快电子发散角的实验测量  

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

作　　者：蔡达锋[1] 谷渝秋[2] 郑志坚[2] 王剑[1] CAI Da-Feng;Gu Yu-Qiu;ZHENG Zhi-Jian;WANG Jian(School of Engineering and Technology,Nei Jiang Teachers College,Nei Jiang 641112,China;Research Center of Laser Fusion,CAEP,Mianyang 621900,China)

机构地区：[1]内江师范学院工程技术学院,内江641112 [2]中国工程物理研究院激光聚变研究中心,绵阳621900

出　　处：《原子与分子物理学报》2018年第2期272-276,共5页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(10975121);四川省教育厅科研项目(10ZA012)

摘　　要：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.The divergence angle of fast electrons produced in the interaction of femtosecond laser with Cu target has been measured by using an angular distribution instrument adding the LiF thermoluminescent dosimeters.The results show that the divergence angle of fast electrons is highly related with the incidence angle of laser pulses.The divergence angle of fast electrons gets small when increasing 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 getting a fast electron beam with small divergence angle.

关 键 词：飞秒激光 铜靶 快电子 发散角 测量 

分 类 号：O434.12[机械工程—光学工程]