Role of Excited States In High-order Harmonic Generation
Atomic Physics
2016-11-15 v3
Abstract
We investigate the role of excited states in High-order Harmonic Generation by studying the spectral, spatial and temporal characteristics of the radiation produced near the ionization threshold of argon by few-cycle laser pulses. We show that the population of excited states can lead either to direct XUV emission through Free Induction Decay or to the generation of high-order harmonics through ionization from these states and recombination to the ground state. By using the attosecond lighthouse technique, we demonstrate that the high-harmonic emission from excited states is temporally delayed by a few femtoseconds compared to the usual harmonics, leading to a strong nonadiabatic spectral redshift.
Keywords
Cite
@article{arxiv.1603.07905,
title = {Role of Excited States In High-order Harmonic Generation},
author = {Samuel Beaulieu and Seth Camp and Dominique Descamps and Antoine Comby and Vincent Wanie and Stéphane Petit and François Légaré and Kenneth J. Schafer and Mette B. Gaarde and Fabrice Catoire and Yann Mairesse},
journal= {arXiv preprint arXiv:1603.07905},
year = {2016}
}
Comments
Accepted at Physical Review Letters