Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1992-02-18
1994-01-25
Young, W. R.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369112, G11B 700
Patent
active
052821889
ABSTRACT:
In a read/write head for a magneto-optical storage system, a optical wave plate is positioned between the partial polarization beam splitter to which the radiation from the source is applied and the analyzing beam splitter which directs the two components of the radiation beam to the differential detection system. Using the techniques herein described, equations are developed which identify the optimal parameters for the optical wave plate. The equations are derived for the retardation of the optical wave plate and for the angle of the slow axis of the optical wave plate relative to the read/write head optical coordinates. These two equations are given in terms of the phase between the s and the p polarization components. The equations are applied to the specific example wherein TbFeCo is the magneto-optical material. The inclusion of a liquid crystal element having a voltage controlled retardance permits the read/write head to be used with "write once" optical storage media as well as magneto-optical storage media.
REFERENCES:
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patent: 5105399 (1992-04-01), Shimonou
patent: 5155622 (1992-10-01), Kawatsuki et al.
patent: 5161133 (1992-11-01), Levenson
Challener et al., Jones matrix analysis of magneto optical media and read-back systems, Applied Optics, vol. 26, No. 18, Sep. 15, 1987, pp. 3974-3980.
Jones et al., A New Calculus for the Treatment of Optical Systems, J.O.S.A., vol. 31, 485, Jul. 1941, pp. 488-500.
Eastman Kodak Company
Holloway William W.
Young W. R.
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