1 中国科学院上海光学精密机械研究所, 上海 201800
2 中国科学院大学, 北京 100049
高能拍瓦激光的高精度脉宽测量对离轴抛物面镜焦斑功率密度的诊断以及光栅损伤阈值的分析都具有重要意义。分析了光束指向性和近场分布的周期性调制这两方面的误差影响。结果表明, 当反射镜稳定性在5 μrad时,光束指向性的误差最大为0.03%。当近场调制周期增加时, 误差降低; 而调制度增加时, 误差增大。另外, 采用镜像结构能降低近场缺陷导致的测量误差。当调制深度为1.5、调制周期大于10时, 综合误差小于20%, 最小可降至10%。镜像结构的误差均小于15%, 最小可降至0。在拍瓦级激光脉宽测量实验中, 证实了近场调制对于脉宽测量的影响及改善效果。
激光器 超短脉冲 单次自相关 高能激光 超短脉冲测量 中国激光
2017, 44(11): 1104001
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 Laser Plasma, China Academy of Engineering Physics, Shanghai, China
2 School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing, China
3 National Laboratory for High Power Laser Physics, Shanghai, China
4 Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, China
5 Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, China
The capability of chirped-pulse compression and beam focusing of an object-image-grating self-tiling grating compressor is demonstrated in an optical parametric chirped-pulse amplification laser for the first time. Probe lasers for tiling error adjustments, which are generally required by the traditional tiled-grating compressor, are not needed in our demonstration any more. With the aid of the double-sized effective optical aperture of the second grating in the compressor, a 490 fs near-transform-limit pulse duration and a 90 μm near-diffraction-limit focal spot are obtained, synchronously, which are very close to the ones achieved by a non-tiled grating compressor with equal-sized individual gratings.
chirped pulse amplification grating compressor tiled grating Collection Of theses on high power laser and plasma physics
2014, 12(1): 1362
Author Affiliations
Abstract
1 Shanghai Institute of Laser and Plasma, China Academy of Engineering Physics, 197 Chengzhong Road, Jiading, Shanghai 201800, China
2 School of Electronic and Optical Engineering, Nanjing University of Science and Technology, 200 Xiaolingwei Street, Nanjing, Jiangsu 210094, China
3 Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, 390 Qinhe Road, Jiading, Shanghai 201800, China
Object image grating self-tiling reduces difficulties of obtaining an ideal grating tiling condition by eliminating three tiling errors in six within a tiled grating. However, this may bring two potential problems: higher requirements of adjustment accuracy and maintaining stability. To examine the application values of this grating tiling configuration, the performance of object image grating self-tiling and traditional grating tiling configurations on accuracy and stability are compared theoretically and experimentally. Adjustment accuracy requirements of two grating tiling configurations are calculated, a comparative experiment of long-term stabilities is demonstrated, and relevant theoretical simulation analyses are developed to explain the experiment results.
Collection Of theses on high power laser and plasma physics
2013, 11(1): 0718
