Magneto-optic information storage system utilizing a self-couple

Details Magneto-optic information storage system utilizing a self-couple Magneto-optic information storage system utilizing a self-couple

1983-09-06

1986-02-18

Richardson, Robert L.

Dynamic magnetic information storage or retrieval

Head

Read only detector using light for reading magnetically...

369 13, 369110, 365122, G11B 700, G11B 1100

Patent

active

045716501

ABSTRACT:
An optical information storage system wherein information is read from a magneto-optical storage medium by indicating the storage medium with a first laser beam generated by a semiconductor laser and exploiting the self-coupling effect of the semiconductor laser in response to light reflected from the storage medium to generate a second laser beam. A Faraday rotator is disposed in an optical path along which the reflected light from the magneto-optical storage medium returns to the semiconductor laser and a polarization rotating angle of the Faraday rotator is selected so that the oscillating polarization plane of the semiconductor laser is changeable in dependence upon the perpendicular magnetization direction of the magneto-optical storage medium. A linear polarizer is interposed between the semiconductor laser and a photodetector to extract from the second laser beam at least one polarization component parallel or perpendicular to a junction plane of the semiconductor laser with the extracted component being detected by the photodetector.

REFERENCES:
patent: 4410277 (1983-10-01), Yamamoto et al.
patent: 4451863 (1984-05-01), Yanagida et al.

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