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Chinese Physics B 2013年第2期22卷 145-148页

作者：孔德鹏王丽莉贺正权储九荣马天 State Key Laboratory of Transient Optics and photonics Xi'an Institute of Optics and Precision Mechanics Chinese Academy of Sciences Production and Application of Plastic Optical Fiber National and Local Engineering Laboratory Sichuan Huiyuan Plastic Optical Fiber Co.Ltd.Chongzhou Industrial Development Zone

A method of fabricating multi-core polymer image fiber is *** fiber preform is fabricated by stacking thousands of polymer fibers each with a 0.25-mm diameter orderly in a die by only one *** preform is heated and stretched into image fiber with an outer diameter of *** a portable eyewear-style three-dimensional（3D） endoscope system is designed,fabricated,and *** endoscopic system is composed of two graded index lenses,two pieces of 0.35-m length image guide fibers,and a pair of *** shows good ？exibility and portability,and can provide the depth information accordingly.

关键词： three-dimensional endoscope image fiber polymer

Highly Efficient L-Band Fibre -DFB Lasers

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光学学报 2003年第S1期23卷 379-380页

作者： Morten Ibsen David J. Richardson David N. Payne ORC - University of Southampton Southampton SO17 1BJ United Kingdom. Also with Southampton Photonics Ltd. Southampton SO16 4NS United Kingdom.ORC - University of Southampton Southampton SO17 1BJ United Kingdom. Also with Southampton Photonics Ltd. Southampton SO16 4NS United Kingdom.ORC - University of Southampton Southampton SO17 1BJ United Kingdom. Also with Southampton Photonics Ltd. Southampton SO16 4NS United Kingdom.

A more than 12 mW highly efficient fibre-DFB laser operating at 1618.3 nm is fabricated and characterised. Its high-power, low-noise and single-polarisation characteristics make it very suitable WDM-source for L-band ... 详细信息

关键词： DFB Lasers high in for Highly Efficient L-Band Fibre WDM RIN

Freeform OST-HMD system with large exit pupil diameter and vision correction capability

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photonics Research 2022年第1期10卷 21-32页

作者： DEWEN CHENG JIAXI DUAN HAILONG CHEN HE WANG DANYANG LI QIWEI WANG QICHAO HOU TONG YANG WEIHONG HOU DONGHUA WANG XIAOYU CHI BIN JIANG YONGTIAN WANG Beijing Engineering Research Center of Mixed Reality and Advanced Display School of Optics and PhotonicsBeijing Institute of TechnologyBeijing 100081China Ned Co. Ltd.Beijing 100081China Goertek Co. Ltd.Weifang 261031China

Compactness and light weight,large exit pupil diameter and distance,small distortion for virtual image,and see-through light paths are pivotal factors to achieve a better,wearable experience of optical see-through headmounted displays(OST-HMDs).In addition,light efficiency of the virtual image light path is an important factor for heat dissipation in HMD *** paper presents a new type of OST-HMD optical system that includes three wedge-shaped freeform prisms and two symmetric *** on a 0.71 ***,an OST-HMD prototype with a diagonal field of view(FOV)of 45.3°,an F-number(F/#)of 1.8,an exit pupil size of 12 mm×8 mm,and an eye relief of 18 mm is *** maximum value of distortion of the final system is 0.6%and 0.4%for virtual image and see-through light path,*** overall dimension of the optical system per eye is no larger than 30 mm(width)×40 mm(height)×14 mm(thickness),and the weight of the optical module including lenses,holder,and microdisplay is 12.8 *** light efficiency of the virtual image light path is up to 50%higher than those of other OST-HMD optical solutions.

关键词： system distortion correction

High peak power femtosecond cylindrical vector beams generation in a chirped-pulse amplification laser system

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Chinese Optics Letters 2022年第3期20卷 52-56页

作者： Zexing Zhao Hao Chen Ziming Zhang jiatong Li Fangxiang Zhu Wei Wan Fei He Huifeng Wei Kangkang Chen Peiguang Yan College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China Wuhan Yangtze Soton Laser photonics Co. Ltd.Wuhan 430205China

Cylindrical vector beams(CVBs),with non-uniform state of polarizations,have become an indispensable tool in many areas of science and ***,little research has explored high power CVBs at the femtosecond *** this paper,we report on tne generation of high quality CVBs with high peak power and femtosecond pulse duration in a fiber chirped-pulse amplification laser *** radially(azimuthally)polarized vector beam has been obtained with a pulse duration of 4A0 fs[430 fs]and a maximum average output power of 20.36 W[20.12 W].The maximum output pulse energy is〜20μJ at a repetition rate of 1 MHz,corresponding to a high peak power of-46 *** comparison between simulated intensity profiles and measured experimental results suggests that the generated CVBs have a remarkable intensity *** proposed configuration of our laser system provides a promising solution for high quality CVBs generation with the characteristics of high peak power,ultrashort pulse duration,and high mode purity.

关键词： femtosecond laser structural beams pulse shaping amplifier

New control algorithm for automatic PMD compensation system

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Chinese Optics Letters 2012年第3期10卷 27-30页

作者：张锦南谷月袁学光田凤张晓光陶金晶 Institute of Information photonics and Optical Communications Beijing University of Posts and Telecommunications State Key Laboratory of Information photonics and Optical Communications Beijing University of Posts and Telecommunications Network Operation Supporting Center China Mobile Group Beijing Co.Ltd.

A new cross-tracking method is proposed to improve the convergent speed of the control algorithm in real-time polarization mode dispersion（PMD）compensation *** cross-tracking algorithm is compared with the previously used dithering particle swarm optimization（DPSO）and gradient particle swarm optimization（GPSO）algorithms,and it is proven to offer the best performance among the three *** transmission of a 43-Gb/s differential quadrature phase-shift keying（DQPSK）signal over a 1 200-km fiber span using a compensator based on digital signal processing（DSP）is demonstrated via the cross-tracking algorithm.

关键词： Algorithms Quadrature phase shift keying Signal processing Tracking (position)

Flexible nanoimprint lithography enables high-throughput manufacturing of bioinspired microstructures on warped substrates for efficient III-nitride optoelectronic devices

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Science Bulletin 2024年第13期69卷 2080-2088页

作者： Siyuan Cui Ke Sun Zhefu Liao Qianxi Zhou Leonard Jin Conglong Jin Jiahui Hu Kuo-Sheng Wen Sheng Liu Shengjun Zhou Center for photonics and Semiconductors School of Power and Mechanical EngineeringWuhan UniversityWuhan 430072China The Institute of Technological Sciences Wuhan UniversityWuhan 430072China Department of Mechanical and Mechatronics Engineering University of WaterlooWaterloo ONN2L 3G1Canada Jiangxi SMTC Semiconductor Co. Ltd.Nanchang 330096China

III-nitride materials are of great importance in the development of modern optoelectronics,but they have been limited over years by low light utilization rate and high dislocation densities in heteroepitaxial films grown on foreign substrate with limited refractive index contrast and large lattice ***,we demonstrate a paradigm of high-throughput manufacturing bioinspired microstructures on warped substrates by flexible nanoimprint lithography for promoting the light extraction *** design a flexible nanoimprinting mold of copolymer and a two-step etching process that enable high-efficiency fabrication of nanoimprinted compound-eye-like Al2O3 microstructure(NCAM)and nanoimprinted compound-eye-like SiO_(2)microstructure(NCSM)template,achieving a 6.4-fold increase in throughput and 25%savings in economic costs over stepper projection *** to NCAM template,we find that the NCSM template can not only improve the light extraction capability,but also modulate the morphology of AlN nucleation layer and reduce the formation of misoriented GaN grains on the inclined sidewall of microstructures,which suppresses the dislocations generated during coalescence,resulting in 40%reduction in dislocation *** study provides a low-cost,high-quality,and high-throughput solution for manufacturing microstructures on warped surfaces of III-nitride optoelectronic devices.

关键词： Flexible nanoimprint lithography Bioinspired Micro-and nano-manufacturing III-nitride epitaxy Optoelectronic devices

High pulse energy fiber/solid-slab hybrid picosecond pulse system for material processing on polycrystalline diamonds

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High Power Laser Science and Engineering 2018年第2期6卷 38-44页

作者： Wei Chen Bowen Liu Youjian Song Lu Chai Qianjin Cui Qingjing Liu Chingyue Wang Minglie Hu Ultrafast Laser Laboratory Key Laboratory of Opto-Electronic Information Technology Ministry of Education School of Precision Instrument and Opto-Electronics Engineering Tianjin University Laize photonics Co. Ltd

We demonstrate an all polarization-maintaining(PM) fiber mode-locked laser seeded, hybrid fiber/solid-slab picosecond pulse laser system which outputs 40 μJ, 10 ps pulses at the central wavelength of 1064 nm. The beam quality factors M2 in the unstable and stable directions are 1.35 and 1.31, respectively. 15 μJ picosecond pulses at the central wavelength of 355 nm are generated through third harmonic generation(THG) by using two Li B3 O5(LBO) crystals, in order to get better processing efficiency on polycrystalline diamonds. The high pulse energy and beam quality of these ultraviolet(UV) picosecond pulses are confirmed by latter experiments of material processing on polycrystalline diamonds. This scheme which combines the advantages of the all PM fiber mode-locked laser and the solid-slab amplifier enables compact, robust and chirped pulse amplification-free amplification with high power picosecond pulses.

关键词： all polarization-maintaining fiber chirped pulse amplification free amplification hybrid fiber/solid slab material processing mode-locked laser

Surrounding rock classification from onsite images with deep transfer learning based on EfficientNet

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Frontiers of Structural and Civil Engineering 2024年第9期18卷 1311-1320页

作者： Xiaoying ZHUANG Wenjie FAN Hongwei GUO Xuefeng CHEN Qimin WANG Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai 200092China Chair of Computational Science and Simulation Technology Institute of PhotonicsLeibniz University HannoverHannover 30167Germany Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education Tongji UniversityShanghai 200092China Guizhou Xingyi Huancheng Expressway Co. Ltd.Xingyi 562400China

This paper proposes an accurate,efficient and explainable method for the classification of the surrounding rock based on a convolutional neural network(CNN).The state-of-the-art robust CNN model(EfficientNet)is applied to tunnel wall image *** filtering,data augmentation and other data pre-processing techniques are used to improve the data quality and *** with transfer learning,the generality,accuracy and efficiency of the deep learning(DL)model are further improved,and finally we achieve 89.96%*** with other state-of-the-art CNN architectures,such as ResNet and Inception-ResNet-V2(IRV2),the presented deep transfer learning model is more stable,accurate and *** reveal the rock classification mechanism of the proposed model,Gradient-weight Class Activation Map(Grad-CAM)visualizations are integrated into the model to enable its explainability and *** developed deep transfer learning model has been applied to support the tunneling of the Xingyi City Bypass in the high mountain area of Guizhou,China,with great results.

关键词： surrounding rock classification convolutional neural network EfficientNet Gradient-weight Class Activation Map

Regrowth-Free Processing for GaAs and InP Photonic Integrated Circuits

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光学学报 2003年第S1期23卷 443-444页

作者： John H. Marsh Intense photonics ltd 4 Stanley Boulevard High Blantyre G72 OBN Scotland UK

Technologies are described for integrating multiple bandgaps and photonic crystal structures monolithically in a semiconductor chip. Practical devices examples include high power 980 nm pumps, 2×2 crosspoint switches... 详细信息

关键词： for in In of mode Regrowth-Free Processing for GaAs and InP Photonic Integrated Circuits have high been

A reflective semiconductor optical amplifier based all-optical header separator

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Optoelectronics Letters 2010年第5期6卷 338-341页

作者：赵俊邵宗彪孙小菡 Laboratory of photonics and Optical Communications Department of Electronics Engineering Southeast University R & D Center Nanjing Nari-Relays Electric Co. LTD

An all-optical header extraction scheme based on the reflective semiconductor optical amplifier (RSOA) is presented, which can be used to process variable-length and bit-rate transparent packets. Through selecting the appropriate carrierlifetime of the RSOA, the payload pulses obtain smaller gains than header pulses and are considered to be compressed. By using the reflective structure, the header pulses can acquire larger gains than the payload twice, and the contrast radio (CR) is improved. The simulation results show that the CRs can reach 22.8 dB and 18 dB for the packets with header pulses at the rates of 2.5 Gb/s and 10 Gb/s, respectively, and these values can be optimized through properly selecting the structure parameters, such as the small-signal gain and saturation energy.

关键词：半导体光放大器反射式光头分离器小信号增益可变长度提取方案有效载荷