Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.
Phys Rev Lett. 2013 Feb 15;110(7):070402. doi: 10.1103/PhysRevLett.110.070402. Epub 2013 Feb 11.
A detailed analysis of the process of two-photon emission by an electron scattered from a high-intensity laser pulse is presented. The calculations are performed in the framework of strong-field QED and include exactly the presence of the laser field described as a plane wave. We investigate the full nonlinear quantum regime of interaction with a few-cycle pulse, where nonlinear effects in the laser field amplitude, photon recoil, and the short pulse duration substantially alter the emitted photon spectra as compared to those in previously studied regimes. We provide a semiclassical explanation for such differences, based on the possibility of assigning a trajectory to the electron in the laser field before and after each quantum photon emission. Our numerical results indicate the feasibility of investigating experimentally the full ultrarelativistic quantum regime of nonlinear double Compton scattering with available electron accelerator and laser technology.
我们提出了一种详细分析电子在高强度激光脉冲散射后双光子发射过程的方法。该计算是在强场 QED 的框架内进行的，并且精确地包含了激光场的存在，激光场被描述为平面波。我们研究了与几个周期脉冲相互作用的完整非线性量子 regime，与以前研究的 regime 相比，激光场幅度、光子反冲和短脉冲持续时间中的非线性效应极大地改变了发射的光子谱。我们基于在每次量子光子发射前后为电子在激光场中分配轨迹的可能性，对此类差异提供了半经典解释。我们的数值结果表明，利用现有的电子加速器和激光技术，实验研究完整的非线性双 Compton 散射的全相对论量子 regime 是可行的。
