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 W mm-2, but beam size had to be optimized to eliminate thermal-induced instabilities in the doubling cavity.
Original language | English |
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Pages (from-to) | 28-30 |
Number of pages | 3 |
Journal | Optics Letters |
Volume | 23 |
Issue number | 1 |
DOIs | |
State | Published - 1 Jan 1998 |