Photoelectron holography in tunneling ionization of atoms by counter-rotating two-color elliptically polarized laser field

Xue-Fei Huang,Jian-Ying Liao,Cheng Huang,Ying-Bin Li,Jie Su

doi:10.7498/aps.71.20212226

Abstract

In this paper, photoelectron interference in tunneling ionization of atoms by counter-rotating two-color elliptically polarized (TCEP) laser fields are investigated by numerically solving the two-dimensional time-dependent Schrödinger equation (TDSE) and strong field approximation (SFA). When the ellipticities of the two pulses are both 0.3, for a relative phase of 0.25π, the intracycle interference, fork-like holographic interference and arc-like holographic interference in the photoelectron momentum distribution overlap with each other. For a relative phase of 0, the arc-like holographic interference disappears and the intracycle interference and fork-like holographic interference are fully separated into the –px direction and the +px direction. Furthermore, the independent fork-like holographic interference can be enhanced or suppressed by changing the ellipticities of the two pulses. This provides an efficient tool for controlling and separating the interference structures in the photoelectron momentum distribution, which facilitates extracting the information about the target structure and the photoelectron ultrafast dynamics in strong fields.

Highlights

的椭偏率均为 0.3 Fig. 1. (a, b) Combined laser electric field E(t) and the corresponding negative vector potential -A(t) for counter-rotating two-color elliptically polarized (TCEP) fields. (c, d) Photoelectron momentum distributions of Ar ionized by counter-rotating TCEP fields. (a), (c) φ=0.25π; (b), (d) φ=0
均为 0.3. 相对相位 φ=0.25π Fig. 2. (a) Time evolutions of the distances between the electron and the parent ion for different ionization times. (b) The x and y components of counter-rotating TCEP fields. (c) The simulated interference pattern between the direct electrons ionized during A and the direct electrons ionized during B with strong field approximation (SFA). (d) The simulated interference pattern between the rescattering electrons and the direct electrons ionized during A with SFA. (e) The simulated interference pattern between the rescattering electrons ionized during A and the direct electrons ionized during B with SFA
均为 0.3. 相对相位 φ=0 Fig. 3. (a) Time evolutions of the distances between the electron and the parent ion for different ionization times. (b) The x and y components of counter-rotating TCEP fields. (c) The simulated interference pattern between the direct electrons ionized during C and the direct electrons ionized during D with SFA. (d) The simulated interference pattern between the rescattering electrons and the direct electrons ionized during C with SFA. (e) The simulated interference pattern between the rescattering electrons during C and the direct electrons ionized during D with SFA

Summary

Introduction

本文利用反向旋转双色 (800nm+1600nm) 椭偏 (two-color elliptically polarized, TCEP) 激光场驱动氩原子隧穿电离, 研究该复合本文利用数值求解二维含时薛定谔方程(time-dependent Schrödinger equation, TDSE)和 SFA 理论来研究反向旋转 TCEP 中氩原子隧穿电离电子之间的干涉. 激发电子近似下 Ar 原子的 TDSE 为: i (r,t) = H (r,t) (r,t ) 1 和 2 分别为 1600nm 和 800nm 激光脉冲的角频率.

Results

Conclusion