Abstract: Staring with the expressions of dielectric tensor, and using appropriate models to simplify these microscopic expressions, the calculated formulas of the Faraday rotation (θ_F) and the optic absorption coefficient (α) were obtained. The theoretic model of Bi-YIG magnetooptic properties and the pararnetric data-base were established. On the basis of above works, the system of computer aided design of Bi- YIG magnetooptic properties was developed, and the results were in good agreement with the experiment.

Key words: Bi-YIG film materials, magnetooptic properties, computer aided design