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Chinese Physics B 2010年第11期19卷 436-440页

作者：耿优福谭晓玲李学金姚建铨 College of Physics Science and technology Shenzhen Key Laboratory of Sensor TechnologyShenzhen University College of Precision Instrument and Optoelectronics Engineering Institute of Laser and OptoelectronicsTianjin University Faculty of Science Ningbo University

Using a double resonant KTiOPO4 （KTP） intracavity optical parametric oscillator operating at degenerated point of 2 μm, we demonstrate a unique mid-infrared source based on difference frequency generation in GaSe crystal. The output tuning range is 8.42-19.52 μm, and a peak power of 834 W for type-Ⅰ phase matching scheme and 730 W for type-Ⅱ phase matching scheme are achieved. Experimental results show that this oscillator is a good alternative to the generator of a compact and tabletop mid-infrared radiation with a widely tunable range.

关键词： mid-infrared radiation difference frequency generation optical parametric oscillator phase matching scheme

Femtosecond laser-induced periodic surface structures on hard and brittle materials

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Science China(Technological Sciences) 2024年第1期67卷 19-36页

作者： ZHAO GuoXu WANG Gong LI YunFei WANG Lei LIAN YuDong YU Yu ZHAO Hui WANG YuLei LU ZhiWei Center for advanced laser technology Hebei University of TechnologyTianjin 300401China Hebei key laboratory of advanced laser technology and Equipment Tianjin 300401China State key laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China School of Information and Electrical Engineering Hebei University of EngineeringHandan 056038China

Hard and brittle materials have high hardness,excellent optical stability,chemical stability,and high thermal ***,they have huge application potential in various fields,such as optical components,substrate materials,and quantum information,especially under harsh conditions,such as high temperatures and high *** laser direct writing technology has greatly promoted the development of femtosecond laser-induced periodic surface structure(Fs-LIPSS or LIPSS by a femtosecond laser)applications of hard and brittle materials due to its high precision,controllability,and three-dimensional processing *** far,LIPSSs have been widely used in material surface treatment,optoelectronic devices,and ***,a consensus has not been reached regarding the formation mechanism of LIPSSs on hard and brittle *** this paper,three widely accepted LIPSS formation mechanisms are introduced,and the characteristics and applications of LIPSSs on diamonds,silicon,silicon carbide,and fused silica surfaces in recent years are *** addition,the application prospects and challenges of LIPSSs on hard and brittle materials by a femtosecond laser are discussed.

关键词： laser-induced periodic surface structures hard and brittle materials femtosecond laser

High Energy Yb∶YAG Regenerative Amplifier

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激光与光电子学进展 2021年第17期58卷 438-442页

作者： Zhu Wentao He Huijun Yu JunLin Qingdian Guo Xiaoyang Zhou Cangtao Ruan Shuangchen shenzhen key laboratory of ultraintense laser and advanced material technology Center for Advanced Material Diagnostic TechnologyCollege of Engineering PhysicsShenzhen Technology UniversityShenzhenGuangdong 518118China College of Physics and Optoelectronic Engineer Shenzhen UniversityShenzhenGuangdong 518060China

A diode pumped high energy Yb∶YAG rod regenerative amplifier was demonstrated with a maximum energy of22.3 m J,excellent energy stability(~0.8%root mean square),and beam quality(M2<1.2)at 10 Hz repetition *** the bes... 详细信息

关键词： laser optics high energy Yb:YAG rod regenerative amplifier

Measuring the magnetic topological spin structure of light using an anapole probe

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Light(Science & Applications) 2022年第10期11卷 2503-2511页

作者： Fanfei Meng Aiping Yang Kang Du Fengyang Jia Xinrui Lei Ting Mei Luping Du Xiaocong Yuan Nanophotonics Research Centre Institute of Microscale OptoelectronicsShenzhen University518060 ShenzhenChina MOE key laboratory of material Physics and Chemistry under Extraordinary Conditions and Shaanxi key laboratory of Optical Information technology School of Physical Science and TechnologyNorthwestern Polytechnical University710129 Xi'anChina

Topological spin structures of light,including the Skyrmion,Meron,and bi-Meron,are intriguing optical phenomena that arise from spin-orbit *** have promising potential applications in nano-metrology,data storage,super-resolved imaging and chiral *** from the electric part of optical spin,of equal importance is the magnetic part,particularly the H-type electromagnetic modes for which the spin topological properties of the field are dominated by the magnetic ***,their observation and measurement remains absent and faces difficult ***,we design a unique type of anapole probe to measure specifically the photonic spin structures dominated by magnetic *** probe is composed of an Ag-core and Si-shell nanosphere,which manifests as a pure magnetic dipole with no electric *** effectiveness of the method was validated by characterizing the magnetic field distributions of various focused vector *** was subsequently employed to measure the magnetic topological spin structures,including individual Skyrmions and Meron/Skyrmion lattices for the first *** proposed method may be a powerful tool to characterize the magnetic properties of optical spin and valuable in advancing spin photonics.

关键词： field. topological dipole

Atomic study of hydrogen behaviors at∑3(111)grain boundary in equiatomic CoCrNi and CoCrNiFe alloys

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Tungsten 2022年第3期4卷 239-247页

作者： Hua-Qing Guan Yan-Mei Jing Shao-Song Huang key laboratory of material Modification by laser Ion and Electron Beams(Dalian University of Technology)Ministry of EducationDalian116024China

High-entropy alloys are potential advanced structural materials for applications in nuclear energy due to their proved high irradiation ***,exposing components made of structure materials to service conditions under certain nuclear environments may induce hydrogen embrittlement(HE)as one of the typical failure *** this work,we performed density functional theory(DFT)calculations to examine the role of specific element species in HE mechanism in CoCrNi and CoCrNiFe *** solution energy,binding energy and diffusion barrier of H atoms at∑3 GBs(GBs is short for grain boundaries)are *** on the DFT data,we found that Cr limits the H atom to a specific potential position,thus suppresses H *** dipole moment interaction between H and Fe atoms weakens the binding of H *** lattice distortion effect-induced trapping for H provides higher H diffusion barriers at∑3 GBs than that in pure Ni.

关键词： Hydrogen embrittlement Grain boundary DFT High-entropy alloy

Refractive Index and Strain Sensitivities of a Long Period Fiber Grating

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Photonic Sensors 2014年第1期4卷 92-96页

作者： Quandong Huang Yongqin Yu Zhilong Ou Xue Chen Jishun Wang Peiguang Yan Chenlin Du College of Electronic Science and technology Shenzhen UniversityShenzhen518060China shenzhen key laboratory of laser Engineering Shenzhen518060China College of Physics Science and technology Shenzhen UniversityShenzhen518060China

A long period fiber grating （LPFG） fabricated upon the all-solid photonic bandgap fiber by CO2 laser irradiation was investigated, and its resonance wavelength was at 1335.76nm with a modulation depth of 15dB and a 3-dB bandwidth of 2.6nm. We studied its strain, temperature, and index sensor characteristics, the strain sensitivity of 0.992 pm/m was obtained by using linear fit, and the relationship between the refractive index and wavelength obeyed the distribution of quadratic function. Also, we demonstrated its temperature response was relatively insensitive （21.51 pm/~C）.

关键词： Long period fiber grating strain sensors index sensors

Numerical simulation on rapid melting and nonequilibrium solidification of pure metals and binary alloys

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中国有色金属学会会刊：英文版 2002年第6期12卷 1076-1080页

作者：惠希东陈国良杨院生胡壮麒 State key laboratory for advanced Metals and materials University of Science and Technology Beijing Shenyang National laboratory for material Research Institute of Metal Research Chinese Academy of Sciences

A heat and mass transfer modelling containing phase transformation dynamics is made for pure metals and binary alloys under pulsed laser processing. The nonequilibrium effects of processing parameters and physical properties are evaluated on the melting and solidification of pure metals (Al, Cu, Fe and Ni) and Al Cu alloys. It is shown that the energy intensity of laser beam and physical properties of metals and the solute concentration of alloys have important effect on the interface temperature, melting and solidification velocity, melting depth and non equilibrium partition coefficient. This situation is resulted from the interaction of heat transfer, redistribution of solute, solute trapping and growth kinetics.

关键词：快速熔化非平衡态凝固生长动力学激光处理数学模拟二元合金纯金属

Low threshold fiber taper coupled rare earth ion-doped chalcogenide microsphere laser

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Chinese Physics B 2015年第4期24卷 237-240页

作者：李超然戴世勋张勤远沈祥王训四张培晴路来伟吴越豪吕社钦 laboratory of Infrared material and Devices Advanced Technology Reasearch Institute Ningbo University State key laboratory of Luminescence materials and Devices and Institute of Optical Communication materials South China University of Technology

We report the applications of a low-cost and environmentally friendly chalcogenide glass, 75GeS2-15Ga2S3-10CsI, in building active microsphere laser oscillators. A silica fiber taper is used as the coupling mechanism. With an 808-nm laser diode as a pump source, we show that a high-Q （-, 6× 10^4） laser mode could be obtained from a 75-μm diameter microsphere that is coupled with a 1.77-μm waist-diameter fiber taper. The threshold of the incident pump power is 1.39 mW, which is considerably lower than those of previously reported free-space coupled chalcogenide microsphere lasers. We also note an apparent enhancement in laser power generated from this chalcogenide microsphere laser.

关键词： chalcogenide microspheres laser whispering gallery modes

In-situ encapsulation ofα-Fe_(2)O_(3) nanoparticles into ZnFe_(2)O_(4) micro-sized capsules as high-performance lithium-ion battery anodes

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Journal of materials Science & technology 2021年第16期75卷 110-117页

作者： Wei Wu Yongshan Wei Hongjiang Chen keyan Wei Zhitong Li Jianhui He Libo Deng Lei Yao Haitao Yang shenzhen key laboratory of Special Functional materials Shenzhen Engineering Laboratory for Advanced Technology of CeramicsGuangdong Research Center for Interfacial Engineering of Functional MaterialsCollege of Materials Science and EngineeringShenzhen UniversityShenzhen 518060China College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060China

Transition metal oxides as anode materials for high-performance lithium-ion batteries suffer from severe capacity decay,originating primarily from particle pulverization upon volume expansion/shrinkage and the intrinsically sluggish electron/ion ***,in-situ encapsulation ofα-Fe_(2)O_(3) nanoparticles into micro-sized ZnFe_(2)O_(4) capsules is facilely fulfilled through a co-precipitation process and followed by heat-treatment at optimal calcination *** porous ZnFe_(2)O_(4) scaffold affords a synergistic confinement effect to suppress the grain growth ofα-Fe2 O3 nanocrystals during the calcination process and to accommodate the stress generated by volume expansion during the charge/discharge process,leading to an enhanced interfacial conductivity and inhibit electrode pulverization and mechanical failure in the active *** these merits,the preparedα-Fe_(2)O_(3)/Fe_(2)O_(4) composite delivers prolonged cycling stability and improved rate capability with a higher specific capacity than soleα-Fe_(2)O_(3) and Fe_(2)O_(4).The discharge capacity is retained at 700 mAh g-1 after 500 cycles at 200 mA g^(-1) and 940 mAh g^(-1) after 50 cycles at 100 m A g^(-1).This work provides a new perspective in designing transition metal oxides for advanced lithium-ion batteries with superior electrochemical properties.

关键词： α-Fe_(2)O_(3)/ZnFe_(2)O_(4)ceramic composite Co-precipitation process Confinement effect Interfacial effect Grain growth High conductivity Lithium-ion battery anodes

Efficient Diode-Pumped Tm：YALO3 laser with a Pump Recycling Scheme

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Chinese Physics Letters 2007年第9期24卷 2597-2599页

作者：姚宝权李玉峰王月珠段小明赵广军宗艳花徐军 National key laboratory of Tunable laser technology Harbin Institute of Technology Harbin 150001 The laser and Optoelectronic Functional material P&D Center Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800

By using a pump recycling configuration, the maximum power of 8.1 W in the wavelength range 1.935-1.938 μm is generated by a 5-ram long Tm：YAIOa （4 at.%） laser operating at 18℃ with a pump power of 24 W. The highest slope efficiency of 42% is attained, and the pump quantum efficiency is up to 100%. The Tm：YAlO3 laser is employed as a pumping source of singly-doped Ho（1%）：GdV04 laser operating at room temperature, in which continuous wave output power of greater than 0.2 W at 2.05/μm is achieved with a slope efficiency of 9%.

关键词： coated conductor buffer layer self-epitaxy CeO2