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Improvements in long-term output energy performance of Nd:glass regenerative amplifiers

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High Power Laser Science and Engineering 2017年第4期5卷 1-7页

作者： Peng Zhang youen jiang jiangfeng Wang Wei Fan Xuechun Li Jianqiang Zhu National Laboratory on High Power Laser and Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China

Optical damages, which severely degrade the output energy performance of Nd:glass regenerative amplifiers, are discussed in detail in this paper. By a series of experiments, it has been confirmed that these damages result from laser-induced contamination. Based on this work, several improvements are made to boost output energy performance of the regenerative amplifier. The output energy of the regenerative amplifier after improvements declines 4% after 1000 h of operation, much less than it used to, 60% after 560 h of operation.

关键词： diode-pumped solid-state laser and application high-power laser high-power laser related laser components laser amplifiers laser induced damage preamplifiers

高稳定高光光效率的Yb∶YAG单薄片再生放大器

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中国激光 2024年第2期51卷 39-44页

作者：石玉森李祖强潘雪肖奇汤晓云卢兴华王江峰张攀政姜有恩范薇李学春朱健强中国科学院上海光学精密机械研究所高功率激光物理联合实验室上海201800 中国科学院大学材料与光电研究中心北京100049

薄片激光器可以实现高峰值功率、高平均功率、高光束质量的激光输出,是高重复频率皮秒泵浦源的关键技术之一。基于Yb∶YAG单薄片激光模块设计并搭建了再生放大系统,连续泵浦下获得了平均功率为40.9 W、重复频率为1 kHz、脉冲宽度为3.4 n... 详细信息

薄片激光器可以实现高峰值功率、高平均功率、高光束质量的激光输出,是高重复频率皮秒泵浦源的关键技术之一。基于Yb∶YAG单薄片激光模块设计并搭建了再生放大系统,连续泵浦下获得了平均功率为40.9 W、重复频率为1 kHz、脉冲宽度为3.4 ns的激光输出,水平方向上的光束质量因子(M_(x)^(2))和竖直方向上的光束质量因子(M_(y)^(2))分别为1.12和1.10。基于腔内光束指向主动控制技术,2 h输出的平均功率稳定性峰谷(PV)值和均方根(RMS)值分别为6.42%和0.56%。在600μs脉冲泵浦情形下,光光效率达16.1%。在10 kHz重复频率下,获得了53.3 W的高平均功率的激光输出,M_(x)^(2)和M_(y)^(2)分别为1.07和1.06。

关键词：激光器薄片激光器再生放大器脉冲泵浦激光稳定性

Directly writing binary multi-sector phase plates on fused silica using femtosecond laser

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High Power Laser Science and Engineering 2018年第1期6卷 33-37页

作者： Li Zhou youen jiang Peng Zhang Wei Fan Xuechun Li Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences

Light carrying orbital angular momentum(OAM) has a spatial distribution of intensity and phase, which attracts considerable interest regarding several potential applications in optical and quantum scenarios recently. Spiral phase plates are commonly used elements for generating and analyzing OAM states. In this study, we put forward a method of directly writing binary multi-sector phase plates using the femtosecond laser. These phase plates are engraved on fused silica, which could be applied in high-intensity regimes. Different binary multi-sector phase plates were generated with high quality, which were proved by the observation of their structures, accompanied by detecting the beam patterns with the Gaussian beams. The proposed method provides a crucial basis for the rapid manufacturing of phase plates using convenient equipment, which can generate the superposition OAM states and may lead to the capability of measuring the high-dimensional entanglement.

关键词： femtosecond laser and applications optical fabrication phase plate orbital angular momentum modes

Suppression of amplitude modulation induced by polarization mode dispersion using a multi-degree-of-freedom fiber filter

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High Power Laser Science and Engineering 2018年第4期6卷 5-15页

作者： Rao Li youen jiang Zhi Qiao Canhong Huang Wei Fan Xuechun Li Zunqi Lin National Laboratory on High Power Laser and Physics Shanghai 201800China Key Laboratory of High Power Laser and Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China

Polarization mode dispersion(PMD) in fibers for high-power lasers can induce significant frequency modulation to amplitude modulation(FM-to-AM) conversion. However, existing techniques are not sufficiently flexible to achieve efficient compensation for such FM-to-AM conversion. By analyzing the nonuniform transmission spectrum caused by PMD, we found that the large-scale envelope of the transmission spectrum has more serious impacts on the amount of AM. In order to suppress the PMD-induced FM-to-AM conversion, we propose a novel tunable spectral filter with multiple degrees of freedom based on a half-wave plate, a nematic liquid crystal, and an axis-rotated polarizationmaintaining fiber. Peak wavelength, free spectral range(FSR), and modulation depth of the filter are decoupled and can be controlled independently, which is verified through both simulations and experiments. The filter is utilized to compensate for the PMD-induced FM-to-AM conversion in the front end of a high-power laser facility. The results indicate that, for a pulse with phase-modulation frequency of 22.82 GHz, the FM-to-AM conversion could be reduced from 18% to 3.2% within a short time and maintained below 6.5% for 3 h. The proposed filter is also promising for other applications that require flexible spectral control such as high-speed channel selection in optical communication networks.

关键词： advanced laser technology and applications design fiber laser and applications high-power laser laser facility laser facility and engineering laser systems modeling optimization

高能皮秒拍瓦激光研究进展、技术挑战及发展趋势

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中国激光 2024年第11期51卷 92-119页

作者：姜有恩杨朋千潘雪张艳丽郭亚晶朱坪李大为崔勇欧阳小平陶华姜卓偲樊全堂华能唐顺兴肖奇张栋俊刘东宁黄鹏飞李祖强朱宝强马伟新朱俭李学春朱健强中国科学院上海光学精密机械研究所高功率激光物理联合实验室上海201800 中国工程物理研究院上海激光等离子体研究所上海201800 中国科学院大学材料与光电研究中心北京100049

兼具高峰值功率和高脉冲能量两大特征的皮秒拍瓦激光与物质相互作用的物理效果跟脉冲信噪比、聚焦功率密度和时空调控精度等关键因素直接相关。深入研究了这三大因素相应的受限机制、关键技术以及神光II升级装置中皮秒拍瓦激光等典型代... 详细信息

兼具高峰值功率和高脉冲能量两大特征的皮秒拍瓦激光与物质相互作用的物理效果跟脉冲信噪比、聚焦功率密度和时空调控精度等关键因素直接相关。深入研究了这三大因素相应的受限机制、关键技术以及神光II升级装置中皮秒拍瓦激光等典型代表的最新技术进展,对于提升拍瓦激光性能具有指导作用。针对皮秒拍瓦激光的负载受限问题,从元器件损伤阈值、光场退化和洁净控制等方面进行了分析,并综述了基于等离子体光学的脉冲放大及压缩技术在突破高功率激光负载瓶颈的新研究动向。此外,皮秒拍瓦激光要从实验室走向更广泛的应用,还需要持续推进高效高能重复频率皮秒拍瓦激光的技术攻关。

关键词：激光技术拍瓦激光信噪比聚焦功率密度时空调控精度皮秒负载

Multilayer dielectric grating pillar-removal damage induced by a picosecond laser

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High Power Laser Science and Engineering 2022年第6期10卷 66-74页

作者： Kun Shuai Xiaofeng Liu Yuanan Zhao Keqiang Qiu Dawei Li He Gong Jian Sun Li Zhou youen jiang Yaping Dai Jianda Shao Zhilin Xia School of Materials Science and Engineering Wuhan University of TechnologyWuhanChina Laboratory of Thin Film Optics Shanghai Institute of Optics and Fine MechanicsShanghaiChina National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefeiChina School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghaiChina National Laboratory on High Power Laser and Physics Shanghai Institute of Optics and Fine MechanicsCASShanghaiChina Research Center of Laser Fusion China Academy of Engineering PhysicsMianyangChina Hangzhou Institute for Advanced Study University of Chinese Academy of SciencesHangzhouChina

Multilayer dielectric gratings typically remove multiple-grating pillars after picosecond laser irradiation;however,the dynamic formation process of the removal is still *** this study,the damage morphologies of multilayer dielectric gratings induced by an 8.6-ps laser pulse were closely *** damage included the removal of a single grating pillar and consecutive adjacent grating pillars and did not involve the destruction of the internal high-reflection mirror *** analysis of the two damage morphological characteristics indicated the removal of adjacent pillars was related to an impact process caused by the eruption of localized materials from the left-hand pillar,exerting impact pressure on its adjacent pillars and eventually resulting in multiple pillar removal.A finite-element strain model was used to calculate the stress distribution of the grating after *** to the electric field distribution,the eruptive pressure of the dielectric materials after ionization was also *** results suggest that the eruptive pressure resulted in a stress concentration at the root of the adjacent pillar that was sufficient to cause damage,corresponding to the experimental removal of the adjacent pillar from the *** study provides further understanding of the laser-induced damage behavior of grating pillars and some insights into reducing the undesirable damage process for practical applications.

关键词： grating pillar removal laser-induced damage multilayer dielectric gratings picosecond laser

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石英光学元件激光损伤修复形貌的优化

中国激光 2016年第6期43卷 110-118页

作者：周丽姜有恩韦辉范薇李学春中国科学院上海光学精密机械研究所高功率激光物理联合实验室上海201800 中国科学院大学北京100049

针对三倍频光学元件后表面的损伤修复形貌,分别采用时域有限差分法(FDTD)和瑞利-索末菲(R-S)衍射积分法,来模拟不同形貌下元件修复区域内以及其后续的光场分布。结果表明,当修复坑截面轮廓线端点切线与光束传播方向夹角大于70°时,元件... 详细信息

针对三倍频光学元件后表面的损伤修复形貌,分别采用时域有限差分法(FDTD)和瑞利-索末菲(R-S)衍射积分法,来模拟不同形貌下元件修复区域内以及其后续的光场分布。结果表明,当修复坑截面轮廓线端点切线与光束传播方向夹角大于70°时,元件内部光强极大值小于1.66,修复效果优于其他角度。夹角为70°、宽200μm的抛物面型、圆锥型和圆台型凹坑的后续光强极大值小于1.46。但是当修复坑宽度较大如达到1mm时,圆台型凹坑的后续光强极大值高达9.31,且作用区间长。因此,考虑实际激光修复工艺的难度,夹角大于70°的圆锥型凹坑是石英元件后表面损伤修复的首选形貌。

关键词：激光技术激光损伤修复时域有限差分法瑞利索末菲衍射积分

Nanosecond laser conditioning of multilayer dielectric gratings for picosecond–petawatt laser systems

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High Power Laser Science and Engineering 2023年第6期11卷 239-248页

作者： Kun Shuai Yuanan Zhao Xiaofeng Liu Xiangkun Lin Zhilin Xia Keqiang Qiu Dawei Li He Gong Yan Zhou Jian Sun Li Zhou youen jiang Yaping Dai Jianda Shao Laboratory of Thin Film Optics Shanghai Institute of Optics and Fine MechanicsChinese Academy of Sciences(CAS)ShanghaiChina Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijingChina Key Laboratory of Materials for High Power Laser Chinese Academy of SciencesShanghaiChina School of Materials Science and Engineering Wuhan University of TechnologyWuhanChina National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefeiChina School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghaiChina National Laboratory on High Power Laser and Physics Shanghai Institute of Optics and Fine MechanicsCASShanghaiChina Research Center of Laser Fusion China Academy of Engineering PhysicsMianyangChina Hangzhou Institute for Advanced Study University of Chinese Academy of SciencesHangzhouChina

Multilayer dielectric gratings(MLDGs)are crucial for pulse compression in picosecond-petawatt laser *** nodular defects,embedded in coating stacks during multilayer deposition,influence the lithographic process and performance of the final MLDG *** this study,the integration of nanosecond laser conditioning(NLC)into different manufacturing stages of MLDGs was proposed for the first time on multilayer dielectric films(MLDFs)and final grating products to improve laser-induced damage *** results suggest that the remaining nodular ejection pits introduced by the two protocols exhibit a high nanosecond laser damage resistance,which remains stable when the irradiated laser fluence is more than twice the nanosecond-laser-induced damage threshold(nanosecond-LIDT)of the unconditioned ***,the picosecond-LIDT of the nodular ej ection pit conditioned on the MLDFs was approximately 40%higher than that of the nodular defects,and the loss of the grating structure surrounding the nodular defects was ***,NLC is an effective strategy for improving the laser damage resistance of MLDGs.

关键词： laser-induced damage threshold multilayer dielectric gratings nanosecond laser conditioning nodular defects picosecond-petawatt laser systems

Progress of the injection laser system of SG-Ⅱ

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High Power Laser Science and Engineering 2018年第2期6卷 154-180页

作者： Wei Fan youen jiang jiangfeng Wang Xiaochao Wang Dajie Huang Xinghua Lu Hui Wei Guoyang Li Xue Pan Zhi Qiao Chao Wang He Cheng Peng Zhang Wenfa Huang Zhuli Xiao Shengjia Zhang Xuechun Li Jianqiang Zhu Zunqi Lin National Laboratory on High Power Laser and Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China

A high power laser system was used to drive the ignition of inertial confinement fusion(ICF), of which the high energy,the uniform focal spot, the accurate laser waveform, and the synchronization between the laser beams are key *** accomplish this, global laser characteristics control should be assured, which was the main purpose of the injection laser system. In this paper, the key technological progress involved in the improvement of the performance of the injection laser of SG-II is reported, including frequency domain control, time domain control, near-field spatial shaping, preamplifier technology, and the optical parametric chirped pulse amplification pump source.

关键词： amplifier injection laser pulse shaping spatial shaping synchronization