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Group velocity matching in high-order harmonic generation driven by mid-infrared lasers

  • Author(s): Hernández-García, C
  • Popmintchev, T
  • Murnane, MM
  • Kapteyn, HC
  • Plaja, L
  • Becker, A
  • Jaron-Becker, A
  • et al.

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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