Tunnel above-threshold ionization of atoms and generation of short-wavelength radiation

R. V. Kulyagin; N. Yu. Shubin; Vladimir D. Taranukhin

doi:10.1117/12.238042

12 April 1996 Tunnel above-threshold ionization of atoms and generation of short-wavelength radiation

R. V. Kulyagin, N. Yu. Shubin, Vladimir D. Taranukhin

Proceedings Volume 2770, Laser Optics '95 and ICONO '95: Superintense Laser Fields; (1996) https://doi.org/10.1117/12.238042
Event: Laser Optics '95, 1995, St. Petersburg, Russian Federation

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 U_p plus I_p to (Omega) equals f(I) U_p plus I_p (atomic units e equals m equals $HBAR equals 1 are used throughout this paper), where U_p is electron ponderomotive energy and I_p 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 I_cr 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.

Citation Download Citation

R. V. Kulyagin, N. Yu. Shubin, and Vladimir D. Taranukhin "Tunnel above-threshold ionization of atoms and generation of short-wavelength radiation", Proc. SPIE 2770, Laser Optics '95 and ICONO '95: Superintense Laser Fields, (12 April 1996); https://doi.org/10.1117/12.238042

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