Dynamics of electromagnetic beam with phase dislocation in saturable nonlinear media

Abstract The nonlinear dynamics of laser beams carrying phase singularity in media with cubic–quintic nonlinearity is studied. In such media can be generated not only localized vortex solitons but also a novel kind of stable nonlocalized optical vortices. Stability in the defocusing regime is confirmed numerically. In the focusing regime such a vortex breaks into filaments. Dynamics of a singular Gaussian beam is investigated. Numerical simulations show a new behavior of the supercritical Gaussian beam which first breaks into filaments coalescing after.

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