High-order harmonic generation at high laser intensities beyond the tunnel regime
Abstract
We present studies of high-order harmonic generation (HHG) at laser intensities well above saturation. We use driving laser pulses which present a particular electron dynamics in the turn-on stage. Our results predict an increasing on the harmonic yield, after an initial dropping, when the laser intensity is increased. This fact contradicts the general belief of a progressive degradation of the harmonic emission at ultrahigh intensities. We have identified a particular set of trajectories which emerges in the turn-on stage of these singular laser pulses, responsible of the unexpected growth on the harmonic efficiency at this high intensity regime. Our study combines two complementary approaches: classical analysis and full quantum mechanical calculations resulting from the numerical integration of the 3-dimensional time-dependent Schr\"odinger equation complemented with the time-frequency analysis.
Keywords
Cite
@article{arxiv.1404.6180,
title = {High-order harmonic generation at high laser intensities beyond the tunnel regime},
author = {J. A. Pérez-Hernández and M. F. Ciappina and M. Lewenstein and A. Zaïr and L. Roso},
journal= {arXiv preprint arXiv:1404.6180},
year = {2015}
}