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Below-threshold nonsequential double ionization with linearly polarized two-color fields. I. Symmetry and dominance

S. Hashim1, D. Habibović2, and C. Figueira de Morisson Faria1,3

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Phys. Rev. A 112, 023118 – Published 27 August, 2025

DOI: https://doi.org/10.1103/b6b3-mt29

Abstract

We investigate laser-induced nonsequential double ionization with linearly polarized bichromatic fields, focusing on the recollision-excitation with subsequent ionization (RESI) mechanism. Using the strong-field approximation, we assess how the symmetries of the field influence the dominant events. Furthermore, we show that, by manipulating the field parameters such as the field frequencies and relative phase between the two driving waves, one can influence the correlated electron-momentum distributions. Specific features of a linearly polarized bichromatic field are that the momentum distributions of the second electron are no longer centered around vanishing momenta and that there may be more than one ionization event per half-cycle. This can be used to confine the RESI distributions to specific momentum regions and to determine a hierarchy of parameters that make an event dominant.

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Below-threshold nonsequential double ionization with linearly polarized two-color fields. II. Quantum interference

S. Hashim, D. Habibović, and C. Figueira de Morisson Faria
Phys. Rev. A 112, 023119 (2025)

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Phys. Rev. A 112, 023118– Published 27 August, 2025
  • Received 8 April 2025
  • Accepted 4 August 2025
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