Magneto-optic readout using a polarization-preserving optical fi

Details Magneto-optic readout using a polarization-preserving optical fi Magneto-optic readout using a polarization-preserving optical fi

1990-12-03

1992-10-06

Arnold, Bruce Y.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

369110, 359281, 359283, G02F 109

Patent

active

051525976

ABSTRACT:
Apparatus for reading out information magneto-optically recorded in a magnetic layer comprises a single, polarization-preserving optical fiber for transmitting plane-polarized readout radiation from a source to the recording layer, as well as for transmitting such radiation, upon being reflected by the recording layer, toward a pair of photodetectors for the differential detection of the Kerr rotation angles (.+-..THETA..sub.k) produced by the up/down orientation of the vertically oriented magnetic domain in the recording layer. Optical feedback of the reflected readout radiation to the readout source is minimized by the provision of a pair of polarization beam-splitters having a 45 degree magneto-optic polarization-rotator (e.g. a Faraday rotator) positioned therebetween. The polarization beam-splitters and retardation plate are positioned in the optical path between the readout source and the optical fiber.

REFERENCES:
patent: 3969573 (1976-07-01), Bouwhuis et al.
patent: 4626679 (1986-12-01), Huwayama et al.
patent: 4671621 (1987-06-01), Dillon, Jr. et al.
patent: 4762384 (1988-08-01), Hegarty et al.
patent: 5004326 (1991-04-01), Sasaki
Matsumoto, "Polarization-Independent Isolators for Fiber Optics," Electronics and Communications in Japan, vol. 62-C, No. 7, 1979, pp. 113-118.

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