8 September 1995 High-density optical disk system using a solid immersion lens
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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
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.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Isao Ichimura, Kiyoshi Osato, Fumisada Maeda, Hideo Owa, Hiroshi Ooki, Gordon S. Kino, "High-density optical disk system using a solid immersion lens", Proc. SPIE 2514, Optical Data Storage '95, (8 September 1995); doi: 10.1117/12.218721; https://doi.org/10.1117/12.218721


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