Effects of laser pulsewidth on higher-order harmonic generation in the barrier-suppression-ionization intensity regime

M. Kakehata, H. Takada, K. Miyazaki, H. Kono, I. Kawata, Y. Fujimura

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

We studied the highest harmonic photon energies of high-order harmonic generation (HHG) for He, Ne, Ar, Kr, Xe, and N2. This research employed 65-fs and 150-fs Ti:sapphire laser pulses, of which the peak intensities in a vacuum are higher than the barrier-suppression-ionization (BSI) intensities. We fitted two analytical formulae to the experimental results of HHG. One formula, which was obtained by fitting an analytical formula to the results by a quantum mechanical simulation of HHG, expresses the highest interaction intensity by a function of the BSI intensity and the Keldysh γ-parameter. The other formula is derived by introducing the saturation intensity of HHG, which was proposed by Chang et al. [Phys. Rev. Lett. 79, 2967 (1997)]. We discuss the highest interaction intensity for the condition when the peak laser intensities are higher than the BSI intensities.

Original languageEnglish
Pages (from-to)219-224
Number of pages6
JournalApplied Physics B: Lasers and Optics
Volume70
Issue number2
DOIs
Publication statusPublished - 2000 Feb

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

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