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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Bibliographic Details
Published inNew journal of physics Vol. 18; no. 7; pp. 73031 - 73039
Main Authors Hernández-García, C, Popmintchev, T, Murnane, M M, Kapteyn, H C, Plaja, L, Becker, A, Jaron-Becker, A
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 14.07.2016
Subjects
Attosecond pulses
EUV/soft x-ray
Group velocity
group velocity matching
Harmonic generations
high harmonic generation
Infrared analysis
Infrared lasers
Matching
mid-infrared lasers
Physics
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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.
Bibliography:NJP-104445.R2
ISSN:1367-2630
1367-2630
DOI:10.1088/1367-2630/18/7/073031