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