摘要
为了验证束匀滑的物理效果并获得充气黑腔的辐射源特性，在神光Ⅲ原型装置上利用背向散射测量系统对束匀滑和充气条件下的散射光能量份额及光谱进行了测量。散射光能量测量结果表明：当前实验条件下，束匀滑可有效抑制背向散射光份额，散射光份额由无束匀滑时的25％～35％降为2％～4％，充气黑腔中受激拉曼散射光份额明显增加，由真空腔的2％～4％增大至10％～13％。光谱测量结果表明：束匀滑后等离子体状态更均匀，充气黑腔的受激拉曼散射在激光作用前期就开始显著产生，而在真空黑腔中主要产生于激光作用的后期。
In order to validate the effect of beam smoothing and to get the radiation characteristics of gas-filled hohlraum, the energy fraction of backscattering light and the streaked spectrum are measured by the backscattering measurement system on Shenguang-Ⅲ prototype facility. The results indicate that in the current experimental conditions, beam smoothing can effectively inhibit the backscattering light fraction. The energy fraction of backscattering light is 25%- 35% without beam smoothing, and the energy fraction decreases to 2% ~ 4% with beam smoothing. The fraction of stimulated Raman scattering in gas-filled hohlraum increases markedly from 2 % 4% in empty hohlraum to 10% ~ 13%. The results of spectrum measurement indicate that beam smoothing can improve the uniformity of plasma. Stimulated Raman scattering occurs at the early stage of the laser effect for gas- filled hohlraum, but it occurs at the late stage for empty hohlraum.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2014年第3期171-176,共6页
Acta Optica Sinica
基金
激光聚变研究中心创新基金(CX08201202)
关键词
测量
束匀滑
背向散射
受激拉曼散射
等离子体
measurement
beam smoothing
backscattering
stimulated Raman scattering
plasma
