EFFICIENT ND-YAG LASER FREQUENCY-DOUBLING WITH PERIODICALLY POLED KTP

Periodically poled flux-grown KTiOPO4 was used for efficient extracavi ty 1064-nm Nd:YAG laser frequency doubling. A conversion efficiency ex ceeding 65% was obtained in Q-switched operation, and 1.34 W of averag e frequency-doubled power was generated with 2.2 W of mode-locked lase r output, The conversion efficiency is approximately two times higher for periodically poled KTP than for conventional type II phase-matched KTP. The measurements indicate that periodically poled KTP is less su sceptible to optical damage than type II KTP. (C) 1998 Optical Society of America.