# Non-sequential double ionization with near-single cycle laser pulses

## TL;DR

This paper uses a semiclassical model to study non-sequential double ionization of argon atoms driven by near-single-cycle laser pulses, revealing detailed electron momentum distributions and the transition from strong to soft recollisions with increasing laser intensity.

## Contribution

It introduces a three-dimensional semiclassical model that accurately reproduces experimental electron momentum patterns and elucidates the transition mechanisms in double ionization under intense, near-single-cycle laser pulses.

## Key findings

- Good agreement with experimental momentum distributions.
- Identification of transition from strong to soft recollisions.
- Reproduction of anti-correlation momentum pattern at high intensities.

## Abstract

A three-dimensional semiclassical model is used to study double ionization of Ar when driven by a near-infrared and near-single-cycle laser pulse for intensities ranging from 0.85$\times$10$^{14}$ W/cm$^{2}$ to 5$\times$10$^{14}$ W/cm$^{2}$. Asymmetry parameters, distributions of the sum of the two electron momentum components along the direction of the polarization of the laser field and correlated momenta are computed as a function of intensity and of the carrier envelope phase. A very good agreement is found with recently obtained results in kinematically complete experiments employing near-single-cycle laser pulses. Moreover, the contribution of the direct and delayed pathways of double ionization is investigated for the above observables. Finally, an experimentally obtained anti-correlation momentum pattern at higher intensities is reproduced with the three-dimensional semiclassical model and shown to be due to a transition from strong to soft recollisions with increasing intensity.