Abstract
Abstract A model for the poling process of Zn diffused LiTaO3 optical waveguides that is based on the thermodynamic theory of ferroelectrics is presented. The effect of oppositely oriented domain regions are related to the linear electrooptic coefficient by the approximation that the polarization inside the crystal is proportional to the external electric field applied during poling. The model predictions agree well with experimental optical phase shift data of electrooptic waveguide modulators produced by diffusions above the Curie temperature then repoled under different electric field values.
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