Integral parameters of high-power femtosecond laser radiation during filamentation in air

Alexander A. Zemlyanov; Yuri E. Geints

doi:10.1117/12.675316

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21 April 2006 Integral parameters of high-power femtosecond laser radiation during filamentation in air

Alexander A. Zemlyanov, Yuri E. Geints

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Proceedings Volume 6160, Twelfth Joint International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics; 61601I (2006) https://doi.org/10.1117/12.675316
Event: Twelfth Joint International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics, 2005, Tomsk, Russian Federation

Abstract

The main effective parameters of high-power femtosecond laser radiation (energy transfer coefficient, effective radius, effective duration, limiting angular divergence, and effective intensity) during its propagation along an atmospheric horizontal path under the conditions of filamentation have been investigated theoretically. It is shown that the process of self-action of this radiation is characterized by formation of a nonlinearity layer, after which the radiation propagates linearly with the limiting divergence lower that the initial diffraction-limited divergence of the beam. The effective pulse 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 and weakly depending on the initial spatial focusing of the beam. The coefficient of energy transmission for the femto-second pulse is lower than in the linear medium and has a tendency to decrease with the increase of the power.

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Alexander A. Zemlyanov and Yuri E. Geints "Integral parameters of high-power femtosecond laser radiation during filamentation in air", Proc. SPIE 6160, Twelfth Joint International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics, 61601I (21 April 2006); https://doi.org/10.1117/12.675316

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