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Proceedings Paper

Tunnel above-threshold ionization of atoms and generation of short-wavelength radiation
Author(s): R. V. Kulyagin; N. Yu. Shubin; Vladimir D. Taranukhin
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Paper Abstract

Semiclassical approach has been developed to investigate above-threshold ionization of atoms in high intensity laser field. Influence of Coulomb potential of parent ion and relativistic effects on electron motion in the continuum and electron wavepacket spreading were taken into account. Numerical simulations show that these factors lead to modification of cut-off frequency law from the well known formula (Omega) equals 3.17 Up plus Ip to (Omega) equals f(I) Up plus Ip (atomic units e equals m equals $HBAR equals 1 are used throughout this paper), where Up is electron ponderomotive energy and Ip is atom ionization potential. Function f(I) exceeds the 3.17 value at relatively low laser intensities and decreases with laser intensity growth to almost zero. It is shown that a maximum cut-off frequency (Omega) max should exist. The critical laser intensity corresponding to this frequency Icr on the order of (omega) 2, where (omega) is laser frequency. Also, we present an explanation of processes resulting in the formation of behind cut-off region of high harmonic spectra.

Paper Details

Date Published: 12 April 1996
PDF: 7 pages
Proc. SPIE 2770, Laser Optics '95 and ICONO '95: Superintense Laser Fields, (12 April 1996); doi: 10.1117/12.238042
Show Author Affiliations
R. V. Kulyagin, Moscow State Univ. (Russia)
N. Yu. Shubin, Moscow State Univ. (Russia)
Vladimir D. Taranukhin, Moscow State Univ. (Russia)

Published in SPIE Proceedings Vol. 2770:
Laser Optics '95 and ICONO '95: Superintense Laser Fields
Alexander A. Andreev; Vyacheslav M. Gordienko, Editor(s)

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