Photodichroic Materials as Coherent Optical Computing Elements
Abstract
Photodichroic materials have been used extensively as optical converters for recording and storage of binary, and gray scale imagery, as multiple volume hologram materials, and for phase modulation. The paper describes the use of the photodichroic properties of these materials and the dependence of their absorption on the polarization of the recording and reading light in several subtraction schemes: elimination of the on-axis wave in a Bragg hologram, subtraction of two images, subtraction of one hologram from a set of multiply stored ones, and the subtraction of constant background data and strong signals to enhance detection of weak signals. The utilization of NaF as an adaptive matched-spatial filter for pattern recognition is considered.
- Publication:
-
Real-Time Devices and Novel Techniques
- Pub Date:
- January 1976
- Bibcode:
- 1976SPIE...83...25C
- Keywords:
-
- Color Centers;
- Holography;
- Optical Data Storage Materials;
- Photochromism;
- Sodium Fluorides;
- Adaptive Filters;
- Computer Storage Devices;
- Crystal Optics;
- Image Converters;
- Imaging Techniques;
- Lithium Fluorides;
- Matched Filters;
- Optical Data Processing;
- Wave Front Reconstruction;
- Optics