Abstract
In this paper we report on the dispersion of the electrogyration of the sillenite crystals Bi12SiO20, Bi12GeO20, and Bi12TiO20 over the visible spectrum. We measure the electrogyration coefficient from the rotation of the polarization plane of the transmitted beam due to the externally applied electric field. Both light transmission and electric field direction are parallel to the [111] crystallographic direction in which the influence of the electrooptic effect is diminished. In all cases the electrogyratory coefficient is found to be between 0.5–3.75×10-13 m/V and has the same dispersion pattern like optical activity and refractive index.
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