Abstract
Experimental data on self-focusing and filamentation of high-power ultrashort laser pulses for wide-aperture (centimeter) beams of sub-terawatt power are interpreted on the basis of the diffraction-ray model of single filamentation. The intensity inhomogeneities in the initial transverse profile of the laser beam, the Kerr self-focusing of which leads to the formation of high-intensity light channels, are considered. The parameters of these inhomogeneities are estimated, which is important for numerical simulation of multiple filamentation of ultrashort laser pulses along atmospheric paths.
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