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Silahli, Wiktor Walasik","submitted_at":"2017-03-28T21:51:22Z","abstract_excerpt":"Recently, we have predicted that the modulation instability of optical vortex solitons propagating in nonlinear colloidal suspensions with exponential saturable nonlinearity leads to formation of necklace beams (NBs) [S.~Z.~Silahli, W.~Walasik and N.~M.~Litchinitser, Opt.~Lett., \\textbf{40}, 5714 (2015)]. Here, we investigate the dynamics of NB formation and propagation, and show that the distance at which the NB is formed depends on the input power of the vortex beam. 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