CORRELATION BETWEEN DIELECTRIC AND ELECTROOPTIC PROPERTIES RELATED TODOMAIN DYNAMICS IN RBHSEO4 CRYSTALS

The variations of the effective electro-optic coefficient and of the d ielectric permittivity as functions of the de electric field are repor ted in rubidium hydrogen selenate at room temperature. Their frequency dispersions are measured in the range 20 Hz-l MHz. The influence of t he ac field amplitude on these properties is also studied. It is shown that the dielectric and the electro-optic responses are strongly nonl inear with the amplitude of the ac electric field, and that their freq uency dispersions are closely linked to one another, up to the vicinit y of the piezoelectric resonances. The role of domain dynamics in the dielectric and electro-optic properties is stressed. The domain contri bution to the electro-optic response is explained by means of a simple model based on the tilt of the optical indicatrix in neighboring doma ins. [S0163-1829(98)02629-0].