Heavily iron doped lithium niobate photorefractive crystals are grown and characterized. The crystals have high diffraction efficiency and fast temporal response and hence are suitable for real-time image processing. Three applications of thin Fe: LiNbO 3 plates are demonstrated: the joint-transform correlator, the optical perception, and the hybrid image classifier. In the first and third systems, the heavily doped (0.5% mole) crystals are used. These crystals have fast temporal response (300-400 msec) and thus provide a means for real time optical processing. In the second system, a slightly light doped (0.1% mole) crystal is used. It has relatively long (> 1 minute) response time and is used for recording the dynamic memory in a neural network. Image recognition by these three systems are presented.
|Number of pages||17|
|Journal||Proceedings of SPIE - The International Society for Optical Engineering|
|State||Published - 28 Apr 1994|
|Event||Photorefractive Materials, Effects, and Applications: A Critical Review 1993 - San Diego, United States|
Duration: 11 Jul 1993 → 16 Jul 1993