Abstract
We consider the regularities of the femtosecond laser pulse propagation from the viewpoint of evolution of its effective parameters (energy transfer coefficient, effective beam radius, effective pulse duration, limiting angular divergence, and effective intensity). Based on the concepts of the spatial self-action zones we present a thorough analysis of beam effective parameters variation along the propagation path, discussing the regime of formation of a single axial filament. Filamentation behavior of femtosecond laser pulses in the air in the presence of aerosol on the optical path is considered also. The effect of a localized attenuating layer modeling an aerosol medium, on spatial extension and evolution of the light filament, is investigated.
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