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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。
Laser injection rate measurement is a crucial part of black cavity coupling efficiency measurement, mainly through the measurement of scattered light to achieve. In black cavity physics experiment carried out by SGL prototype laser device, the angular distribution of scattering light was measured by PIN probe array. Through the fitting analysis, it is found that the non-linear interaction of the laser plasma on the prototype device is stronger than that of the SG II, in which the stimulated Raman fraction is on the order of 10% and the stimulated Brillouin scattering is on the order of 20%. The laser target coupling efficiency thus evaluated was substituted into the calibration formula of radiation temperature, and the obtained radiation temperature value was in good agreement with the experimental Dante measurement value, indicating that the assessment of the share of the process parameters has certain reliability.