Abstract: We demonstrate experimentally the generation of second-harmonic conical waves via parametric frequency doubling in a two-dimensional annular periodically poled nonlinear photonic structure fabricated in a stoichiometric lithium tantalate crystal. We apply the concept of nonlinear Bragg diffraction for explaining this effect, and show theoretically that in low-symmetry crystals this process result, in generated second-harmonic waves being a superposition of the Bessel beams.

Keywords: nonlinear optics; frequency conversion; harmonic generation; diffraction; scattering;; nonlinear photonic crystals; diffraction; linbo3; reflection; scattering; domains; blue

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