神光Ⅲ原型受激拉曼与受激布里渊散射份额测量
Energy fraction measurements of stimulated Brillouin scattering and stimulated Raman scattering on Shenguang-Ⅲ prototype laser facility
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摘要: 激光注入率测量是黑腔耦合效率测量至关重要的一个环节，主要通过散射光测量来实现。在神光Ⅲ原型激光装置上进行的黑腔物理实验中，利用PIN探头阵列进行了散射光角分布测量。通过拟合分析，发现原型装置上激光等离子体非线性相互作用较神光Ⅱ装置要强，其中受激拉曼份额在10%量级，受激布里渊散射在20%量级。将由此评估的激光靶耦合效率代入辐射温度定标率公式中，得出的辐射温度值与实验中Dante测量值符合较好，说明对参量过程份额的评估具有一定可靠性。Abstract: The measurement of the fraction of laser-entrance energy, which is carried out mainly through the measurement of scattering light, is very important in the measurement of coupling efficiency of the hohlraum. The angular distribution of scattering light is measured on the Shenguang-Ⅲ prototype laser facility using the PIN detector array. It is demonstrated that the nonlinear laser plasma interaction, in which the stimulated Raman scattering fraction is about 10% and the stimulated Brillouin scattering about 20%, is stronger than that on Shenguang-Ⅱ laser facility. The laser target coupling efficiency thus evaluated is taken into the formula which describes the radiation temperature scaling law. The calculated radiation temperature agrees well with the experimental Dante results, which ind
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