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Proceedings Paper

Effect of laser pulse width on overwrite cycle characteristics of phase-change disk media
Author(s): Takeo Ohta; Kazuo Inoue; Tetsuya Akiyama; Kazumi Yoshioka
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Paper Abstract

It is found that an equivalent temperature profile and mark size produces one million cycle stable overwrite characteristics. The linear velocity at constant angular velocity (CAV) disk rotation mode varies by a factor of two between the outermost track and the innermost track. Varying the laser pulse width can achieve an equivalent mark formation process at both inner and outer track positions. The configuration of the phase change disk media features a quadrilayer rapid cooling structure. Our disk has a new structure, consisting of a dielectric layer combination of a ZnS-SiO2 mixture layer and an SiO2 layer. The equivalent thermal profile was determined using a heating and cooling process simulation method. A large pulse width of 70 ns on the inner track gives the equivalent temperature profile of a smaller 50 ns pulse width on the outer track. This method produces million-cycle-overwrite characteristics through the whole linear velocity range on the disk in a large capacity MCAV system.

Paper Details

Date Published: 13 August 1992
PDF: 7 pages
Proc. SPIE 1663, Optical Data Storage, (13 August 1992); doi: 10.1117/12.137573
Show Author Affiliations
Takeo Ohta, Matsushita Electric Industrial Co., Ltd. (Japan)
Kazuo Inoue, Matsushita Electric Industrial Co., Ltd. (Japan)
Tetsuya Akiyama, Matsushita Electric Industrial Co., Ltd. (Japan)
Kazumi Yoshioka, Matsushita Electric Industrial Co., Ltd. (Japan)

Published in SPIE Proceedings Vol. 1663:
Optical Data Storage
Donald B. Carlin; David B. Kay; Alfred A. Franken, Editor(s)

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