Zaiwei Cai 1†Zihao Li 1Yingtao Zhang 1Chiyi Wei 1[ ... ]Zhongmin Yang 1,2,3,4,5,*
Author Affiliations
Abstract
1 South China University of Technology, School of Physics and Optoelectronics, Guangzhou, China
2 South China University of Technology, State Key Laboratory of Luminescent Materials, Guangzhou, China
3 South China University of Technology, Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices, Guangzhou, China
4 South China University of Technology, Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, Guangzhou, China
5 South China Normal University, Research Institute of Future Technology, Guangzhou, China
Laser processing with high-power ultrashort pulses, which promises high precision and efficiency, is an emerging new tool for material structuring. High repetition rate ultrafast laser highlighting with a higher degree of freedom in its burst mode is believed to be able to create micro/nanostructures with even more variety, which is promising for electrochemical applications. We employ a homemade high repetition rate ultrafast fiber laser for structuring metal nickel (Ni) and thus preparing electrocatalysts for hydrogen evolution reaction (HER) for the first time, we believe. Different processing parameters are designed to create three groups of samples with different micro/nanostructures. The various micro/nanostructures not only increase the surface area of the Ni electrode but also regulate local electric field and help discharge hydrogen bubbles, which offer more favorable conditions for HER. All groups of the laser-structured Ni exhibit enhanced electrocatalytic activity for HER in the alkaline solution. Electrochemical measurements demonstrate that the overpotential at 10 mA cm - 2 can be decreased as much as 182 mV compared with the overpotential of the untreated Ni (-457 mV versus RHE).
high repetition rate ultrafast laser burst mode operation nickel electrocatalyst hydrogen evolution reaction 
Advanced Photonics Nexus
2023, 2(5): 056009
Author Affiliations
Abstract
1 California State University Channel Islands, Camarillo, California, USA
2 Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
3 Central Laser Facility, STFC Rutherford Appleton Laboratory, Didcot, UK
4 Ludwig–Maximilians–Universität München, Garching, Germany
5 BELLA Center, Lawrence Berkeley National Laboratory, Berkeley, California, USA
6 Department of Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, Michigan, USA
7 Ergodic LLC, San Francisco, California, USA
8 Helmholtz-Zentrum Dresden – Rossendorf, Dresden, Germany
9 Queen’s University Belfast, Belfast, UK
The next generation of high-power lasers enables repetition of experiments at orders of magnitude higher frequency than what was possible using the prior generation. Facilities requiring human intervention between laser repetitions need to adapt in order to keep pace with the new laser technology. A distributed networked control system can enable laboratory-wide automation and feedback control loops. These higher-repetition-rate experiments will create enormous quantities of data. A consistent approach to managing data can increase data accessibility, reduce repetitive data-software development and mitigate poorly organized metadata. An opportunity arises to share knowledge of improvements to control and data infrastructure currently being undertaken. We compare platforms and approaches to state-of-the-art control systems and data management at high-power laser facilities, and we illustrate these topics with case studies from our community.
big data community organization control systems data management feedback loops high-power lasers high repetition rate metadata stabilization standards 
High Power Laser Science and Engineering
2023, 11(5): 05000e56
韩雪 1吕游 1彭嘉宁 1郭嘉祥 1[ ... ]李强 1,2,3,4,*
作者单位
摘要
1 北京工业大学 材料与制造学部激光工程研究院,北京 100124
2 跨尺度激光成型制造技术教育部重点实验室,北京 100124
3 北京市激光应用技术工程技术研究中心,北京 100124
4 激光先进制造北京市高等学校工程研究中心,北京 100124
目前1.5 μm LD泵浦的铒镱共掺玻璃/晶体被动调Q微型激光器广泛应用于激光测距、激光雷达等领域。随着激光器输出能量和重频的增加,玻璃面临突出的热效应问题,晶体的热导率是玻璃的10倍以上,有望能够实现比玻璃基质更大脉冲能量和更高重频的激光输出。文中报道了一种采用LD脉冲端面泵浦、铒镱共掺焦硅酸镥晶体为增益介质的1 537 nm被动调Q微型激光器。通过优化泵浦光斑大小、输出镜透过率与调Q晶体初始透过率相匹配,实现激光输出重频与泵浦重频一致。最终实现了输出重频为1 kHz、单脉冲能量35 μJ、脉冲宽度7 ns、峰值功率为5 kW、光束质量因子M2=1.33的激光输出。以及输出重频为10 kHz、单脉冲能量10 μJ、脉冲宽度10 ns、峰值功率为1 kW、光束质量因子M2=1.51的激光输出。结果表明,Er3+/Yb3+:Lu2Si2O7 晶体是实现高重频1.5 μm激光输出的优良介质。文中研究结果对LD脉冲端面泵浦的kHz铒镱共掺晶体被动调Q人眼安全微片激光器具有重要的参考意义。
微片激光器 被动调Q 高重频 Er3+/Yb3+:Lu2Si2O7晶体 脉冲泵浦 microchip laser passively Q-switched high repetition rate Er3+/Yb3+:Lu2Si2O7 crystal pulse pumped 
红外与激光工程
2023, 52(7): 20220811
杨天利 1,2,3杨晶 1,2,4,*周王哲 1,2,3李雪鹏 1,2,4[ ... ]彭钦军 1,2,4
作者单位
摘要
1 中国科学院 理化技术研究所 固体激光重点实验室,北京 100190
2 中国科学院 理化技术研究所 功能晶体与激光技术重点实验室,北京 100190
3 中国科学院大学,北京 100049
4 齐鲁中科光物理与工程技术研究院,济南 250000
高功率、高重复频率纳秒脉冲激光广泛应用于激光切割、激光焊接等领域。随着激光重复频率的提升,特别是高于50 kHz时,单个周期有限的时间内难以积累足够的上能级粒子,调Q脉冲的稳定性成为了激光器设计的难点。当前主要采用主振荡器的功率放大器(MOPA)方案,直接振荡获得兼具高功率、高重复频率及高光束质量的纳秒脉冲激光还比较困难。通过对激光动力学过程的仿真模拟,定量分析了高重复频率调Q过程中脉冲强度稳定性与泵浦速率的关系,并利用负透镜使振荡器工作在具有较大基模体积的热近非稳区,实现了Nd:YAG声光调Q激光振荡器在高重复频率、高功率、高光束质量三方面的均衡设计。首次利用侧泵模块实现了100 kHz高功率高光束质量纳秒脉冲激光的直接振荡产生,脉冲强度的离散系数仅为0.041,激光输出功率超过142 W,脉冲宽度为165 ns,光束质量因子M2为1.5。
激光振荡器 高重复频率 声光调Q 纳秒 高光束质量 laser oscillator high repetition rate acousto-optic Q-switched nanosecond high beam quality 
强激光与粒子束
2023, 35(7): 071006
Author Affiliations
Abstract
1 School of Physics and Optoelectronics, State Key Laboratory of Luminescent Materials and Devices, Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices, Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, South China University of Technology, Guangzhou, China
2 Research Institute of Future Technology, South China Normal University, Guangzhou, China
In this work, we present a high-power, high-repetition-rate, all-fiber femtosecond laser system operating at 1.5 $\unicode{x3bc}$ m. This all-fiber laser system can deliver femtosecond pulses at a fundamental repetition rate of 10.6 GHz with an average output power of 106.4 W – the highest average power reported so far from an all-fiber femtosecond laser at 1.5 $\unicode{x3bc}$ m, to the best of our knowledge. By utilizing the soliton-effect-based pulse compression effect with optimized pre-chirping dispersion, the amplified pulses are compressed to 239 fs in an all-fiber configuration. Empowered by such a high-power ultrafast fiber laser system, we further explore the nonlinear interaction among transverse modes LP01, LP11 and LP21 that are expected to potentially exist in fiber laser systems using large-mode-area fibers. The intermodal modulational instability is theoretically investigated and subsequently identified in our experiments. Such a high-power all-fiber ultrafast laser without bulky free-space optics is anticipated to be a promising laser source for applications that specifically require compact and robust operation.
high-power femtosecond fiber laser high repetition rate intermodal modulational instability nonlinear pulse compression 
High Power Laser Science and Engineering
2023, 11(4): 04000e50
Author Affiliations
Abstract
1 Department of Electronic Engineering, Xiamen University, Xiamen 361005, China
2 Fujian Key Laboratory of Ultrafast Laser Technology and Applications, Xiamen University, Xiamen 361005, China
3 Shenzhen Research Institute, Xiamen University, Shenzhen 518000, China
We demonstrate an all-polarization-maintaining (PM) passively mode-locked Yb3+-doped fiber laser (YDFL) with a fundamental repetition rate of 1.3 GHz. The optical spectra of a linearly polarized soliton exhibit different shapes by rotating the fast axis of the fiber optical pigtail of a dispersive dielectric mirror. The oscillator provides a series of laser performance, such as a threshold pump power for continuous wave laser oscillation of 3.1 mW, an optical-to-optical efficiency for mode-locking of 29%, and an integrated relative intensity noise of 0.08%. To the best of our knowledge, this is the first report of >1 GHz ultrafast all-fiber YDFL with PM architecture.
highly doped fiber fiber laser high repetition rate 
Chinese Optics Letters
2023, 21(6): 061601
Author Affiliations
Abstract
1 School of Mathematics and Physics, Queen’s University Belfast, Belfast, UK
2 Central Laser Facility, STFC Rutherford Appleton Laboratory, Didcot, UK
3 Gérard Mourou Center for Ultrafast Optical Science, University of Michigan, Ann Arbor, MI, USA
4 SLAC National Accelerator Laboratory, Menlo Park, CA, USA
5 Department of Electrical and Computer Engineering, University of Alberta, Edmonton, AB, Canada
6 The John Adams Institute for Accelerator Science, Imperial College London, London, UK
7 ELI Beamlines Centre, Institute of Physics, Czech Academy of Sciences, Dolní Břežany, Czech Republic
8 Department of Applied Physics, Stanford University, Stanford, CA, USA
9 Department of Physics, SUPA, University of Strathclyde, Glasgow, UK
10 Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Prague, Czech Republic
11 Department of Mechanical Engineering, Stanford University, Stanford, CA, USA
12 Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany
The interaction of relativistically intense lasers with opaque targets represents a highly non-linear, multi-dimensional parameter space. This limits the utility of sequential 1D scanning of experimental parameters for the optimization of secondary radiation, although to-date this has been the accepted methodology due to low data acquisition rates. High repetition-rate (HRR) lasers augmented by machine learning present a valuable opportunity for efficient source optimization. Here, an automated, HRR-compatible system produced high-fidelity parameter scans, revealing the influence of laser intensity on target pre-heating and proton generation. A closed-loop Bayesian optimization of maximum proton energy, through control of the laser wavefront and target position, produced proton beams with equivalent maximum energy to manually optimized laser pulses but using only 60% of the laser energy. This demonstration of automated optimization of laser-driven proton beams is a crucial step towards deeper physical insight and the construction of future radiation sources.
Bayesian optimization high repetition-rate laser–target interaction laser-driven particle acceleration proton generation 
High Power Laser Science and Engineering
2023, 11(3): 03000e35
Author Affiliations
Abstract
1 John Adams Institute for Accelerator Science, Blackett Laboratory, Imperial College London, London, UK
2 School of Maths and Physics, Queen’s University Belfast, Belfast, UK
3 Central Laser Facility, STFC Rutherford Appleton Laboratory, Didcot, UK
4 SLAC National Accelerator Laboratory, Menlo Park, USA
5 ELI Beamlines Centre, Institute of Physics, CAS, Dolni Brezany, Czech Republic
6 Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Prague, Czech Republic
7 Department of Physics, SUPA, University of Strathclyde, Glasgow, UK
8 Department of Mechanical Engineering, Stanford University, Stanford, USA
9 Department of Applied Physics, Stanford University, Stanford, USA
10 Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Canada
11 Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany
We present the development and characterization of a high-stability, multi-material, multi-thickness tape-drive target for laser-driven acceleration at repetition rates of up to 100 Hz. The tape surface position was measured to be stable on the sub-micrometre scale, compatible with the high-numerical aperture focusing geometries required to achieve relativistic intensity interactions with the pulse energy available in current multi-Hz and near-future higher repetition-rate lasers ( $>$ kHz). Long-term drift was characterized at 100 Hz demonstrating suitability for operation over extended periods. The target was continuously operated at up to 5 Hz in a recent experiment for 70,000 shots without intervention by the experimental team, with the exception of tape replacement, producing the largest data-set of relativistically intense laser–solid foil measurements to date. This tape drive provides robust targetry for the generation and study of high-repetition-rate ion beams using next-generation high-power laser systems, also enabling wider applications of laser-driven proton sources.
high-repetition-rate laser target laser–plasma acceleration proton generation tape-drive target 
High Power Laser Science and Engineering
2023, 11(2): 02000e23
Author Affiliations
Abstract
1 Chinese Academy of Sciences, Shanghai Institute of Applied Physics, Shanghai, China
2 University of Chinese Academy of Sciences, Beijing, China
3 European XFEL, Schenefeld, Germany
4 Chinese Academy of Sciences, Shanghai Advanced Research Institute, Shanghai, China
The spectroscopic methods for the ultrafast electronic and structural dynamics of materials require fully coherent extreme ultraviolet and soft X-ray radiation with high-average brightness. Seeded free-electron lasers (FELs) are ideal sources for delivering fully coherent soft X-ray pulses. However, due to state-of-the-art laser system limitations, it is challenging to meet the ultraviolet seed laser’s requirements of sufficient energy modulation and high repetition rates simultaneously. The self-modulation scheme has been proposed and recently demonstrated in a seeded FEL to relax the seed laser requirements. Using numerical simulations, we show that the required seed laser intensity in the self-modulation is ~3 orders of magnitude lower than that in the standard high-gain harmonic generation (HGHG). The harmonic self-modulation can launch a single-stage HGHG FEL lasing at the 30th harmonic of the seed laser. Moreover, the proof-of-principle experimental results confirm that the harmonic self-modulation can still amplify the laser-induced energy modulation. These achievements reveal that the self-modulation can not only remarkably reduce the requirements of the seed laser but also improve the harmonic upconversion efficiency, which paves the way for realizing high-repetition-rate and fully coherent soft X-ray FELs.
high repetition rate free-electron laser self-modulation fully coherent soft X-ray 
Advanced Photonics Nexus
2023, 2(3): 036004
作者单位
摘要
1 国防科技大学, 合肥 230000
2 中国人民解放军31649部队, 广东 汕尾 516000
对抗激光半主动制导导弹, 高重频激光干扰是一种有效手段。为分析高重频激光对采取不同脉冲录取技术的导弹的干扰效能, 建立了高重频激光干扰效能模型。分别对导引头波门首次干扰成功的概率、第二次干扰成功的概率以及将目标指示信号诱偏出波门所需干扰次数进行了仿真模拟, 研究了高重频激光重复频率、波门宽度等因素对干扰效能的影响。仿真结果表明, 对采取首(末)脉冲录取技术的导弹, 干扰重复频率越高, 波门宽度越宽, 干扰成功的概率越高, 将目标指示信号诱偏出波门所需的次数越少。对采取最优时序脉冲录取技术的导弹, 首次干扰时, 干扰重复频率越高, 波门宽度越宽, 干扰成功的概率越高; 在首次干扰成功的条件下, 第二次干扰成功的概率随干扰激光重复频率的增长而趋于平缓; 并且将目标指示信号诱偏出波门所需的最佳干扰频率位于波门宽度倒数附近。研究成果可为装备研制及作战运用提供参考。
高重频 激光干扰 干扰效能 仿真 导弹 high repetition rate laser interference interference efficiency simulation missile 
电光与控制
2023, 30(2): 41

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