We have obtained 6.5 W of 2-μm output from a near-degenerate, type II KTiOPO<sub>4</sub> (KTP) optical parametric oscillator (OPO) pumped within the cavity of a <i>Q</i>-switched diode-pumped Nd:YAG laser that operates at 3 kHz. We adopted the simplest configuration with a compact diode-pumped Nd:YAG module pumping the doubly resonant KTP OPO in its randomly polarized resonator with an acousto-optic <i>Q</i> switch. Attempts to increase the 2-μm output power by pumping this intracavity KTP OPO with a polarized laser beam by use of thermal birefringence compensation configurations are discussed.
© 2000 Optical Society of America
Poh Boon Phua, Kin Seng Lai, and Ruifen Wu, "Multiwatt High-Repetition-Rate 2-µm Output from an Intracavity KTiOPO4 Optical Parametric Oscillator," Appl. Opt. 39, 1435-1439 (2000)