Improvement of the Cerenkov Radiative Second Harmonic Generation in the Slab Waveguide with a Periodic Nonlinear Optical Susceptibility

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Abstract
Introducing a periodically corrugated nonlinear optical (NLO) susceptibility χ(2) in the guiding layer of a three-layered slab waveguide, we propose a Cerenkov radiative second harmonic generation (SHG) with numerical calculations, and experimentally demonstrate it. With vinylidene cyanide/vinyl acetate copolymer film having a sinusoidal χ(2) corrugation of 60 µm period as a guiding layer, the Cerenkov scheme of SHG was enhanced over a wide film thickness range at 1.06-µm fundamental wavelength, obtaining an enhancement factor of ∼1.5 in comparison with a uniform χ(2) scheme. Experimental dependences of the SHG power on both corrugation period and path length agree well with theoretical estimates, indicating usefulness of the modified Cerenkovian SHG with the corrugated χ(2).