超强激光-等离子体相互作用过程中的辐射阻尼效应

Radiation damping effects in ultra-intense laser-plasma interaction

基于包含辐射阻尼效应的电子运动方程,通过坐标变换,分析了圆极化和线极化超强激光在等离子体中传播时,辐射阻尼效应对电子运动的影响。结果表明:两种极化情况下,辐射阻尼效应都随等离子体密度的增大而增强;在圆极化激光中,激光强度在1023～1026 W/cm2范围(对应于不同的等离子体密度)时,辐射阻尼效应将对电子的运动产生显著的反作用,而对于线极化激光,只有当激光强度远大于极限光强时,辐射阻尼效应才对电子的运动有明显的作用。

Using the reference frame transformation, radiation damping effects in ultra-intense laser-plasma interaction are analyzed based on the motion equation of a radiation electron. The results show that, in both cases of the circularly and the linearly polarized lasers, the radiation damping effects are enhanced with the plasma density increasing. In the circularly polarization case, if the laser intensity is at the order of 1023-1026 W/cm2, corresponding to different plasma densities, the radiation damping effects may influence the motion of electron significantly, while in the linearly polarization case, only when the laser intensity is much higher than the critical intensity, the radiation damping effects can obviously affect the motion of electron.