BESSEL BEAMS OF ELECTROMAGNETIC-WAVES - SELF-ACTION AND NONLINEAR STRUCTURES

The nonlinear structures arising with the propagation of electromagnetic radiation Bessel beams in plasma are studied. The various mechanisms of the focusing medium nonlinearity and its effect on the spatial modulation of the field intensity are analyzed. The nonlinearity types when a large-scale structure arises simultaneously with the small-scale longitudinal structure of a beam are determined. The photographs of the spatial-periodic plasma structures observed in the experiment during the propagation of Bessel beams are presented. The plasma struktures correspond to small and large-scale structures of the beam modulation. The universal character for displaying the self-modulation effect of Bessel beams independent of the concrete mechanism of the medium nonlinearity is shown.