Two-color phase-of-the-phase spectroscopy with circularly polarized laser pulses
Two-color phase-of-the-phase spectroscopy with circularly polarized laser pulses
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DOI：
10.1103/physreva.98.053433
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发表时间：
2018-08
影响因子：
2.9
通讯作者：
V. Tulsky;M. Almajid;D. Bauer
中科院分区：
文献类型：
--
作者：
V. Tulsky;M. Almajid;D. Bauer
在S. Skruszewicz et al., Phys.等人的研究中，采用双色共线早偏振激光脉冲的相-相光谱已经被引入并实验应用于强场隧道电离。多光子电离的研究进展，物理学报，33(2),2010(2)。B：是的。生物化学学报，2016,33(4):481 - 481。相-相光谱学背后的思想是以一种系统的方式研究光电子产率的变化，作为强基场分量（载流子频率$\omega$）和弱第二色分量（例如$2\omega$）之间相对相位的函数。感兴趣的观察对象是电子产率相对于相对相变化的光电子动量依赖相，因此称为“相的相”。本文将相相光谱扩展到圆偏振光。具有一个小的，反向旋转$2\omega$ -分量，光电子能谱在极化平面上具有三倍对称性。对于相应的相的相谱也是如此。然而，一个特殊的，非常尖锐的相位翻转$\pi$发生在光电子的一定径向动量，是敏感的激光参数和电离势。将时间相关Schrödinger方程的数值解与强场近似的结果进行了比较。给出了相的相翻转发生时动量的解析表达式。
Phase-of-the-phase spectroscopy using two-color colinearly polarized laser pulses has been introduced and experimentally applied to strong-field tunneling ionization in S. Skruszewicz et al., Phys. Rev. Lett. 115, 043001 (2015) and recently to multiphoton ionization in M. A. Almajid et al., J. Phys. B: At. Mol. Opt. Phys. 50, 194001 (2017). The idea behind phase-of-the-phase spectroscopy is to study in a systematic way the change in the photoelectron yield as a function of the relative phase between the strong fundamental field component (of carrier frequency $\omega$) and a weak, second color component (e.g., $2\omega$). The observable of interest is the photoelectron-momentum-dependent phase of the change in the electron yield with respect to the relative phase, hence the name "phase of the phase." In the present paper, phase-of-the-phase spectroscopy is extended to circularly polarized light. With a small, counter-rotating $2\omega$-component, photoelectron spectra have a three-fold symmetry in the polarization plane. The same is true for the corresponding phase-of-the-phase spectra. However, a peculiar, very sharp phase-flip by $\pi$ occurs at a certain radial momentum of the photoelectron that is sensitive to both laser parameters and the ionization potential. Results from the numerical solution of the time-dependent Schr\"odinger equation are compared to those from the strong-field approximation. An analytical expression for the momentum at which the phase-of-the-phase flipping occurs is presented.