The European Physical Journal D

, 68:195

High-order harmonic generation at high laser intensities beyond the tunnel regime

  • Jose Antonio Pérez-Hernández
  • Marcelo F. Ciappina
  • Maciej Lewenstein
  • Amelle Zaïr
  • Luis Roso
Regular Article

DOI: 10.1140/epjd/e2014-50086-6

Cite this article as:
Pérez-Hernández, J.A., Ciappina, M.F., Lewenstein, M. et al. Eur. Phys. J. D (2014) 68: 195. doi:10.1140/epjd/e2014-50086-6
Part of the following topical collections:
  1. Topical issue: X-ray Generation from Ultrafast Lasers

Abstract

We present studies of high-order harmonic generation (HHG) at laser intensities well above saturation. We use driving laser pulses which present a particular electron dynamics in the turn-on stage. Our results predict an increasing on the harmonic yield, after an initial dropping, when the laser intensity is increased. This fact contradicts the general belief of a progressive degradation of the harmonic emission at ultrahigh intensities. We have identified a particular set of trajectories which emerges in the turn-on stage of these singular laser pulses, responsible of the unexpected growth on the harmonic efficiency at this high intensity regime. Our study combines two complementary approaches: classical analysis and full quantum mechanical calculations resulting from the numerical integration of the 3-dimensional time-dependent Schrödinger equation complemented with the time-frequency analysis.

Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Jose Antonio Pérez-Hernández
    • 1
  • Marcelo F. Ciappina
    • 2
  • Maciej Lewenstein
    • 3
    • 4
  • Amelle Zaïr
    • 5
  • Luis Roso
    • 1
  1. 1.Centro de Láseres Pulsados (CLPU)Villamayor, SalamancaSpain
  2. 2.Department of PhysicsAuburn UniversityAuburnUSA
  3. 3.ICFO-Institut de Ciències FotòniquesCastelldefels (Barcelona)Spain
  4. 4.ICREA-Institució Catalana de Recerca i Estudis AvançatsBarcelonaSpain
  5. 5.Department of Physics, Blackett LaboratoryImperial College LondonLondonUK
  6. 6.Max-Planck-Institut für QuantenoptikGarchingGermany