Momentum distribution of particles created in space-time-dependent colliding laser pulses
Momentum distribution of particles created in space-time-dependent colliding laser pulses
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DOI：
10.1103/physrevd.96.076006
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发表时间：
2017-09
影响因子：
5
通讯作者：
I. Aleksandrov;G. Plunien;V. Shabaev
中科院分区：
文献类型：
--
作者：
I. Aleksandrov;G. Plunien;V. Shabaev
研究了两束反向传播的线偏振短脉冲激光作用下的电子对产生过程。通过一个非微扰技术，我们考虑到充分的坐标依赖的外部场超越偶极子和驻波近似。特别是，我们分析了粒子的动量分布。结果表明，激光脉冲的空间变化可能起着至关重要的作用。更精确的处理揭示了一些突出的特点：对生产的概率变得相当小，动量谱的定量行为发生了显着变化，脉冲形状的影响变得不那么明显。我们的研究结果是非常重要的，为未来的理论和实验研究。
We study the pair-production process in the presence of two counterpropagating linearly polarized short laser pulses. By means of a nonperturbative technique, we take into account the full coordinate dependence of the external field going beyond the dipole and standing-wave approximations. In particular, we analyze the momentum distribution of particles created. It is demonstrated that the spatial variations of the laser pulses may play a crucial role. The more accurate treatment reveals a number of prominent features: the pair-production probabilities become considerably smaller, the quantitative behavior of the momentum spectra changes dramatically, and the pulse shape effects become much less pronounced. The results of our study are expected to be very important for future theoretical and experimental investigations.