Coherent buildup of high harmonic radiation: the classical perspective.
We present a classical model for high harmonic generation during the propagation of an intense laser pulse through an atomic gas. Numerical simulations of the model show excellent quantitative agreement with the corresponding quantum model for the blueshift and intensity reduction of the propagating laser pulse over experimentally realistic propagation distances. Furthermore, phase-space analysis of the classical model uncovers the mechanism behind an intriguing feature of the quantum high-harmonic spectrum: a significant extension of the high-harmonic cutoff beyond the $3.17U_p+I_p$ cutoff law.
Publisher URL: http://arxiv.org/abs/1801.09727
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