Abstract

The photorefractive materials Bi₁₂SiO₂₀ (BSO) and Bi₁₂GeO₂₀ (BGO) are among the most sensitive for reversible volume holographic recording [1]. The band transport model in conjunction with a simple two energy level diagram is commonly used to describe grating formation [2]. The recording light excites electrons from an energy level A located at 2.6 eV below the conduction band to this latter [3]. The free photoelectrons drift under the action of an applied electric field from illuminated to unilluminated zones where they remain trapped at a level B 1.3 eV below the conduction band.

© 1987 Optical Society of America