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We report on the experimental observation of nonlinear localization of light in azimuthally modulated Bessel photonic lattices. These lattices are optically induced in a photorefractive crystal and resemble multiple-core highly nonlinear microstructure fibers.
The phase-matching conditions of interacting X-waves in nonlinear crystals are obtained for the first time. The range of X-wave velocities feasible for phase-matching is determined. It is demonstrated experimentally that angular dispersion of the waves excited in optical parametric generator by quasimonochromatic pump corresponds to angular dispersion of nondiffracting pulsed beams.
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