Detector for magnetooptic recorders

Details Detector for magnetooptic recorders Detector for magnetooptic recorders

1987-11-16

1989-04-18

Heinz, A. J.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

350404, 369110, G11B 5127

Patent

active

048232203

ABSTRACT:
A modulated light beam, as received from a magnetooptic record medium, carries information in the form of linear polarization rotations having P and S components, herein also referred to as light-phase modulated light. A phase-to-intensity converter optically rotates one of the component linear polarization to be aligned with the linear polarization of the other component. The rotated component and the other component are then combined along a common optical path for interferometrically generating a single intensity-modulated light beam. The intensity-modulated light beam is then detected with an output electrical signal indicative of the information carried by the P and S components. In one form, the phase-to-intensity converter includes generating two intensity-modulated light beams using interferometric techniques, separately detecting the intensity modulator light beams and combining same electrically in a differential amplifier.

REFERENCES:
patent: 4100577 (1978-07-01), Naruse et al.
patent: 4136362 (1979-01-01), Naruse et al.
patent: 4451863 (1984-05-01), Yanagida et al.
patent: 4609961 (1986-09-01), Jacobs
Treves et al., "Signal, Noise, and Codes in Optical Memories", Optical Engineering; vol. 25, No. 7; Jul., 1986; pp. 881-889.

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