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Magnetooptical disk head with optical circulator structure

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Abstract

A magneto-optical disk has great potential as a erasable optical memory; however, some problems remain to be resolved. In a magnetooptical disk head, a half mirror generally has been used to detect Kerr rotation of the disk. To accomplish high read/write performance of the optical head, some improvements are required to reduce light fluctuation noise of the laser diode induced by the feedback light, which degrades a readout signal, and the power loss at the half mirror, which demands a much higher reliability of the laser diode in high power driving conditions and a high gain servo signal detection circuit.

© 1986 Optical Society of America

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