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Advanced Photonics 2023年第6期5卷 72-82页

作者： Shujun Liu Ruitao Ma Zejie Yu Yaocheng Shi Daoxin Dai Zhejiang University College of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsState Key Laboratory for Extreme Photonics and InstrumentationHangzhouChina Jiaxing Key Laboratory of Photonic Sensing and Intelligent Imaging JiaxingChina Zhejiang University Jiaxing Research InstituteIntelligent Optics and Photonics Research CenterJiaxingChina Zhejiang University Ningbo Research InstituteNingboChina

A silicon-based digitally tunable positive/negative dispersion controller(DC)is proposed and realized for the first time using the cascaded bidirectional chirped multimode waveguide gratings(CMWGs),achieving positive and negative dispersion by switching the light propagation direction.A 1×2 Mach-Zehnder switch(MZS)and a 2×1 MZS are placed before and after to route the light path for realizing positive/negative *** device has Q stages of identical bidirectional CMWGs with a binary *** the digital tuning is convenient and scalable,and the total dispersion accumulated by all the stages can be tuned digitally from−(2^(Q)−1)D0 to(2^(Q)−1)D_(0) with a step of D_(0) by controlling the switching states of all 2×2 MZSs,where D_(0) is the dispersion provided by a single bidirectional CMWG ***,a digitally tunable positive/negative DC with Q=4 is designed and *** CMWGs are designed with a 4-mm-long grating section,enabling the dispersion D_(0) of about 4.16 ps∕nm in a 20-nm-wide *** dispersion is tuned from−61.53 to 63.77 ps∕nm by switching all MZSs appropriately,and the corresponding group delay is varied from−1021 to 1037 ps.

关键词： silicon photonics dispersion tuning digital tuning multimode waveguide grating

Dual-wavelength f iber grating laser in linear overlapping cavity

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Chinese optics Letters 2013年第12期11卷 17-21页

作者：丁亚茜漆云凤刘源贾福阳王可嘉 Xijia Gu 周军 Key Laboratory of Space Laser Communication and Testing Technology Shanghai Institute of Optics and Fine MechanicsChinese Academy of Sciences Wuhan National Laboratories for Opto-electronics Huazhong University of Science & Technology Department of Electrical and Computer Engineering Ryerson University350 Victoria St.

We report a switchable dual-wavelength fiber grating laser in linear overlapping cavity. The laser features two overlapping cavities sharing a single Yb-doped gain medium fiber and two sets of fiber Bragg gratings. A coiling fiber setup is inserted into the 1035 nm laser cavity. Given that the bending loss is inversely related to the bending radius, the cavity loss of 1035-nm can be modulated. Modulating the bending loss facilitates the switching of the fiber grating laser to a single-or dual-wavelength output at 1030 or 1035 nm and convenient tuning of the power ratio of the two wavelengths. An approximately 152.6-mW output power and up to 38-dB polarization extinction ratio are observed. The simultaneous lasing at I030 and 1035 nm is a qualified seeder source for amplification to high power scale and can be applied to difference frequency generation of a terahertz signal. This dual-wavelength fiber grating laser is a potential pump source for generating terahertz radiation using a novel approach.

关键词： Fiber Bragg gratings Optical frequency conversion Pumping (laser)

Remote sensing of trace Na element in sea salt aerosol with a sensitivity level of 10 pg/m^(3)[Invited]

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Chinese optics Letters 2024年第9期22卷 26-30页

作者： Yuezheng Wang Jiayun Xue Nan Zhang Lu Sun Binpeng Shang Jiewei Guo Zhi Zhang Pengfei Qi Lie Lin Weiwei Liu institute of Modern optics Eye InstituteNankai UniversityTianjin 300350China Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology Tianjin 300350China School of Integrated Circuit Science and Engineering Tianjin University of TechnologyTianjin 300384China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Tianjin 300350China

We have developed a remote sea salt aerosol fluorescence spectroscopy system integrating a high-power industrial-grade femtosecond laser to enhance detection sensitivity and precision in complex *** system successfully detects sea salt aerosol particles,achieving a detection limit of 0.015 ng/m^(3) for neutral Na element(Na I)at 589 nm,with a detection range of 30 *** findings demonstrate significant improvements in remote aerosol monitoring,addressing previous challenges in long-range and high-precision sensing with a detection accuracy previously unattainable below 10 ng/m^(3).

关键词： femtosecond laser filamentation sea salt aerosol remote sensing amplified spontaneous emission

Direct visualization of phase-matched efficient second harmonic and broadband sum frequency generation in hybrid plasmonic nanostructures

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Light(Science & Applications) 2020年第1期9卷 276-285页

作者： Zhe Li Brian Corbett Agnieszka Gocalinska Emanuele Pelucchi Wen Chen Kevin M.Ryan Pritam Khan Christophe Silien Hongxing Xu Ning Liu Department of Physics and Bernal institute University of LimerickLimerickIreland The School of Physics and Technology Institute for Advanced Studies and Center for Nanoscience and NanotechnologyWuhan UniversityWuhan 430072China Tyndall National institute University College CorkCorkIreland institute of Physics Ecole Polytechnique Federale de Lausanne(EPFL)CH1015 LausanneSwitzerland Department of Chemical Sciences and Bernal institute University of LimerickLimerickIreland

Second harmonic generation and sum frequency generation(SHG and SFG)provide effective means to realize coherent light at desired frequencies when lasing is not easily *** have found applications from sensing to quantum optics and are of particular interest for integrated photonics at communication *** the footprints of nonlinear components while maintaining their high up-conversion efficiency remains a challenge in the miniaturization of integrated *** we explore lithographically defined AlGaInP nano(micro)structures/Al_(2)O_(3)/Ag as a versatile platform to achieve efficient SHG/SFG in both waveguide and resonant cavity configurations in both narrow-and broadband infrared(IR)wavelength regimes(1300-1600 nm).The effective excitation of highly confined hybrid plasmonic modes at fundamental wavelengths allows efficient SHG/SFG to be achieved in a waveguide of a cross-section of 113 nm×250 nm,with a mode area on the deep subwavelength scale(λ2/135)at fundamental ***,we demonstrate direct visualization of SHG/SFG phase-matching evolution in the *** together with mode analysis highlights the origin of the improved SHG/SFG *** also demonstrate strongly enhanced SFG with a broadband IR source by exploiting multiple coherent SFG processes on 1μm diameter AlGaInP disks/Al_(2)O_(3)/Ag with a conversion efficiency of 14.8%MW^(−1) which is five times the SHG value using the narrowband IR *** both configurations,the hybrid plasmonic structures exhibit>1000 enhancement in the nonlinear conversion efficiency compared to their photonic *** results manifest the potential of developing such nanoscale hybrid plasmonic devices for state-of-the-art on-chip nonlinear optics applications.

关键词： waveguide harmonic optics

150-W Tm3＋-Doped Fiber Lasers With Different Cooling Techniques and Output Couplings

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Chinese Physics Letters 2010年第10期27卷 114-116页

作者：唐玉龙徐剑秋陈伟李诗愈 Shanghai institute of optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 Department of Physics Shanghai Jiaotong University Shanghai 200240 State Key Lab of Optical Communication Technology and Networks Wuhan 430074 Fiberhome Telecommunication Tech. Co. Ltd Wuhan 430074

A home-made double-clad Tm3＋ -doped silica fiber laser with over 150-W output power is reported. Pumped with a diode bar at 793nm, the fiber laser is operated at 2.04μm with a slope efficiency of 56.3%. A quantum efficiency of 〉 140% is achieved owing to the efficient cross-relaxation process in heavily Tm3＋-doped fibers. By using different fiber-cooling techniques, the slope efficiency shows a deviation over 10%. The influence of output coupling on the laser characteristics is also investigated.

关键词：

A mobile polar atmospheric parameter measurement system:Ⅱ. First atmospheric turbulence observation at Antarctic Taishan Station

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Advances in Polar Science 2015年第2期26卷 140-146页

作者： TIAN Qiguo JIANG Peng WU Xiaoqing JIN Xinmiao LU Shan JI Tuo CHAI Bo ZHANG Shaohua ZHOU Hongyan Polar Research institute of China Key Laboratory for Research in Galaxies and Cosmology Department of AstronomyUniversity of Science and Technology of ChinaChinese Academy of Sciences Key Laboratory of Atmospheric Composition and Optical Radiation Anhui Institute of Optics and Fine MechanicsChinese Academy of Sciences

This is the second paper of a series devoted to atmospheric optical turbulence Cn^2 observation using a mobile polar atmospheric parameter measurement system. We present the initial results of Cn^2 measurement at Antarctic Taishan Station using micro-thermal sensors and a three-dimensional sonic anemometer at height -2.0 m above the snow surface. The site testing experiments were carried out during the 30th Chinese National Antarctic Research Expedition （CH1NARE）. We collected about 1 000 h of data between 30 December 2013 and 10 February 2014. The C,： curve exhibits clear daily structures, with two peaks around midnight and midday and two troughs around 7：30 and 17：00 local time （UTC＋5）. The mean C,2 is 2.7×10^-15 m^-2/3 and the 25th and 75th percentiles of the C,2 cumulative distribution are 9.6×10^-16 m^-2/3 and 6.2×10^-15 m^-2/3, respectively. Meteorological parameters such as temperature, relative humidity, wind speed, and air pressure are also presented.

关键词： micro-thermal sensors three-dimensional sonic anemometer turbulence site testing Antarctic Plateau,Kunlun Station Taishan Station

Ultrafast optical modulation of the fluorescence from a single-photon emitter in silicon carbide

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Photonics Research 2024年第5期12卷 941-946页

作者： MENGTING HE YUJING CAO JUNJIE LIN ZHIPING JU BOTAO WU E WU State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200241China Photon Technology(Zhejiang)Co. Ltd.Jiaxing 314100China National Key Laboratory of Materials for Integrated Circuits Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200000China Department of Physics and Shanghai Key Laboratory for Magnetic Resonance East China Normal UniversityShanghai 200241China Chongqing Key Laboratory of Precision optics Chongqing Institute of East China Normal UniversityChongqing 401120China Collaborative Innovation Center of Extreme optics Shanxi UniversityTaiyuan 030006China

The quest for the room-temperature optical transistor based on nonlinearities in single atoms or molecules is attracting a lot of *** this work,a single-photon emitter in cubic silicon carbide is verified that can operate as an optical switch at room temperature under pulsed green laser illumination with a near-infrared pulsed laser as the control *** demonstrated an ultrafast and reversible optical modulation with a high photoluminescence intensity suppression ratio up to 97.9%and a response time as short as 287.9±5.7 *** current development provides insights for high-precision and ultrafast optical switches,with possibilities for integration with emerging electronic installations to realize more intelligent photoelectric integrated devices.

关键词： emitter carbide photon

Turbulence-induced beam wandering during femtosecond laser filamentation

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Chinese optics Letters 2015年第7期13卷 27-31页

作者：曾涛高慧孙晓东刘伟伟 Key Laboratory of Optical Information Science and Technology Institute of Modern Optics Nankai UniversityMinistry of Education School of Science Tianjin Polytechnic University School of Electronics Information Engineering Tianjin Polytechnic University Cooperative Innovation Center of Terahertz Science University of Electronic Science and Technology

The influence of air turbulence on the transverse wandering of a single femtosecond laser filament is studied by numerical simulation. The results show that the average transverse displacement of the single filament （StI is proportional to the square root of turbulent structure constant and the relations between （St} and the propa- gation distance can be fit by a power function. In addition, by using an axicon as a focusing optics, the wandering of a single filament is suggested to be stronger than the free-propagation case.

关键词： Laser beams Turbulence

All fiber tunable- or dual-wavelength Yb-doped fiber laser covering from dissipative soliton to dissipative soliton resonance

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Chinese optics Letters 2016年第4期14卷 34-38页

作者：王兆坤杜松涛王建华邹峰王子薇吴闻迪周军 Shanghai Key Laboratory of Solid State Laser and Application and Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China Graduate University of the Chinese Academy of Sciences Beijing 100049 China Department of Space and Command Academy of Equipment Beiing 101416 China

In this Letter, a simple and passively mode-locking Yb-doped all fiber laser using a nonlinear polarization ro- tation technique operating under dissipative soliton （DS） or dissipative soliton resonance （DSR） conditions is proposed. Furthermore, using a combination of a bandpass filter and a Loyt filter, tunable single-wavelength or dual-wavelength operation under two different conditions is realized, respectively. The tunable single- wavelength DS laser has a 5 nm tuning range from 1029 to 1034 nm with a pulse width of 110 ps. The tunable single-wavelength DSR operation laser has a range of 4 nm. In-depth research on the mechanism of the con- version between DS and DSR is carried out. Particularly, under dual-wavelength DSR operation, the obtained step-like pulses consist of two rectangular pulses with different energies. This work could help give a deeper insight into normal dispersion pulses.

关键词： DSR All fiber tunable Yb mode