Vol. 32, issue 08, article # 1

Abstract:

Characteristics of the multiple filamentation domain in air are estimated on the basis of the numerical solution of the nonlinear Schrödinger equation in the single filamentation problem statement. The method of diffraction-beam tubes was used to describe the single filamentation of laser pulses. The effectiveness of this method for interpreting experimental results and predicting effects is shown, which is important when planning experiments. The characteristic size of small-scale intensity inhomogeneities in the laser centimeter-radius beam profile, which form a multiple filamentation domain for femtosecond pulses, is shown to be several millimeters. An increase in the original laser beam radius during telescoping increases the sizes of the initial small-scale intensity irregularities, which increases the filamentation start distance. An increase in initial beam power contributes to the elongation of the filaments and increases their number.

Keywords:

femtosecond laser pulses, air, self-focusing, filamentation, diffraction-beam tube

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