Growth and optical properties of Na3Gd2(BO3)3 crystal

Abstract A Na3Gd2(BO3)3 (NGBO) crystal with dimensions of 25 × 15 × 10 mm3 has been successfully grown by the top-seeded solution growth method with a [0 1 1] orientation seed at the molar ratio of NGBO:NaBO2:NaF = 1:2:1. Transmission spectrum shows that NGBO is optically transparent in a wide range from 320 nm to 3000 nm. The refractive indices were accurately measured by the minimum deviation method at twelve different wavelengths from 0.363 to 2.325 μm and the Sellmeier equations constructed. The nonlinear optical coefficients were determined with the Maker fringe technique, which gave results of d31 = 2.35 pm/V, d32 = 0.51 pm/V, d33 = 1.33 pm/V.