High-density read-only optical disk system using superresolution and an SHG green laser

Masumi Ono; Koichi Yasuda; Atsushi Fukumoto; Masahiko Kaneko

doi:10.1117/12.218738

8 September 1995 High-density read-only optical disk system using superresolution and an SHG green laser

Masumi Ono, Koichi Yasuda, Atsushi Fukumoto, Masahiko Kaneko

Proceedings Volume 2514, Optical Data Storage '95; (1995) https://doi.org/10.1117/12.218738
Event: Optical Data Storage '95, 1995, San Diego, CA, United States

Abstract

PSR (premastered optical disk by super-resolution) is a super-resolution technique used to increase the recording density of ROM optical disks. Our PSR system uses a novel disk with a nonlinear optical layer, a second-harmonic-generation green laser ((lambda) equals 532 nm), 0.52NA objective lens and eight-to-fourteen modulation coding. By using PSR, a high C/N ration of 51dB was obtained for a pit length of 0.2 micrometers which is beyond the conventional optical limit. Furthermore, we obtained a bit error rate of less than 10^-5 for a linear density of 0.185 micrometers /bit and a track pitch of 0.8 micrometers , thus demonstrating the feasibility of our PSR system with six times the areal density compared to the current CD.

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Masumi Ono, Koichi Yasuda, Atsushi Fukumoto, and Masahiko Kaneko "High-density read-only optical disk system using superresolution and an SHG green laser", Proc. SPIE 2514, Optical Data Storage '95, (8 September 1995); https://doi.org/10.1117/12.218738

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KEYWORDS

Reflectivity

Crystals

Refractive index

Super resolution

Optical discs

Second-harmonic generation

Dielectrics

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