351nm激光入射大腔靶的受激Raman散射光谱  

Stimulated Raman scattering from holraum irradiated with 351nm laser light

作　　者：王哲斌[1] 郑坚[1] 蒋小华[2] 刘慎业[2] 李文洪[2] 刘万东[1] 俞昌旋[1] 刘永刚[2] 张海鹰[2] 谭晓青[2] 彭晓世[2] 丁永坤[2] 郑志坚[2] 

机构地区：[1]中国科学技术大学近代物理系,安徽合肥230027 [2]中国工程物理研究院激光聚变研究中心,四川绵阳621900

出　　处：《强激光与粒子束》2004年第1期45-49,共5页High Power Laser and Particle Beams

基　　金：国家863计划项目资助课题;国家自然科学基金资助课题(10176028)

摘　　要：　报道了"神光 Ⅱ"装置上Au大柱腔靶产生的受激Raman散射光谱。通过分析实验条件和测量结果,排除了散射光谱来自增强非相干Thomson散射的可能性,发现用丝化不稳定性与受激Raman散射的耦合能合理解释观测到的Raman光谱。考虑到丝化不稳定性与SRS的耦合,测量到的散射光谱依然能用于密度诊断,其结果与对流SRS理论的计算值相差不到10%。Time-resolved and time-integrated stimulated Raman scattering (SRS) spectra from gold hohlraum irradiated with 351nm laser light are measured. The experimental results are inconsistent with the prediction of the convective SRS theory and enhanced incoherent Thomson scattering model. The analyses show that the prediction of SRS in filaments agrees reasonably with the experimental results. Based on the model of the coupling between filaments and SRS, the method of diagnosing plasma density with SRS spectrum was developed. The calculated result shows that the difference between the model and the convective SRS theory is less than 10%, which agrees with the conclusion made by Afshar-rad.

关 键 词：受激Raman散射 丝化不稳定性 朗道阻尼 增强非相干Thomson散射 

分 类 号：O534.2[理学—等离子体物理] O436.2[理学—物理]