Effects of laser pulsewidth on higher-order harmonic generation in the barrier-suppression-ionization intensity regime |
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| Authors: | M Kakehata H Takada K Miyazaki H Kono I Kawata Y Fujimura |
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| Institution: | (1) Optoelectronics Division, Electrotechnical Laboratory, 1-1-4 Umezono, Tsukuba, Ibaraki 305-8568, Japan (Fax: +81-298/54-3349, E-mail: kakehata@etl.go.jp), JP;(2) Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan, JP |
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| 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.
Received: 19 March 1999 / Revised version: 13 August 1999 / Published online: 27 October 1999 |
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| Keywords: | PACS: 42 65 Ky 32 80 Rm |
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