论文标题
超短激光脉冲中的隧穿电离：边缘效应和疗法
Tunneling ionization in ultrashort laser pulses: edge-effect and remedy
论文作者
论文摘要
考虑到超短激光脉冲中原子的隧穿电离。当驱动激光脉冲在陡峭的斜率上切换并 - OFF时，光电子动量分布（PMD）显示出边缘效应，因为脉冲的时间段的光电子衍射。边缘效应的微不足道衍射模式由PMD中的快速振荡组成，在深度非绝热状态下伪装起来的频谱中物理上更有趣的特征来自光电子动力学。我们指出了如何在实验中避免这种情况的精确条件，并且如果理论上不可避免，我们提出了一种有效的方法来消除PMD中的边缘效应。这允许强调PMD的非绝热动力学特征，这对于在复杂的计算要求方案中进行进一步研究是必不可少的。该方法首先在一维问题上证明，并在三维中进一步应用该方法。通过强场近似与时间依赖性schrödinger方程的数值解的分析结果比较来验证该方法。
Tunneling ionization of an atom in ultrashort laser pulses is considered. When the driving laser pulse is switched-on and -off with a steep slope, the photoelectron momentum distribution (PMD) shows an edge-effect because of the photoelectron diffraction by the time-slit of the pulse. The trivial diffraction pattern of the edge effect consisting of fast oscillations in the PMD disguises in the deep nonadiabatic regime the physically more interesting features in the spectrum which originate from the photoelectron dynamics. We point out the precise conditions how to avoid this scenario experimentally and if unavoidable in theory we put forward an efficient method to remove the edge-effect in the PMD. This allows to highlight the nonadiabatic dynamical features of the PMD, which is indispensable for their further investigation in complex computationally demanding scenarios. The method is firstly demonstrated on a one-dimensional problem, and further applied in three-dimensions for the attoclock. The method is validated by a comparison of analytical results via the strong-field approximation with numerical solutions of the time-dependent Schrödinger equation.
