Effective Parameters of High-Power Laser Femtosecond Radiation at Self-focusing in Gas and Aerosol Media

Abstract

AbstractWe 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.KeywordsAerosol Optical DepthEffective ParameterFemtosecond Laser PulseFemtosecond PulseFilament LengthThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.