Phase-change recording media of 20-GB capacity for system with 0.6-mm-thick substrate

Noritake Ohmachi; Akihito Ogawa; Naoki Morishita; Naomasa Nakamura; Keiichiro Yusu; Sumio Ashida; Takayuki Tsukamoto; Katsutaro Ichihara

doi:10.1117/12.532417

16 September 2003 Phase-change recording media of 20-GB capacity for system with 0.6-mm-thick substrate

Noritake Ohmachi, Akihito Ogawa, Naoki Morishita, Naomasa Nakamura, Keiichiro Yusu, Sumio Ashida, Takayuki Tsukamoto, Katsutaro Ichihara

Author Affiliations +

Proceedings Volume 5069, Optical Data Storage 2003; (2003) https://doi.org/10.1117/12.532417
Event: Optical Data Storage 2003, 2003, Vancouver, Canada

Abstract

We have developed phase change media of 20GB user data capacity for the next generation optical recording system using a blue-violet laser diode with the wavelength of 405nm. An objective lens with the numerical aperture of 0.65 has been used along with mm-thick substrates on which the laser is incident. We have employed the land and groove recording. A transparent film with high thermal conductivity has been adopted at the light incident side of the recording layer in order to improve the carrier to noise ratio and the erase ratio as well as to reduce the cross-erase. Bottom channel bit error rate of less than 1×10^-6 has been obtained and its wide tilt margins have successfully demonstrated the strong feasibility for the next generation rewritable system.

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Noritake Ohmachi, Akihito Ogawa, Naoki Morishita, Naomasa Nakamura, Keiichiro Yusu, Sumio Ashida, Takayuki Tsukamoto, and Katsutaro Ichihara "Phase-change recording media of 20-GB capacity for system with 0.6-mm-thick substrate", Proc. SPIE 5069, Optical Data Storage 2003, (16 September 2003); https://doi.org/10.1117/12.532417

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