短脉冲laser中的亚阈电子对产生
Subthreshold pair production in short laser pulses
摘要：
将探测光子穿过线偏振激光脉冲产生$e^+e^-$对的过程视为广义非线性Breit-Wheeler过程。对于电磁场振荡非常少的短激光脉冲，我们发现在微扰弱场阈值$\sqrt{s} = 2m$以下，对产生率的增强与圆偏振类似。强的亚阈值增强可追溯到激光脉冲的有限带宽。提出了一种折叠模型，它考虑了脉冲过程中频谱和强度分布的相互作用。
英文摘要：
The $e^+e^-$ pair production by a probe photon traversing a linearly polarized laser pulse is treated as generalized nonlinear Breit-Wheeler process. For short laser pulses with very few oscillations of the electromagnetic field we find below the perturbative weak-field threshold $\sqrt{s} = 2m$ a similar enhancement of the pair production rate as for circular polarization. The strong subthreshold enhancement is traced back to the finite bandwidth of the laser pulse. A folding model is developed which accounts for the interplay of the frequency spectrum and the intensity distribution in the course of the pulse.
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