We report what is to our knowledge the first demonstration of a continuous-wave optical parametric oscillator (OPO) based on periodically poled KTiOPO<sub>4</sub> . The 10-mm-long flux-grown crystal had a quasi-phase-matched period of 9μm . The pump source was a miniature frequency-doubled Nd:YAG laser, and the threshold power of this doubly resonant device was 51 mW. The OPO was operated near room temperature. The signal and the idler wavelengths could be tuned in the range 1037–1093 nm by variation of the crystal temperature (32–38°C) and the cavity length. Unlike in other nonlinear crystals, green-induced infrared absorption was not observed up to the highest pumping intensity of ≈4.5kW/cm<sup>2</sup> .
© 1998 Optical Society of America
(190.0190) Nonlinear optics : Nonlinear optics
(190.2620) Nonlinear optics : Harmonic generation and mixing
(190.4970) Nonlinear optics : Parametric oscillators and amplifiers
(230.4320) Optical devices : Nonlinear optical devices
A. Garashi, A. Arie, A. Skliar, and G. Rosenman, "Continuous-wave optical parametric oscillator based on periodically poled KTiOPO4," Opt. Lett. 23, 1739-1741 (1998)