Document Type

Article

Publication Date

7-14-2016

Publication Title

New Journal of Physics

ISSN

1367-2630

Volume

18

DOI

http://dx.doi.org/10.1088/1367-2630/18/7/073031

Abstract

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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