快电子发散角的实验测量

采用飞秒激光辐照铜靶,利用电子角分布仪和LiF热释光探测器测量了快电子发射的发散角.实验结果显示,快电子的发散角与激光入射角密切相关,随着激光入射角增加,快电子的发散角逐渐减小.在相同入射角条件下,加上预脉冲将导致快电子的发散角变小.这个结果为获取较小发散角的快电子束提供了实验参考.

Experimental measure the divergence angle of fast electrons from a Cu target irradiated by intense femtosecond laser pulses

The divergence angle of fast electrons produced in the interaction of femtosecond laser with Cu target has been measured by suing an angular distribution instrument adding the LiF thermoluminescent dosimeters. The results show that the divergence angle of fast electrons is highly relational with the incidence angle of laser pulses. The divergence angle of fast electrons gets small when increased the incidence angle of laser pulses. By adding a prepulse to generate preplasma, the divergence angle of fast electrons is lesser than that without a prepulse. The result is helpful for gain a fast electron beam with small divergence angle.