Dynamics of light structures during filamentation of femtosecond laser pulses in air
A.A. Zemlyanov, A.D. Bulygin, Yu.E. Geints, O.V. Minina
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
Keywords: самофокусировка, филаментация, дифракционно-лучевая трубка, постфиламентационный канал, self-focusing, filamentation, diffraction-beam tube, post-filamentation channel
Abstract
A model of single filamentation of a high-power ultrashort light pulse has been developed on the basis of evolutionary dependences of phase and amplitude parameters of the light field derived from numerical solution of the nonlinear Schrödinger equation for air. A key role of aberrations and diffraction effects during formation of stable dynamic light structures near the propagation axis is shown. It is found that the angular divergence of post-filamentation light channel decreases with increasing radius of the laser beam at a fixed pulse peak power and reaches saturation at the radius greater than 1 mm.
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