New Thin-Film Optical Recording Medium

Nicholas F. Borrelli; Peter L. Young

doi:10.1117/12.958067

12 February 1980 New Thin-Film Optical Recording Medium

Nicholas F. Borrelli, Peter L. Young

Proceedings Volume 0200, Laser Recording and Information Handling; (1980) https://doi.org/10.1117/12.958067
Event: 23rd Annual Technical Symposium, 1979, San Diego, United States

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.

Citation Download Citation

Nicholas F. Borrelli and Peter L. Young "New Thin-Film Optical Recording Medium", Proc. SPIE 0200, Laser Recording and Information Handling, (12 February 1980); https://doi.org/10.1117/12.958067

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