Vol. 30, issue 04, article # 5

Apeksimov D.V., Zemlyanov A.A., Kabanov A.M., Stepanov A.N. Post-filamentation light channels in air. // Optika Atmosfery i Okeana. 2017. V. 30. No. 04. P. 291–295 [in Russian].
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Abstract:

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.

Keywords:

laser radiation, femtosecond pulse, filamentation, post-filamentation light channel, focusing, air

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