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Proceedings Paper

New Optical Erasable Medium Using Tellurium Suboxide Thin Film
Author(s): Mutsuo Takenaga; Noboru Yamada; Shunji Ohara; Kenichi Nishiuchi; Michiyoshi Nagashima; Toshiaki Kashihara; Suguru Nakamura; Tadaoki Yamashita
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Paper Abstract

A suboxide thin film of TeOx ( x is smaller than the stoich.Lometric value ) containing a small amount of additives of such metals and semimetals as Sn and Ge has been found to have the property of showing a reversible change in its optical constants when the film was exposed in turn to two diode laser spots with different sizes, and this property can be utilized for an erasable disc. For recording, a TeOx thin film deposited on a PMMA substrate is irradiated by a diffraction limited laser spot, 0.8 pm in dia., modulated in response to an input electrical signal. This causes a micro-sized area of the film to be suddenly heated and rapidly quenched, resulting in a decrease in optical reflectivity. This recorded bit can be erased at real time by the irradiation of a diffused laser spot to an elliptical shape, 1 x 10 pm, by which the bit recovers its optical properties. An optical head having the two laser beams, one for recording/playback and one for erasing, has been developed. Real time erasing and recording at the same time has been achieved for a video signal. In excess of a million record/erase cycles have been demonstrated with no significant degradation in playback signal quality or erasability. Carrier-to-noise ratio, C/N, was more than 55 dB at 5 MHz, 30 kHz bandwidth.

Paper Details

Date Published: 10 November 1983
PDF: 5 pages
Proc. SPIE 0420, Optical Storage Media, (10 November 1983); doi: 10.1117/12.936065
Show Author Affiliations
Mutsuo Takenaga, Matsushita Electric Industrial Co. (Japan)
Noboru Yamada, Matsushita Electric Industrial Co. (Japan)
Shunji Ohara, Matsushita Electric Industrial Co. (Japan)
Kenichi Nishiuchi, Matsushita Electric Industrial Co. (Japan)
Michiyoshi Nagashima, Matsushita Electric Industrial Co. (Japan)
Toshiaki Kashihara, Matsushita Electric Industrial Co. (Japan)
Suguru Nakamura, Matsushita Electric Industrial Co. (Japan)
Tadaoki Yamashita, Matsushita Electric Industrial Co. (Japan)

Published in SPIE Proceedings Vol. 0420:
Optical Storage Media
Alan E. Bell; Albert A. Jamberdino, Editor(s)

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