相对论强短脉冲laser电离的超连续谱：无干扰电离及其时间分析
Supercontinuum in ionization by relativistically intense and short laser pulses: ionization without interference and its time analysis
摘要：
在强场量子电动力学的框架下，研究了相对论强激光脉冲作用下的电离。我们的主要重点是电离超连续谱的形成。更具体地说，当研究由圆偏振脉冲电离的光电子的能量分布时，我们观察到缺乏干涉图案的宽结构的出现。这些超连续谱延伸超过数百个驱动光子能量，因此对应于高阶非线性过程。相应的极角分布示出归因于光电子所经历的辐射压力的不对称性。此外，我们的时间分析表明，组成超连续谱的电子可以形成短持续时间的脉冲。虽然我们提出了充分的数值结果，他们的解释是基于鞍点近似的电离概率振幅。
英文摘要：
Ionization by relativistically intense laser pulses of finite duration is considered in the framework of strong-field quantum electrodynamics. Our main focus is on the formation of ionization supercontinua. More specifically, when studying the energy distributions of photoelectrons ionized by circularly polarized pulses, we observe the appearance of broad structures lacking the interference patterns. These supercontinua extend over hundreds of driving photon energies, thus corresponding to high-order nonlinear processes. The corresponding polar-angle distributions show asymmetries which are attributed to the radiation pressure experienced by photoelectrons. Moreover, our time analysis shows that the electrons comprising the supercontinuum can form pulses of short duration. While we present the fully numerical results, their interpretation is based on the saddle-point approximation for the ionization probability amplitude.
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