Accession Number : ADP006717

Title :   Fundamental Noise Limits in Photorefractive Systems,

Corporate Author : ROCKWELL INTERNATIONAL THOUSAND OAKS CA SCIENCE CENTER

Personal Author(s) : Vachss, Frederick ; Gu, Claire ; Hong, John ; Chang, Tallis

Report Date : 22 MAY 1992

Pagination or Media Count : 5

Abstract : When photorefractive materials are included as elements in image and signal processing systems, the dynamic range of the photorefractive element has a significant impact on the overall performance of the system. Evaluating the limits on this dynamic range is of particular importance if we hope to provide a realistic comparison of photorefractive devices such as spatial light modulators 1,2 or integrating correlators 3 with similar devices based on competing opto-electronic technologies. We must thus determine the range of signal beam intensities which may be used to write a holographic grating with a reference beam of some fixed intensity, or in other words, the maximum beam ratio that will cause a detectable refractive index grating to be written within the photorefractive material.

Descriptors :   *REFRACTION, *NOISE REDUCTION, COMPARISON, CORRELATORS, DYNAMIC RANGE, DYNAMICS, ELECTRONICS, IMAGES, IMPACT, INDEXES, INTENSITY, LIGHT, LIGHT MODULATORS, MATERIALS, MODULATORS, PROCESSING, RATIOS, REFRACTIVE INDEX, SIGNAL PROCESSING, SIGNALS, HOLOGRAMS, ELECTROOPTICS, IMAGE PROCESSING, LIGHT MODULATORS, GRATINGS(SPECTRA), SYMPOSIA.

Subject Categories : Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE