Generation of lattices of optical vortices
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Square and hexagonal lattices of optical vortices are generated In a saturable nonlinear medium. If the topological charges of the vortices are of the same sign the lattice exhibit rotation, while if alternative, stable propagation of the structures is observed. In a nonlinear medium vortex lattices induce periodic modulation of the refractive index. Diffraction of a probe beam by this optically-induced phase grating is observed.
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Proceedings of SPIE - The International Society for Optical Engineering