Bismuth Silicon Oxide (BSO) Bi₁₂SiO₂₀
Bismuth Germanium Oxide (BGO) Bi₁₂GeO₂₀

Sillenite type monocrystals Bi₁₂SiO₂₀ (BSO) and Bi₁₂GeO₂₀ (BGO) display unique combination of different physical properties. Crystals BSO and BGO are very efficient photoconductors with low dark conductivity. Strong spectral dependence of the photoconductivity allows to produce a wide range of optical device and systems. Combination of electro-optical and photoconductive properties display photorefractive effect (PR) in the crystals. BSO crystals are used like photoconductor in optically-addressed spatial light modulators (OASLM) and liquid crystal light valves (LCLV) with electro-optical modulation into liquid crystal medium. Both crystals BSO, BGO are used like electro-optic and photoconductive mediums for construction of PROM, PRIZ spatial modulators. Sillenite crystals are applied in dynamic real-time hologram recording devices, optical correlators, and optical laser systems for adaptive correction of ultra short light pulses. Photo-induced absorption in sillenite BTO films make possible to project a light-light type modulation. Production of sillenite thin-film crystal structures by different technologies permits the development of a long list of devices including optical waveguides, integrated optical devices. The use of waveguide optical structures based on sillenite crystals allows achieving uniform writing illumination in a wide spectral range. Crystals BSO, BGO are used in optical fiber electric/magnetic fields sensors.
 

Properties Crystal Bi12SiO20 (BSO) Bi12GeO20 (BGO) Crystal Structure cubic cubic Lattice Parameters, A 10.10 10.15 Transmission Range, mkm 0.4 – 6 0.4 – 7 Refractive Index at 633nm 2.54 2.55 Electro-Optic Coefficient r41, pm/V 5.0 3.5 Optical Activity, deg/mm at 633 nm 20.5 20.4 Density, g/cm3 9.15 9.2 Mohs Hardness 5 5 Melting Point, C 890 920 Dielectric Constant 56 40

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