High-density optical disk system using a solid immersion lens

Isao Ichimura; Kiyoshi Osato; Fumisada Maeda; Hideo Owa; Hiroshi Ooki; Gordon S. Kino

doi:10.1117/12.218721

8 September 1995 High-density optical disk system using a solid immersion lens

Isao Ichimura, Kiyoshi Osato, Fumisada Maeda, Hideo Owa, Hiroshi Ooki, Gordon S. Kino

Proceedings Volume 2514, Optical Data Storage '95; (1995) https://doi.org/10.1117/12.218721
Event: Optical Data Storage '95, 1995, San Diego, CA, United States

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.

Citation Download Citation

Isao Ichimura, Kiyoshi Osato, Fumisada Maeda, Hideo Owa, Hiroshi Ooki, and Gordon S. Kino "High-density optical disk system using a solid immersion lens", Proc. SPIE 2514, Optical Data Storage '95, (8 September 1995); https://doi.org/10.1117/12.218721

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