神光Ⅱ长脉冲三倍频激光受激Raman散射能量角分布测量  

The stimulated Raman scattering from interaction of 351nm laser light with hohlraum

作　　者：王传珂[1] 况龙钰[1] 王哲斌[1] 刘慎业[1] 李文洪[1] 李三伟[1] 蒋小华[1] 

机构地区：[1]中国工程物理研究院激光聚变研究中心高温高密度等离子体物理国家重点实验室,绵阳621900

出　　处：《核聚变与等离子体物理》2006年第4期310-313,共4页Nuclear Fusion and Plasma Physics

基　　金：国家863计划项目资助课题(863-804-3)

摘　　要：介绍了在神光Ⅱ装置上开展的长脉冲2ns三倍频激光与黑腔靶相互作用的实验。报道了采用PIN探测器阵列测量大角度受激Raman散射(SRS)角分布和采用激光卡计对背向SRS光能量积分测量的实验结果。相同实验条件下激光辐照缝靶产生的SRS光能量要强于激光与全腔靶作用产生的SRS光,小腔靶的SRS光能量要强于标准腔靶。对比长脉冲2ns及短脉冲1ns激光打靶实验结果可以看出:由于激光功率密度的下降,长脉冲激光打靶时SRS散射光能量要弱于短脉冲激光打靶。长脉冲2ns激光与标准腔靶相互作用时,等离子体堵腔比较严重。An experimental study of laser-plasma interaction in hohlraum by laser with 351nm wavelength and 2ns pulse at SGII facility is reported in this paper. The angular distribution of stimulated Raman scattering （SRS） energy has been measured. In the same conditions of laser pulse width and hohlraum dimension, the SRS energy from slot hohlraum is higher than that from hohlraum, and the energy from small hohlraum is higher than that from standard hohlraum. The SRS energy from interaction of 2ns laser with hohlraum is weaker than that of Ins laser with hohlraum due to decrease of laser power density. The experiments show that the size of standard hohlraum is unsuitable for 2ns laser-produced plasma.

关 键 词：激光等离子体 受激Raman散射 PIN探测器 腔靶 

分 类 号：O437.3[机械工程—光学工程]