Photorefractive real-time processing

Phase Materials. Phase holograms can be recorded in a large variety of materials, the most popular of which are dichromated gelatin, photopolymers, thermoplastic materials, and photorefractive crystals. Dichromated gelatin and some photopolymers require wet processing, and thermoplastic materials require heat processing. Photorefractive crystals are unique in that they are considered to be real-time materials and require no after-exposure processing. [Pg.160]

Optical Devices. Of most interest in this application are those studies related to the nonlinear optical effects in polyphosphazene derivatives bearing aromatic azo imits (217-219) and the photorefractive effect with pol5q)hosp-hazenes bearing carbazolyl substituents (220). Possible applications include optical switches, frequency doublers for lasers, holographic data storage, and real-time image processing. [Pg.6528]

Optical materials with large nonlinear indices of refraction and fast response times are essential components in any optical data processing scheme. Photorefractive materials have demonstrated the possibility of exhibiting large index changes at modest intensities 1114. In addition. they seem to be ideally suited for real-time holographic applications. These materials exhibit a light-in-... [Pg.736]