Ferroelectric-domain inversion induced by SiO 2 cladding for LiNbO 3 waveguide SHG

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Abstract
It was found that, by heating an LiNbO3 crystal with SiO2 cladding on the + z face, ferroelectric-domain inversion is induced under the cladding. The inversion method offers high reproducibility and is suitable for fabrication of quasiphase-matching waveguide SHG devices. A prototype device was fabricated and SHG was demonstrated using a CW-YAG laser.