Browse Prior Art Database

Laser Plate Storage

IP.com Disclosure Number: IPCOM000045554D
Original Publication Date: 1983-Apr-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 3 page(s) / 31K

Publishing Venue

IBM

Related People

Marks, RF: AUTHOR [+2]

Abstract

We have found that some thin films, such as Nb(2)0(3), can be selectively grown or removed in a controlled chemical environment by applying laser illumination of suitable intensity. This phenomenon could be used to form an optical information storage system having an erase capability.

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Laser Plate Storage

We have found that some thin films, such as Nb(2)0(3), can be selectively grown or removed in a controlled chemical environment by applying laser illumination of suitable intensity. This phenomenon could be used to form an optical information storage system having an erase capability.

The drawing illustrates a possible information storage system 10. Plate 12 is the storage medium. It could be a metal plate, for example. Laser 14 writes on plate 12 by selectively activating chemical growth of a film different from the plate composition. A suitable chemical atmosphere 16 inside of enclosure 18 provides writing material to form (or assist in forming) the written film. We have demonstrated, for example. that Nb oxidation can be selectively activated by laser beam irradiation of a Nb plate in the presence of oxygen. The writing material in this example is oxygen, which is provided by the gaseous environment if of the plate. Laser beam positioner 20 directs the laser beam such that it strikes the plate 12 at a desired location on the plate, i.e., addresses the storage location.

The laser can erase a given location, for example, by increasing the power delivered to a location. We have shown that we can remove Nb(2)O(3) from the surface of Nb in this way. Laser power density regulator 22 is used to control the power density for the write, erase, and read modes, all of which in general require different power densities.

A detector may be used to read stored information. Upon interaction with the plate surface, a reading laser beam in general causes emission of photons, electrons and ions, and generates excitations within the plate itself. The excitations and/or emitted particles can be sensed with a suitable detector and can be used to rea...