Breit-Wheeler process in very short electromagnetic pulses
Breit-Wheeler process in very short electromagnetic pulses
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DOI：
10.1103/physreva.87.042106
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发表时间：
2013-03
影响因子：
2.9
通讯作者：
A. Titov;B. Kampfer;B. Kampfer;H. Takabe;A. Hosaka
中科院分区：
文献类型：
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作者：
A. Titov;B. Kampfer;B. Kampfer;H. Takabe;A. Hosaka
分析了广义Breit-Wheeler过程，即探测光子对通过偏振的短脉冲电磁(如激光)波场的发射。我们证明了生产概率是由两种动力效应的相互作用决定的。第一个与脉冲的形状和持续时间有关，第二个与强电磁场相互作用的非线性动力学有关。第一种效应在弱场区域表现得最为明显，在弱场区域，弱场强度被有限时空区域内电磁场的快速变化所补偿，这加剧了少光子事件，与无限长脉冲相比，可以将产生几率提高一个数量级。因此，短脉冲可以被认为是一种强大的放大器。在大场强下，多光子Breit-Wheeler区的非线性动力学起着决定性的作用，而脉冲形状和持续时间的影响则不那么重要。在过渡制度中，必须同时考虑到这两种影响。我们给出了可用于运输编码的运动学区域的生产概率的适当表达式。
The generalized Breit-Wheeler process, i.e., the emission of ${e}^{+}{e}^{\ensuremath{-}}$ pairs off a probe photon propagating through a polarized short-pulsed electromagnetic (e.g., laser) wave field, is analyzed. We show that the production probability is determined by the interplay of two dynamical effects. The first one is related to the shape and duration of the pulse and the second one is the nonlinear dynamics of the interaction of ${e}^{\ifmmode\pm\else\textpm\fi{}}$ with the strong electromagnetic field. The first effect manifests itself most clearly in the weak-field regime, where the small field intensity is compensated by the rapid variation of the electromagnetic field in a limited space-time region, which intensifies the few-photon events and can enhance the production probability by orders of magnitude compared to an infinitely long pulse. Therefore, short pulses may be considered as a powerful amplifier. The nonlinear dynamics in the multiphoton Breit-Wheeler regime plays a decisive role at large field intensities, where effects of the pulse shape and duration are less important. In the transition regime, both effects must be taken into account simultaneously. We provide suitable expressions for the ${e}^{+}{e}^{\ensuremath{-}}$ production probability for kinematic regions which can be used in transport codes.