Cherenkov radiation of a fast electron in ultrashort intense laser plasmas
Cherenkov radiation of a fast electron in ultrashort intense laser plasmas
复制标题
DOI：
10.1063/1.2815793
复制
发表时间：
2007-12
影响因子：
2.2
通讯作者：
Q. Hu;Shibing Liu;W. Li
中科院分区：
文献类型：
--
作者：
Q. Hu;Shibing Liu;W. Li
基于密度微扰理论，从理论上探讨了超短强激光等离子体中快电子产生的切伦科夫辐射。详细讨论了切伦科夫几何的辐射发射条件和特性。通过数值计算发现，在特定的参数条件下，超短脉冲强激光产生的快电子与等离子体介质的耦合可以激发切伦科夫型太赫兹辐射。结果表明，辐射强度强烈依赖于入射激光的脉冲宽度和快电子的速度，发射谱宽度依赖于等离子体密度和快电子与激光群速度之比，发射角分布依赖于激光的有效半径。
The Cherenkov radiation resulting from a fast electron in ultrashort intense laser plasma is explored theoretically based on the density perturbation theory. The radiation emitting conditions and characteristics of the corresponding Cherenkov geometry are discussed in detail. By numerical computation, a significant conclusion is revealed that the THz radiation of Cherenkov-type can be excited by the coupling of a fast electron produced by an intense ultrashort pulse laser and plasma medium in specifically parameter conditions. The results show that the radiation intensity is strongly dependent on the pulse duration of incident laser and the velocity of a fast electron, the emission spectrum width is dependent on the plasma density and the ratio of a fast electron and laser group velocities, and the emission angle distribution is dependent on the effective radius of laser beam.