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Atmospheric and Oceanic Optics

2017 year, number 4

Post-filamentation light channels in air

D.V. Apeksimov1, A.A. Zemlyanov1, A.M. Kabanov1, A.N. Stepanov2
1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
2Institute of Applied Physics of the Russian Academy of Sciences, 46 Ul'yanov Street, 603950, Nizhny Novgorod, Russia
Keywords: лазерное излучение, фемтосекундный импульс, филаментация, постфиламентационный световой канал, фокусировка, воздух, laser radiation, femtosecond pulse, filamentation, post-filamentation light channel, focusing, air


The results are presented of experimental studies of spatial characteristics of postfilamentation light channels in air formed by femtosecond pulses of Ti:Sapphire laser with different energy for focused and collimated beams. It was found that for a focused beam in the far zone from the filamentation region, the angular divergence of channels is dozens of times lower than the angular divergence of the beam as a whole. The angular divergence of the channels is first significantly reduced with an increase of the pulse energy, then goes into a saturation mode. For collimated beams, at a fixed distance from the source, an increase in the pulse energy also leads to stabilization of the transverse dimension of the channel