Recent Advances In Erasable Phase-Change Optical Disks

Nobuo Akahira; Noboru Yamada; Kunio Kimura; Masatoshi Takao

doi:10.1117/12.944624

2 June 1988 Recent Advances In Erasable Phase-Change Optical Disks

Nobuo Akahira, Noboru Yamada, Kunio Kimura, Masatoshi Takao

Proceedings Volume 0899, Optical Storage Technology and Applications; (1988) https://doi.org/10.1117/12.944624
Event: 1988 Los Angeles Symposium: O-E/LASE '88, 1988, Los Angeles, CA, United States

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.

Citation Download Citation

Nobuo Akahira, Noboru Yamada, Kunio Kimura, and Masatoshi Takao "Recent Advances In Erasable Phase-Change Optical Disks", Proc. SPIE 0899, Optical Storage Technology and Applications, (2 June 1988); https://doi.org/10.1117/12.944624

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