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Proceedings Paper

New Thin-Film Optical Recording Medium
Author(s): Nicholas F. Borrelli; Peter L. Young
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Paper Abstract

The optical properties of a silver-halide based thin film material are described in terms of its possible use as a high-density, read-write-erasable, optical recording medium. Exposure of the initially optically isotropic film to polarized light in the wavelength region, 0.5-0.7μm induces dichroism and birefringence over a broad wavelength regime, 0.4-1.0μm. The film is essentially insensitive to exposure wavelength beyond 0.8μm. The optic axis of the induced anisotropy coincides with the polarization direction of the incident beam. The optic axis can be rotated to any new direction by re-exposure to a new polarization direction of the incident beam. The use of this material as a read-write-erasable recording medium is shown to be possible utilizing a polarized He-Ne laser as the write source and a GaAs (λ-0.82μm) laser as the read source. The reading mode is accomplished through the induced birefringence at 0.82pm where the film is insensitive to further bleaching. The erase mode is accomplished by re-exposing the recorded spot to a 45 or 90° rotation of the polarization direction of the write beam. Specific sensitivity data will be presented.

Paper Details

Date Published: 12 February 1980
PDF: 6 pages
Proc. SPIE 0200, Laser Recording and Information Handling, (12 February 1980); doi: 10.1117/12.958067
Show Author Affiliations
Nicholas F. Borrelli, Cornina Glass Works (United States)
Peter L. Young, Corning Glass Works (United States)

Published in SPIE Proceedings Vol. 0200:
Laser Recording and Information Handling
Albert A. Jamberdino, Editor(s)

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