The principal refractive indices and the thermal coefficients for a LiNbO3 crystal doped with 5 mol. % MgO have been measured by a minimum-deviation method for the wavelengths of 0.53975, 0.6328, 1.0795, and 1.3414, μm in the temperature range 20–154.5°C. The constants of modified Sellmeier equations are all given in the described temperature range. The measured results were used to calculate the type I critical phase-matching angles for 1.0795- and 1.3414-μm second-harmonic generation at room temperature and the noncritical phase-matching temperature for 1.0795-μm second-harmonic generation for LiNbO3 crystal doped with 5 mol. % MgO. The values obtained agree well with the experimental results.
© 1992 Optical Society of America
Original Manuscript: December 10, 1991
Published: November 1, 1992
H. Y. Shen, H. Xu, Z. D. Zeng, W. X. Lin, R. F. Wu, and G. F. Xu, "Measurement of refractive indices and thermal refractive-index coefficients of LiNbO3 crystal doped with 5 mol. % MgO," Appl. Opt. 31, 6695-6697 (1992)