From local to nonlocal: higher fidelity simulations of photon emission in intense laser pulses
From local to nonlocal: higher fidelity simulations of photon emission in intense laser pulses
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DOI：
10.1088/1367-2630/ac1bf6
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发表时间：
2021-03
影响因子：
3.3
通讯作者：
TG Blackburn;A. Macleod;B. King
中科院分区：
文献类型：
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作者：
TG Blackburn;A. Macleod;B. King
强激光场中量子电动力学 (QED) 过程的最先进数值模拟依赖于经典运动方程和 QED 速率的半经典组合，这些方程是在局部恒定场近似中计算的。然而，如果场的幅度（a 0）与单位相当，则后一种近似是不可靠的。此外，根据定义，它无法捕获引起谐波结构的干扰效应。在这里，我们提出了一种替代的数值方法，它通过结合循环平均运动方程和局部单色近似中计算的 QED 速率来解决这两个问题。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的光子发射模拟的准确性。
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.