The indices of refraction, thermal variations of refractive indices, and thermal expansion coefficients were measured for the gadolinium garnets Gd<sub>3</sub>Sc<sub>2</sub>Ga<sub>3</sub>O<sub>12</sub> (GSGG) and Gd<sub>3</sub>Sc<sub>2</sub>Al<sub>3</sub>O<sub>12</sub>. The variation of these properties with trivalent chromium doping was investigated for GSGG. Therefractive indices were determined by the minimumdeviation technique, with indices fitted to a five-parameter Sellmeier formula. The thermal coefficients were measured by an interferometric technique using simultaneous Twyman–Green and Fizeau interferometry.
© 1988 Optical Society of America
C. S. Hoefer, K. W. Kirby, and L. G. DeShazert, "Thermo-optic properties of gadolinium garnet laser crystals," J. Opt. Soc. Am. B 5, 2327-2332 (1988)