Nonlinear dynamics of two-color optical vortices in lithium niobate crystals.
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We study experimentally the nonlinear dynamics of two-color optical vortex beams in the presence of second-harmonic generation combined with the effects of photo- and thermal refraction, as well as self- and induced-phase modulation. We use an iron-doped lithium niobate crystal as a nonlinear medium for the vortex propagation and observe experimentally, depending on the laser wavelength, a decay of a double-charge vortex, splitting and reshaping of background beam, pattern formation, and controllable nonlinear rotation of a vortex pair.
complete list of authors
Dreischuh, Alexander||Neshev, Dragomir N||Kolev, Vesselin Z||Saltiel, Solomon||Samoc, Marek||Krolikowski, Wieslaw||Kivshar, Yuri S