Refractive indices and electro-optic coefficients of the eulitities Bi4Ge3O12 and Bi4Si3O12

Measurements are reported on the refractive index n and of the static electro-optic coefficient r41 as a function of wavelength throughout the visible for Bi4Ge3O12 and Bi4Si3O12. Both materials exhibit large dispersion. At 633 nm, n=2.0975 for the germanate and 2.0211 for the silicate. The corresponding values for r41 are 0.95×10−10 cm/V and 0.54×10−10 cm/V, respectively.