在“星光Ⅱ”钕玻璃激光装置上,开展了脉宽约0.8ns、能量~70J的351nm激光在不同条件下辐照Au盘靶的实验,研究了激光光束质量对受激布里渊散射(SBS)谱的影响。SBS散射光谱测量结果表明,在激光束未匀滑条件下,SBS散射谱范围为352~360nm;在采用透镜列阵将激光束匀滑聚焦的条件下,激光等离子体密度变得更加均匀,SBS散射光谱范围变为351~351.5nm。实验数据为透镜列阵对光束的匀滑效果提供了直接支持。 In the “Star Ⅱ” neodymium glass laser device, carried out a pulse width of about 0.8ns, energy ~ 70J 351nm laser irradiation under different conditions of the Au plate target experiments to study the laser beam quality stimulated Brillouin Scattering (SBS) spectra. The results of SBS scattering spectra show that the scattering spectrum of SBS ranged from 352 nm to 360 nm under the condition of non-uniform laser beam. The laser plasma density became more uniform under the condition that the laser beam was focused homogeneously by lens array. The SBS Scattering spectral range becomes 351 ~ 351.5nm. The experimental data provide direct support for the smoothing effect of the light beam by the lens array.