Transient optical gain in strong-field-excited solids
Mesoscale and Nanoscale Physics
2021-08-25 v1
Abstract
Multiphoton excitation of a solid by a few-cycle, intense laser pulse forms a very non-equilibrium distribution of charge carriers, where occupation probabilities do not necessarily decrease with energy. We show that, under certain conditions, significant population inversion can emerge between pairs of valence- or conduction-band states, where transitions between the Bloch states are dipole-allowed. This population inversion leads to stimulated emission in a laser-excited solid at frequencies where the unperturbed solid is transparent. We establish the optimal conditions for observing the strong-field-induced optical gain.
Cite
@article{arxiv.2002.05040,
title = {Transient optical gain in strong-field-excited solids},
author = {Muhammad Qasim and Dmitry A. Zimin and Vladislav S. Yakovlev},
journal= {arXiv preprint arXiv:2002.05040},
year = {2021}
}