Author Affiliations
Abstract
1 Shanghai Institute of Laser Plasma, China Academy of Engineering Physics, Shanghai 201899, China
2 State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
3 School of Physics and Astronomy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
The use of low-coherence light is expected to be one of the effective ways to suppress or even eliminate the laser–plasma instabilities that arise in attempts to achieve inertial confinement fusion. In this paper, a review of low-coherence high-power laser drivers and related key techniques is first presented. Work at typical low-coherence laser facilities, including Gekko XII, PHEBUS, Pharos III, and Kanal-2 is described. The many key techniques that are used in the research and development of low-coherence laser drivers are described and analyzed, including low-coherence source generation, amplification, harmonic conversion, and beam smoothing of low-coherence light. Then, recent progress achieved by our group in research on a broadband low-coherence laser driver is presented. During the development of our low-coherence high-power laser facility, we have proposed and implemented many key techniques for working with low-coherence light, including source generation, efficient amplification and propagation, harmonic conversion, beam smoothing, and precise beam control. Based on a series of technological breakthroughs, a kilojoule low-coherence laser driver named Kunwu with a coherence time of only 300 fs has been built, and the first round of physical experiments has been completed. This high-power laser facility provides not only a demonstration and verification platform for key techniques and system integration of a low-coherence laser driver, but also a new type of experimental platform for research into, for example, high-energy-density physics and, in particular, laser–plasma interactions.
Matter and Radiation at Extremes
2020, 5(6): 065201
强激光与粒子束
2020, 32(1): 011004
吴金明 1,2,4赵元安 2,4,5,*汪琳 1,**彭小聪 2,3,4[ ... ]邵建达 2,4,***
1 上海大学材料科学与工程学院, 上海 200444
2 中国科学院上海光学精密机械研究所薄膜光学实验室, 上海 201800
3 中国科学院大学材料与光电研究中心, 北京 100049
4 中国科学院强激光材料重点实验室, 上海 201800
5 中国科学院长春光学精密机械与物理研究所应用光学国家重点实验室, 吉林 长春 130033
6 中国工程物理研究院上海激光等离子体研究所, 上海 201800
为了研究DKDP晶体在惯性约束核聚变(ICF)装置应用中的多波长激光诱导损伤特性,建立了1064 nm激光和355 nm激光同时辐照DKDP晶体的损伤测试装置,分析了不同激光能量密度组合下的损伤针点形貌、密度、尺寸和损伤概率。结果表明,当355 nm激光以R-on-1方式辐照样品,并加入不同能量密度的1064 nm激光时,随着1064 nm激光能量密度的升高,测试样品的抗激光损伤性能得到改善,损伤针点形貌逐渐与1064 nm激光单独作用时的损伤形貌类似,损伤针点密度减小,损伤针点尺寸增大,整体上表现出耦合预处理效应。
激光光学 晶体 预处理效应 多波长激光 损伤缺陷
Author Affiliations
Abstract
1 Shanghai Institute of Laser Plasma, China Academy of Engineering Physics, Shanghai 201800, China
2 Key Laboratory of Materials for High Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
3 State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
4 IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, China
The spatial resolved method, which measures the laser-induced damage fluence by identifying the location of the damage point in the Gaussian beam three-dimensional direction, is demonstrated. The advantages and practicality of this method have been explained. Taking a triple frequency beam splitter as an example, the defect damage fluence can be accurately calculated by the spatial resolved method. The different defect damage performance of the triple frequency splitter is distinguished under irradiations of only the 355 and 532 nm lasers. The spatial resolved method provides a way to obtain precise information of optical film defect information.
140.3330 Laser damage 140.3295 Laser beam characterization Chinese Optics Letters
2019, 17(3): 031403
1 长春理工大学理学院, 吉林 长春 130022
2 中国科学院上海光学精密机械研究所强激光材料重点实验室, 上海 201800
3 中国科学院大学, 北京 100049
提出一种基于高斯脉冲激光空间分辨测量光学元件表面激光损伤阈值的方法。通过设定激光能量密度差对高斯光斑进行能量密度分区, 统计并分析每个能量密度分区的能量密度以及损伤密度分布, 设定一个零损伤密度所对应的激光能量密度作为所测样品的激光损伤阈值。同时利用国际标准1-on-1激光损伤阈值测试方法对同一样品进行激光损伤阈值测试, 并将两种测试方法获得的损伤阈值进行了比较分析, 证明基于高斯脉冲激光空间分辨的激光损伤阈值测试方法, 解决了国际标准1-on-1激光损伤阈值测试中将高斯光斑内空间能量密度以及损伤点的不均匀分布等效地视作均匀分布所带来的问题。
测量 激光损伤阈值 空间分辨