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.
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Received: 19 March 1999 / Revised version: 13 August 1999 / Published online: 27 October 1999
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Kakehata, M., Takada, H., Miyazaki, K. et al. Effects of laser pulsewidth on higher-order harmonic generation in the barrier-suppression-ionization intensity regime . Appl Phys B 70, 219–224 (2000). https://doi.org/10.1007/s003400050035
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DOI: https://doi.org/10.1007/s003400050035