Investigation of a Photodichroic Material for Holographic Storage and Recovery.
Abstract
The effect of impurities on the formation of color centers in the photodichroic crystals of sodium fluoride and on the fatigue of the write/read cycles has been examined. The results of this effort suggest that lithium ion implantation is the only satisfactory method for producing controllable color center depth with optimum fluence. There is now a need to determine the optimum ion for implantation in potassium chloride and other alkali halides that are candidates for information storage. Controlled depth of color centers is essential to maintain satisfactory resolution with high orders of minification. A unique procedure was developed giving major improvements in effective writing sensitivity. This procedure, which uses a readout system with crossed polarizers, gives high contrast, high resolution images and also permits the photodichroic alkali halide to be used as the storage medium in an incoherent/coherent processor. (Modified author abstract)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1974
- Accession Number
- AD0785274
Entities
People
- Matt Lehmann
- R. A. Armistead
Organizations
- SRI International