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Proceedings Paper

High harmonic generation and attosecond pulse production in dense medium
Author(s): V. V. Strelkov; V. T. Platonenko; A. Becker
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Paper Abstract

We have studied the high harmonic generation and attosecond pulse production in a plasma or gas under conditions when the single-atom response is affected by neighboring ions of the medium. We solve numerically the three dimensional Schroedinger equation for a single-electron atom in the combined fields of the parent ion, the neighboring particles and the laser, and average the results over different random positions of the particles using the Monte-Carlo method. We observe a change of the harmonic properties due to a random variation of the harmonic phase induced by the field of the medium, when the medium density exceeds a certain transition density. The transition density is found to depend on the harmonic order, but it is almost independent of the fundamental intensity. It also differs for the shorter and longer quantum paths. The latter effect leads to a narrowing ofthe harmonic lines and a shortening of the attosecond pulses generated using a group of harmonics. The effect of the medium might be important even for much lower densities in the case of XUV generation using radiation in the micron wavelength regime.

Paper Details

Date Published: 3 February 2006
PDF: 7 pages
Proc. SPIE 5975, Topical Problems of Nonlinear Wave Physics, 59750A (3 February 2006); doi: 10.1117/12.675492
Show Author Affiliations
V. V. Strelkov, Max-Plank-Institut für Physik komplexer Systeme (Germany)
General Physics Institute (Russia)
V. T. Platonenko, M. V. Lomonosov Moscow State Univ. (Russia)
A. Becker, Max-Plank-Institut für Physik komplexer Systeme (Germany)


Published in SPIE Proceedings Vol. 5975:
Topical Problems of Nonlinear Wave Physics

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