Localized light structures with high intensity at multiple filamentation of femtosecond pulses of a Ti:Sapphire laser along an air path
D.V. Apeksimov1, A.A. Zemlyanov1, A.N. Iglakova1, A.M. Kabanov1, O.I. Kuchinskaya1,2, G.G. Matvienko1,2, V.K. Oshlakov1, A.V. Petrov1, E.B. Sokolova1
1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
2National Research Tomsk State University, 36, Lenin Avenue, Tomsk, 634050, Russia
Keywords: лазерное излучение, фемтосекундный импульс, самофокусировка, филаментация, постфиламентационный световой канал, воздух, laser radiation, femtosecond pulse, self-focusing, filamentation, postfilament light channels, air
Abstract
The results of experimental studies of the formation of a transverse structure of a laser beam after multiple filamentation are presented. Ring structures of radiation are formed around individual filaments in the transverse beam cross section inside the region of multiple filamentation, and at a dozen meters from it a common ring structure begins to form surrounding postfilamentation light channels (PFC). It is shown that the spectra of the PFC, rings, and beam are significantly different. The ring spectrum broadens asymmetrically relative to the carrier wave length and is mainly concentrated in the short wavelength region. The PFC spectrum broadens more and more symmetrically and covers the range 600-1100 nm.
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