Optical properties of tetragonal Pb(Mg1/3Nb2/3)0.62Ti0.38O3 single crystal

Abstract

A systematic study of the optical properties of tetragonal Pb(Mg1/3Nb2/3)0.62Ti0.38O3 single crystals was calculated out at room temperature. It was found that the crystal is transparent in the visible region and rolls off in near 450 nm. The optical absorption edge is around 400 nm under both unpoled and poled conditions. The refractive indices and their dispersion were accurately measured with the minimum deviation method. The parameters Ai, Bi, Ci, and Di of Sellmeier’s equation for both no and ne are also obtained in terms of least-squares fit. Then, the refractive indices in the wavelength range of 435.8–3100 nm can be calculated. Using the Senarmont compensator method, the effective electro-optic coefficient rc=42.8 pm/V was also obtained. Some discussions about the octahedral BO6 structure are presented on the optical properties of the material.