Almaz Optics, Inc.
Sillenite Crystals, BGO/BSO/BTO
|Photorefraction is an effect of
refractive index variation in the material exposed to the light. This
property makes it possible to create spatial distribution of refractive
index in the crystal and can be used in wide variety of devices
including spatial light modulators, optical memory, holography, phase
Most popular photorefractive materials are crystals of Sillenite structure Bi12MO20
(M = Si, Ge, Ti). These crystals have fortunate combination of photorefractive, electrooptic and other properties making it promising materials for optoelectronics.
1. If not specified, optical properties are given for wavelength 633 nm.
elements are available in sizes (3–20)x(3–20)x(3–20) mm3. Wafers
with diameter up to 40 mm, or 30x30 mm square, 0.5 - 5.0 mm thick are
available. Orientation: Standard  cut or other on request.
standard: 20/10 S/D, lambda/4 flatness, parallelism < 2’
available photorefractive crystals:
absorption increases under illumination of crystal e.g. by sunlight.