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Proceedings Paper

Recent Advances In Erasable Phase-Change Optical Disks
Author(s): Nobuo Akahira; Noboru Yamada; Kunio Kimura; Masatoshi Takao
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Paper Abstract

Our recent studies of phase-change type erasable optical disk are reviewed. Two types of disk systems have been developed. The first one is a inherent overwrite system using single circular shaped laser beam. The recording materials for this case are Te-Ge-Sb ternary compositions corresponding to the stoichiometric compounds. They showed remarkable short switching time of less than 100 ns. The second type is a dual laser beam system for simultaneous erase/record in the single pass. One laser beam is circular shaped for both recording and reading. The other is elliptical shaped for erasing. The recording materials of Ge-Sb-Te-Se quaternary alloy, for this case, showed rather long erasing time about 500 ns but high sensitivity. The shape of erasing beam was modified for a successive thermal process of a homogenizing melt and a crystallizing anneal of the recording layer. The obtained erasability was less than -45dB, whilst it was about -30dB for the ordinary elongated beam by only annealing without melting.

Paper Details

Date Published: 2 June 1988
PDF: 8 pages
Proc. SPIE 0899, Optical Storage Technology and Applications, (2 June 1988); doi: 10.1117/12.944624
Show Author Affiliations
Nobuo Akahira, Matsushita Electric Industrial Co. (Japan)
Noboru Yamada, Matsushita Electric Industrial Co. (Japan)
Kunio Kimura, Matsushita Electric Industrial Co. (Japan)
Masatoshi Takao, Matsushita Electric Industrial Co. (Japan)


Published in SPIE Proceedings Vol. 0899:
Optical Storage Technology and Applications
Donald B. Carlin; Albert A. Jamberdino; Yoshito Tsunoda, Editor(s)

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