纳秒激光耦合金属靶辐射电磁脉冲的实验研究  

Measurement of electromagnetic pulses generation from ns-laser coupling with metaltargets

作　　者：杨燕飞[1] 李廷帅 YANG Yanfei;LI Tingshuai(Fundamental Division, Shandong Vocational College of Science & Technology, Weifang 261053, China;School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, China)

机构地区：[1]山东科技职业学院基础部,潍坊261053 [2]电子科技大学材料与能源学院,成都611731

出　　处：《激光技术》2020年第5期647-651,共5页Laser Technology

摘　　要：为了研究电磁脉冲(EMP)强度和分布与激光参量、靶体材料、结构等之间的关系,采用靶室内部的超小B-dot天线对强激光打靶过程中产生的电磁脉冲进行了测量,分析了不同辐射方位的脉冲强度,同时探讨了靶体支撑杆为绝缘体和导体两种情况下的电磁辐射行为。结果表明,不同方向和不同靶杆测得的电磁脉冲明显不同,如在法线方向的电磁辐射达到20V,导电靶杆最大达到22V的辐射,说明强激光打靶诱导的EMP具有很强的极化方向,并且在导体靶杆情况下,能够产生更强的电磁辐射。该研究有助于揭示激光打靶产生的EMP在靶室内部的传输极化特性以及其强度与靶杆导电性的关系。In order to study the relationships of the intensity and distribution of electromagnetic pulses(EMP)with laser parameters,target materials and configuration,the ultra-small B-dot antenna inside the target chamber was used to measure the electromagnetic pulses generated during the strong laser shooting metal copper targets.The pulse intensities in different radiation directions were analyzed.At the same time,electromagnetic radiation in the cases where the target support rod was an insulator and a conductor were discussed.The electromagnetic pulse shows a maximum value of 20V in the normal direction and 22V for the conductive rod,which indicates that EMP induced by strong laser targets has a strong polarized direction and can produce stronger electromagnetic radiation in the case of conductive target rods.The conclusion of this experiment is helpful for revealing the transmission polarization characteristics of EMP generated by laser target interaction in the target chamber and the relationship between its intensity and the conductivity of the target rod.

关 键 词：激光物理 电磁脉冲 固体靶 极化 

分 类 号：O431.1[机械工程—光学工程]