Crystal Research, Inc. (CRI), founded in 2001, is a small technology inventor. We conduct
research in the area of optics, photonics, holography, and electronics.
Ultra Thick Transmission Gratings (UTG) provide a new grating platform technology for
many important applications. Our UTG technology is based on a proprietary polymer
composite that has a refractive index modulation within the volume of the material. Unlike
conventional phase gratings in dichromated gelatin (DCG), ultra thick gratings can be
made with thickness from 3 microns to 3 minimeters in excellent optical transparency.
UTG can be polarization insensitive suitable for many fiber-optic applications. UTG exhibits
high diffraction efficiency, low wavefront distortion, low optical scattering. UTG, packaged
between two integrated glass plates, is extremely durable and easy to handle.
Electro-Optic Holograms (EOH) can be electrically switched on-and-off through electro-
optic effect. These holograms are formed by recording volume phase grating or hologram in
a polymer dispersed liquid crystal mixture. Unlike other conventional passive gratings, the
diffraction efficiency of electro-optic holograms can be electrically adjusted over a
continuous range from essentially zero to near 100% at very fast switching speed of 35
Electro-Optic Crystals (KTN and SBN) have the largest electro-optic effect ever reported.
KTN crystal is well known as an electro-optic crystal with a very large quadratic electro-
optic coefficient, which is 20 times larger than that of conventional LiNbO3.