A simple and effective method for identifying the real sources of pre-pulses in CPA and OPCPA laser systems  

作　　者：Haidong Chen Xun Chen Xingyan Liu Jiabing Hu Peile Bai Jiayan Gui Xiaojun Yang Kegui Xia Fenxiang Wu Zongxin Zhang Yanqi Liu Xinliang Wang Yi Xu Yuxin Leng 

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,Chinese Academy of Sciences,Shanghai,China [2]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing,China

出　　处：《High Power Laser Science and Engineering》2024年第5期76-82,共7页高功率激光科学与工程(英文版)

基　　金：supported by the National Key Research and Development Program of China (Nos. 2022YFE0204800, 2022YFA1604401 and 2019YFF01014401);the Shanghai Sailing Program (No. 21YF1453800), the National Natural Science Foundation of China (Nos. 11127901 and 61925507);the International Partnership Program of the Chinese Academy of Sciences (No. 181231KYSB20200040);the Shanghai Science and Technology Committee Program (Nos. 22560780100 and 23560750200);the Chinese Academy of Sciences President’s International Fellowship Initiative (No. 2023VMB0008);the Youth Innovation Promotion Association of the Chinese Academy of Sciences。

摘　　要：The delay-shift of the pre-pulse may mislead the determination of its origination and cause problems for the temporal contrast improvement of high-peak-power lasers, especially when the corresponding post-pulse is beyond the time window of the measurement device. In this work, an empirical formula is proposed to predict the delay-shift of pre-pulses for the first time. The empirical formula shows that the delay-shift is proportional to the square of the post-pulse’s initial delay, and also the ratio of the third-order dispersion to the group delay dispersion’s square, which intuitively reveals the main cause for the delay-shift and may provide a convenient routing for identifying the real sources of pre-pulses in both chirped-pulse amplification (CPA) and optical parametric chirped-pulse amplification (OPCPA) systems. The empirical formula agrees well with the experimental results both in the CPA and the OPCPA systems. Besides, a numerical simulation is also carried out to further verify the empirical formula.

关 键 词：chirped-pulse amplification optical parametric chirped-pulse amplification pre-pulse 

分 类 号：F23[经济管理—会计学]