Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.
School of Science, Xi'an Jiaotong University, Xi'an 710049, China.
Phys Rev Lett. 2018 Mar 23;120(12):124803. doi: 10.1103/PhysRevLett.120.124803.
The impact of the carrier-envelope phase (CEP) of an intense multicycle laser pulse on the radiation of an electron beam during nonlinear Compton scattering is investigated. We have identified a CEP effect specific to the ultrarelativistic regime. When the electron beam counterpropagates with the laser pulse, pronounced high-energy x-ray double peaks emerge near the backward direction relative to the initial electron motion. This is achieved in the relativistic interaction domain, where both the electron energy is required to be lower than for the electron reflection condition at the laser peak and the stochasticity effects in the photon emission need to be weak. The asymmetry parameter of the double peaks in the angular radiation distribution is shown to serve as a sensitive measure for the CEP of up to 10-cycle long laser pulses and can be applied for the characterization of extremely strong laser pulses in present and near future laser facilities.
研究了强多周期激光脉冲的载波包络相位（CEP）对非线性康普顿散射中电子束辐射的影响。我们已经确定了一种在超高相对论区特有的 CEP 效应。当电子束与激光脉冲反向传播时，在初始电子运动的反向附近会出现明显的高能 X 射线双峰。这是在相对论相互作用域中实现的，其中电子能量需要低于激光峰值处电子反射条件所需的能量，并且光子发射中的随机性效应需要较弱。双峰在角分布中的不对称参数被证明是一种对长达 10 个周期的激光脉冲的 CEP 的敏感测量方法，并且可以应用于目前和未来的激光设施中对极强激光脉冲的特性进行表征。
