-400, 2010; Published online in Wiley InterScience (
www.interscience.wiley.com). DOI 10.1002/mop.24955
文献类型: Article
作者关键词: optical time-division multiplex; D flip-flop; return-to-zero (RZ); nonreturn-to-zero (NRZ)
KeyWords Plus: SYSTEMS; FIBER
Web of Science 类别: Engineering, Electrical & Electronic; Optics
研究方向: Engineering; Optics
IDS 号: 541SH
ISSN: 0895-2477
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第 135 条,共 159 条
标题: Influence of the time modulation of the pump laser caused by mode beating on optical parametric process
作者: Sun, QB (Sun, Qibing); Liu, HJ (Liu, Hongjun); Huang, N (Huang, Nan); Long, HB (Long, Hanbo); Wen, J (Wen, Jin); Zhu, SL (Zhu, Shaolan); Zhao, W (Zhao, Wei)
来源出版物: OPTICS EXPRESS  卷: 18  期: 3  页: 3101-3108  DOI: 10.1364/OE.18.003101  出版年: FEB 1 2010 
Web of Science 核心合集中的 "被引频次": 2
被引频次合计: 2
摘要: Numerical simulation and analysis about the influence of the time modulation of the pump laser caused by mode beating on optical parametric process are presented with OPA and OPG as examples. It is shown that the output power of the generated beams from optical parametric process is modulated in the time domain and exhibits large power fluctuations, when a Q-switched laser oscillating on several random longitudinal modes is used as the pump laser. Irregular spike sequences of the generated beams are observed. We also find that the output power of the light from optical parametric process becomes more stable and exhibits a less fluctuation, when the number of the longitudinal modes (n) increases. (C) 2010 Optical Society of America
PubMed ID: 20174142
文献类型: Article
KeyWords Plus: SINGLE-LONGITUDINAL-MODE; INTRACAVITY KTA OPO; HIGH-REPETITION-RATE; NUMERICAL-SIMULATION; ND-GDVO4 LASER; LIGHT-PULSES; MU-M; OSCILLATOR; POWER; OUTPUT
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 559AD
ISSN: 1094-4087
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第 136 条,共 159 条
标题: High-channel-count plasmonic filter with the metal-insulator-metal Fibonacci-sequence gratings
作者: Gong, YK (Gong, Yongkang); Liu, XM (Liu, Xueming); Wang, LR (Wang, Leiran)
来源出版物: OPTICS LETTERS  卷: 35  期: 3  页: 285-287  出版年: FEB 1 2010 
Web of Science 核心合集中的 "被引频次": 32
被引频次合计: 33
摘要: Fibonacci-sequence gratings based on metal-insulator-metal waveguides are proposed. The spectrum properties of this structure are numerically investigated by using the transfer matrix method. Numerical results demonstrate that the proposed structure can generate high-channel-count plasmonic stop bands and can find significant applications in highly integrated dense wavelength division multiplexing networks. (C) 2010 Optical Society of America
PubMed ID: 20125696
文献类型: Article
KeyWords Plus: DIELECTRIC MULTILAYERS; WAVE-GUIDES; BRAGG GRATINGS; LIGHT WAVES; LOCALIZATION; TRANSMISSION; OPTICS
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 551GX
ISSN: 0146-9592
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第 137 条,共 159 条
标题: Hysteresis phenomena and multipulse formation of a dissipative system in a passively mode-locked fiber laser
作者: Liu, XM (Liu, Xueming)
来源出版物: PHYSICAL REVIEW A  卷: 81  期: 2  文献号: 023811  DOI: 10.1103/PhysRevA.81.023811  出版年: FEB 2010 
Web of Science 核心合集中的 "被引频次": 70
被引频次合计: 71
摘要: A model describing the dissipative soliton evolution in a passively mode-locked fiber laser is proposed by using the nonlinear polarization rotation technique and the spectral filtering effect. It is numerically found that the laser alternately evolves on the stable and unstable mode-locking states as a function of the pump strength. Numerical simulations show that the passively mode-locked fiber lasers with large net normal dispersion can operate on multiple pulse behavior and hysteresis phenomena. The experimental observations confirm the theoretical predictions. The theoretical and experimental results achieved are qualitatively distinct from those observed in net-anomalous-dispersion conventional-soliton fiber lasers.
文献类型: Article
KeyWords Plus: NORMAL DISPERSION; RING LASER; DOPED FIBER; MECHANISM; SOLITONS
Web of Science 类别: Optics; Physics, Atomic, Molecular & Chemical
研究方向: Optics; Physics
IDS 号: 562RW
ISSN: 1050-2947
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第 138 条,共 159 条
标题: A multi-frame image super-resolution method
作者: Li, XL (Li, Xuelong); Hu, YT (Hu, Yanting); Gao, XB (Gao, Xinbo); Tao, DC (Tao, Dacheng); Ning, BJ (Ning, Beijia)
来源出版物: SIGNAL PROCESSING  卷: 90  期: 2  页: 405-414  DOI: 10.1016/j.sigpro.2009.05.028  出版年: FEB 2010 
Web of Science 核心合集中的 "被引频次": 45
被引频次合计: 54
摘要: Multi-frame image super-resolution (SR) aims to utilize information from a set of low-resolution (LR) images to compose a high-resolution (HR) one. As it is desirable or essential in many real applications, recent years have witnessed the growing interest in the problem of multi-frame SR reconstruction. This set of algorithms commonly utilizes a linear observation model to construct the relationship between the recorded LR images to the unknown reconstructed HR image estimates. Recently, regularization-based schemes have been demonstrated to be effective because SR reconstruction is actually an ill-posed problem. Working within this promising framework, this paper first proposes two new regularization items, termed as locally adaptive bilateral total variation and consistency of gradients, to keep edges and flat regions, which are implicitly described in LR images, sharp and smooth, respectively. Thereafter, the combination of the proposed regularization items is superior to existing regularization items because it considers both edges and flat regions while existing ones consider only edges. Thorough experimental results show the effectiveness of the new algorithm for SR reconstruction. (C) 2009 Elsevier B.V. All rights reserved.
文献类型: Article
作者关键词: Computer vision; Machine learning; Super-resolution; Regularization; Fuzzy entropy
KeyWords Plus: SUPER RESOLUTION; RECONSTRUCTION; REGULARIZATION; FRAMES
Web of Science 类别: Engineering, Electrical & Electronic
研究方向: Engineering
IDS 号: 513OK
ISSN: 0165-1684
________________________________________
第 139 条,共 159 条
标题: Optimized sinusoidal phase mask to extend the depth of field of an incoherent imaging system
作者: Zhao, H (Zhao, Hui); Li, YC (Li, Yingcai)
来源出版物: OPTICS LETTERS  卷: 35  期: 2  页: 267-269  出版年: JAN 15 2010 
Web of Science 核心合集中的 "被引频次": 21
被引频次合计: 22
摘要: Wavefront coding is a powerful technique that can be used to extend the depth of field of an incoherent imaging system. By adding a suitable phase mask to the aperture plane, the optical transfer function of a conventional imaging system can be made defocus invariant. Since 1995, when a cubic phase mask was first suggested, many kinds of phase masks have been proposed to achieve the goal of depth extension. In this Letter, a phase mask based on sinusoidal function is designed to enrich the family of phase masks. Numerical evaluation demonstrates that the proposed mask is not only less sensitive to focus errors than cubic, exponential, and modified logarithmic masks are, but it also has a smaller point-spread-function shifting effect. (C) 2010 Optical Society of America
PubMed ID: 20081991
文献类型: Article
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 547IA
ISSN: 0146-9592
________________________________________
第 140 条,共 159 条
标题: Performance of an improved logarithmic phase mask with optimized parameters in a wavefront-coding system
作者: Zhao, H (Zhao, Hui); Li, YC (Li, Yingcai)
来源出版物: APPLIED OPTICS  卷: 49  期: 2  页: 229-238  DOI: 10.1364/AO.49.000229  出版年: JAN 10 2010 
Web of Science 核心合集中的 "被引频次": 6
被引频次合计: 6
摘要: In two papers [Proc. SPIE 4471, 272-280 (2001) and Appl. Opt. 43, 2709-2721 (2004)], a logarithmic phase mask was proposed and proved to be effective in extending the depth of field; however, according to our research, this mask is not that perfect because the corresponding defocused modulation transfer function has large oscillations in the low-frequency region, even when the mask is optimized. So, in a previously published paper [Opt. Lett. 33, 1171-1173 (2008)], we proposed an improved logarithmic phase mask by making a small modification. The new mask can not only eliminate the drawbacks to a certain extent but can also be even less sensitive to focus errors according to Fisher information criteria. However, the performance comparison was carried out with the modified mask not being optimized, which was not reasonable. In this manuscript, we optimize the modified logarithmic phase mask first before analyzing its performance and more convincing results have been obtained based on the analysis of several frequently used metrics. (C) 2010 Optical Society of America
PubMed ID: 20062510
文献类型: Article
KeyWords Plus: FIELD; DEPTH; EXTEND
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 547IH
ISSN: 1559-128X
电子 ISSN: 2155-3165
________________________________________
第 141 条,共 159 条
标题: Multimode squeezed light generation in a three-plane-mirror confocal cavity
作者: Wang, L (Wang Li); Bi, SW (Bi Si-Wen); Wang, GG (Wang Guo-Guo)
来源出版物: ACTA PHYSICA SINICA  卷: 59  期: 1  页: 87-91  出版年: JAN 2010 
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 propose a kind of degenerate optical parametric oscillator below threshold and use the thin crystal approximation to analyze the quantum noise reduction of the spectrum emitted from this cavity, and get the relation between the squeezing level and the pump field or the cavity detuning. We found that better squeezing level could be obtained only by properly choosing the phase of the local field, the amplitude of the pump field and the cavity detuning of the confocal cavity.
文献类型: Article
作者关键词: confocal cavity; multimode squeezing light; balanced homodyne detection; squeezed level
KeyWords Plus: QUANTUM LIMITS; STATES
Web of Science 类别: Physics, Multidisciplinary
研究方向: Physics
IDS 号: 551OO
ISSN: 1000-3290
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第 142 条,共 159 条
标题: Effect of vectorial nature on spectral anomalies of ultrashort pulsed beams from a hard-edged aperture
作者: Yang, Y (Yang, Y.); Duan, K (Duan, K.); Jiang, D (Jiang, D.); Zhang, J (Zhang, J.); Chen, Y (Chen, Y.)
来源出版物: APPLIED PHYSICS B-LASERS AND OPTICS  卷: 98  期: 1  页: 125-131  DOI: 10.1007/s00340-009-3730-6  出版年: JAN 2010 
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 vectorial Rayleigh-Sommerfeld diffraction integrals, the analytical expression for the spectral intensity of a vectorial nonparaxial ultrashort pulsed Gaussian beam diffracted at a rectangular hard-aperture is derived. The results of the far-field and paraxial cases can be regarded as special cases of the general expression. Effect of vectorial nature on spectral anomalies of ultrashort pulsed beams passing through a hard-edged aperture is analyzed in detail. It is shown that the spectral switch near the phase singularity, which is predicated under the condition of the scalar paraxial theory, disappears with the increasing effect of the vectorial and nonparaxial nature.
文献类型: Article
KeyWords Plus: PARTIALLY COHERENT-LIGHT; GAUSSIAN BEAMS; PHASE SINGULARITIES; NUMERICAL-APERTURE; CIRCULAR APERTURE; FAR-FIELD; DIFFRACTION; SWITCHES; BEHAVIOR; SHIFTS
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 521TT
ISSN: 0946-2171
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第 143 条,共 159 条
标题: Footwear for Gender Recognition
作者: Yuan, Y (Yuan, Yuan); Pang, YW (Pang, Yanwei); Li, XL (Li, Xuelong)
来源出版物: IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY  卷: 20  期: 1  页: 131-135  DOI: 10.1109/TCSVT.2009.2022795  出版年: JAN 2010 
Web of Science 核心合集中的 "被引频次": 9
被引频次合计: 10
摘要: Conventionally, biometrics resources, such as face, gait silhouette, footprint, and pressure, have been utilized in gender recognition systems. However, the acquisition and processing time of these biometrics data makes the analysis difficult. This letter demonstrates for the first time how effective the footwear appearance is for gender recognition as a biometrics resource. A footwear database is also established with reprehensive shoes (footwears). Preliminary experimental results suggest that footwear appearance is a promising resource for gender recognition. Moreover, it also has the potential to be used jointly with other developed biometrics resources to boost performance.
文献类型: Article
作者关键词: Biometrics; footwear; gender recognition; shoes
Web of Science 类别: Engineering, Electrical & Electronic
研究方向: Engineering
IDS 号: 543HX
ISSN: 1051-8215
________________________________________
第 144 条,共 159 条
标题: Deterministic Column-Based Matrix Decomposition
作者: Li, XL (Li, Xuelong); Pang, YW (Pang, Yanwei)
来源出版物: IEEE TRANSACTIONS ON KNOWLEDGE AND DATA ENGINEERING  卷: 22  期: 1  页: 145-149  DOI: 10.1109/TKDE.2009.064  出版年: JAN 2010 
Web of Science 核心合集中的 "被引频次": 30
被引频次合计: 31
摘要: In this paper, we propose a deterministic column-based matrix decomposition method. Conventional column-based matrix decomposition (CX) computes the columns by randomly sampling columns of the data matrix. Instead, the newly proposed method (termed as CX_D) selects columns in a deterministic manner, which well approximates singular value decomposition. The experimental results well demonstrate the power and the advantages of the proposed method upon three real-world data sets.
文献类型: Article
作者关键词: Matrix decomposition; incremental learning; feature extraction; dimensionality reduction
KeyWords Plus: FEATURE-EXTRACTION; FACE RECOGNITION; CLASSIFICATION; FACTORIZATION; SUBSPACE
Web of Science 类别: Computer Science, Artificial Intelligence; Computer Science, Information Systems; Engineering, Electrical & Electronic
研究方向: Computer Science; Engineering
IDS 号: 520NO
ISSN: 1041-4347
________________________________________
第 145 条,共 159 条
标题: Faraday Glasses with a Large Size and High Performance
作者: Li, WN (Li, Weinan); Zou, KS (Zou, Kuaisheng); Lu, M (Lu, Min); Peng, B (Peng, Bo); Zhao, W (Zhao, Wei)
来源出版物: INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY  卷: 7  期: 3  页: 369-374  DOI: 10.1111/j.1744-7402.2008.02344.x  出版年: 2010 
Web of Science 核心合集中的 "被引频次": 3
被引频次合计: 3
摘要: A kind of Faraday glass with a size of 40 mm x 14 mm and 100-300 mm x 25 mm, respectively, was prepared by the melting and casting process, which had neither a Pt particulate nor a bubble or striation. The measurement results showed that the surface homogeneity of the samples was up to +/- 1 x 10-6, the laser threshold reached 10 J/cm2 (1 omega, 3 ns), and the Verdet constants of the glasses were -0.273 min/Oe/cm at 632.8 nm and -0.076 min/Oe/cm at 1064 nm, respectively.
文献类型: Article
KeyWords Plus: REFRACTIVE-INDEX; MAGNETIC-FIELD; OXIDE GLASSES; ROTATION; DEPENDENCE
Web of Science 类别: Materials Science, Ceramics
研究方向: Materials Science
IDS 号: 591HW
ISSN: 1546-542X
________________________________________
第 146 条,共 159 条
标题: Ultrahigh speed all-optical AND logic gate using integrated silicon-based MZI device
作者: Wu, JW (Wu, Jian-Wei)
来源出版物: JOURNAL OF MODERN OPTICS  卷: 57  期: 6  页: 460-465  DOI: 10.1080/09500341003692971  出版年: 2010 
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 device with a silicon-on-insulator (SOI) based symmetrical Mach-Zehnder interferometer (MZI) structure to perform the ultrahigh speed all-optical AND logic gate function. Simulation results show that, while the operation speed is at a bit rate of 200 Gbit s(-1), the output parameters including extinction ratio and eye-opening ratio for outcome AND logic gate signal can, respectively, reach as high as similar to 12.8 dB, and similar to 0.94 in the case of a 5mm long SOI waveguide by means of judiciously adjusting the initial conditions, such as incident signal and probe continuous-wave (CW) powers.
文献类型: Article
作者关键词: integrated optics; silicon-on-insulator technology; Mach-Zehnder interferometer; AND logic gate
KeyWords Plus: INSULATOR WAVE-GUIDES; RAMAN AMPLIFICATION; PHASE MODULATION; AMPLIFIER; XOR; ABSORPTION; GENERATION; PULSES
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 588PP
ISSN: 0950-0340
________________________________________
第 147 条,共 159 条
标题: Efficiency of pump absorption in gain-guided and index-antiguided (GG-IAG) fiber
作者: Yan, KL (Yan, Kun-Lun); Zhou, EY (Zhou, En-Yu); Wei, W (Wei, Wei); Peng, B (Peng, Bo)
来源出版物: JOURNAL OF MODERN OPTICS  卷: 57  期: 6  页: 480-484  DOI: 10.1080/09500341003695610  出版年: 2010 
Web of Science 核心合集中的 "被引频次": 4
被引频次合计: 4
摘要: In this paper, the absorption characteristics of a novel double-clad gain-guided and index-antiguided (GG-IAG) fiber are investigated with 3D ray-trace method. Additionally, the simulated correctness compared with real data was carried out by measuring the GG-IAG fiber. Analysis and experimental results show that the absorption characteristics of GG-IAG fibers are different from conventional fibers: the total absorption efficiency of a GG-IAG fiber is large, while the effective absorption length is very short, and the negative refractive index step has significant influence on the total absorption efficiency.
文献类型: Article
作者关键词: gain-guided index-antiguided (GG-IAG) fiber; 3D ray-trace; absorption characteristics
KeyWords Plus: DOUBLE-CLAD FIBERS
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 588PP
ISSN: 0950-0340
________________________________________
第 148 条,共 159 条
标题: Passive harmonic mode-locking of a fiber laser at controllable repetition rates from fundamental to eighth-order harmonic operation
作者: Liu, XM (Liu, Xueming); Wang, LR (Wang, Leiran); Mao, D (Mao, Dong); Li, XH (Li, Xiaohui)
来源出版物: JOURNAL OF MODERN OPTICS  卷: 57  期: 17  页: 1635-1639  文献号:   DOI: 10.1080/09500340.2010.514364  出版年: 2010 
Web of Science 核心合集中的 "被引频次": 5
被引频次合计: 5
摘要: We have experimentally reported a passively harmonic mode-locked fiber laser at controllable repetition rates. The pulse train is continuously tunable and controllable from the fundamental cavity frequency to the eighth-order harmonic frequency. The pulses in the proposed laser disappear one by one when the pump power is decreased and, at the same time, the remaining pulses self-organize into a new, stable, uniform distribution in the cavity at each state. The experimental results indicate a supermode suppression of more than 40 dB. By appropriately increasing the coupler output ratio and lengthening the laser cavity, the enhanced mutual influence of the global and local soliton interactions induced by the CW components and the dispersive waves plays the key role in separating pulses stably and uniformly in the cavity. Our laser has the potential to generate chirp-free pulses at even higher rates and shorter pulses for use in future time-division multiplexing systems.
文献类型: Article
作者关键词: fiber lasers; mode-locking
KeyWords Plus: RING LASERS; SOLITONS
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 675YP
ISSN: 0950-0340
________________________________________
第 149 条,共 159 条
标题: The Influence of SiO2 Shell on Fluorescent Properties of LaF3:Nd3+/SiO2 Core/Shell Nanoparticles
作者: Kai, C (Kai, Cui); Chao, G (Chao, Gao); Bo, P (Bo, Peng); Wei, W (Wei, Wei)
来源出版物: JOURNAL OF NANOMATERIALS  文献号: 238792  DOI: 10.1155/2010/238792  出版年: 2010 
Web of Science 核心合集中的 "被引频次": 0
被引频次合计: 0
摘要: Distinct effects of the SiO2 shell on fluorescence properties of LaF3:Nd3+/SiO2 core/shell nanoparticles were demonstrated by annealling the nanoparticles at different temperatures. Emission spectra, excitation spectra, and decay curves of the nanoparticles were measured. A significant improvement of fluorescence intensity was observed for LaF3:Nd3+/SiO2 core/shell nanoparticles annealed at 900 degrees C. The phenomenon is ascribed to the change of environment of LaF3:Nd3+ core which is imposed by SiO2 shell. And the change is confirmed by the excitation spectra. It provides a useful way to improve fluorescent intensity of the SiO2-coated LaF3:Nd3+ nanoparticles. The lifetime for nanoparticles annealed at 900 degrees C shows a slight decrease contrast with nanoparticles annealed at 400 and 600 degrees C. This is caused by the higher phonon energy of SiO2 than that of LaF3.
文献类型: Article
KeyWords Plus: DOPED LAF3 NANOPARTICLES; NANOCRYSTALS; LUMINESCENCE; ER3+
Web of Science 类别: Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
研究方向: Science & Technology - Other Topics; Materials Science
IDS 号: 698IX
ISSN: 1687-4110
________________________________________
第 150 条,共 159 条
标题: Effect of structural modifications on the switching voltage of a holographic polymer-dispersed liquid crystal lattice
作者: Milavec, J (Milavec, J.); Devetak, M (Devetak, M.); Li, J (Li, J.); Rupp, RA (Rupp, R. A.); Yao, B (Yao, B.); Drevensek-Olenik, I (Drevensek-Olenik, I.)
来源出版物: JOURNAL OF OPTICS  卷: 12  期: 1  文献号: 015106  DOI: 10.1088/2040-8978/12/1/015106  出版年: JAN 2010 
Web of Science 核心合集中的 "被引频次": 0
被引频次合计: 0
摘要: The effect of temperature-induced variations of the nematic director field on the switching voltage of a 2D square holographic polymer-dispersed liquid crystal (HPDLC) lattice was investigated for a mixture prepared from UV-curable commercially available constituents. At temperatures far below the nematic-isotropic phase transition, the switching voltage is governed by the domain structure of the director field, while at temperatures close to the phase transition it is governed by elastic and dielectric properties of the liquid crystal (LC) material. The crossover occurs at the temperature at which a thin interface region between the LC domains and the polymer pilasters is melted into the isotropic phase. We also performed a comparative study of the square lattices recorded with the use of four and three coherent beams and resolved numerous differences in their structural and switching properties that arise from different spatial profiles of the associated interference fields.
文献类型: Article
作者关键词: polymer-dispersed liquid crystals; holographic lithography; photonic crystal; 2D square lattice
KeyWords Plus: TRANSMISSION GRATINGS; TEMPERATURE-DEPENDENCE; PHOTONIC CRYSTALS; PHOTOPOLYMERIZATION; PERFORMANCE; MORPHOLOGY; MONOMER; FILMS; MIXTURES; KINETICS
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 540PD
ISSN: 2040-8978


第 151 条,共 159 条
标题: A novel erbium/ytterbium co-doped distributed feedback fiber laser with sing le-polarization and unidirectional output
作者: Li, XH (Li, X. H.); Liu, XM (Liu, X. M.); Gong, YK (Gong, Y. K.); Sun, HB (Sun, H. B.); Wang, LR (Wang, L. R.); Lu, KQ (Lu, K. Q.)
来源出版物: LASER PHYSICS LETTERS  卷: 7  期: 1  页: 55-59  DOI: 10.1002/lapl.200910100  出版年: JAN 2010 
Web of Science 核心合集中的 "被引频次": 42
被引频次合计: 42
摘要: An asymmetrical pi-phase-shift distributed feedback (DFB) fiber laser written in erbium/ytterbium co-doped fiber is fabricated. A new self-injection locking method is employed to make the proposed DFB fiber laser operate in single polarization states, which is composed of a polarization-dependent isolator and an optical circulator. The output character is investigated. 9.5 mW of the backward output power is obtained at the 1,59 mW pump power. The output power in one side is much higher than that in the other side, indicating that the DFB fiber laser operates ill the unidirectional output. The delayed self-homodyne measurement is employed to detect the radio frequency spectrum of the DFB fiber laser. This novel single polarization DFB fiber laser has the potential application in the fiber optical sensor and optical communications.
[GRAPHICS]
The RF spectrum of free running DFB fiber laser by using the delayed self-homodyne measurement (C) 2010 by Astro Ltd. Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA
文献类型: Article
作者关键词: erbium/ytterbium co-doped distributed feedback fiber lasers; self-injection locking; unidirectional output; single-polarization
KeyWords Plus: INJECTION LOCKING; SENSING APPLICATIONS; BRAGG-REFLECTOR; DFB LASERS; FREQUENCY; SYSTEMS; DESIGN
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 547HR
ISSN: 1612-2011
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第 152 条,共 159 条
标题: Giant-chirp oscillator for ultra-large net-normal-dispersion fiber lasers
作者: Wang, LR (Wang, L. R.); Liu, XM (Liu, X. M.); Gong, YK (Gong, Y. K.)
来源出版物: LASER PHYSICS LETTERS  卷: 7  期: 1  页: 63-67  DOI: 10.1002/lapl.200910109  出版年: JAN 2010 
Web of Science 核心合集中的 "被引频次": 57
被引频次合计: 58
摘要: We report oil the experimental observations for giant-chirped dissipative solitons emitted from a passively mode-locked fiber laser, which has ultra-large normal cavity dispersion. Two types of solitons coexist in the same cavity and evolve with different spectrum shape, one of which is exhibited as a rectangular-spectrum profile and the other is as a bell-spectrum profile. Both are highly chirped due to the positively nonlinear effect together with strong nor-mat dispersion. The maximal time-bandwidth product of solitons reported here can be its large as 236.3, which is far larger than 0.315 for (he classical solitons. The dynamic evolution of solitons versus pump power is demonstrated. The experimental results suggest that the nonlinear polarization rotation and the gain filtering effect dominate the pulse-shaping alternately, which lead to the spectrum profile transforming. With further increasing the pump power, the proposed laser emits multiple pulses one by one, and the number of pulses can be up to five at the pump power of similar to 505 mW.
[GRAPHICS]
The blue and red lines show the bell-spectrum of the pulses for P = 86 mW and 139 mW, respectively (C) 2010 by Astro Ltd. Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA
文献类型: Article
作者关键词: dissipative solitons; chirp; gain filtering
KeyWords Plus: NONLINEAR POLARIZATION ROTATION; DOPED FIBER; ALL-FIBER; PULSE-PROPAGATION; SOLITONS; AMPLIFIERS
Web of Science 类别: Optics; Physics, Applied
研究方向: Optics; Physics
IDS 号: 547HR
ISSN: 1612-2011
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第 153 条,共 159 条
标题: SOA-based actively mode-locked fiber ring laser by forward injecting an external pulse train
作者: Yan, SY (Yan, Shuangyi); Zhang, JG (Zhang, Jian-Guo); Zhao, W (Zhao, Wei)
来源出版物: OPTICS COMMUNICATIONS  卷: 283  期: 1  页: 87-92  DOI: 10.1016/j.optcom.2009.09.032  出版年: JAN 1 2010 
Web of Science 核心合集中的 "被引频次": 5
被引频次合计: 5
摘要: An actively mode-locked fiber ring laser based on cross-gain modulation (XGM) in a semiconductor optical amplifier (SOA) is demonstrated to operate stably with a simple configuration. By forward injecting an easily-generated external pulse train, the mode-locked fiber laser can generate an optical-pulse sequence with pulsewidth about 6 ps and average output power about 7.9 mW. The output pulses show an ultra-low RMS jitter about 70.7 fs measured by a RF spectrum analyzer. The use of the proposed forward-injection configuration can realize the repetition-rate tunability from I to 15 GHz for the generated optical-pulse sequences. By employing a wavelength-tunable optical band-pass filter in the laser cavity, the operation wavelength of the designed SOA-based actively mode-locked fiber laser can be tuned continuously in a wide span between 1528 and 1565 nm. The parameters of external-injection optical pulses are studied experimentally to optimize the mode-locked fiber laser. (C) 2009 Elsevier B.V. All rights reserved.
文献类型: Article
KeyWords Plus: OPTICAL-COMB INJECTION; SEMICONDUCTOR-LASERS; 10 GHZ; AMPLIFIER; LOCKING
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 528GD
ISSN: 0030-4018
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第 154 条,共 159 条
标题: One-dimensional steady-state bright photovoltaic solitons in LiNbO3:Fe crystal with background illumination
作者: Zhang, MZ (Zhang, Meizhi); Lu, KQ (Lu, Keqing); Cheng, GH (Cheng, Guanghua); Zhang, YQ (Zhang, Yiqi); Li, KH (Li, Kehao); Zhang, L (Zhang, Lei); Zhang, YP (Zhang, Yanpeng)
来源出版物: OPTIK  卷: 121  期: 6  页: 575-580  DOI: 10.1016/j.ijleo.2008.09.020  出版年: 2010 
Web of Science 核心合集中的 "被引频次": 4
被引频次合计: 4
摘要: We investigate theoretically and experimentally one-dimensional bright photovoltaic solitons in LiNbO3:Fe crystal by use of the background illumination. We find that, in LiNbO3:Fe crystal, bright photovoltaic solitons can be obtained with background illumination for kappa>1, where K is the ratio of the background illumination photovoltaic constant to the soliton optical beam's photovoltaic constant. For kappa<1, dark photovoltaic solitons are generated. On the other hand, our experiments show good agreement with theoretical prediction for the soliton existence curve in a special intensity ratio. Crown Copyright (c) 2008 Published by Elsevier GmbH. All rights reserved.
文献类型: Article
作者关键词: Nonlinear optics; Photorefractive effect; Photovoltaic constant; Self-defocusing; Self-focusing
KeyWords Plus: PHOTOREFRACTIVE SCREENING SOLITONS; DARK SPATIAL SOLITONS; WAVE-GUIDES; MEDIA; INTENSITY; FIELD
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 582QO
ISSN: 0030-4026
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第 155 条,共 159 条
标题: Theoretical analysis of the heat dissipation mechanism in high power photonic crystal fiber lasers
作者: Li, JF (Li, Jianfeng); Duan, KL (Duan, Kailiang); Dai, ZY (Dai, Zhiyong); Ou, ZH (Ou, Zhonghua); Liu, Y (Liu, Yong); Liu, YZ (Liu, Yongzhi)
来源出版物: OPTIK  卷: 121  期: 13  页: 1243-1250  DOI: 10.1016/j.ijleo.2009.01.015  出版年: 2010 
Web of Science 核心合集中的 "被引频次": 2
被引频次合计: 3
摘要: Starting from the special structure of photonic crystal fiber (PCF), the heat dissipation model of a PCF laser is constructed. Based on the heat dissipation model, the temperature distributions along the radial and axial directions of the PCF (DC-Yb-17040) for forward pump of 200 W and two-end pump of 100 W each side are calculated numerically by using the finite element method (FEM). The results show that the temperature distribution for two-end pump mode is more even than that for forward pump mode and the maximum temperature in the fiber decreases by 178.16 degrees C. With the thermal power in fiber core being assumed to be fixed, the effects of the core radius, outer cladding radius, and air-clad width on the temperature distribution along the fiber are analyzed numerically. The results show that the changing of core radius only affects the temperature in core region slightly and the decreasing of air-clad width decreases the temperature in inner cladding and core regions effectively. Meanwhile, the temperature of the whole fiber can be decreased by increasing the cladding radius. (C) 2009 Elsevier GmbH. All rights reserved.
文献类型: Article
作者关键词: High power fiber lasers; PCFs; Heat dissipation; Heat equations; Temperature distribution
KeyWords Plus: AMPLIFIERS; OUTPUT
Web of Science 类别: Optics
研究方向: Optics
IDS 号: 630NY
ISSN: 0030-4026
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第 156 条,共 159 条
标题: Modelling and simulation of a two-axis tracking system
作者: Zhao, ZM (Zhao, Z. M.); Yuan, XY (Yuan, X. Y.); Guo, Y (Guo, Y.); Xu, F (Xu, F.); Li, ZG (Li, Z. G.)
来源出版物: PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART I-JOURNAL OF SYSTEMS AND CONTROL ENGINEERING  卷: 224  期: I2  页: 125-137  DOI: 10.1243/09596518JSCE830  出版年: 2010 
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, the modelling and simulation of a two-axis tracking system are introduced. First, dynamic modelling of a two-axis tracking system that is based on the Lagrange-Maxwell dynamic equation is presented. According to the established dynamic equation the coupling of system velocity and the inertia characteristics between the two axes are analysed. Then, the controller of the tracking system is designed using the inverse system method. Based on a certain type two-axis tracking system, the simulation is then made with MATLAB/Simulink, which includes position tracking and tracking error analysis. The simulation using Adams and Simulink is also presented. A comparison of the results from the two kinds of simulation indicates that the modelling of the two-axis tracking system is reasonable and the simulation results are rational.
文献类型: Article
作者关键词: electromechanical modelling; coupling dynamics; inverse system method; two-axis tracking system
KeyWords Plus: PLATFORMS
Web of Science 类别: Automation & Control Systems
研究方向: Automation & Control Systems
IDS 号: 594PH
ISSN: 0959-6518
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第 157 条,共 159 条
标题: Spectrum Recovery Method for Interferometric Data
作者: Lu, QB (Lue Qun-bo); Yao, T (Yao Tao); Xiangli, B (Xiangli Bin); Huang, M (Huang Min)
来源出版物: SPECTROSCOPY AND SPECTRAL ANALYSIS  卷: 30  期: 1  页: 114-117  DOI: 10.3964/j.issn.1000-0593(2010)01-0114-04  出版年: JAN 2010 
Web of Science 核心合集中的 "被引频次": 7
被引频次合计: 7
摘要: The interferometric data acquired by Fourier transform spectrometer was a betweenness which couldn't be used directly. For the successful application of the interferometric data, spectrum recovery processing must be adopted. The conventional method based on inverse Fourier transform was frequently used for spectrum recovery. According to the principle analysis of the interferometric data, the mixing model was induced, and the spectrum recovery method based on the mixing model of the interferometric data was presented. Finally, the computer simulation for these two methods mentioned above was implemented, and the recovered spectra were compared with the standard spectrum. The simulation results indicated that the spectral precision of the new method was better than the conventional method, which provided a new scheme for spectrum recovery.
文献类型: Article
作者关键词: Interferometric data; Spectrum recovery; Mixing model
KeyWords Plus: FOURIER-TRANSFORM SPECTROMETERS; SPECTROSCOPY
Web of Science 类别: Spectroscopy
研究方向: Spectroscopy
IDS 号: 539CH
ISSN: 1000-0593
________________________________________
第 158 条,共 159 条
标题: Modeling and Simulation of Effect of Optical Distortion on the Large Aperture Static Imaging Spectrometer
作者: Lu, QB (Lue Qun-bo); Xiangli, B (Xiangli Bin); Yao, T (Yao Tao); Jing, JJ (Jing Juan-juan); Wang, ZH (Wang Zhong-hou)
来源出版物: SPECTROSCOPY AND SPECTRAL ANALYSIS  卷: 30  期: 1  页: 142-145  DOI: 10.3964/j.issn.1000-0593(2010)01-0142-04  出版年: JAN 2010 
Web of Science 核心合集中的 "被引频次": 2
被引频次合计: 2
摘要: As a new type Fourier transform imaging spectrometry, large aperture static imaging spectrometry (LASIS) has come forth in recent years, which has many advantages such as simple principle, high stability and so on. However, the requirement for the optical system design of LASIS was very harsh. As one of the optical aberrations, optical distortion degrades the data quality acquired by LASIS, consequently limits its applications. According to the analysis of the data acquisition principle of LASIS, the data model with the effect of optical distortion was presented, which could be used for LASIS performance pre-evaluation. Finally, the computer simlulation of the data model was achieved with supposed parameters. The simulation results indicated that the relative error more than 5% was induced in the recovery spectrum, and approximate 8 nm spectral line deviation was occurred at the long wavelength region. The results show that the 4% optical distortion was inapplicable for LASIS although it is acceptant for common optical imaging system.
文献类型: Article
作者关键词: Imaging spectrometry; Large aperture; Optical system; Optical distortion; Computer simulation
KeyWords Plus: SPECTROSCOPY
Web of Science 类别: Spectroscopy
研究方向: Spectroscopy
IDS 号: 539CH
ISSN: 1000-0593
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第 159 条,共 159 条
标题: Spatially Modulated Fourier Transform Imaging Spectrometer Data Compression Research
作者: Huang, M (Huang Min); Xiangli, B (Xiangli Bin); Yuan, Y (Yuan Yan); Shen, Z (Shen Zhong); Lu, QB (Lue Qun-bo); Wang, ZH (Wang Zhong-hou); Liu, XB (Liu Xue-bin)
来源出版物: SPECTROSCOPY AND SPECTRAL ANALYSIS  卷: 30  期: 1  页: 278-282  DOI: 10.3964/j.issn.1000-0593(2010)01-0278-05  出版年: JAN 2010 
Web of Science 核心合集中的 "被引频次": 0
被引频次合计: 0
摘要: Fourier transform imaging spectrometer is a new technic, and has been developed very fast in recent ten years. When it is used in satellite, because of the limit by the data transmission, the authors need to compress the original data obtained by the Fourier transform imaging spectrometer, then, the data can be transmitted, and can be incepted on the earth and decompressed. Then the authors can do data process to get spectrum data which can be used by user. Data compression technic used in Fourier transform imaging spectrometer is a new technic, and few papers introduce it at home and abroad. In this paper the authors will give a data compression method, which has been used in EDIS, and achieved a good result.
文献类型: Article
作者关键词: Spatial modulation; Fourier transform imaging spectrometer; Data compression
Web of Science 类别: Spectroscopy
研究方向: Spectroscopy
IDS 号: 539CH

 

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