从局域到非局域：强laser脉冲中光子发射的高保真度模拟
From local to nonlocal: higher fidelity simulations of photon emission in intense laser pulses
摘要：
强激光场中的量子电动力学（QED）过程的最新数值模拟依赖于经典运动方程和QED速率的半经典组合，其在局部恒定场近似下计算。然而，如果场的振幅$a_0$可与1相比，则后一种近似是不可靠的。此外，根据定义，它不能捕获引起谐波结构的干涉效应。在这里，我们提出了一种替代的数值方法，它解决了这两个问题相结合的周期平均运动方程和QED率计算的局部单色近似。我们证明，它显着提高了平面波、啁啾和聚焦背景场中整个光子能量和激光强度范围内光子发射模拟的准确性。
英文摘要：
State-of-the-art numerical simulations of quantum electrodynamical (QED) processes in strong laser fields rely on a semiclassical combination of classical equations of motion and QED rates, which are calculated in the locally constant field approximation. However, the latter approximation is unreliable if the amplitude of the fields, $a_0$, is comparable to unity. Furthermore, it cannot, by definition, capture interference effects that give rise to harmonic structure. Here we present an alternative numerical approach, which resolves these two issues by combining cycle-averaged equations of motion and QED rates calculated in the locally monochromatic approximation. We demonstrate that it significantly improves the accuracy of simulations of photon emission across the full range of photon energies and laser intensities, in plane-wave, chirped and focused background fields.
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