New Optical Erasable Medium Using Tellurium Suboxide Thin Film

Mutsuo Takenaga; Noboru Yamada; Shunji Ohara; Kenichi Nishiuchi; Michiyoshi Nagashima; Toshiaki Kashihara; Suguru Nakamura; Tadaoki Yamashita

doi:10.1117/12.936065

10 November 1983 New Optical Erasable Medium Using Tellurium Suboxide Thin Film

Mutsuo Takenaga, Noboru Yamada, Shunji Ohara, Kenichi Nishiuchi, Michiyoshi Nagashima, Toshiaki Kashihara, Suguru Nakamura, Tadaoki Yamashita

Author Affiliations +

Proceedings Volume 0420, Optical Storage Media; (1983) https://doi.org/10.1117/12.936065
Event: 1983 Optical Mass Data Storage Conferences, 1983, Arlington, United States

Abstract

A suboxide thin film of TeO_x ( 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 TeO_x 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.

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Mutsuo Takenaga, Noboru Yamada, Shunji Ohara, Kenichi Nishiuchi, Michiyoshi Nagashima, Toshiaki Kashihara, Suguru Nakamura, and Tadaoki Yamashita "New Optical Erasable Medium Using Tellurium Suboxide Thin Film", Proc. SPIE 0420, Optical Storage Media, (10 November 1983); https://doi.org/10.1117/12.936065

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