Magneto-Optical Detection Using an Optical Phase Shifter in Higher Track Density Land/Groove Recording

We report the results of magneto-optical (MO) detection using an optical phase shifter in land/groove recording. We found that the MO detection method improves not only readout carrier level but also cross-talk characteristics against optical errors. Using this method with a 693-nm wavelength diode...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 1998-04, Vol.37 (4S), p.2144
Main Authors: Fukumoto, Atsushi, Kai, Shin-ichi, Masuhara, Shin, Aratani, Katsuhisa
Format: Article
Language:English
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Summary:We report the results of magneto-optical (MO) detection using an optical phase shifter in land/groove recording. We found that the MO detection method improves not only readout carrier level but also cross-talk characteristics against optical errors. Using this method with a 693-nm wavelength diode laser and a 0.55- NA objective lens, sufficient readout margins against optical errors were experimentally obtained at a 3.69-Gbit/in 2 areal density, which yielded a 0.35-µm bit length and a 0.5-µm track pitch. Recording with a track density 1.4 times higher was achieved by introducing a 640-nm wavelength diode laser, a 0.7- NA objective lens, and a 0.258-µm bit length and yielded an areal density of 6.95 Gbit/in 2 .
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.37.2144