用3TW超短超强激光器进行了激光与固体靶相互作用实验.采用电子角分布仪和LiF热释光探测器探测了超热电子的角分布.测量结果显示:能量较高的电子发射的定向性好于能量较低的电子;能量较低的电子呈溅射状发射;能量较高的电子发射出现两个尖锐的发射峰,其中,激光反射方向的超热电子发射峰则由反射激光、有质动力径向分量、侧向拉曼散射等加速机制共同作用的结果,靠近靶法线方向的超热电子发射峰是由其振吸收机制产生,且理论预言与实验结果相吻合.

This paper reports the experimental results of the angular distribution of hot electrons during the interaction of ultrashort ultra-intense laser with solid targets. It shows that the divergence angle of hot electrons with the high energy was smaller than that of hot electrons with the low energy. There are two peaks in the angular distribution of hot electrons with the high energy: one peak in specular direction is due to several absorption or acceleration mechanism, whereas the other peak close to the normal of the target is expected by the resonance absorption and is well consistent with H. Ruhl et al's theory(1999).