Zonal model of nonstationary self-focusing of femtosecond laser radiation in
air: effective beam characteristics evolution |
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Authors: | A A Zemlyanov Y E Geints |
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Institution: | (1) Institute of Atmospheric Optics, Siberian Branch of the Russian Academy of Sciences, Academicheskii ave. 1, 634055 Tomsk, Russia |
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Abstract: | The generic scenario of intense femtosecond laser pulse propagation in the
air from the viewpoint of evolution of its integral effective parameters
(energy transfer coefficient, effective radius, effective duration, limiting
angular divergence) is considered. The analysis of variation of the
effective parameters along the propagation path in the single and multiply
filamentation scenarios based on numerical calculations is presented. It is
shown that the process of self-action of the ultrashort radiation is
characterized by the formation in a medium of the nonlinearity layer, after
which optical pulse propagates quasi-linearly with the limiting angular
divergence that depends mainly on initial pulse power. The effective pulse
temporal duration and the effective beam radius increase after the passage
through the nonlinearity layer, and their values are mostly determined by
the initial beam power also. The coefficient of energy transmission of
femtosecond laser radiation is lower than in the linear medium and has a
tendency to decrease with the increase of the pulse power. |
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Keywords: | 42 25 Bs Wave propagation transmission and absorption 42 68 Ay Propagation transmission attenuation and radiative transfer 42 65 Jx Beam trapping self-focusing and defocusing self-phase modulation |
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