近相对论强度激光与薄膜靶相互作用中靶厚度对超热电子发射方向的影响

研究了近相对论强度的激光脉冲与薄膜靶相互作用中，靶厚度对超热电子发射方向的影响.实验发现，随着靶厚度的增加，靶后超热电子的发射方向向靶的法线方向移动，同时电子束的发散角变大.结果分析表明，靶背面电荷分离场强度的变化是影响电子发射方向的主要原因. 关键词： 飞秒激光脉冲 超热电子 靶厚度

Effects of target thickness on emission direction of hot electrons generated from subrelativistic intensity laser pulses interacting with foil targets

The effects of target thickness on emission directions of hot electrons are investigated in the interaction of subrelativistic intensity laser pulses with foil targets. The results show that the emission direction of the hot electrons at the rear side of the target shifts towards the target normal direction as the target thickness increases. It can be seen that the electrostatic field at the rear side of the target surface is the main cause affecting the emission direction of the hot electrons.