Accession Number : ADP006728

Title :   Diffraction Efficiency Dynamics in Photorefractive Crystals,

Corporate Author : COLORADO UNIV AT BOULDER DEPT OF ELECTRICAL AND COMPUTER ENGINEERING

Personal Author(s) : Maniloff, Eric S. ; Johnson, Kristina M.

Report Date : 22 MAY 1992

Pagination or Media Count : 4

Abstract : Due to their large potential storage capacity, photorefractive crystals are an attractive medium for a variety of optical computing architectures. The actual capacity of such storage systems is determined by the minimum acceptable diffraction efficiency for a given system design and the maximum number of holograms that can be recorded with this efficiency in photorefractive crystals. If the intensity fringes that are responsible for recording the hologram are assumed to be static in both crystal thickness and time, an analytic expression for the temporal dynamics of the index can be obtained. If this index variation is then used in the coupled wave equations, an analytic expression for the diffraction efficiency dynamics is obtained. However, according to the coupled wave equations, the recording fringes are only static in both modulation and phase for local response (grating phase equal to 0) and unity modulation depth. This approach is therefore self-consistent only for this specific case.

Descriptors :   *CRYSTALS, *OPTICAL STORAGE, DEPTH, DIFFRACTION, DYNAMICS, EFFICIENCY, HOLOGRAMS, INTENSITY, MODULATION, PHASE, STORAGE, THICKNESS, VARIATIONS, WAVE EQUATIONS, COMPUTER ARCHITECTURE, REFRACTION, SYMPOSIA.

Subject Categories : Optics
      Computer Hardware

Distribution Statement : APPROVED FOR PUBLIC RELEASE