We have obtained 6.5 W of 2-µm output from a near-degenerate, type II KTiOPO4 (KTP) optical parametric oscillator (OPO) pumped within the cavity of a Q-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 Q 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
Original Manuscript: April 29, 1999
Revised Manuscript: December 21, 1999
Published: March 20, 2000
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)