Abstract
Optical scattering is generally very significant in polycrystalline ceramics. Basically, two types of scattering occur in ceramics: Mie scattering caused by residual pores and Rayleigh scattering at the grain boundary regions due to dislocations. In this article, we discuss the relationship between the scattering and the microstructure of ceramics and describe the current state and the future of optical ceramics including its theory. Based on the expertise obtained in the development of ceramics lasers, we also synthesized advanced ceramic Faraday rotator materials, TYO and YIG ceramics, whose conventional synthesis is considered impossible. Furthermore, the principle for producing cubic and anisotropic crystals by the sintering method and some synthesis examples is also reported.
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