Periodically poled flux-grown KTiOPO<sub>4</sub> was used for efficient extracavity 1064-nm Nd:YAG laser frequency doubling. A conversion efficiency exceeding 65% was obtained in <i>Q</i>-switched operation, and 1.34 W of average frequency-doubled power was generated with 2.2 W of mode-locked laser 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 susceptible to optical damage than type II KTP.
© 1998 Optical Society of America
Valdas Pasiskevicius, Shunhua Wang, Jens A. Tellefsen, Fredrik Laurell, and Håkan Karlsson, "Efficient Nd:YAG Laser Frequency Doubling with Periodically Poled KTP," Appl. Opt. 37, 7116-7119 (1998)