Dreischuh, AlexanderNeshev, DragomirKolev, Vesselin ZSaltiel, SolomonSamoc, MarekKrolikowski, WieslawKivshar, Yuri2009-06-042010-12-202009-06-042010-12-20Optics Express 16.8 (2008): 5406-54201094-4087http://hdl.handle.net/10440/407http://digitalcollections.anu.edu.au/handle/10440/407We 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.15 pages"OSA will grant the authors permission to deposit the publisher’s pdf from their Optics Express articles into the repository with the proper citation (reference number or journal /volume/page/year citation)." - from email received from Authorized Agent, The Optical Society, 27/05/10Nonlinear optics, transverse effects inNonlinear opticsFrequency conversionSelf-action effectsPhotorefractive nonlinear optics2008-04-0310.1364/OE.16.0054062015-12-08