Photorefractive crystals for real-time image processing

Ken Y. Hsu; Shiuan-Huei Lin; Tai Chiung Hsieh; LongJang Hu; T. S. Yeh; H. P. Lin; Chia-Hui Lin; S. L. Tu; Sheng-Jehn Yang; Shu-En Hsu

doi:10.1117/12.178619

28 April 1994 Photorefractive crystals for real-time image processing

Ken Y. Hsu, Shiuan-Huei Lin, Tai Chiung Hsieh, LongJang Hu, T. S. Yeh, H. P. Lin, Chia-Hui Lin, S. L. Tu, Sheng-Jehn Yang, Shu-En Hsu

Author Affiliations +

Proceedings Volume 10270, Photorefractive Materials, Effects, and Applications: A Critical Review; 102700D (1994) https://doi.org/10.1117/12.178619
Event: SPIE's 1993 International Symposium on Optics, Imaging, and Instrumentation, 1993, San Diego, CA, United States

Abstract

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: LiNb0₃ 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.

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Ken Y. Hsu, Shiuan-Huei Lin, Tai Chiung Hsieh, LongJang Hu, T. S. Yeh, H. P. Lin, Chia-Hui Lin, S. L. Tu, Sheng-Jehn Yang, and Shu-En Hsu "Photorefractive crystals for real-time image processing", Proc. SPIE 10270, Photorefractive Materials, Effects, and Applications: A Critical Review, 102700D (28 April 1994); https://doi.org/10.1117/12.178619

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