Triggering recollisions with XUV pulses: Imprint of recolliding periodic orbits

TL;DR

This paper demonstrates that XUV pulses can reliably induce electron recollisions in atoms driven by elliptically polarized IR fields, by analyzing recolliding periodic orbits and their stability across different laser parameters.

Contribution

It introduces a method to identify XUV parameters that trigger recollisions via recolliding periodic orbits, applicable across various atom species and IR ellipticities.

Findings

XUV pulses can induce recollisions regardless of IR ellipticity.

Recolliding periodic orbits (RPOs) are key to understanding recollision conditions.

The stability and location of RPOs depend on IR intensity and ellipticity.

Abstract

We consider an electron in an atom driven by an infrared (IR) elliptically polarized laser field after its ionization by an ultrashort extreme ultraviolet (XUV) pulse. We find that, regardless of the atom species and the laser ellipticity, there exists XUV parameters for which the electron returns to its parent ion after ionizing, i.e., undergoes a recollision. This shows that XUV pulses trigger efficiently recollisions in atoms regardless of the ellipticity of the IR field. The XUV parameters for which the electron undergoes a recollision are obtained by studying the location of recolliding periodic orbits (RPOs) in phase space. The RPOs and their linear stability are followed and analyzed as a function of the intensity and ellipticity of the IR field. We determine the relation between the RPOs identified here and the ones found in the literature and used to interpret other types of highly nonlinear phenomena for low elliptically and circularly polarized IR fields.