Crystal Research, Inc. (CRI), founded in 2001, is a small technology inventor. We conduct
research in the area of optics, photonics, holography, and electronics.
CRI's Ultra Thick Transmission Gratings (UTG) products 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.
Another CRI's technology is Electro-Optic Holograms (EOH), which 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 the EOH can be
electrically adjusted over a continuous range from essentially zero to near 100% at very
fast switching speed.
CRI produces many unique Electro-Optic Crystals (KTN) that shows the largest
electro-optic effect ever reported. KTN is transparent optical crystal composed of
potassium, tantalum, niobium, and oxygen. The first KTN crystal was synthesized in the
1950's and is well known as a crystal with a very large quadratic electro-optic coefficient,
which is 20 times larger than that of conventional LiNbO3. In addition, KTN crystals are