The principal refractive indices and the thermal refractive-index coefficients of 7.5-mol.% Nb:KTiOPO4 crystal were measured by autocollimation for wavelengths of 0.53975, 0.6328, 1.0795, and 1.3414 µm from room temperature to 143 °C. The Sellmeier equations at room temperature were obtained and used to calculate the optimal phase-matched angles for 1.0642 and 1.0795 µm. The calculated and experimental values are in good agreement.
© 1999 Optical Society of America
Original Manuscript: February 26, 1998
Revised Manuscript: July 31, 1998
Published: February 20, 1999
Hongyuan Shen, Deyin Zhang, Wen Liu, Wenzhi Chen, Guofang Zhang, Ge Zhang, and Wenxiong Lin, "Measurement of refractive indices and thermal refractive-index coefficients of 7.5-mol.% Nb:KTiOPO4 crystal," Appl. Opt. 38, 987-990 (1999)