Abstract
The electro‐optic effects in the optically active 23 class compounds Bi12TiO20 (BTIO) and Bi40Ga2O63 (BGAO) have been investigated. Measurements were made of the electro‐optic and electrogyration coefficients using longitudinal and transverse modes. Novel techniques employing a servo‐driven Soleil compensator were used to obtain these coefficients. A value of η=17×10−12 rad m/V was obtained for the electrogyratory coefficient in the BTIO compound.