Rastunkov V S, Krainov V P
Moscow Institute of Physics and Technology, 141700 Dolgoprudny, Moscow Region, Russia.
Phys Rev E Stat Nonlin Soft Matter Phys. 2004 Mar;69(3 Pt 2):037402. doi: 10.1103/PhysRevE.69.037402. Epub 2004 Mar 22.
The general peculiarities of electron motion in the skin layer at the irradiation of overdense plasma by a superintense linearly polarized laser pulse of femtosecond duration are considered. The quiver electron energy is assumed to be a relativistic quantity. Relativistic electron drift along the propagation of laser radiation produced by a magnetic part of a laser field remains after the end of the laser pulse, unlike the relativistic drift of a free electron in underdense plasma. As a result, the penetration depth is much larger than the classical skin depth. The conclusion has been made that the drift velocity is a nonrelativistic quantity even at the peak laser intensity of 10(21) W/cm(2). The time at which an electron penetrates into field-free matter from the skin layer is much less than the pulse duration.
考虑了持续时间为飞秒的超强线偏振激光脉冲辐照过密等离子体时，表皮层中电子运动的一般特性。假定颤动电子能量为相对论性量。与欠密等离子体中自由电子的相对论漂移不同，激光脉冲结束后，由激光场的磁场部分产生的沿激光辐射传播方向的相对论电子漂移依然存在。结果，穿透深度远大于经典趋肤深度。得出的结论是，即使在激光峰值强度为10(21)W/cm(2)时，漂移速度也是非相对论性量。电子从表皮层穿透到无场物质中的时间远小于脉冲持续时间。
