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1.55-μm supercontinuum based on dispersion-flattened photonic crystal fiber

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Optoelectronics Letters 2007年第5期3卷 346-348页

作者： zhang Xia XU yong-zhao huang yong-qing ren xiao-min Key Laboratory of Optical Communication and Lightwave Technologies Ministry of Education Beijing University of postsand Telecommunications Beijing 100876 China

A dispersion-flattened photonic crystal fiber with normal dispersion is designed for generating flat wideband supercontanuum, and the supercontinuum generation in this fiber is numerically analyzed. The results show that by appropriately designing the photonic crystal fiber, it can achieve flattened dispersion in the normal dispersion region. It is found that a fiber characterized by a flattened dispersion with a small normal dispersion is suitable for a flat wideband supercontinuum generation. In the process of spectral broadening, self-phase modulation effect plays a dominant role. By filtering the supercontinuum, pulses with different central wavelength over a wide spectral range can be obtained. The pulse width is determined by the bandwidth of the filter.

关键词：光学纤维光子晶体色散频率

Investigation of all-optical regeneration based on self-phase modulation in microstructured fibers

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Optoelectronics Letters 2007年第1期3卷 18-21页

作者： WEI Yan-fen XU yong-zhao zhang Xia huang yong-qing ren xiao-min Optical Communication Center Beijing University of Posts and Telecommunications Beijing 100876 China

All-optical regeneration based on self-phase modulation in microstructured fibers is studied. The effects of pulse peak power into the fiber, pulse width and filter parameters on the performance of the regenerator are investigated. The effects of normal dispersion and anomalous dispersion of the microstructured fiber on optical regeneration are compared. The nu- merical results show that optical regeneration can be achieved by using microstructured fibers with normal dispersion or anomalous dispersion, but the normal dispersion decreases the oscillatory structure in the broadened spectra and obtain a better regenerator transfer function. In order to achieve optical regeneration, the input peak power into the microstructured fiber and the filter parameters need to meet certain requirements. By optimizing those parameters, a better regeneration result can be obtained.

关键词：微结构光纤全光再生自相位调制滤波器参数

Growth of Self-Catalyzed InP Nanowires by Metalorganic Chemical Vapour Deposition

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Chinese Physics Letters 2012年第12期29卷 145-147页

作者： LV xiao-Long zhang Xia YAN Xin LIU xiao-Long CUI Jian-Gong LI Jun-Shuai huang yong-qing ren xiao-min State Key Laboratory of Information Photonics&Optical Communications Beijing University of Posts and TelecommunicationsBeijing 100876

The fabrication of self-catalyzed InP nanowires(NWs)is investigated under different growth *** droplets induced by surface reconstruction act as nucleation sites for NW *** standing NWs with uniform cross sections are obtained under optimized *** is confirmed that the growth rate of NWs is strongly affected by the surface diffusion adatoms while contributions from the direct impingement of vapor species onto the In droplets can be *** results indicate that the droplet acts as an adatom collector rather than a ***,the diffusion flow rate of adatoms increases with time at the beginning of growth and stabilizes as the growth proceeds.

关键词： nanowires diffusion negligible

Growth of Zinc Blende GaAs/AlGaAs Radial Heterostructure Nanowires by a Two-Temperature Process

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Chinese Physics Letters 2011年第3期28卷 140-143页

作者： GUO Jing-Wei huang Hui ren xiao-min YAN Xin CAI Shi-Wei GUO Xin huang yong-qing WANG Qi zhang Xia WANG Wei Key Laboratory of Information Photonics and Optical Communications(ministry of Education) Beijing University of Posts and TelecommunicationsBeijing 100876

Zinc blende structure GaAs/AlGaAs core-multishell nanowires(NWs)are grown on a GaAs(111)B substrate by a two-temperature process using an Au-catalyzed vapor-liquid-solid mechanism and metal organic chemical vapor deposition,***-free radial heterostructure NWs are *** can be concluded that the NWs are grown with the main contributions from the direct impingement of the precursors onto the alloy droplets and little from adatom *** results indicate that the droplet acts as a catalyst rather than an adatom *** photoluminescence spectra reveal that the grown NWs have much higher optical efficiency than bare GaAs NWs.

关键词： GaAs/AlGaAs nanowires Zinc

Spectrally Sliced Pulse Source Based on Supercontinuum Generation in Dispersion-Flattened Photonic Crystal Fiber

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Semiconductor Photonics and Technology 2008年第3期14卷 162-166,206页

作者： XU yong-zhao zhang Xia huang yong-qing ren xiao-min Department of Electronic Engineering Dongguan University of Technology Dongguan 523808 CHN Key Laboratory of Optical Communication and Lightwave Technologies ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 CHN

Designed is dispersion-flattened photonic crystal fiber（PCF） with small normal dispersion for generating flat wideband supercontinuum （SC）, and demonstrated is spectrally sliced pulse source which utilizes supereontinuum generated in dispersion-flattened photonic crystal fiber. The results show that the fiber characterized by flattened dispersion with small normal dispersion is suitable for flat wideband supercontinuum generation. In the process of spectral broadening, self-phase modulation plays a dominant role. By filtering the supercontinuum, multi-wavelength pulses can be obtained over a wide spectral range.

关键词： supercontinuum dispersion photonic crystal fiber

Measurement of the neutron total cross section of carbon at the Back-n white neutron beam of CSNS

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Nuclear Science and Techniques 2019年第9期30卷 73-82页

作者： Xing-Yan Liu Yi-Wei yang Rong Liu Jie Wen Zhong-Wei Wen Zi-Jie Han Zhi-zhou ren Qi An Huai-yong Bai Jie Bao Ping Cao Qi-Ping Chen yong-Hao Chen Pin-Jing Cheng Zeng-Qi Cui Rui-Rui Fan Chang-qing Feng min-Hao Gu Feng-Qin Guo Chang-Cai Han Guo-Zhu He yong-Cheng He Yue-Feng He Han-Xiong huang Wei-Ling huang Xi-Ru huang xiao-Lu Ji Xu-yang Ji Hao-Yu Jiang Wei Jiang Han-Tao Jing Ling Kang ming-Tao Kang Bo Li Lun Li Qiang Li xiao Li yang Li yang Li Shu-bin Liu Guang-Yuan Luan Ying-Lin Ma Chang-Jun Ning bin-bin Qi Jie ren Xi-Chao Ruan Zhao-Hui Song Hong Sun xiao-yang Sun Zhi-Jia Sun Zhi-Xin Tan Hong-qing Tang Jing-Yu Tang Peng-Cheng Wang Qi Wang Tao-Feng Wang Yan-Feng Wang Zhao-Hui Wang Zheng Wang qing-Biao Wu xiao-Guang Wu Xuan Wu Li-Kun Xie Han Yi Li Yu Tao Yu yong-Ji Yu Guo-Hui zhang Jing zhang Lin-Hao zhang Li-Ying zhang qing-min zhang Qi-Wei zhang Xian-Peng zhang Yu-Liang zhang Zhi-yong zhang Ying-Tan Zhao Liang zhou Zu-Ying zhou Dan-yang Zhu Ke-Jun Zhu Peng Zhu Institute of Nuclear Physics and Chemistry China Academy of Engineering Physics State Key Laboratory of Particle Detection and Electronics Chinese Academy of Sciences(CAS) Department of Modern Physics University of Science and Technology of China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking University Key Laboratory of Nuclear Data China Institute of Atomic Energy Institute of High Energy Physics Chinese Academy of Sciences(CAS) Spallation Neutron Source Science Center University of South China Northwest Institute of Nuclear Technology Department of Engineering and Applied Physics University of Science and Technology of China Beihang University Xi’an Jiaotong University

To verify the performance of the neutron total cross-sectional spectrometer, the neutron total cross section of carbon is initially measured in the energy range of 1 eV to 20 MeV using the time-of-flight method. The measurement is performed at the Back-n white neutron source with a 76-m time-of-flight path using the China Spallation Neutron Source. A multilayer fast fission chamber with 235U and 238U is employed as the neutron detector. The diameter and thickness of the natural graphite sample are 70 mm and 40 mm, respectively. Signal waveforms are collected using a data acquisition system. Off-line data processing was used to obtain the neutron time-of-flight spectra and transmissions. The uncertainty of the counting statistics is generally approximately 3% for each bin in the energy range of 1–20 MeV. It is determined that the results for the neutron total cross section of carbon obtained using ^235U cells are in good agreement with the results obtained using 238U cells within limits of statistical uncertainty. Moreover, the measured total cross sections show good agreement with the broadening evaluated data.

关键词： CSNS Back-n white neutron source NTOX Neutron total cross section Carbon Multilayer fast fission chamber

Experimental study on an all-optical switching based on MF-NOLM

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Optoelectronics Letters 2006年第3期2卷 172-174页

作者： SONG Xue-peng ren xiao-min zhang Xia yang Guang-qiang huang yong-qing Beijing Univ. of Posts ＆ Telecom . Beijing China 700876 China

In this paper,the experiment on an all-optical switching is reported based on a microstructure fiber（MF）- nonlinear optical loop mirror（NOLM）. In the experiment, a 25-meter-long MF（ γ = 36W^-1 km^-1@ 1 550 nm） is used as a nonlinear medium of the nonlinear optical loop mirror and the input signal is generated by a 10 GHz tunable picosecond laser source,with a full-width at half-maximum （FWHM） of 2 ps and centered at 1 550 nm. With the increase of input power,a π nonlinear phase shift is obtained by a 40/60 coupler in the experiment,but the same result can not be found by a 48/52 coupler. Additionally,the switching devices can also be used as an all-optical regeneration.

关键词： MFNOLM 光子交换微观结构光纤

Measurement of the ^(232)Th(n,f)cross section in the 1-200 MeV range at the CSNS Back-n

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Nuclear Science and Techniques 2023年第8期34卷 142-153页

作者： Zhi-zhou ren Yi-Wei yang yong-Hao Chen Rong Liu Bang-Jiao Ye Jie Wen Hai-Rui Guo Zi-Jie Han Qi-Ping Chen Zhong-Wei Wen Wei-Li Sun Han Yi Xing-Yan Liu Tao Ye Jiang-Bo Bai Qi An Jie Bao Yu Bao Ping Cao Hao-Lei Chen Zhen Chen Zeng-Qi Cui Rui-Rui Fan Chang-qing Feng Ke-qing Gao xiao-Long Gao min-Hao Gu Chang-Cai Han Guo-Zhu He yong-Cheng He yang Hong Yi-Wei Hu Han-Xiong huang Xi-Ru huang Hao-Yu Jiang Wei Jiang Zhi-Jie Jiang Han-Tao Jing Ling Kang Bo Li Chao Li Jia-Wen Li Qiang Li xiao Li yang Li Jie Liu Shu-bin Liu Ze Long Guang-Yuan Luan Chang-Jun Ning Meng-Chen Niu bin-bin Qi Jie ren Xi-Chao Ruan Zhao-Hui Song Kang Sun Zhi-Jia Sun Zhi-Xin Tan Jing-Yu Tang Xin-Yi Tang bin-bin Tian Li-Jiao Wang Peng-Cheng Wang Zhao-Hui Wang xiao-Guang Wu Xuan Wu Li-Kun Xie xiao-Yun yang Li Yu Tao Yu yong-Ji Yu Guo-Hui zhang Lin-Hao zhang Qi-Wei zhang Xian-Peng zhang Yu-Liang zhang Zhi-yong zhang Lu-Ping zhou Zhi-Hao zhou Ke-Jun Zhu Department of Modern Physics University of Science and Technology of ChinaHefei 230026China Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900China Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China Institute of Applied Physics and Computational Mathematics Beijing 100088China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230027China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230027China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China State Key Laboratory of Particle Detection and Electronics Institute of High Energy PhysicsChinese Academy of SciencesBeijingChina Northwest Institute of Nuclear Technology Xi’an 710024China University of Chinese Academy of Sciences Beijing 100049China Department of Engineering and Applied Physics University of Science and Technology of ChinaHefei 230026China

The ^(232)Th(n,f)cross section is very important in basic nuclear physics and applications based on the Th/U fuel *** the time-of-flight method and a multi-cell fast-fission ionization chamber,a novel measurement of the^(232)Th(n,f)cross sec-tion relative to^(235)U in the 1–200 MeV range was performed at the China Spallation Neutron Source Back-n white neutron source(Back-n).The fission event-neutron energy spectra of^(232)Th and^(235)U fission cells were measured in the single-bunch *** 232Th/235U fission cross-sectional ratios were obtained,and the measurement uncertainties were 2.5–3.7%for energies in the 2–20 MeV range and 3.6–6.2%for energies in the 20–200 MeV ***^(232)Th(n,f)cross section was obtained by introducing the standard cross section of^(235)U(n,f).The results were compared with those of previous theoreti-cal calculations,measurements,and *** measured 232Th fission cross section agreed with the main evaluation results in terms of the experimental uncertainty,and 232Th fission resonances were observed in the 1–3 MeV *** present results provide^(232)Th(n,f)cross-sectional data for the evaluation and design of Th/U cycle nuclear systems.

关键词： 232Th(n f)cross section Fast-fission ionization chamber Back-n white neutron source

Back-n white neutron source at CSNS and its applications

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Nuclear Science and Techniques 2021年第1期32卷 95-104页

作者： Jing-Yu Tang Qi An Jiang-Bo Bai Jie Bao Yu Bao Ping Cao Hao-Lei Chen Qi-Ping Chen yong-Hao Chen Zhen Chen Zeng-Qi Cui Rui-Rui Fan Chang-qing Feng Ke-qing Gao xiao-Long Gao min-Hao Gu Chang-Cai Han Zi-Jie Han Guo-Zhu He yong-Cheng He yang Hong Yi-Wei Hu Han-Xiong huang Xi-Ru huang Hao-Yu Jiang Wei Jiang Zhi-Jie Jiang Han-Tao Jing Ling Kang Bo Li Chao Li Jia-Wen Li Qiang Li xiao Li yang Li Jie Liu Rong Liu Shu-bin Liu Xing-Yan Liu Ze Long Guang-Yuan Luan Chang-Jun Ning Meng-Chen Niu bin-bin Qi Jie ren Zhi-zhou ren Xi-Chao Ruan Zhao-Hui Song Kang Sun Zhi-Jia Sun Zhi-Xin Tan Xin-Yi Tang bin-bin Tian Li-Jiao Wang Peng-Cheng Wang Zhao-Hui Wang Zhong-Wei Wen xiao-Guang Wu Xuan Wu Li-Kun Xie xiao-Yun yang Yi-Wei yang Han Yi Li Yu Tao Yu yong-Ji Yu Guo-Hui zhang Lin-Hao zhang Qi-Wei zhang Xian-Peng zhang Yu-Liang zhang Zhi-yong zhang Lu-Ping zhou Zhi-Hao zhou Ke-Jun Zhu 无 State Key Laboratory of Particle Detection and Electronics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Spallation Neutron Source Science Center Dongguan 523803China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China Northwest Institute of Nuclear Technology Xi’an 710024China University of Chinese Academy of Sciences Beijing 100049China Department of Engineering and Applied Physics University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China The CSNS Back-n Collaboration

Back-streaming neutrons from the spallation target of the China Spallation Neutron Source(CSNS)that emit through the incoming proton channel were exploited to build a white neutron beam facility(the so-called Back-n white neutron source),which was completed in March *** Back-n neutron beam is very intense,at approximately 29107 n/cm2/s at 55 m from the target,and has a nominal proton beam with a power of 100 kW in the CSNS-I phase and a kinetic energy of 1.6 GeV and a thick tungsten target in multiple slices with modest moderation from the cooling water through the *** addition,the excellent energy spectrum spanning from 0.5 eV to 200 MeV,and a good time resolution related tothe time-of-flight measurements make it a typical white neutron source for nuclear data measurements;its overall performance is among that of the best white neutron sources in the *** with advanced spectrometers,detectors,and application utilities,the Back-n facility can serve wide applications,with a focus on neutron-induced cross-sectional *** article presents an overview of the neutron beam characteristics,the experimental setups,and the ongoing applications at Backn.

关键词： White neutron source Nuclear data measurements Experimental setups Neutron applications