多色非相干光入射ICF黑腔受激布里渊散射分析  

Analysis of stimulated Brillouin scattering in ICF hohlraum excited by multi-color incoherent lights

作　　者：王强[1] 刘占军[1] 郑春阳[1] 李欣[1] 曹莉华[1] 郝亮[1] 蔡洪波[1] Wang Qiang;Liu Zhanjun;Zheng Chunyang;Li Xin;Cao Lihua;Hao Liang;Cai Hongbo(Institue of Applied Physics and Computational Mathematics,P.O.Box 8009,Beijing 100094,China)

机构地区：[1]北京应用物理与计算数学研究所,北京100094

出　　处：《强激光与粒子束》2021年第10期22-31,共10页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(11975059,11875091)。

摘　　要：为研究多色非相干激光入射ICF黑腔的受激布里渊散射(SBS)和受激拉曼散射(SRS)发展情况,建立了一维受激散射稳态谱分析模型,并发展了相应的数值模拟程序。分析了不同频率激光激发的受激散射光通过共用等离子体波耦合的物理图像以及影响背散光谱的物理因素。针对波长差0.3 nm的等强度双色光入射封底金腔的SBS进行了模拟分析,结果表明:采用双色光有效抑制了SBS;SBS光谱劈裂成间距为0.3 nm的两个峰;波长较长的入射光对应的SBS光获得了较大的增益;如果固定激光总强度和总带宽,则存在抑制SBS的最优光束数目。To study the stimulated Brillouin scattering(SBS)and stimulated Raman scattering in inertial confinement fusion(ICF)hohlraum excited by multi-color incoherent light,in this paper a one-dimensional steadystate model is introduced and implemented by a numerical program.The physical pictures in which the stimulated scattering excited by individual lightrays can be coupled through sharing electrostatic wave and the physical factors affecting the spectrum of backward scattered light are analyzed.The simulation of SBS in a golden cylinderical hohlraum excited by two-color light with wavelength separation 0.3 nm by the two-color light,the spectrum of SBS splits into two peaks with separation of 0.3 nm,the SBS light corresponding to incident light of longer wavelength gets higher gain,and if the total intensity and bandwidth of lasers are both fixed,there exists a best number of beamlets to suppress SBS.

关 键 词：激光惯性约束聚变 多色非相干光 受激布里渊散射 背向散射光谱分析 

分 类 号：O53[理学—等离子体物理]