Spatial coherence singularities and incoherent vortex solitons

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Title: Spatial coherence singularities and incoherent vortex solitons
Author: Motzek, Kristian; Kivshar, Yuri; Shih, Ming-Feng; Swartzlander, Grover Jr
Abstract: We study spatially localized optical vortices created by self-trapping of partially incoherent light with a phase dislocation in a biased photorefractive crystal. In contrast to a decay of coherent self-trapped vortex beams due to the azimuthal modulational instability, the incoherent vortices are stabilized for large values of the spatial incoherence; this was confirmed by experiment. We analyze the spatial coherence properties of the incoherent optical vortices and reveal the existence of ringlike singularities in the spatial coherence function of a vortex field that can characterize the stable propagation of vortices through nonlinear media.
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Date: 2005-07-01

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