Group velocity matching in high-order harmonic generation driven by mid-infrared lasers
We analyze the role of group-velocity matching (GVM) in the macroscopic build up of the high-harmonic signal generated in gas targets at high pressures. A definition of the walk-off length, associated with GVM, in the non-perturbative intensity regime of high-harmonic generation is given. Semiclassi...
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Published in | New journal of physics Vol. 18; no. 7; pp. 73031 - 73039 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Bristol
IOP Publishing
14.07.2016
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Subjects | |
Online Access | Get full text |
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Summary: | We analyze the role of group-velocity matching (GVM) in the macroscopic build up of the high-harmonic signal generated in gas targets at high pressures. A definition of the walk-off length, associated with GVM, in the non-perturbative intensity regime of high-harmonic generation is given. Semiclassical predictions based on this definition are in excellent agreement with full quantum simulations. We demonstrate that group velocity matching is a relevant factor in high harmonic generation and the isolation of attosecond pulses driven by long wavelength lasers and preferentially selects contributions from the short quantum trajectories. |
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Bibliography: | NJP-104445.R2 |
ISSN: | 1367-2630 1367-2630 |
DOI: | 10.1088/1367-2630/18/7/073031 |