Electron-positron pair production in frequency modulated laser fields
Electron-positron pair production in frequency modulated laser fields
复制标题
DOI：
10.1103/physrevd.101.016008
复制
发表时间：
2019-08
影响因子：
5
通讯作者：
C. Gong;Z. Li;B. Xie;Y. J. Li
中科院分区：
文献类型：
--
作者：
C. Gong;Z. Li;B. Xie;Y. J. Li
利用量子动力学方程研究了调频激光场中产生的电子-正电子对的动量谱和数密度。发现动量谱呈现明显的干涉图样。这是频率调制场在动量谱上的印记，因为动量峰对应于通过吸收不同频率分量光子的对产生过程。此外，通过对转折点结构的分析，也可以定性地理解干涉效应。对数密度的研究表明，数密度对调制参数非常敏感，在一定的调制参数下，数密度可以提高两个数量级以上，这为今后实验中增加产生的正负电子对提供了一种新的途径.
The momentum spectrum and the number density of created electron-positron pairs in a frequency modulated laser field are investigated using quantum kinetic equation. It is found that the momentum spectrum presents obvious interference pattern. This is an imprint of the frequency modulated field on the momentum spectrum, because the momentum peaks correspond to the pair production process by absorbing different frequency component photons. Moreover, the interference effect can also be understood qualitatively by analyzing turning point structures. The study of the pair number density shows that the number density is very sensitive to modulation parameters and can be enhanced by over two orders of magnitude for certain modulation parameters, which may provide a new way to increase the number of created electron-positron pairs in future experiments.