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.
Highlights
14 July 2016C Hernández-García, T Popmintchev, M M Murnane, H C Kapteyn, L Plaja, A Becker and A Jaron-Becker
High-order harmonic generation (HHG) is a unique source of coherent radiation extending from the extremeultraviolet (EUV) to the soft x-ray regime [1,2,3]
We find that group velocity matching (GVM) effects are large at long driver wavelengths and for short pulses, motivating a new definition of the group velocity walk-off length that is valid for the extreme non-perturbative nonlinear optics of HHG
Summary
C Hernández-García, T Popmintchev, M M Murnane, H C Kapteyn, L Plaja, A Becker and A Jaron-Becker. Original content from this work may be used under the terms of the Creative Abstract. We analyze the role of group-velocity matching (GVM) in the macroscopic build up of the high-. Any further distribution of harmonic signal generated in gas targets at high pressures. A definition of the walk-off length, this work must maintain attribution to the 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 and DOI. 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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