Abstract
One group of promising photorefractive materials is the sillenites, which include Bi12SiO20 (BSO), Bi12GeO20 (BGO) and Bi12TiO20 (BTO). These materials are cubic, noncentrosymmetric and optically active. Although BTO shares a common structure with BSO and BGO, it has several advantages over the latter materials for photorefractive applications, including smaller optical activity, larger electro-optic coefficient and improved sensitivity in the red spectral region.1
© 1990 Optical Society of America
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