11 November 2009 Femtosecond pulses in air: linear and nonlinear regime
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In linear regime the single and few cycle femtosecond (fs) pulses propagates on several diffraction lengths changing their shape in semi-spherical (or parabolic) form, far away from plane wave and paraxial approximation. The experiments with fs pulses in air with power little above the critical for self-focusing (nonlinear regime) demonstrated new nonlinear effects as self-guiding, THz longitudinal emission and superbroad enlarging of the spectrum. In this paper we continue with developing of new theoretical model for quantitative description of the above experimental results.
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Lubomir M. Kovachev, Lubomir M. Kovachev, Kamen L. Kovachev, Kamen L. Kovachev, Ivaylo Tunchev, Ivaylo Tunchev, } "Femtosecond pulses in air: linear and nonlinear regime", Proc. SPIE 7501, International Conference on Ultrafast and Nonlinear Optics 2009, 75010E (11 November 2009); doi: 10.1117/12.849380; https://doi.org/10.1117/12.849380

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