Optical head with improved extinction ratio for magneto-optical

Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam

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369110, 369112, 360114, 365122, G11B 1100, G11B 700

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active

046725938

ABSTRACT:
An optical head for a magneto-optical memory in which the major axis (the phase advance axis or phase lag axis) of optical anisotropy of a lens focusing a linearly polarized laser beam onto a magneto-optical recording medium is arranged to coincide with the direction of linear polarization of the laser beam incident upon the lens, thereby improving the extinction ratio.

REFERENCES:
patent: 4451863 (1984-05-01), Yanagida et al.
patent: 4532619 (1985-07-01), Sugiyama et al.
patent: 4558440 (1985-12-01), Tomita
patent: 4561032 (1985-12-01), Matsumoto et al.
patent: 4569035 (1986-02-01), Tomita
patent: 4571650 (1986-02-01), Ojima et al.
patent: 4573149 (1986-02-01), Deguchi et al.

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