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Research on multi-kilowatts level tapered fiber bundle N × 1 pumping combiner for high power fiber laser

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Frontiers of Optoelectronics 2016年第2期9卷 301-305页

作者： qirong xiao Yusheng HUANG Junyi SUN Xuejiao WANG Dan LI Mali GONG Ping YAN Center for Photonics and Electronics Department of Precision Instrument Tsinghua University Beijing 100084 China

Pumping combiner is a kernel component of high power fiber laser （HPFL）. We demonstrate two types of tapered fiber bundle （TFB） end-pumping combiner able to combining multi-kilowatts of pumping laser. After the experimental test of coupling performance, the 3xl coupler is proved to have a power handling capacity of 2.11 kW with a coupling efficiency of 95.1%, and the 7× 1 coupler is capable of handling pumping power of 4.72 kW with a coupling efficiency of 99.4%. These two coupler have obtained the ability to be used in laser diodes （LDs） direct beam combining and the pumping coupling of multikilowatts level fiber lasers.

关键词： high power fiber laser (HPFL) pumpingcombiner tapered fiber bundle (TFB)

高功率线偏振掺镱光纤激光器性能调控技术研究进展

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光学学报 2023年第15期43卷 270-285页

作者：闫平吴与伦李丹王祎肖起榕巩马理清华大学精密仪器系光子测控技术教育部重点实验室北京100084 清华大学精密仪器系精密测试技术及仪器国家重点实验室北京100084 清华大学未央书院北京100084

线偏振光纤激光器相比于随机偏振光纤激光器,在相干探测、相干合成、偏振合成及非线性频率变换等方面有广泛的应用,因此近年来受到特别关注。本文先对近几年国内外的线偏振光纤激光器研究成果进行简要总结,再针对该类激光器的偏振控制... 详细信息

线偏振光纤激光器相比于随机偏振光纤激光器,在相干探测、相干合成、偏振合成及非线性频率变换等方面有广泛的应用,因此近年来受到特别关注。本文先对近几年国内外的线偏振光纤激光器研究成果进行简要总结,再针对该类激光器的偏振控制技术、光谱控制技术及光束质量控制技术进行归纳和评述。

关键词：线偏振光纤激光器偏振消光比掺镱光纤光谱控制光束质量

Versatile on-chip light coupling and(de)multiplexing from arbitrary polarizations to controlled waveguide modes using an integrated dielectric metasurface

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Photonics Research 2020年第4期8卷 564-576页

作者： YUAN MENG ZHOUTIAN LIU ZHENWEI XIE RIDE WANG TIANCHENG QI FUTAI HU HYUNSEOK KIM qirong xiao XING FU QIANG WU SANG-HOON BAE MALI GONG xiaoCONG YUAN State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentTsinghua UniversityBeijing 100084China Research Laboratory of Electronics Massachusetts Institute of TechnologyCambridgeMassachusetts 02139USA Key Laboratory of Photonic Control Technology Ministry of EducationTsinghua UniversityBeijing 100084China Nanophotonics Research Centre Shenzhen Key Laboratory of Micro-Scale Optical Information TechnologyShenzhen UniversityShenzhen 518060China Key Laboratory of Weak-Light Nonlinear Photonics Ministry of EducationTEDA Institute of Applied Physics and School of PhysicsNankai UniversityTianjin 300457China Department of Mechanical Engineering Massachusetts Institute of TechnologyCambridgeMassachusetts 02139USA

Metasurfaces have found broad applicability in free-space optics,while its potential to tailor guided waves remains barely *** synergizing the Jones matrix model with generalized Snell’s law under the phase-matching condition,we propose a universal design strategy for versatile on-chip mode-selective coupling with polarization sensitivity,multiple working wavelengths,and high efficiency *** coupling direction,operation frequency,and excited mode type can be designed at will for arbitrary incident polarizations,outperforming previous technology that only works for specific polarizations and lacks versatile mode ***,using silicon-nanoantenna-patterned silicon-nitride photonic waveguides,we numerically demonstrate a set of chip-scale optical couplers around 1.55μm,including mode-selective directional couplers with high coupling efficiency over 57%and directivity about 23 d *** and wavelength demultiplexer scenarios are also proposed with 67%maximum efficiency and an extinction ratio of 20 d ***,a chip-integrated twisted light generator,coupling free-space linear polarization into an optical vortex carrying 1 h orbital angular momentum(OAM),is also reported to validate the mode-control *** comprehensive method may motivate compact wavelength/polarization(de)multiplexers,multifunctional mode converters,on-chip OAM generators for photonic integrated circuits,and high-speed optical telecommunications.

关键词： Versatile on-chip light arbitrary polarizations waveguide modes an integrated dielectric metasurface

明清时期汉水下游地区的地理环境与堤防管理制度

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中国历史地理论丛 2008年第1期23卷 34-43页

作者：肖启荣复旦大学历史地理研究中心上海200433

明清时期国家对于汉水下游的水利管理制度经历一个变迁的过程,与这一区域的水利问题的日益突出密切相关,垸田的发展以及带来的问题是主要的因素。钟祥至沙洋的汉江干堤极易溃决,并且关系到整个下游地区的安全,因此在人力组织、资金筹集... 详细信息

明清时期国家对于汉水下游的水利管理制度经历一个变迁的过程,与这一区域的水利问题的日益突出密切相关,垸田的发展以及带来的问题是主要的因素。钟祥至沙洋的汉江干堤极易溃决,并且关系到整个下游地区的安全,因此在人力组织、资金筹集、岁修维护上,国家的政策表现出明显的倾斜性,相对于沙洋以下的区域,给予了充分的重视。沙洋以下,天门、潜江、沔阳等州县所在区域主要以垸田为主,国家将这一区域的堤防修筑与维护主要交由地方来进行。垸堤岁修维护采取堤甲制的组织形式,由垸民完成,一方面没有固定的资金,另一方面在正常年景之下,垸民可以获得基本的物质生存,因此垸堤的维护面临相当的困难。

关键词：地理环境堤防管理制度汉水下游

农民、政府与环境资源的利用——明清时期下河地区的农民生计与淮扬水利工程的维护

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社会科学 2019年第7期 144-155页

作者：肖启荣河南大学黄河文明与可持续发展研究中心

明中后期以来,出于分泄洪泽湖水的需要,下河地区的水利工程体系逐步形成,使得下河地区农民赖以生存的资源环境层次分明,并且形成了层次分明的生计格局。运河沿岸稻田区域受运河水灌溉,是较优良的稻作区域。湖荡区总体呈现出稻、渔、水... 详细信息

明中后期以来,出于分泄洪泽湖水的需要,下河地区的水利工程体系逐步形成,使得下河地区农民赖以生存的资源环境层次分明,并且形成了层次分明的生计格局。运河沿岸稻田区域受运河水灌溉,是较优良的稻作区域。湖荡区总体呈现出稻、渔、水产共存的混合农业的景观,同时水乡低地稻作的便利与收益上的优势,使得运河湖荡区一直处于被开发成稻田的进程中,导致湖荡的萎缩。政府顺应了农民生计方式与环境的约束,将运东稻田的维护摆在水利维护的首要位置,以征收赋税,维持行政的运转,影响着淮扬运河与淮扬地区水利工程的维护。下河地区农民与地方政府的行为显示了地域社会对环境资源利用的微观化策略。

关键词：农民生计水利工程维护淮扬地区明清

Optical meta-waveguides for integrated photonics and beyond

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Light(Science & Applications) 2021年第12期10卷 2263-2306页

作者： Yuan Meng Yizhen Chen Longhui Lu Yimin Ding Andrea Cusano Jonathan A.Fan Qiaomu Hu Kaiyuan Wang Zhenwei Xie Zhoutian Liu Yuanmu Yang Qiang Liu Mali Gong qirong xiao Shulin Sun Minming Zhang xiaocong Yuan Xingjie Ni State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentTsinghua University100084 BeijingChina Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing and School of Information Science and TechnologyFudan UniversityShanghai 200433China School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China Department of Electrical Engineering Pennsylvania State UniversityUniversity ParkPA 16802USA Optoelearonic Division Department of EngineeringUniversity of Sannio1-82100 BeneventoItaly Department of Electrical Engineering Stanford UniversityStanfordCA 94305USA Nanophotonics Research Centre Shenzhen Key Laboratory of Micro-Scale Optical Information TechnologyShenzhen UniversityShenzhen 518060China Key Laboratory of Photonic Control Technology Ministry of EducationTsinghua University100084 BeijingChina Yiwu Research Institute of Fudan University Chengbei RoadYiwu City 322000 ZhejiangChina Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074 HubeiChina

The growing maturity of nanofabrication has ushered massive sophisticated optical structures available on a photonic *** integration of subwavelength-structured metasurfaces and metamaterials on the canonical building block of optical waveguides is gradually reshaping the landscape of photonic integrated circuits,giving rise to numerous metawaveguides with unprecedented strength in controlling guided electromagnetic ***,we review recent advances in meta-structured waveguides that synergize various functional subwavelength photonic architectures with diverse waveguide platforms,such as dielectric or plasmonic waveguides and optical *** results and representative applications are comprehensively *** physical models with explicit design tutorials,either physical intuition-based design methods or computer algorithms-based inverse designs,are cataloged as *** highlight how meta-optics can infuse new degrees of freedom to waveguide-based devices and systems,by enhancing light-matter interaction strength to drastically boost device performance,or offering a versatile designer media for manipulating light in nanoscale to enable novel *** further discuss current challenges and outline emerging opportunities of this vibrant field for various applications in photonic integrated circuits,biomedical sensing,artificial intelligence and beyond.

关键词： waveguides waveguide beyond

Dual-wavelength bidirectional pumped high-power Raman fiber laser

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High Power Laser Science and Engineering 2019年第1期7卷 38-46页

作者： Zehui Wang qirong xiao Yusheng Huang Jiading Tian Dan Li Ping Yan Mali Gong State Key Laboratory of Precision Measurement Technology and Instruments & Key Laboratory of Photonics Control Technology of the Ministry of Education Tsinghua University

In this paper, we reported both the experimental demonstration and theoretical analysis of a Raman fiber laser based on a master oscillator–power amplifier configuration. The Raman fiber laser adopted the dual-wavelength bidirectional pumping configuration, utilizing 976 nm laser diodes and 1018 nm fiber lasers as the pump sources. A 60-m-long25/400 μm ytterbium-doped fiber was used to convert the power from 1070 to 1124 nm, realizing a maximum power output of 3.7 kW with a 3 dB spectral width of 6.8 nm. Moreover, we developed a multi-frequency model taking into consideration the Raman gain spectrum and amplified spontaneous emission. The calculated spectral broadening of both the forward and backward laser was in good agreement with the experimental results. Finally, a 1.5 kW, 1183 nm second-order Raman fiber laser was further experimentally demonstrated by the addition of a 70-m-long germaniumdoped passive fiber.

关键词： fiber laser fiber optics amplifiers and oscillators Raman laser

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淅川徐家岭M11出土文字资料及相关问题

考古与文物 2019年第4期 111-114页

作者：肖启荣黄锦前河南大学黄河文明与可持续发展研究中心暨黄河文明省部共建协同创新中心

本文对河南淅川徐家岭M11出土小口鼎及浴缶的有关资料作了详细介绍,并将其年代定在战国早期前段。进而就相关问题进行了讨论,认为鼎铭'长贎之'及仆儿钟铭'余贎乘儿得吉金镈铝'的'贎'皆应读作'赖';'大尹'为官名,初见于出土楚文字资料,可... 详细信息

本文对河南淅川徐家岭M11出土小口鼎及浴缶的有关资料作了详细介绍,并将其年代定在战国早期前段。进而就相关问题进行了讨论,认为鼎铭'长贎之'及仆儿钟铭'余贎乘儿得吉金镈铝'的'贎'皆应读作'赖';'大尹'为官名,初见于出土楚文字资料,可补文献记载之阙;该墓的墓主应系男性,即小口鼎铭中的'■大尹嬴',而非过去所认为的M10的墓主薳子昃之妻蔿夫人■,小口鼎与浴缶分别系其二位夫人■与巠的器物。

关键词： ■夫人■鼎 ■夫人巠浴缶 ■大尹赢

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“邛”“江”考辨

中国历史地理论丛 2020年第1期35卷 154-158页

作者：肖启荣黄锦前河南大学黄河文明与可持续发展研究中心暨黄河文明省部共建协同创新中心河南开封475001 兰州大学历史文化学院甘肃兰州750000

江、黄是周代南土地区相邻的两个嬴姓诸侯国,古书亦常并称,如《左传》僖公二年:"秋,盟于贯,服江、黄也。"僖公五年:"楚斗谷于菟灭弦,弦子奔黄。于是江、黄、道、柏方睦于齐,皆弦姻也。弦子恃之而不事楚,又不设备,故亡。"江在今河南省正... 详细信息

江、黄是周代南土地区相邻的两个嬴姓诸侯国,古书亦常并称,如《左传》僖公二年:"秋,盟于贯,服江、黄也。"僖公五年:"楚斗谷于菟灭弦,弦子奔黄。于是江、黄、道、柏方睦于齐,皆弦姻也。弦子恃之而不事楚,又不设备,故亡。"江在今河南省正阳县东南、息县西南一带(2),周襄王二十三年(前623)灭于楚。

关键词：周襄王诸侯国河南省正阳县《左传》