Vol. 30, issue 09, article # 1

Apeksimov D.V., Zemlyanov A.A., Iglakova A.N., Kabanov A.M., Kuchinskaya O.A., Matvienko G.G., Oshlakov V.K., Petrov A.V. Global self-focusing and features of multiple filamentation of radiation of a subterawatt titanium-sapphire laser with centimeter output aperture along 150-m path. // Optika Atmosfery i Okeana. 2017. V. 30. No. 09. P. 727–732 [in Russian].
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Abstract:

The formation and propagation of postfilamentation channels along a controllable path 150 m long are studied experimentally for collimated beams of different diameters. During multiple filamentation, a laser beam is compressed in global focus, after the passage of which its angular divergence is much greater than the divergence of postfilamentation channels generated during the filamentation. It is shown that postfilamentation channels have the intensity sufficient for the formation of multiple filamentation in optical elements after the end of the filamentation region at distances much longer than the filamentation length.

Keywords:

laser radiation, femtosecond pulse, self-focusing, filamentation, postfilament light channels, focusing, air

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