Vol. 30, issue 11, article # 2

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.

Keywords:

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

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