激光带宽对等离子体中受激拉曼散射不稳定性的抑制效应  

Suppression effects of laser bandwidth on stimulated Raman scattering instability in underdense plasma

作　　者：赵耀[1] 郑君[1] 於陆勒[1] 陈民[1] 翁苏明[1] 盛政明[1] 

机构地区：[1]上海交通大学物理与天文系,激光等离子体教育部重点实验室,上海200240

出　　处：《中国科学：物理学、力学、天文学》2015年第3期59-68,共10页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：国家自然科学基金资助项目(批准号:11129503;11374210)

摘　　要：本文研究了激光带宽对等离子体中受激拉曼散射不稳定性激发的抑制效应.通过改变激光参数和等离子体参数,利用一维粒子模拟验证了当激光带宽远大于线性增长率时,带宽对受激拉曼散射的线性增长阶段具有明显的抑制作用.模拟研究同时表明通过选择适当的调频参数和降低受激拉曼散射的线性增长率可以使带宽的抑制效应更明显.但是激光带宽并没有使受激拉曼散射完全消失,其抑制作用主要体现在延长不稳定性线性增长的时间.The suppression effects of laser bandwidth on stimulated Raman scattering（SRS） instability in underdense plasma are studied by one-dimensional particle-in-cell（1D PIC） simulations. By changing laser and plasma parameters, it is shown that the linear growth of SRS can be suppressed considerably, provided the laser bandwidth is much larger than SRS linear growth rate. Simulations also show that by choosing the proper frequency modulation parameters or decreasing the linear growth rate of SRS, the inhibitory effects become more obvious. However, the laser bandwidth can only increase the timeduration for linear growth but cannot diminish the instability completely.

关 键 词：受激拉曼散射 激光带宽 惯性约束核聚变 参量不稳定 

分 类 号：O53[理学—等离子体物理]