Lehmann G, Spatschek K H
Institut für Theoretische Physik, Heinrich-Heine-Universität Düsseldorf, D-40225 Düsseldorf, Germany.
Phys Rev E Stat Nonlin Soft Matter Phys. 2011 Oct;84(4 Pt 2):046409. doi: 10.1103/PhysRevE.84.046409. Epub 2011 Oct 24.
A well-known no-energy-gain theorem states that an electron cannot gain energy when being overrun by a plane (transverse) laser pulse of finite length. The theorem is based on symmetries which are broken when radiation reaction (RR) is included. It is shown here that an electron, e.g., being initially at rest, will gain a positive velocity component in the laser propagation direction after being overrun by an intense laser pulse (of finite duration and with intensity of order 5×10(22) W/cm(2) or larger). The velocity increment is due to RR effects. The latter are incorporated in the Landau-Lifshitz form. Both linear as well as circular polarization of the laser pulse are considered. It is demonstrated that the velocity gain is proportional to the pulse length and the square of the peak amplitude of the laser pulse. The results of numerical simulations are supported by analytical estimates.
一个著名的无能量增益定理表明，当电子被有限长度的平面（横向）激光脉冲追赶时，它无法获得能量。该定理基于一些对称性，而当考虑辐射反作用（RR）时这些对称性会被打破。本文表明，例如一个初始静止的电子，在被一个强激光脉冲（有限持续时间且强度为5×10(22) W/cm(2) 或更大）追赶后，会在激光传播方向上获得一个正的速度分量。速度增量归因于辐射反作用效应。后者以朗道 - 栗弗席兹形式纳入。同时考虑了激光脉冲的线偏振和圆偏振。结果表明，速度增益与脉冲长度以及激光脉冲峰值振幅的平方成正比。数值模拟结果得到了解析估计的支持。
