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Anne L'Huillier

Anne l'Huillier

Professor

Anne L'Huillier

Generalized phase-matching conditions for high harmonics : The role of field-gradient forces

Author

  • Philippe Balcou
  • Pascal Sali`eres
  • Anne L'Huillier
  • Maciej Lewenstein

Summary, in English

We present an approach to describe the phase matching of high harmonics emitted by laser driven atoms in a nonperturbative regime, for which the atomic response displays an intrinsic intensity-dependent phase. We show that the traditional phase-matching conditions involving conservation of wave vectors should be modified by taking into account the gradient of this atomic phase. We investigate various focusing geometries and interpret the numerical results of Sali`eres et al. [Phys. Rev. Lett. 74, 3776 (1995)]. Within the framework of the two-step model, we demonstrate that the gradient of the intensity-dependent phase can be considered as the canonical momentum gained by the electron in the continuum due to acceleration by field-gradient forces, including in particular the ponderomotive force.

Department/s

  • Department of Physics

Publishing year

1997-04-01

Language

English

Pages

3204-3210

Publication/Series

Physical Review A (Atomic, Molecular and Optical Physics)

Volume

55

Issue

4

Document type

Journal article

Publisher

American Physical Society

Topic

  • Atom and Molecular Physics and Optics

Status

Published

ISBN/ISSN/Other

  • ISSN: 1050-2947