Backscatter light diagnosis with hohlraum on SG-Ⅲ prototype laser facility
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摘要: 在惯性约束聚变研究中，为研究激光等离子体互作用产生的受激布里渊与受激拉曼散射光(SRS)，基于神光Ⅲ原型装置利用新的背向散射诊断系统对真空黑腔靶与充气黑腔靶以及有无束匀滑效果情况下的散射光光谱进行了测量。实验发现，在相同条件下，充气黑腔靶SRS散射光比真空黑腔靶大，在终端光学组件中使用束匀滑效果后也能降低散射光。诊断系统记录的散射光强度及光谱的时间变化过程对研究激光等离子体相互作用提供了重要的数据支撑。Abstract: To study the stimulated Brillouin scattering (SBS) and stimulated Raman scattering(SRS) light produced during the inertial confinement fusion (ICF) studies on SG-Ⅲ prototype laser facility, the spectra of scattered light from vacuum hohlraum and gas filled hohlraum are measured using a new backscatter light diagnostic system. Experimental results show that the gas filled hohlraums produce more SRS light than the vacuum hohlraums under the same experimental parameters. Meanwhile, the scattered light will be reduced with the application of smoothing into optical module. The temporal evolution of the intensity and spectra of the scattered light can be recorded by this new backscatter light diagnostic system, which is valuable for the studies of ICF.
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