强激光与粒子束
2023, 35(5): 052001
1 中国计量大学光学与电子科技学院,浙江 杭州 310018
2 中国工程物理研究院上海激光等离子体研究所,上海 201800
定量分析光纤阵列位移及指向扰动偏差对合束激光光束质量因子M2的影响规律是实现合束激光光束质量有效控制的前提。根据衍射积分推导了紧凑型光谱组束系统中光纤阵列存在不同位移、指向扰动时合束激光的远场光强分布,利用Heisenberg不确定性原理推导出了合束激光光束质量因子M2的表达式。在恒定的子束数目下,分析了单路/多路光束分别存在位移、指向扰动偏差时合束激光光束质量因子M2的变化情况,并在一定的随机位移、指向扰动偏差下对不同子束数量的合束激光的光束质量因子M2进行了误差分析。结果显示:合束激光光束质量因子M2对沿光纤端面水平(x轴)方向的扰动量最为敏感,需要控制在微米量级;确定了光纤阵列的不同扰动量与合束激光光束质量因子M2之间的定量关系,给出了光纤阵列位移、指向精度控制要求;当参与合束的子束数量超过23束时,在特定的随机扰动量下,合束激光的光束质量因子M2的统计均值分别趋向各自的稳定值1.37、1.34、1.25,而标准差分别趋于0.05、0.06、0.04。
光纤光学 光纤阵列 光束质量 光谱组束 紧凑型组束系统
强激光与粒子束
2021, 33(7): 071005
红外与激光工程
2020, 49(12): 20201074
强激光与粒子束
2020, 32(11): 112009
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
Author Affiliations
Abstract
1 The Shanghai Institute of Laser Plasma, Shanghai 201800, China
2 The IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, China
3 The Shanghai Institute of Optics and Fine Mechanics, Shanghai 201800, China
4 The Laser Fusion Research Center, Mianyang 621900, China
An attosecond precision and femtosecond range timing jitter measurement and control technique is proposed. It is based on the modulation of the combined pulse induced by relative time delay of individual pulses. The core of this timing jitter detection method is the integrated technique of optical cross correlation and electrical energy interferometry. To illustrate this technique, a proof-of-principle experiment is demonstrated based on two 237 fs pulses. The peak-to-valley timing jitter of the two pulses to be combined is less than 700 as in 1 h and the average efficiency of coherent beam combining could reach to 91.6%.
Coherent beam combining electrical energy interferometry optical cross correlation timing jitter Collection Of theses on high power laser and plasma physics
2016, 14(1): 2215
Author Affiliations
Abstract
1 Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 Graduate School, China Academy of Engineering Physics, Mianyang 621900, China
3 School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
4 Shanghai Institute of Laser and Plasma, China Academy of Engineering Physics, Shanghai 201800, China
5 Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
A method is proposed for third-order dispersion compensation in compressors of femtosecond petawatt laser facilities employing object-image-grating self-tiling technology to prevent the return of the laser beam in amplifying chains. Simulations are performed for functioning and being developed Nd:glass and Ti:sapphire petawatt-level lasers.
chirped-pulse amplification femtosecond pulse compressor with an object-image- third-order dispersion Collection Of theses on high power laser and plasma physics
2015, 13(1):