Numerical study of spatial chirp distortion in quasi-parametric chirped-pulse amplification  

作　　者：Yirui Wang Jing Wang Jingui Ma Peng Yuan Liejia Qian 

机构地区：[1]School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai 200240,China [2]Tsung-Dao Lee Institute,Shanghai Jiao Tong University,Shanghai 200240,China

出　　处：《High Power Laser Science and Engineering》2022年第3期19-24,共6页高功率激光科学与工程（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(Nos.61727820,61905142,61975120,and 91850203).

摘　　要：Optical parametric chirped-pulse amplification is inevitably subject to high-order spatial chirp,particularly under the condition of saturated amplification and a Gaussian pump;this corresponds to an irreversible spatiotemporal distortion and consequently degrades the maximum attainable focused intensity.In this paper,we reveal that such spatial chirp distortion can be significantly mitigated in quasi-parametric chirped-pulse amplification(QPCPA)with idler absorption.Simulation results show that the quality of focused intensity in saturated QPCPA is nearly ideal,with a spatiotemporal Strehl ratio higher than 0.98.As the seed bandwidth increases,the idler absorption spectrum may not be uniform,but the Strehl ratio in QPCPA can be still high enough due to stronger idler absorption.

关 键 词：gain saturation quasi-parametric chirped-pulse amplification spatiotemporal distortions 

分 类 号：TN78[电子电信—电路与系统]