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High-order harmonic cut-off frequency in atomic silver irradiated by femtosecond laser pulses: theory and experiment

  • Anatoly V. Andreev
  • Rashid A. Ganeev
  • Hiroto Kuroda
  • Sergey Yu StremoukhovEmail author
  • Olga A. Shoutova
Regular Article

Abstract

The results of theoretical and experimental study of high-order optical harmonic generation in the ensemble of silver atoms irradiated by intense femtosecond pulses of Ti:Sapphire laser are presented. It is shown that the photoemission spectra exhibit unusual behavior when the laser field strength approaches near-atomic values. In subatomic field strength the cut-off frequency increases linearly with laser pulse intensity. However, when the field strength approaches near-atomic region firstly cut-off frequency slows down and then saturates. To give new interpretation of such kind of photoemission spectrum behavior we have proposed the light-atom interaction theory based on the use of eigenfunctions of boundary value problem for “the atom in an external field” instead of the traditional basis of the “free atom” eigenfunctions. The results of computer simulations clearly demonstrate saturation of the cut-off frequency at near-atomic strength of a laser field. The problem of angular divergence of a harmonic emission is analyzed.

Keywords

Ultraintense and Ultra-short Laser Fields 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Anatoly V. Andreev
    • 1
  • Rashid A. Ganeev
    • 2
    • 3
  • Hiroto Kuroda
    • 3
    • 4
  • Sergey Yu Stremoukhov
    • 1
    Email author
  • Olga A. Shoutova
    • 1
  1. 1.Faculty of Physics, M.V. Lomonosov Moscow State UniversityMoscowRussia
  2. 2.Voronezh State UniversityVoronezhRussia
  3. 3.Institute for Solid State Physics, University of TokyoChibaJapan
  4. 4.Faculty of Medicine, Saitama Medical UniversitySaitamaJapan

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