初始相位对周期量级激光脉冲Thomson散射特性的影响

Initial-phase dependence of Thomson scattering spectrum for few-cycle laser pulse

用电子Thomson散射的经典理论,研究了周期量级激光脉冲作用下电子Thomson散射的特性,讨论了不同激光强度下,激光脉冲的初始相位对电子辐射的空间分布以及特定方向上频谱分布特性的影响。计算表明:对弱激光脉冲,电子辐射的空间分布类似于偶极天线的对称双叶结构,初始相位对电子的辐射几乎没有影响;而对强激光脉冲,电子辐射的空间分布出现了三叶结构,初始相位对电子的辐射影响非常显著。

The scattering of few-cycle laser pulse by single electron has been investigated through the classical theory of Thomson scattering using free electrons. The temporal and spatial characteristics of the radiation are presented for different laser intensity and initial phase. For low power-intensity laser pulses, the radiation pattern is the same as that from a dipole antenna. However the radiation pattern is three leafs for the high laser intensity. The influence of the initial phase on the temporal and spartial characteristics of the radiation is stronger for the high intense laser pulse than for the low intense case.