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Chinese physics Letters 2013年第9期30卷 58-60页

作者：蔣安忠林彥穎 Nuclear Science and Technology Development Center National Tsing-Hua UniversityHsinchu 30013 institute of photonics technologies National Tsing-Hua UniversityHsinchu 30013

We report a compact and wavelength-tunable periodically poled lithium niobate(PPLN)Q-switched laser with intra-cavity optical parametric generation,producing 8-ns,10-𝜈μJ pulses at 10-kHz repetition rate when pumped with a 10-W diode laser at 808nm.The output wavelength can be tuned from 1450nm to 1600nm.Multiple-pulse generation was observed in the experiment.

关键词： pumped switched tunable

Control of Group Velocity via Spontaneous Generated Coherence and Kerr Nonlinearity

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Communications in Theoretical physics 2014年第9期61卷 410-416页

作者： Hazrat Ali Iftikhar Ahmad Ziauddin department of physics University of Malakand Khyber Pakhtunkhwa Pakistan department of physics COMSATS Institute of Information Technology Islamabad Pakistan institute of photonics technologies National Tsing Hua University

A four-level N-type atomic medium is considered to study the effect of spontaneous generated coherence(SGC) and Kerr nonlinearity on light pulse propagation. A light pulse is propagating inside the medium where each atom follows four-level N-type atom-field configuration of rubidium(85Rb) atom. The atom-field interaction leads to electromagnetically induced transparency(EIT) process. The atom-field interaction is accompanied by normal dispersion and in the presence of SGC and Kerr nonlinearity the dispersion property of the proposed atomic medium is modified,which leads to enhancement of positive group index of the medium. The enhancement of positive group index then leads to slow group velocity inside the medium. A more slow group velocity is also investigated by incorporated the collective effect of SGC and Kerr nonlinearity. The control of group velocity inside a four-level N-type atomic medium via collective effect of SGC and Kerr nonlinearity is the major part of this work.

关键词： Kerr nonlinearity spontaneous generated coherence and group index

Technology for the next gravitational wave detectors

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中国科学：物理学、力学、天文学英文版 2015年第12期58卷 65-90页

作者： MITROFANOV Valery P. CHAO Shiuh PAN huang-Wei KUO Ling-Chi COLE Garrett DEGALLAIX Jerome WILLKE Benno Faculty of physics Moscow State University institute of photonics technologies "National" Tsing Hua University Crystalline Mirror Solutions LLC Crystalline Mirror Solutions Gmb H Seestadtstr Vienna Center for Quantum Science and Technology(VCQ) Faculty of Physics University of Vienna Laboratoire des Mat'eriaux Avanc'es 7 Avenue Pierre de Coubertin Max Planck institute for Gravitational physics(Albert Einstein institute) and Leibniz Universitt Hannover

This paper reviews some of the key enabling technologies for advanced and future laser interferometer gravitational wave detectors, which must combine test masses with the lowest possible optical and acoustic losses, with high stability lasers and various techniques for suppressing noise. Sect. 1 of this paper presents a review of the acoustic properties of test masses. Sect. 2 reviews the technology of the amorphous dielectric coatings which are currently universally used for the mirrors in advanced laser interferometers, but for which lower acoustic loss would be very advantageous. In sect. 3 a new generation of crystalline optical coatings that offer a substantial reduction in thermal noise is reviewed. The optical properties of test masses are reviewed in sect. 4, with special focus on the properties of silicon, an important candidate material for future detectors. Sect. 5 of this paper presents the very low noise, high stability laser technology that underpins all advanced and next generation laser interferometers.

关键词：引力波探测器使能技术激光干涉计测试质量光学涂层光学性质高稳定性激光干涉仪

Multi-frame speckle reduction in OCT using supercontinuum pumped by noise-like pulses

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Journal of Innovative Optical Health Sciences 2019年第2期12卷 86-92页

作者： Chengming Wang Yi-Jing You Shengnan Ai Wenxin Zhang Wenchao Liao Xiao Zhang Juicheng Hsieh Ning Zhang Bihua Tang Ci-Ling Pan Ping Xue State Key Laboratory of Low-Dimensional Quantum physics department of physics Tsinghua University Collaborative Innovation Center of Quantum Matter BeijingP.R.China department of physics National Tsing Hua University No.101Sec.2Kuang-Fu RdHsinchuTaiwan department of physics and institute of photonics technologies national tsing hua university Taiwan School of Life Science Beijing institute of Technology BeijingP.R.China institute of Forensic Science Ministry of Public Security Beijing P.R.China Southwest Medical university Luzhou Sichuan ProvinceP.R.China Nuctech Company Limited BeijingP.R.China

In most coherent imaging modality,speckle noise is a major cause that blurs the boundary of tissues and degrades the image contrast.By utilizing the unique properties of supercontinuum(SC)generated by noise-like pulses(NLPs)and a simple multi-frame averaging technique,we achieved significant speckle reduction in spectral domain optical coherence tomography(SD-OCT).We quantitatively compared the speckle of our proposed method with those of conventional swept source OCT(SS-OCT)and SD-OCT based on commercial light sources.The experimental results show that SC pumped by NLPs combined with noncoherent averaging method achieves better denoising performance in terms of contrast to noise ratio(CNR).

关键词： Noise-like pulses supercontinuum generation speckle reduction optical coherence tomography

Engineering of strong mechanical squeezing via the joint effect between Duffing nonlinearity and parametric pump driving

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photonics Research 2019年第11期7卷 1229-1239页

作者： Cheng-hua Bai Dong-Yang Wang Shou Zhang Shutian Liu Hong-Fu Wang department of physics Harbin Institute of TechnologyHarbin 150001China department of physics College of ScienceYanbian UniversityYanji 133002China

Previous works for achieving mechanical squeezing focused mainly on the sole squeezing manipulation method.Here we study how to construct strong steady-state mechanical squeezing via the joint effect between Duffing nonlinearity and parametric pump driving. We find that the 3 d B limit of strong mechanical squeezing can be easily overcome from the joint effect of two different below 3 d B squeezing components induced by Duffing nonlinearity and parametric pump driving, respectively, without the need of any extra technologies, such as quantum measurement or quantum feedback. We first demonstrate that, in the ideal mechanical bath, the joint squeezing effect just is the superposition of the two respective independent squeezing components. The mechanical squeezing constructed by the joint effect is fairly robust against the mechanical thermal noise. Moreover, different from previous mechanical squeezing detection schemes, which need to introduce an additional ancillary cavity mode, the joint mechanical squeezing effect in the present scheme can be directly measured by homodyning the output field of the cavity with an appropriate phase. The joint idea opens up a new approach to construct strong mechanical squeezing and can be generalized to realize other strong macroscopic quantum effects.

关键词： method. nonlinearity squeezing

Self-powered solar-blind photodiodes based on EFG-grown(100)-dominant β-Ga_(2)O_(3) substrate

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Chinese physics B 2021年第1期30卷 483-486页

作者：褚旭龙刘增支钰崧刘媛媛张少辉吴超高昂李培刚郭道友吴真平唐为华 Laboratory of Information Functional Materials and Devices School of Science&State Key Laboratory of Information Photonics and Optical CommunicationsBeijing University of Posts and TelecommunicationsBeijing 100876China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China The Engineering Research Center for Semiconductor Integrated Technology Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China China Aerospace System Simulation Technology Co. Ltd.(Beijing)Beijing 100195China Division of Interdisciplinary and Comprehensive Research&Platform for Characterization and Test Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China Center for Optoelectronics Materials and Devices&Key Laboratory of Optical Field Manipulation of Zhejiang Province Department of PhysicsZhejiang Sci-Tech UniversityHangzhou 310018China School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026China College of Electronic and Optical Engineering&College of Microelectronics Nanjing University of Posts and TelecommunicationsNanjing 210046China national and Local Joint Engineering Laboratory for RF Integration and Micro-Packing technologies Nanjing University of Posts and TelecommunicationsNanjing 210046China

We report the edge-defined-film-fed(EFG)-grown β-Ga_(2)O_(3)-based Schottky photodiodes.The device has a reverse leakage current of ~nA and a rectified ratio of ~10^(4) at ±5 V.In addition,the photodiode detector shows a dark current of 0.3 pA,a photo-responsivity(R) of 2.875 mA/W,a special detectivity(D*) of 10^(10) Jones,and an external quantum efficiency(EQE) of 1.4% at zero bias,illustrating a self-powered operation.This work may advance the development of the Ga_(2)O_(3)-based Schottky diode solar-blind photodetectors.

关键词： β-Ga_(2)O_(3)substrate Schottky photodiode solar-blind detection

Temperature dependence of Raman scattering in n-type 6H-SiC

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Temperature dependence of Raman scattering in n-type 6H-SiC