Spectral characteristics of laser-plasma instabilities with a broadband laser

作     者：许国潇 康宁 雷安乐 刘会亚 赵耀 周申蕾 安红海 熊俊 王瑞荣 谢志勇 周熙晨 方智恒 王伟 Guo-Xiao Xu;Ning Kang;An-Le Lei;Hui-Ya Liu;Yao Zhao;Shen-Lei Zhou;Hong-Hai An;Jun Xiong;Rui-Rong Wang;Zhi-Yong Xie;Xi-Chen Zhou;Zhi-Heng Fang;Wei Wang

作者机构：Key Laboratory of High Power Laser and PhysicsShanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Shanghai Institute of Laser PlasmaChina Academy of Engineering PhysicsShanghai 201800China School of ScienceShenzhen Campus of Sun Yat-sen UniversityShenzhen 518107China University of Chinese Academy of SciencesBeijing 100049China 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2024年第33卷第8期

页      面：362-368页

核心收录：

学科分类：080901[工学-物理电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 08[工学] 080401[工学-精密仪器及机械] 0804[工学-仪器科学与技术] 070204[理学-等离子体物理] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：Project supported by the National Natural Science Foundation of China (Grant No.11905280) 

主　　题：laser-plasma instability laser bandwidth light spectrum 

摘      要：Recent experimental progresses regarding broadband laser-plasma instabilities(LPIs)show that a 0.6%laser bandwidth can reduce backscatters of the stimulated Brillouin scattering(SBS)and the stimulated Raman scattering(SRS)at normal incidence[***.132035102(2024)].In this paper,we present a further discussion of the spectral distributions of the scatters developed by broadband LPIs,in addition to a brief validation of the effectiveness of bandwidth on LPIs mitigation at oblique *** backscatter has a small redshift in the broadband case contrary to the blueshift with narrowband laser,which may be explained by the self-cross beam energy transfer between the various frequency components within the *** backscatter spectrum presents a peak at a longer wavelength in the broadband case compared to the short one in the narrowband case,which is possibly attributed to the mitigation effect of bandwidth on filaments at underdense *** three-halves harmonic emission(3ω/2)has a one-peak spectral distribution under the broadband condition,which is different from the two-peak distribution under the narrowband condition,and may be related to the spectral mixing of different frequency components within the bandwidth if the main sources of the two are both two-plasmon decays.