Browse Prior Art Database

Real Time Optical Data Processor

IP.com Disclosure Number: IPCOM000090888D
Original Publication Date: 1969-Aug-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Spiller, EA: AUTHOR

Abstract

In optical data processing systems, the photographic plate is employed as the link between several optical fields, i.e., a complex filter is produced by recording a diffraction pattern of a first object on a photographic plate and, after developing, the information is processed further by illuminating it with a secondary beam. Because the photographic plate can be used only once and because there is a time delay of at least several minutes between write-in and read out, the practical application of optical data processing is restricted.

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Real Time Optical Data Processor

In optical data processing systems, the photographic plate is employed as the link between several optical fields, i.e., a complex filter is produced by recording a diffraction pattern of a first object on a photographic plate and, after developing, the information is processed further by illuminating it with a secondary beam. Because the photographic plate can be used only once and because there is a time delay of at least several minutes between write-in and read out, the practical application of optical data processing is restricted.

In this processor, real-time optical data processing and the connection of several optical systems to a larger system can be achieved if a light beam can be diffracted at an interference pattern produced by another system. To effect this, nonlinear optical material is used. If the absorption or refraction index of a material changes with light intensity, a diffraction pattern in the material can modulate another light beam as it does a photographic plate.

In "Image Processing with Nonlinear Optics", page 109 of the Proceedings of the Symposium on Modern Optics, Polytechnic Institute of Brooklyn, March 1967, there is described an arrangement for producing a transitory hologram. In this processor, such hologram is modulated with a second beam. A parallel laser beam is subjected to the action of beam splitters BS1 and BS2. One of the beams produced by splitter BS2 is the reference beam, the other beam...