Vol. 21, issue 10, article # 5

Geints Yu. E., Zemlyanov A. A. Self-focusing of ultrashort laser pulse with super-Gaussian spatial profile of intensity. // Atmospheric and oceanic optics. 2008. V. 21. No. 10. P. 738-742. PDF
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Abstract:

The non-stationary self-focusing of femtosecond laser radiation with Gaussian and super-Gaussian spatial profiles of intensity in air in the single filamentation mode have been studied theoretically. The formalism of effective beam parameters is used; the analytical expressions are derived allowing calculating key self-focusing parameters of beams with non-Gaussian profile. Qualitative and quantitative similarity of the initial evolution stage of effective radius of such beams from the generalized evolutionary variable at distances up to global nonlinear focus is established.

Keywords:

ultrashort laser radiation, non-stationary self-focusing, average beam parameters, non-Gaussian beams