2024

• Record 373 of
  
  Title:Spectroscopic properties and numerical analysis of novel erbium doped multi-component tellurite glasses
  
  Author(s):Wan, Rui(1,2); Guo, Chen(1,2); Li, Xianda(1,2); Wang, Pengfei(1,2)
  Source: Ceramics International  Volume: 50  Issue: 4  DOI: 10.1016/j.ceramint.2023.12.085  Published: February 15, 2024  
  Abstract:In this paper, Er3+ doped TeO2-ZnF2-BaF2-KF-Ta2O5 tellurite glasses with low hydroxyl content (∼0.03 × 10−19 cm−3) were investigated employing both glass composition and glass melting process optimization. The Raman spectra and physical properties were characterized to analyze the structure of the glasses. Under the pumping of 980 nm LD laser, intense up-conversion fluorescence at 1.5 and 2.7 μm of samples and their lifetimes were detected and analyzed, and the related transition mechanisms with gradient-varying Er3+ doping concentrations were discussed. The maximum absorption and emission cross section at 2.7 μm was calculated to be 6.4 × 10−21 cm2 and 6.8 × 10−21 cm2, correspondingly, which were higher than those of traditional tellurite glasses. Using the calculated and measured spectroscopic parameters of bulk tellurite glass, a dual-wavelength pumping model was established to verify the feasibility of mid-infrared laser output in similar tellurite glass fiber. Experimental results support the assertion that the Er3+ doped tellurite glasses hold promise as a candidate laser gain medium for mid-infrared fiber laser systems. © 2023 Elsevier Ltd and Techna Group S.r.l.
  Accession Number: 20235215291178
• Record 374 of
  
  Title:Observation of three kinds of bound solitons in a black phosphorus-based erbium fiber laser
  
  Author(s):Li, Wenlei(1,2); Lin, Ruping(1); Chen, Guangwei(3); Geng, Gaoli(1); Xu, Peng(1); Yang, Yining(1); Wang, Xinliang(1); Xu, Jian(1)
  Source: Optical Fiber Technology  Volume: 82  Issue:   DOI: 10.1016/j.yofte.2023.103617  Published: January 2024  
  Abstract:We describe the experimental finding of three kinds of bound solitons in the Erbium-doped fiber lasers based on saturable absorber of black phosphorus. The passively mode-locked laser can obtain stretched-pulse state, double-pulse and four-pulse bound state with the sech2-shaped pulse profile. The laser can also realize Lorentzian autocorrelation trace with the duration of approximately 562 fs and deliver Lorentzian double-pulse bound state with pulse separations of approximately 5.04 ps by properly adjusting the polarization state. This project demonstrates that the same fiber laser can obtain different types of bound state pulses, which lays a foundation for further research into bound state pulses. © 2023 Elsevier Inc.
  Accession Number: 20234915153781
• Record 375 of
  
  Title:High refractive index chalcogenide polymer-based planar refractive microlens components
  
  Author(s):Liu, Feng(1); Zhang, Jiawei(1); Guo, Zhaojin(1); Zhou, Liang(1); Li, Xianda(2); Lei, Xiaowei(1); Ji, Ruonan(1); Zhang, Jiwei(1); Li, Peng(1); Liu, Sheng(1); Zhu, Xiangping(2); Zhao, Jianlin(1)
  Source: Optics and Lasers in Engineering  Volume: 178  Issue:   DOI: 10.1016/j.optlaseng.2024.108200  Published: July 2024  
  Abstract:Planar microlens components are highly desired in micro-systems for their compactness and ability to integrate with other planar elements. In this paper, we propose an alternative facile approach to producing positive planar microlens components by infilling concave microlens featured glass encapsulation with high refractive index chalcogenide polymer. The presented refractive microlens components have several advantages: cost-efficient to process, high transmission in broadband spectrum, the ability to generate real focus and real image, and being well-protected by its planar glass encapsulation. Both single and arrayed samples were fabricated to demonstrate the effectiveness of the manufacturing process. The optical properties of the fabricated samples, including phase modulation, imaging performance, and spectrally operational region, were thoroughly characterized. Wavefront calibration with the prepared sample revealed its potential application in practical engineering fields. © 2024 Elsevier Ltd
  Accession Number: 20241415840977
• Record 376 of
  
  Title:Low self-starting threshold polarization-maintaining Er-doped fiber optical frequency comb
  
  Author(s):Gao, Yanwei(1); Cheng, Haihao(2); Hu, Xiaohong(2); Li, Yongqi(1); Liu, Hao(1); Yang, Yanzhao(3); Pan, Ran(2); Wang, Yishan(2); Wu, Shun(1)
  Source: Optics and Laser Technology  Volume: 177  Issue:   DOI: 10.1016/j.optlastec.2024.111092  Published: October 2024  
  Abstract:We report the development of an all-fiber polarization maintaining (PM) optical frequency comb using a mode-locked figure-9 laser with a low self-starting pump threshold. We have achieved self-starting mode-lock for repetition rates (fr) from 70 MHz to 109 MHz. At a repetition rate of 109 MHz, mode-locking can be achieved for a pump power ranging from 187 mW to 880 mW. To the best of our knowledge, this is the lowest pump power reported for PM figure-9 erbium fiber lasers with repetition rate over 100 MHz. By optimizing the pump power to 238 mW, we have achieved an output power of 5 mW, center wavelength of 1566.2 nm, and 3-dB spectral bandwidth of 20.5 nm. The repetition rate has a high signal-to-noise ratio of 95 dB at a resolution bandwidth of 300 Hz. We have studied the spectral characteristics of the laser under different cavity lengths and pump powers. Additionally, we have stabilized the repetition rate using a GPS-Rb disciplined RF reference. The fractional instability of the repetition rate is measured to be 4.67×10-12 at 1 s and 9.22×10-13 at 10 s over a measurement of 11 h. Our findings demonstrate that the developed figure-9 comb is robust, compact and has the advantage of high stability and low power consumption. It offers a cost effective solution for future outdoor comb applications. © 2024
  Accession Number: 20241916030777
• Record 377 of
  
  Title:O-band reconfigurable silicon polarization rotator
  
  Author(s):Bai, Yawen(1,2); Wang, Pengfei(1,2); Peng, Bo(1,2); Chu, Tao(3)
  Source: Chinese Optics Letters  Volume: 22  Issue: 1  DOI: 10.3788/COL202422.011303  Published: January 10, 2024  
  Abstract:Silicon waveguides typically exhibit optical anisotropy, which leads to polarization correlation and single-polarization operations. This consequently creates a demand for polarization-control devices. This paper introduces a CMOS-compatible O-band reconfigurable TE/TM polarization rotator comprising two symmetrical polarization rotator-splitters and phase shifters. This configuration enables dynamic conversion of any linear polarization to its quadratic equivalent. Experimental results indicate that the reconfigurable polarization rotator exhibits an insertion loss of less than 1.5 dB. Furthermore, the bandwidth for a polarization extinction ratio beyond 15 dB exceeds 60 nm. © 2024 Chinese Optics Letters.
  Accession Number: 20241715949098
• Record 378 of
  
  Title:Process optimization of infrared chalcogenide glass based on the scattering detection
  
  Author(s):Tang, Yuxin(1,2); Xu, Yantao(1,2); Cui, Xiaoxia(1,2); Zhang, Jinchang(1,2); Li, Man(3); Xiao, Xusheng(1,2); Yan, Mengmeng(3); Guo, Haitao(1,2,3)
  Source: Ceramics International  Volume: 50  Issue: 5  DOI: 10.1016/j.ceramint.2023.12.020  Published: March 1, 2024  
  Abstract:Chalcogenide glasses with less optical losses are highly demanded as optical materials for micro lense, waveguide and fiber devices. However, it is still challengeable to reduce the optical losses in infrared chalcogenide glasses with opaque visible light. Herein, an improved 3D distribution of scattering sources is established in this study to test and compare the concentration and distribution of defects in As38S62, Ge28Sb12Se60 and As40Se60 chalcogenide glasses. Furthermore, by comparing the scattering images of serial As40Se60 glass prepared under various melting, quenching and annealing temperatures, the preparation process was optimized to reduce its scattering loss. In addition, this study introduced a scheme that could be widely applied to optimize processing of other infrared glasses and devices glass to reduce their scattering losses. © 2023 Elsevier Ltd and Techna Group S.r.l.
  Accession Number: 20235215279498
• Record 379 of
  
  Title:Gain-switched 3 μm dysprosium-doped fluoride fiber laser pumped at 1.7 μm
  
  Author(s):Xiao, Yang(1,2); Xiao, Xusheng(1,2); He, Chunjiang(3); He, Yuxuan(1,2); Guo, Haitao(1,2)
  Source: Optics and Laser Technology  Volume: 169  Issue:   DOI: 10.1016/j.optlastec.2023.110162  Published: February 2024  
  Abstract:To the best of our knowledge, we demonstrated a gain-switched 3 μm dysprosium-doped fluoride fiber laser pumped by a 1706.5 nm pulsed thulium-doped fiber master oscillator power amplifier for the first time. The maximum average power of the 3 μm pulsed laser was 50 mW with a slope efficiency of 12.3%, a repetition rate of 100 kHz, and a pulse width of 283 ns. This work exhibits the potential of 1.7 μm pulse pumped dysprosium-doped fluoride fiber laser as a platform for developing pulsed sources in the 3 μm region. © 2023 Elsevier Ltd
  Accession Number: 20234114855661
• Record 380 of
  
  Title:Scale and pattern adaptive local binary pattern for texture classification[Formula presented]
  
  Author(s):Hu, Shiqi(1,2); Li, Jie(1); Fan, Hongcheng(3); Lan, Shaokun(1); Pan, Zhibin(1,4)
  Source: Expert Systems with Applications  Volume: 240  Issue:   DOI: 10.1016/j.eswa.2023.122403  Published: April 15, 2024  
  Abstract:Local binary pattern (LBP) with a fixed sampling template is sensitive to scale changes. Furthermore, under rotation changes or noise corruptions, one uniform LBP pattern can be corrupted to fall into a non-uniform pattern which loses its discrimination power to describe the corresponding texture feature. To overcome these two main drawbacks, we propose a scale and pattern adaptive local binary pattern (SPALBP). Firstly, in the gradient-based sampling radius adaptive scheme, eight directional adaptive sampling radius of each center pixel can be obtained by using its eight Kirsch gradient values. Secondly, in the noise and rotation robust neighborhood sampling scheme, three neighborhood sampling templates are used to extract three kinds of averaging neighborhood pixels. Thirdly, for each center pixel, three kinds of LBPriu2 patterns can be extracted by sampling these three kinds of averaging neighborhood pixels along eight directional adaptive sampling radius. Finally, an optimal SPALBP uniform pattern can be adaptively selected from these three LBPriu2 patterns. Hence, all SPALBP patterns show more robustness against scale changes, rotation changes and noise corruptions. Extensive experiments are conducted on four standard texture databases: Outex, UIUC, CUReT and XU_HR. Comparing with state-of-the-art LBP-based variants, the proposed SPALBP method consistently shows superior performance both in dramatic environment changes and high-levels of noise conditions, meanwhile it maintains a lower texture feature dimension. © 2023 Elsevier Ltd
  Accession Number: 20240215355772
• Record 381 of
  
  Title:Heterostructure nanocluster MOF-derived Ag-CuO: An emerging material for harmonic soliton pulses generation
  
  Author(s):Luo, Wenfeng(1); Sun, Penghuan(2); Wu, Ziyan(1); Ban, Xiaoqiang(3,4); Zhang, Tingting(1); Zhao, Yang(2); Li, Xiaohui(2); Yu, Xuechao(5); Shan, Guangcun(6); Zhao, Xiaoxia(7)
  Source: Infrared Physics and Technology  Volume: 136  Issue:   DOI: 10.1016/j.infrared.2023.105052  Published: January 2024  
  Abstract:In recent years, metal-organic framework (MOF) and their derivatives have attracted many researchers due to excellent characteristics, such as good stability, high capacity, and a modest third order nonlinear optical response. Compared with conventional optical materials, MOF-oxide are easier to benefit photonic research. However, for nonlinear optics and ultrafast photonics, research on MOFs-Transition metal oxide is still in its infancy. In this work, MOF-derived Ag-CuO was prepared by hydrothermal method and applied in passively mode-locked fiber laser. Experimental results show that MOF-derived Ag-CuO possesses excellent optical absorption, functioning as a saturable absorber (SA). The laser based on MOF-derived Ag-CuO SA realizes three different mode-locking states, including traditional soliton with the pulse width of 1.04 ps, 32nd order harmonic soliton molecule, and soliton rain pulse, with the signal-to-noise ratio (SNR) of 73 dB. This work lays the foundation of its application in ultrashort photonics and optical communication, broadening the future of MOF-derived Ag-CuO. © 2023 Elsevier B.V.
  Accession Number: 20240115315279
• Record 382 of
  
  Title:Power-Guided Asymmetrical Vector Dissipative Soliton Molecules in a Compact Fiber Resonator
  
  Author(s):Huang, Xiangzhen(1); Li, Xiaohui(1); Chen, Enci(2); Pan, Zhiwen(1); Guo, Penglai(3); Sun, Liaoxin(4); Wang, Yishan(5); Zhao, Wei(5)
  Source: IEEE Journal of Selected Topics in Quantum Electronics  Volume: 30  Issue: 5  DOI: 10.1109/JSTQE.2023.3319342  Published: September 1, 2024  
  Abstract:Vector dissipative soliton molecules (VDSMs) can be promising for polarization multiplexing transmission applications. We report a nonlinear polarization rotation (NPR) vector dissipative soliton molecule laser. The laser realizes three-type vector dissipative soliton molecules of directly generated '1+2' type, '2+2 type, and outer-cavity projected super-position '2+'2+2'' type just by changing the pump power. It's proved that the different generated methods of vector soliton molecules in Hamiltonian systems can also be realized in dissipative systems. This is also the first time that multiple different generated methods of vector dissipative soliton molecules are realized in a fiber resonator based on NPR. The results proved the VDSMs' structures can be controlled, which can be potentially applied in optical frequency comb, optical communication systems, optical logic processing, optical detection, etc. © 1995-2012 IEEE.
  Accession Number: 20234114860851
• Record 383 of
  
  Title:A 90Sr/90Y-radioisotope battery based on betavoltaic and beta-photovoltaic dual effects
  
  Author(s):Cui, Qiming(1); Lu, Jingbin(1); Li, Xiaoyi(1); Yuan, Xinxu(1); Zhao, Yang(1); Zheng, Renzhou(2); Li, Qingyang(1); Wei, Jie(3); Luo, Baifeng(3); Lin, Li(4)
  Source: Materials Science in Semiconductor Processing  Volume: 179  Issue:   DOI: 10.1016/j.mssp.2024.108493  Published: August 15, 2024  
  Abstract:Betavoltaic batteries with strontium sources are expected to achieve higher output power because of their high energy density and low self-absorption rate with the development of MEMS. However, the high energy of beta particles emitted from 90Sr/90Y can prone to radiation damage of the semiconductor. In order to exploit the high energy of beta particles emitted from 90Sr/90Y and to avoid radiation damage to the semiconductor, this paper presents a 90Sr/90Y-radioisotope battery based on betavoltaic (BV) and beta-photovoltaic (BPV) dual effects. In the work, the energy deposition of beta particles in LYSO:Ce and GaAs was simulated by Monte Carlo code, and thickness of the scintillator was determined. And the doping concentrations and junction depth of semiconductor were optimized based on the theoretical calculations to obtain the best output performance of device. When the thickness of LYSO:Ce is 0.158 cm, the output power density Pm of the optimized dual-effect battery is 0.61 μW/cm2. And the conversion efficiency of the device is 0.92%. At this time, the doping concentrations are Na=1.58×1017 cm−3 and Nd=3.16×1018 cm−3, and the junction depth xj=0.05 μm. All calculated parameter values are considered as theoretical limit values. In addition, the contribution of BV effect and BPV effect to the output performance of the dual-effect radioisotope battery was investigated. Different scintillator thicknesses lead to different percentages of the two mechanics. In addition, the BV effect and BPV effect output proportion is also affected by the average energy of the radiation source. In the case that the average electron energy on the semiconductor surface is 0.27 MeV, the higher the radioactive source energy, the thicker the scintillator is required, resulting in more BPV effect and less BV effect. © 2024 Elsevier Ltd
  Accession Number: 20241916067573
• Record 384 of
  
  Title:Cold shield matching of cooled infrared system based on telecentric optical structure
  
  Author(s):Hu, Xinrong(1); Wang, Jing(1); Chen, Su(1); Li, Jing(2); Feng, Ye(2)
  Source: Proceedings of SPIE - The International Society for Optical Engineering  Volume: 13104  Issue:   DOI: 10.1117/12.3023902  Published: 2024  
  Abstract:To solve the problem of cold shield matching in a cooled infrared (IR) imaging optical system with aperture stop placed away from the lens, a pupil matching method based on the telecentric optical structure is proposed. The formulae of Gaussian parameters between the relay lens and the objective lens are derived by using the ideal imaging process. A specific discussion and numerical analysis are carried out. The objective lens is designed as image-space telecentric and the relay lens is designed as object-space telecentric to achieve the requirement that the aperture stop far away from the objective lens. And a specific designing example is added to show the effectiveness of the analysis. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.
  Accession Number: 20241816027603