Measurement of refractive indices in the spectral bands 9–11 μm and 1.32 μm from a cw CO<sub>2</sub> laser and a <i>Q</i>-switched Nd:YAG laser, respectively, is reported in a ZnGeP<sub>2</sub> crystal. A new set of Sellmeier dispersion relations has been derived from the measured refractive indices data in this crystal. Second-harmonic generation (SHG) of CO<sub>2</sub> laser radiation in this crystal is also reported. It is also seen that the previously reported phase-matching data for others experiments in SHG and optical parametric devices is explained satisfactorily with this new set of Sellmeier dispersion relation.
© 2003 Optical Society of America
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(160.4330) Materials : Nonlinear optical materials
(190.2620) Nonlinear optics : Harmonic generation and mixing
(190.4360) Nonlinear optics : Nonlinear optics, devices
(190.4410) Nonlinear optics : Nonlinear optics, parametric processes
Subhasis Das, Gopal C. Bhar, Sudipto Gangopadhyay, and Chittaranjan Ghosh, "Linear and Nonlinear Optical Properties of ZnGeP2 Crystal for Infrared Laser Device Applications: Revisited," Appl. Opt. 42, 4335-4340 (2003)