Sub-Oxide Thin Films For An Optical Recording Disk

Nobuo Akahira; Takeo Ohta; Noboru Yamada; Mutsuo Takenaga; Tadaoki Yamashita

doi:10.1117/12.933394

27 May 1982 Sub-Oxide Thin Films For An Optical Recording Disk

Nobuo Akahira, Takeo Ohta, Noboru Yamada, Mutsuo Takenaga, Tadaoki Yamashita

Proceedings Volume 0329, Optical Disk Technology; (1982) https://doi.org/10.1117/12.933394
Event: 1982 Los Angeles Technical Symposium, 1982, Los Angeles, United States

Abstract

Thin films of SbOx, GeOx, TeOx, MoOx, InOx and PbOx ( x is smaller than the stoichiometric value for each component ) were found to have a feasibility to be applied to an optical recording disc. Upon heating, these thin films are critically changed in their optical constants at 150°, 280°, 120°, 150°, 120° and 100°C, respectively. The contrast ratios before to after heat treatment of the GeOx, TeOx and MoOx films of 1000 - 2000 Å thick are very high, they are 50, 20 and 15, respectively. Among them, the TeOx (x ≈1.1) film was excellent in both the sensitivity and the contrast ratio, and an optical recording disc was prepared by depositing the TeOx on a PMMA disc, substrate. Video-signals can be recorded and played back using a laser diode (λ =8300 Å, N.A.= 0.5) at the laser power of 6 - 8 mW incident. The carrier to noise ratio at 5 MHz was in excess of 55 dB.

Citation Download Citation

Nobuo Akahira, Takeo Ohta, Noboru Yamada, Mutsuo Takenaga, and Tadaoki Yamashita "Sub-Oxide Thin Films For An Optical Recording Disk", Proc. SPIE 0329, Optical Disk Technology, (27 May 1982); https://doi.org/10.1117/12.933394

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