A. A. Dergachev, A. A. Ionin, V. P. Kandidov, L. V. Seleznev, D. V. Sinitsyn, E. S. Sunchugasheva, S. A. Shlenov, “Filamentation of IR and UV femtosecond pulses upon focusing in air”, Kvantovaya Elektronika, 2013, Volume 43, Number 1,Pages <nobr>29

This article is cited in 25 papers

Nonlinear optical phenomena

Filamentation of IR and UV femtosecond pulses upon focusing in air

A. A. Dergachev^ab, A. A. Ionin^c, V. P. Kandidov^ab, L. V. Seleznev^c, D. V. Sinitsyn^c, E. S. Sunchugasheva^c, S. A. Shlenov^ab

^a Lomonosov Moscow State University, Faculty of Physics
^b International Laser Center of Moscow State University
^c P. N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow

Abstract: The filamentation of IR and UV laser pulses has been studied numerically and experimentally for different initial beam focusing geometries, and linear electron density profiles along the plasma channel of filaments have been obtained. The results demonstrate that changes in laser beam focusing have a stronger effect on filament and plasma channel parameters for UV radiation than for IR radiation. Focusing causes individual high fluence regions produced by refocusing to merge to form a continuous extended filament with a continuous plasma channel.

Keywords: filamentation, femtosecond laser pulse, laser-induced plasma, UV filaments.

PACS: 42.65.Jx, 42.60.Jf, 52.38.Hb, 52.50.Jm

Received: 25.09.2012
Revised: 16.10.2012