关键词: 
激光等离子体 /
激光散射 /
背向散射 /
圆盘靶

摘要: 在星光Ⅱ激光装置上，测量了脉宽1ns、能量40-110J的527nm激光在不同条件下辐照Au盘靶、Al盘靶的背向散射能量。结果表明：激光辐照Au盘靶时．在聚焦条件下背向散射能量约占打靶激光能量的7．8％；在束匀滑条件下背向散射能量份额下降到6.2％左右，证明了束匀滑可有效抑制背向散射。对比Au盘靶、Al盘靶背反能量与打靶激光能量关系曲线，可以看出背向散射能量与打靶激光能量基本上成线性关系。 Au and Al disk target were irradiated with -1 ns, 40-110 J, 527 nm laser at Xingguang-Ⅱ facility. The backscattered lights by laser-produced plasma were studied experimentally. The results are in troduced in this paper. Backscattered light energy is 7.8% of laser energy when laser is focused on Au disk target; when laser beam is smoothed, it is 6.2%. The comparison shows that laser smoothing can restrain backscattered light efficiency. The experimental results ：also show that there is a linear relation between backscattered light energy and the laser energy.