Abstract
The generation of low-order harmonics by a short ionizing laser pulse passing through a gas is investigated in regard to the space-time phase-synchronism conditions. This investigation is based on the results of hydrodynamic calculations for the model of [1] supplemented by taking into account the ionization current [2–5] and on the numerical solution of a one-dimensional time-dependent Schrödinger equation. As applied to the description of the third-harmonic spectrum, the hydrodynamic model with ionization current is shown to be in good agreement with a quantum-mechanical model. In this case, the amplitude of the third harmonic is determined by the intensity of the laser field at the moment of maximal ionization rate; this fact allows one to relate the amplitude of the third harmonic to the residual energy of electrons [5–8] and may provide grounds for the diagnosis of the residual energy by the spectrum of the third harmonic, which is important for the development of X-ray lasers based on ionization nonequilibrium plasma.
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Translated from Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Fiziki, Vol. 124, No. 3, 2003, pp. 612–624.
Original Russian Text Copyright © 2003 by Andreev, Veisman, Chegotov.
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Andreev, N.E., Veisman, M.E. & Chegotov, M.V. Third-harmonic generation in an ionized gas and its relation to the residual energy of electrons. J. Exp. Theor. Phys. 97, 554–565 (2003). https://doi.org/10.1134/1.1618340
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DOI: https://doi.org/10.1134/1.1618340