Browse Prior Art Database

Holographic Information Storage Systems

IP.com Disclosure Number: IPCOM000076595D
Original Publication Date: 1972-Mar-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

McDonnell, JA: AUTHOR

Abstract

The drawing shows a holographic storage system, employing reversible media as the principle means for imaging and storing digital or analog information. The system user a hologram having a Curie point mechanism, which is responsive to a magnetic field for erasing information stored therein. Writing and reading functions are performed by appropriate radiation frequencies.

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Holographic Information Storage Systems

The drawing shows a holographic storage system, employing reversible media as the principle means for imaging and storing digital or analog information. The system user a hologram having a Curie point mechanism, which is responsive to a magnetic field for erasing information stored therein. Writing and reading functions are performed by appropriate radiation frequencies.

A system is shown in which a transmissive mode of imaging is employed Write laser 20 generates a beam of radiation at a frequency which is absorbed by the magneto-optic molecule of a hologram, causing the temperature of the material to be raised to the Curie point where the material reverts to its original state by losing its magnetic state.

When a read operation is desired, read laser 21 generates a beam of coherent radiation at a radiation frequency which is transmittable by the magneto-optic molecules of a hologram, thus causing no change in the magnetic alignment of the molecules.

A selected hologram 25 is erased of information by selecting and energizing an appropriate pair of coordinate matrix lines, which energize a magnetic erase element to cause complete magnetization in the selected hologram. The system is then prepared for a write operation by setting information in image plate 24c. This is accomplished by activating appropriate diodes in light-emitting diode array 24a, to correspond to coded information desired to be set into image plate 24c. The lig...