An rf-sputtered thin film of LiNbO3 on a sapphire substrate was used as a waveguide for optical frequency doubling. Employing a Nd:YAG laser and a tunable dye laser, whose output was used to pump a stimulated Raman cell, the TMω0 → TM2ω2 up-conversion process was investigated in detail, and the phase-matched nature of this process was demonstrated. The conversion efficiency was estimated to be about 10−3.
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Hewig et al. (1983) studied this question.
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