Journal
JAPANESE JOURNAL OF APPLIED PHYSICS
Volume 47, Issue 8, Pages 6777-6783Publisher
JAPAN SOCIETY APPLIED PHYSICS
DOI: 10.1143/JJAP.47.6777
Keywords
nonlinear optics; frequency conversion; harmonic generation; diffraction; scattering
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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.
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