Frequency chirp of harmonic and attosecond pulses

Katalin Varju, Y Mairesse, B Carre, Mette Gaarde, Per Johnsson, S Kazamias, Rodrigo Lopez, Johan Mauritsson, Kenneth Schafer, P Balcou, Anne L'Huillier, P Salieres

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We study the phase of the atomic polarization in the process of high-order harmonic generation. Its dependence on the laser intensity and the harmonic order induce a frequency variation in time (chirp) respectively of the harmonic pulses and attosecond pulses. We review the recent experimental results on the temporal characterization of the harmonic emission and show that measurements performed using very different techniques (like XFROG and RABITT), probing the phase in different parameter spaces, can be connected through the mixed phase derivatives, demonstrating the common underlying physics
Original languageEnglish
Pages (from-to)379-394
JournalJournal of Modern Optics
Issue number2-3
Publication statusPublished - 2005

Subject classification (UKÄ)

  • Atom and Molecular Physics and Optics


  • parameter spaces
  • frequency variation
  • temporal characterization
  • frequency chirp
  • harmonic pulses
  • atomic polarization phase
  • attosecond pulses
  • high-order harmonic generation
  • harmonic order
  • laser intensity
  • harmonic emission


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