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A High-Pulse-Energy High-Beam-Quality Tunable Ti:Sapphire laser Using a Prism-Dispersion Cavity

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Chinese Physics Letters 2017年第3期34卷 45-48页

作者：许昌代世波郭川卞奇左军卫夏元钦高宏伟王志敏薄勇宗楠张盛彭钦军许祖彦 National Key lab.of Science and Technology on Tunable laser Harbin Institute of Technology Key lab.of Solid State laser Technical Institute of Physics and ChemistryChinese Academy of Sciences University of Chinese Academy of Sciences Key lab.of Functional Crystal and laser Technology Technical Institute of Physics and ChemistryChinese Academy of Sciences

A high-pulse-energy high-beam-quality tunable Ti：sapphire laser pumped by a frequency-doubled Nd：YAG laser is demonstrated. Using a fused-silica prism as the dispersion element, a tuning range of 740-855 nm is obtained. At an incident pump energy of 774mJ, the maximum output energy of 104mJ at 790nm with a pulse width of 100μs is achieved at a repetition rate of 5 Hz. To the best of our knowledge, it is the highest pulse energy at 790 nm with pulse width of hundred micro-seconds for an all-solid-state laser. The linewidth of output is 0.5 nm, and the beam quality factor M2 is 1.16. The high-pulse-energy high-beam-quality tunable Ti：sapphire laser in the range of 740-855 nm can be used to establish a more accurate and consistent absolute scale of second-order optical-nonlinear coefficients for KBe2BO3F2 measured in a wider wavelength range and to assess Miller＇s rule quantitatively.

关键词： Ti A High-Pulse-Energy High-Beam-Quality Tunable Ti:Sapphire laser Using a Prism-Dispersion Cavity

Pulsed laser deposited Al-doped ZnO thin films for optical applications

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Progress in Natural Science:Materials International 2015年第1期25卷 12-21页

作者： Gurpreet Kaur Anirban Mitra K.L.Yadav High Power laser lab Department of PhysicsIndian Institute of Technology Roorkee

Highly transparent and conducting Al-doped Zn O(Al:Zn O) thin films were grown on glass substrates using pulsed laser deposition *** profound effect of film thickness on the structural, optical and electrical properties of Al:Zn O thin films was observed. The X-ray diffraction depicts c-axis, plane(002) oriented thin films with hexagonal wurtzite crystal structure. Al-doping in Zn O introduces a compressive stress in the films which increase with the film thickness. AFM images reveal the columnar grain formation with low surface roughness. The versatile optical properties of Al:Zn O thin films are important for applications such as transparent electromagnetic interference(EMI) shielding materials and solar cells. The obtained optical band gap(3.2–3.08 e V) was found to be less than pure Zn O(3.37 e V) films. The lowering in the band gap in Al:Zn O thin films could be attributed to band edge bending phenomena. The photoluminescence spectra gives sharp visible emission peaks, enables Al:Zn O thin films for light emitting devices(LEDs) applications. The current–voltage(I–V) measurements show the ohmic behavior of the films with resistivity(ρ) 10-3Ω cm.

关键词： Al:ZnO thin films Transparent conducting oxide(TCO) Pulsed laser Deposition(PLD) Optical properties Photoluminescence(PL)

Hybrid-integrated 200 Gb/s REC-DML array transmitter based on photonic wire bonding technology

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CHINESE OPTICS LETTERS 2024年第8期22卷 081401-081401页

作者： Ma, Yuxin Zhao, Jie Yang, Tongtong Mei, Yipeng Sun, Zhenxing Lu, Jun Li, Shaobo Ma, Xiang Chen, Xiangfei Nanjing Univ Key Lab Intelligent Opt Sensing & Manipulat Minist Educ Nanjing 210023 Peoples R China Nanjing Univ Natl Lab Solid State Microstruct Nanjing 210023 Peoples R China Nanjing Univ Coll Engn & Appl Sci Nanjing 210023 Peoples R China Nanjing Univ Inst Opt Commun Engn Nanjing 210023 Peoples R China Nanjing Univ Nanjing Univ Tongding Joint Lab Large Scale Photon Nanjing 210023 Peoples R China China Elect Technol Grp Corp Res Inst 54 Opt Commun Res & Dev Ctr Shijiazhuang 050081 Peoples R China

An 8-channel hybrid-integrated chip for 200 Gb/s (8 x 25 Gb/s) signal transmission has been demonstrated. The channels are all within the O-band, and with a spacing of 800 GHz. The core of this chip is a monolithic integrated multi-wavelength laser array of 8 directly-modulated distributed feedback (DFB) lasers. By using the reconstruction equivalent chirp technique, multi-wavelength integration and asymmetric phase shift structures are achieved in the laser array. The output laser beams of the array are combined by a planar light-wave circuit, which is hybrid-integrated with the laser array by photonic wire bonding. Experiment results of this transmitter chip show good single-mode working of each unit laser, with a side- mode suppression ratio above 50 dB, and the modulation bandwidth is above 20 GHz. Clear eye diagrams are obtained in the lasers for 25 Gb/s non-return-to-zero modulation, which implies a total 200 Gb/s transmission rate for the whole chip.

关键词： direct modulation laser array reconstruction equivalent chirp photonic wire bonding hybrid integration laser ARRAY SEMICONDUCTOR-laser

C-NOT gate based on ultracold Rydberg atom interactions

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Science China(Physics,Mechanics & Astronomy) 2013年第11期56卷 2134-2137页

作者： RASHID Muhammad MAARTEN Hoogerland YASIR Jamil Department of Physics University of Auckland Private Bag 92019 Auckland New Zealand Education Department Government of the Punjab Pakistan laser spectrosc.py lab. Department of Physics University of Agriculture Faisalabad-38040 Pakistan

The Rydberg states of neutral atoms are strongly polarisable and possess long lifetimes because of high energies which can lead to strong and long range dipole-dipole *** energy levels corresponding to these states are shifted because of dipole-dipole interactions and can be used to block transitions of more than one excitation in the Rydberg *** reputed Rydberg blockade is obtained when the excitation is shifted out of resonance by these *** induced transparency(EIT)is sensitive to a small *** large distances,up to several micrometers,the interactions can interrupt the EIT *** we investigate a novel scheme based on EIT and Rydberg blockade and performed a simulation of a controlled-NOT(C-NOT)quantum gate which is critical for quantum computation by using neutral atoms.

关键词： Rydberg atoms dipole-dipole interactions fidelity quantum gates

High Power Pulse laser Reflection Sequence Combination with a Fast Steering Mirror

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Chinese Physics Letters 2019年第7期36卷 52-55页

作者： Ke-Ling Gong Jian Xu Lin Zhang Ya-Ding Guo Bao-Shan Wang Yang Li Shuai Li Zhong-Zheng Chen Lei Yuan Yang Kou Yi-Ting Xu Qin-Jun Peng Key lab.of Solid State laser Technical Institute of Physics and ChemistryChinese Academy of Sciences University of Chinese Academy of Sciences Key lab.of Function Crystal and laser Technology Technical Institute of Physics and ChemistryChinese Academy of Sciences

We propose and demonstrate a new approach for a high power pulse laser reflection sequence combination with a fast steering mirror(FSM). This approach possesses significant advantages for lasers combining with a variety of output power, wavelength, pulse duration, repetition rates and polarization. The maximum number of laser routes participating in combination principally depends on the FSM’s adjustment time of the step response, lasers’ repetition rates and pulse duration. A proof-of-principle experiment is performed with two 2-kW level pulsed beams. The results indicate that the combined beam has an excellent pointing stability with rms pointing jitter^8.5μrad. Meanwhile, a high combining efficiency of 98.6% is achieved with maintaining good beam quality.

关键词： demonstrate a new approach sequence combination good beam quality

The 10 kW Level High Brightness Face-Pumped Slab.Nd:YAG Amplifier with a Hybrid Cooling System

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Chinese Physics Letters 2019年第4期36卷 35-38页

作者： Shuai Li Ya-Ding Guo Zhong-Zheng Chen Lin Zhang Ke-Ling Gong Zhi-Feng Zhang Bao-Shan Wang Jian Xu Yi-Ting Xu Lei Yuan Yang Kou Yang Liu Yan-Yong Lin Qin-Jun Peng Zu-Yan Xu Key lab.of Solid State laser Technical Institute of Physics and Chemistry Chinese Academy of Sciences University of Chinese Academy of Sciences Key lab.of Function Crystal and laser Technology Technical Institute of Physics and ChemistryChinese Academy of Sciences

We demonstrate a high power, high brightness, slab.amplifier based on face-pumped Nd:YAG slab.gain modules,having a high efficient hybrid cooling system of the conduction cooling and forced convection cooling. Using a single gain module, a laser output power up to 4.5 kW with a remarkable optical-optical conversion efficiency of 51% is realized, indicating an excellent lasing performance of the Nd:YAG slab.module. The amplifier operates at a repetition rate of 700 Hz and delivers a maximum average output power exceeding 10.5 kW with pulse duration of 150us. A good beam quality factor is measured to be β = 1.9. To the best of our knowledge, this is the highest brightness for a 10 kW level Nd:YAG slab.amplifier.

关键词： System Brightness power

Spin transport of half-metal Mn_(2)X_(3) with high Curie temperature:An ideal giant magnetoresistance device from electrical and thermal drives

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Frontiers of physics 2024年第4期19卷 125-135页

作者： Bin Liu Xiaolin Zhang Jingxian Xiong Xiuyang Pang Sheng Liu Zixin Yang Qiang Yu Honggen Li Sicong Zhu Jian Wu Hubei Province Key lab.ratory of Systems Science in Metallurgical Process The State Key Laboratory for Refractories and MetallurgyCollaborative Innovation Center for Advanced SteelsInternational Research Institute for Steel TechnologyWuhan University of Science and TechnologyWuhan 430081China Key lab.ratory of Artificial Micro-and Nano-structures of Ministry of Education and School of Physical and Technology Wuhan UniversityWuhan 430072China College of Advanced Interdisciplinary Studies Nanhu Laser LaboratoryNational University of Defense TechnologyChangsha 410073China Department of Mechanical Engineering National University of SingaporeSingapore 117575Singapore i-lab.Key lab.ratory of Nanodevices and Applications&Key lab.ratory of Nanophotonic Materials and Devices Suzhou Institute of Nano-Tech and NanoBionicsChinese Academy of SciencesSuzhou 215123China Institute of Optical Science and Technology School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China

Currently,magnetic storage devices are encountering the problem of achieving lightweight and high integration in mobile computing devices during the information *** a result,there is a growing urgency for twodimensional half-metallic materials with a high Curie temperature(TC).This study presents a theoretical investigation of the fundamental electromagnetic properties of the monolayer hexagonal lattice of Mn_(2)X_(3)(X=S,Se,Te).Additionally,the potential application of Mn_(2)X_(3) as magneto-resistive components is *** three of them fall into the category of ferromagnetic *** particular,the Monte Carlo simulations indicate that the TC of Mn2S3 reachs 381 K,noticeably greater than room *** findings present notable advantages for the application of Mn2S3 in spintronic ***,a prominent spin filtering effect is apparent when employing non-equilibrium Green’s function simulations to examine the transport *** resulting current magnitude is approximately 2×10^(4) nA,while the peak gigantic magnetoresistance exhibits a substantial value of 8.36×10^(16)%.It is noteworthy that the device demonstrates a substantial spin Seebeck effect when the temperature differential between the electrodes is *** brief,Mn_(2)X_(3) exhibits outstanding features as a highTC half-metal,exhibiting exceptional capabilities in electrical and thermal drives spin ***,it holds great potential for usage in spintronics applications.

关键词： half-metals Mn_(2)X_(3) high Curie temperature electrical and thermal GMR

Special issue on meta-lenses

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Opto-Electronic Science 2024年第09期 4-5页

作者： Din Ping Tsai Shumin Xiao Department of Electrical Engineering City University of Hong Kong Centre for Biosystems Neuroscience and Nanotechnology City University of Hong Kong The State Key lab.ratory of Terahertz and Millimeter Waves City University of Hong Kong State Key lab.ratory on Tunable laser Technology Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System Shenzhen Graduate School Harbin Institute of Technology

About a decade ago, the unveiling of generalized Snell’s laws heralded a significant advancement in nanophotonics, leading to the emergence of metasurfaces1-6. This revolutionary milestone has set the stage for the development of advanced optical devices, particularly metalens7-11. Researchers are already well-versed in the fundamental principles and functions of meta-lenses, which exemplify the concept of phase discontinuities with clarity.

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Unveiling of Terahertz Emission from ultrafast Demagnetization and the Anomalous Hall Effect in a Single Ferromagnetic Film

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Chinese Physics Letters 2024年第4期41卷 45-50页

作者：蓝志强李章顺徐浩然刘凡金钻明彭滟朱亦鸣 Terahertz Technology Innovation Research Institute Terahertz Spectrum and Imaging Technology Cooperative Innovation CenterShanghai Key Lab of Modern Optical SystemUniversity of Shanghai for Science and TechnologyShanghai 200093China

Using THz emission spectrosc.py,we investigate the elementary spin dynamics in ferromagnetic single-layer Fe on a sub-picosecond *** demonstrate that THz radiation changes its polarity with reversal of the magnetization applied by the external magnetic *** addition,it is found that the sign of THz polarity excited from different sides is defined by the thickness of the Fe layer and Fe/dielectric *** on the thickness and symmetry dependences of THz emission,we experimentally distinguish between the two major contributions:ultrafast demagnetization and the anomalous Hall *** experimental results not only enrich understanding of THz electromagnetic generation induced by femtosecond laser pulses but also provide a practical way to access laser-induced ultrafast spin dynamics in magnetic structures.

关键词： magnetic magnetization polarity