The volume fraction of the plasma filling of the region of multiple filaments formed in the air by femtosecond radiation at 800 and 248 nm
A.A. Zemlyanov, A.D. Bulygin
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634055, Russia
Keywords: множественная филаментация, фемтосекундная лазерная плазма, перколяция, multiple filamentation, femtosecond laser plasma, percolation
Abstract
The volume fraction of filling of the region of multiple filamentation, formed during propagation of femtosecond laser radiation at 800 and 248 nm wavelengths in air, by plasma formations is studied on the basis of the numerical solution of the nonstationary nonlinear Schrödinger equation. It is ascertained that this fraction for l = 248 nm more than twice exceeds the corresponding values for l = 800 nm and can exceed the percolation threshold in terms of the level of plasma density required for occurrence of breakdown.
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