# High-harmonic generation enhanced by laser-induced electron recollision

## TL;DR

This paper uses advanced simulations to show how electron recollision enhances high-harmonic generation in alkali-metal atoms, revealing new insights into electron correlation dynamics with potential applications in attosecond science.

## Contribution

It demonstrates that laser-induced electron recollision significantly enhances high-harmonic spectra, offering a new way to explore electron correlation in strong laser fields.

## Key findings

- Extended harmonic plateau beyond usual cutoff
- Resonance peak above the plateau
- Enhanced cation response due to recollision

## Abstract

We theoretically investigate correlated electron dynamics in high-harmonic generation (HHG), using all-electron \emph{ab initio} simulations for three-dimensional real alkali-metal atoms. The resulting harmonic spectra exhibit a plateau extended beyond the usual cutoff and a prominent resonance peak above the plateau. These remarkable features arise from the cation response dramatically enhanced by laser-induced electron recollision, which is a key process of attosecond science. This demonstrates that high-harmonic spectroscopy provides new possibilities to explore dynamical electron correlation in strong laser pulses.