A novel small-scale self-focusing suppression method for post-compression in high peak power lasers  

作　　者：Shuren Pan Fenxiang Wu Yang Zhao Jiabing Hu Zongxin Zhang Yi Xu Yuxin Leng Ruxin Li Efim Khazanov 

机构地区：[1]State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultra-intense Laser Science,Shanghai Institute of Optics and Fine Mechanics(SIOM),Chinese Academy of Sciences,Shanghai,China [2]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing,China [3]Gaponov-Grekhov Institute of Applied Physics(IAP)of Russian Academy of Sciences,Moscow,Russia [4]China-Russian Belt and Road Joint Laboratory on Laser Science,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai,China

出　　处：《High Power Laser Science and Engineering》2024年第4期97-104,共8页高功率激光科学与工程（英文版）

基　　金：supported by the National Key R&D Program of China(2022YFE0204800,2022YFA1604401,2019YFF01014401);Shanghai Sailing Program(21YF1453800);National Natural Science Foundation of China(11127901,61925507);International Partnership Program of Chinese Academy of Sciences(181231KYSB20200040);Shanghai Science and Technology Committee Program(22560780100,23560750200);Chinese Academy of Sciences President’s International Fellowship Initiative(2023VMB0008);Ministry of Science and Higher Education of the Russian Federation(075-15-2020-906,Center of Excellence‘Center of Photonics’);Youth Innovation Promotion Association of the Chinese Academy of Sciences。

摘　　要：A novel method,combining an asymmetric four-grating compressor(AFGC)with pulse post-compression,is numerically demonstrated to improve the spatial uniformity of laser beams and hence to suppress small-scale self-focusing(SSSF)during the beam propagation in nonlinear materials of high peak power lasers.The spatial uniformity of laser beams is an important factor in performing post-compression,due to the spatial intensity modulation,or hot spots will be aggravated during the nonlinear propagation and then seriously damage the subsequent optical components.Three-dimensional numerical simulations of post-compression are implemented based on a femtosecond laser with a standard compressor and an AFGC,respectively.The simulated results indicate that post-compression with the AFGC can efficiently suppress the SSSF and also shorten the laser pulses from 30 fs to sub-10 fs.This work can provide a promising route to overcome the challenge of SSSF and will be meaningful to promote the practical application of the post-compression technique in high peak power lasers.

关 键 词：high peak power laser post-compression asymmetric four-grating compressor small-scale self-focusing 

分 类 号：TN248[电子电信—物理电子学]