We demonstrate that the threshold for a mid-IR optical parametric oscillator based on periodically poled LiNbO<sub>3</sub> is significantly reduced by the introduction of an optical amplifier inside the cavity. Thresholds as low as 8 mW and a tuning range of 3.0–4.2µm were attained for stable single-mode operation.
© 2003 Optical Society of America
(190.4410) Nonlinear optics : Nonlinear optics, parametric processes
(190.4970) Nonlinear optics : Parametric oscillators and amplifiers
(190.7110) Nonlinear optics : Ultrafast nonlinear optics
Ioulia B. Zotova, Yujie J. Ding, Xiaodong Mu, and Jacob B. Khurgin, "Reductions of threshold for a mid-infrared optical parametric oscillator by an intracavity optical amplifier," Opt. Lett. 28, 552-554 (2003)