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Proceedings Paper

High-density optical disk system using a solid immersion lens
Author(s): Isao Ichimura; Kiyoshi Osato; Fumisada Maeda; Hideo Owa; Hiroshi Ooki; Gordon S. Kino
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Paper Abstract

A solid immersion lens (SIL) attached to a conventional objective could multiply the effective numerical aperture of an optical pick-up by a factor of refractive index n. A truncated hemispherical SIL (n equals 1.5) mounted on a slider, which was designed to follow the movement of the objective, kept good contact between the SIL and a disk substrate with a slight amount of air gap. Our simple configuration enabled the use of this method in an unsealed environment and extended the spatial cut-off frequency by 1.5 times. In addition, the combination with a second-harmonic generation green laser yielded high areal density optical data storage, six times that of current CD systems.

Paper Details

Date Published: 8 September 1995
PDF: 6 pages
Proc. SPIE 2514, Optical Data Storage '95, (8 September 1995); doi: 10.1117/12.218721
Show Author Affiliations
Isao Ichimura, Sony Corp. (Japan)
Kiyoshi Osato, Sony Corp. (Japan)
Fumisada Maeda, Sony Corp. (Japan)
Hideo Owa, Sony Corp. (Japan)
Hiroshi Ooki, Sony Corp. (Japan)
Gordon S. Kino, Stanford Univ. (United States)


Published in SPIE Proceedings Vol. 2514:
Optical Data Storage '95

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