11 November 2009 Self-focusing and filamentation of optical vortex beams: spatio-temporal analysis
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We report numerical simulations supported by experimental observations of self-focusing, fillamentation, and supercontinuum generation by an optical vortex beam in a Kerr nonlinear medium in the regime of dominating nonlinearity. Despite the strong self-focusing resulting in multiple filaments ordered along the vortex ring the optical vortex remains well preserved at the exit of the nonlinear medium and in the far-field. The presented quasi-(3+1)- dimensional numerical simulations under azimuthal initial vortex ring perturbations confirm qualitatively the experimentally observed survival of the optical vortex in the course of the white light generation.
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Georgi Maleshkov, Dragomir N. Neshev, Alexander Dreischuh, "Self-focusing and filamentation of optical vortex beams: spatio-temporal analysis", Proc. SPIE 7501, International Conference on Ultrafast and Nonlinear Optics 2009, 75010G (11 November 2009); doi: 10.1117/12.851352; https://doi.org/10.1117/12.851352

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