Abstract

A magnetooptical disk drive employing some useful techniques for high performance has been developed for digital file use. A quadrilayer structure with AlN films promises high reliability of the medium as well as enhancement of Kerr rotation. The azimuth of the polarization plane is also increased by the beam splitter, of which Rs (reflectivity of S wave) is larger than Rp (reflectivity of P wave). Parallel control of both actuator and linear motor is used for high tracking accuracy. 4/5 MNRZI modulation is found to be a useful modulation method for the magnetooptical memory system.

© 1984 Optical Society of America

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