KNbO<sub>3</sub> has been found to be phase matchable for type 1 second-harmonic generation up to 2.4 μm at 22 °C. The improved Sellmeier equations that correctly reproduce the nonlinear experiments thus far reported in the literature and our new experimental results for harmonic generation of CO<sub>2</sub> laser harmonics between 3.5303 and 5.2955 μm are presented.
© 1999 Optical Society of America
(140.3470) Lasers and laser optics : Lasers, carbon dioxide
(160.4760) Materials : Optical properties
(190.2620) Nonlinear optics : Harmonic generation and mixing
(190.4400) Nonlinear optics : Nonlinear optics, materials
Nobuhiro Umemura, Kunio Yoshida, and Kiyoshi Kato, "Phase-Matching Properties of KNbO3 in the Mid-Infrared," Appl. Opt. 38, 991-994 (1999)