Browse Prior Art Database

Lensless Beam Addressable Memory using Room Temperature Lasers

IP.com Disclosure Number: IPCOM000080487D
Original Publication Date: 1973-Dec-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Wieder, H: AUTHOR

Abstract

Beam-addressable reading and recording storage systems require lightbeam systems which affect the physical properties of a system, or are themselves affected by the physical properties of the storage medium. Conventional systems utilize a fixed light source such as a laser, focusing optics to achieve high resolution, and deflector means for moving the beam across the surface. Information is read by the effect upon the beam either in transmission or in reflection by, for example, Kerr or Faraday effects in the case of polarization rotation of a light beam by a magnetic storage medium. High resolution in such a system puts stringent requirements on the flatness of the recording medium, since the depth of focus of high-resolution optics is small.

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Lensless Beam Addressable Memory using Room Temperature Lasers

Beam-addressable reading and recording storage systems require lightbeam systems which affect the physical properties of a system, or are themselves affected by the physical properties of the storage medium. Conventional systems utilize a fixed light source such as a laser, focusing optics to achieve high resolution, and deflector means for moving the beam across the surface. Information is read by the effect upon the beam either in transmission or in reflection by, for example, Kerr or Faraday effects in the case of polarization rotation of a light beam by a magnetic storage medium. High resolution in such a system puts stringent requirements on the flatness of the recording medium, since the depth of focus of high-resolution optics is small.

The assembly described herein provides high-resolution recording and readout, while avoiding the depth-of-focus problem of a conventional beam- addressed system. It also eliminates optics and deflection elements entirely, thereby simplifying the structure. The assembly has a junction laser for providing optical transducer operation, the junction laser, in turn, is secured to a slider assembly which is adapted to fly relative to a record medium to effect the reading and/or writing operation. The junction laser may be of the homojunction or heterojunction type, of a material consisting of gallium arsenide, gallium phosphide, indium arsenide, or gallium aluminum ar...