Abstract

A cw Nd:YAG laser was quasi-phase-matched frequency doubled by a bulk periodically poled flux-grown KTiOPO4 crystal in an external resonant cavity. The conversion efficiency and the second-harmonic power with a pump of 225  mW were 55% and 123.5  mW, respectively. The loss of the 1-cm-long crystal, which operated near room temperature, was 1.3% and was dominated by scatter from the cleaved facets of the crystal. No damage, photorefractive or other, was observed at intensites of 370 Wmm-2, but beam size had to be optimized to eliminate thermal-induced instabilities in the doubling cavity.

© 1998 Optical Society of America

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