2024

• Record 121 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 122 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 123 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 124 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 125 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 126 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
• Record 127 of
  
  Title:Ultrahigh sensitivity terahertz refractive index sensor based on four-inscribed hole defect photonic crystal structure
  
  Author(s):Wen, Jin(1,2); Sun, Wei(1); Liang, Bozhi(1); He, Chenyao(1); Xiong, Keyu(1); Wu, Zhengwei(1); Zhang, Hui(1); Yu, Huimin(1); Wang, Qian(1)
  Source: Microwave and Optical Technology Letters  Volume: 66  Issue: 1  DOI: 10.1002/mop.33892  Published: January 2024  
  Abstract:We proposed and investigated an ultrahigh sensitivity terahertz (THz) refractive index sensor based on four-inscribed hole defect photonic crystal structure. Due to the formation of resonant modes, the sensing properties can be obtained by shifting the sharp resonance in the transmission spectrum as changing of the analyte refractive index. In addition, the influence of structure parameters on the sensing performance is explored and demonstrated numerically. The numerical results illustrate that the Q-factor and figure of merit reach 323.71 and 167.188 can be obtained under the optimized structural parameters. In particular, an ultrahigh sensitivity of 198.8 μm/RIU can be realized in the frequency range of 0.777–0.779 THz. The proposed sensor may find significant applications in biochemical sensing systems. © 2023 Wiley Periodicals LLC.
  Accession Number: 20233814748894
• Record 128 of
  
  Title:The temperature variation of different cooling methods for the preparation of chalcogenide glasses
  
  Author(s):Fan, Wenwen(1); Xu, Junfeng(1); Yao, Zhirui(1); Li, Na(1); Li, Xuyang(2)
  Source: Infrared Physics and Technology  Volume: 136  Issue:   DOI: 10.1016/j.infrared.2023.105083  Published: January 2024  
  Abstract:The cooling rate has a great influence on the performance of chalcogenide glass, but it is unclear how much the actual cooling rate changes with different cooling methods. In this study, the infrared thermal imaging technology was employed to observe the temperature change in various cooling methods. The temperature curves and the cooling rates between different cooling methods were analyzed from the infrared images. The results show that at 250 °C, the cooling rates follow the order: water quenching > air compressor cooling > salt bath cooling > air cooling > asbestos wrapping cooling; whereas at 150 °C, the sequence is: water quenching > air compressor cooling > air cooling > asbestos wrapping cooling > salt bath cooling. Then the temperature changes inside the sample was simulated and the result shows that the temperature gradient of water quenching is much greater than that of air cooling method, which is why cracks often appear in the glass prepared by water quenching. Finally, Gex-S(90-x)-Sb10 glass was successfully prepared using the air cooling method and it shows excellent optical properties that can transmit both visible and infrared light. © 2023 Elsevier B.V.
  Accession Number: 20240115321626
• Record 129 of
  
  Title:Underwater Blue-green Light Weak Signal Detection Based on Adaptive Stochastic Resonance
  
  Author(s):Zhang, Jianlei(1); Zhang, Juan(1); Zhu, Yunzhou(2); Yao, Xinyu(1); Wu, Qianqian(1); Yang, Yi(1); He, Fengtao(1)
  Source: Guangzi Xuebao/Acta Photonica Sinica  Volume: 53  Issue: 3  DOI: 10.3788/gzxb20245303.0301003  Published: March 2024  
  Abstract:The optical signal is easy to be absorbed and scattered during transmission with Underwater Optical Wireless Communication（UWOC）technology，resulting in serious optical power attenuation and further affecting the signal quality. In order to realize long-distance data transmission，it is very important to recognize，enhance and extract weak light signal under low Signal-to-Noise Ratio（SNR）. Stochastic resonance produces synergistic effect through nonlinear system，weak driving signal and appropriate amount of noise under certain conditions，which not only improves the output signal-to-noise ratio，but also detects useful signals. However，the current parameter selection of stochastic resonance system depends on artificial setting，which is not flexible enough to give full play to the advantages of stochastic resonance signal detection. In this paper，an adaptive stochastic resonance detection scheme based on multi-strategy fusion particle swarm optimization is proposed by analyzing the characteristics of weak underwater light signals and the conditions of stochastic resonance generation. It solves the problem that traditional particle swarm optimization is easy to fall into local optimization resulting in low convergence accuracy and difficult convergence. By introducing adaptive inertia weights to dynamically adjust the local search ability and global search ability of particles，the convergence speed of the algorithm is accelerated. In the process of particle evolution，neighborhood detection is used to strengthen the detection of local extremum location neighborhood，which makes the search radius of the algorithm larger in the initial stage of evolution，and gradually decreases with the increase of iteration times，which increases the refinement ability of the algorithm. Using Cauchy variation and reverse learning interactive strategy to mutate the optimal solution，the local optimal solution in Particle Swarm Optimization is broken，and the ability of the algorithm to escape from local space is effectively improved. In order to evaluate the feasibility and effectiveness of the proposed algorithm，simulation is carried out under the established UWOC weak signal detection system. Considering the special property of pilot signal，that is，some known data is inserted at the sending end and can be accurately extracted at the receiving end，it can be used as a reliable reference signal for parameter estimation. Therefore，this paper selects a specific number of code elements for parameter optimization. By taking the output SNR of the system as the selection index，the optimal system parameter which makes the output SNR maximum is searched and iterated continuously within the preset algorithm parameter range. The optimal system parameters are substituted into the fourth-order Runge-Kutta equation，the output response is obtained by discretization，and the weak light signal is detected. Finally，the error performance of bipolar non-return-to-zero signal with white Gaussian noise is compared under four detection schemes：non-stochastic resonance，fixed parameter stochastic resonance，adaptive stochastic resonance based on particle swarm optimization algorithm and multi-strategy fusion particle swarm optimization algorithm. The simulation results show that the bit error rate performance of the non-stochastic resonance system is worse than that of the other three detection schemes，and the bit error rate performance of the fixed parameter stochastic resonance system has limitations. Adaptive stochastic resonance can significantly improve the bit error rate performance of the system，especially above -6 dB，and the improvement effect is very obvious. Compared with the adaptive stochastic resonance based on particle swarm optimization algorithm，the proposed algorithm has faster convergence speed， more accurate optimization results and less error performance. In order to verify the effectiveness and feasibility of the proposed method， a UWOC experimental system is established. The experimental results show that when the received signal-to-noise ratio is - 1.7 dB，the bit error rate of the proposed algorithm can reach 2×10-4，and its performance is better than that of NO-SR and F-SR， which once again verifies the effectiveness of the proposed algorithm. © 2024 Chinese Optical Society. All rights reserved.
  Accession Number: 20241215774978
• Record 130 of
  
  Title:Direct femtosecond laser writing fiber Bragg gratings in double-D cladding chalcogenide glass infrared fibers
  
  Author(s):Liu, Lutao(1,2); Li, Xingyong(3); Xu, Yantao(1,2); Chen, Fengyi(3); Xiao, Xusheng(1,2); He, Wentao(1,2); Wang, Ruohui(3); Zhang, Peiqing(4); Yu, Yongsen(5); Guo, Haitao(1,2)
  Source: Optics and Laser Technology  Volume: 174  Issue:   DOI: 10.1016/j.optlastec.2024.110586  Published: July 2024  
  Abstract:Chalcogenide glass (ChG) fiber Bragg grating (FBG) is one of the key components in monolithic infrared fiber lasers and sensors. However, its effective fabrication using direct femtosecond laser writing is still seldom reported, owing to complications attributable to ChG. In this study, a double-D shaped ChG fiber was used to fabricate FBGs with high reflectivity (a 20.5 dB dip in the transmittance) and narrow 3-dB bandwidth (164 pm) using direct femtosecond laser writing. The high sensitivity to laser powers of the direct writing of the ChG FBG was revealed and understood from the perspective of the low laser-induced damage threshold of ChGs. Lower-order reflectance of the directly written FBGs at the mid-infrared wavelength region were quantitively predicted to have higher reflectivity. These results provide a robust method of writing FBGs with arbitrary periods in ChG fibers, establishing a solid foundation for the development of infrared fiber lasers and fiber sensors. © 2024 Elsevier Ltd
  Accession Number: 20240415438975
• Record 131 of
  
  Title:A truncated test scheme design method for success-failure in-orbit tests
  
  Author(s):Ding, Wenzhe(1,2); Bai, Xiang(1); Wang, Qingwei(1); Long, Fang(1); Li, Hailin(1); Wu, Zhengrong(1); Liu, Jian(1); Yao, Huisheng(1); Yang, Hong(1)
  Source: Reliability Engineering and System Safety  Volume: 243  Issue:   DOI: 10.1016/j.ress.2023.109782  Published: March 2024  
  Abstract:Based on the success-failure test feature of in-orbit tests (IOTs) for typical space equipment, this paper presents a method for designing a truncated test scheme for success-failure in-orbit tests. With this method, a small upper boundary of the sample size for the IOT verification test can be obtained before the test starts. The method introduces the truncated Bayes-sequential mesh test (SMT) method into the design of the IOT verification test scheme and greatly compresses the continuous test area by incorporating optimization theory, resulting in a smaller upper limit of the IOT sample size. First, this paper derives a specific calculation formula for the Bayes-SMT critical line. Second, the Markov chain model is adopted to calculate the occurrence probabilities of each acceptance and rejection point through state transition. Finally, an optimal truncated test optimization algorithm based on the augmented lagrangian genetic algorithm is proposed. Simulation tests show that, compared with the classical single sampling method, the truncated sequential probability ratio test method, the truncated SMT method, and the truncated Bayes-SMT method based on step-by-step calculation, the method presented in this paper can be used to obtain a sequential test scheme with smaller truncated sample size. © 2023
  Accession Number: 20234715092999
• Record 132 of
  
  Title:Stress-induced Polarization-Maintaining Large-mode-area Photonic Crystal Fibers with Deviation of the Single-mode Transmission Band and Delocalization of Higher-order Modes
  
  Author(s):Ma, Yuan(1); Wan, Rui(2); Yang, Huanhuan(1); Li, Yanfu(1); Chen, Chao(2); Wang, Pengfei(2)
  Source: IEEE Photonics Journal  Volume:   Issue:   DOI: 10.1109/JPHOT.2024.3395776  Published: 2024  
  Abstract:The nonlinear effects and laser-induced optical and thermal damage in optical fibers, together with the limitations of beam quality and mode-field area, restrict the power scaling-up of single-mode output for developing high-power fiber lasers in the kilowatt and above range. The design of photonic crystal fibers (PCFs) with large mode areas is an effective way to address this problem. In this paper, the demands and challenges of designing very large-mode-area (VLMA-) PCFs are discussed, including the overall fiber structure design and property simulation, especially the precise definition of single-mode operating conditions of VLMA-PCFs. Finally, an advanced stress-induced polarizationmaintaining, Yb-doped, PCF structure with a large mode area realized by introducing both leakage channels and higher order mode-filtering units is proposed and analyzed theoretically, for which a maximum core diameter of 101 μm and single-mode field diameter of 76.33 μm at 1064 nm and a birefringence value > 10−4 orders of magnitude are achieved. Authors
  Accession Number: 20241916047122