Magneto-optical data recording device using a wavelength and pol

Details Magneto-optical data recording device using a wavelength and pol Magneto-optical data recording device using a wavelength and pol

1987-08-12

1990-10-23

Levy, Stuart S.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369110, G11B 1112, G11B 712, G11B 1304

Patent

active

049657801

ABSTRACT:
An optical mass storage device for use in data processing systems. Two or more lasers provide separate read and write laser beams having different wavelengths. The read and write laser beams can be orthogonally polarized. A polarizing beam splitter combines the read and write beams along a common optical path to an optical head. The head directs the combined beam to a magneto-optic storage medium. A read beam is reflected back by the medium to the common path through the head. A dichroic beam splitter disposed in the common path between the head and the polarizing splitter reflects the read beam to an optical detector. If more than one write laser is necessary, a second dichroic splitter can be used to combine the multiple write beams and the read beam.

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patent: 4700336 (1987-10-01), Yoshida et al.
MacLeod, H. A., "Dichroic Beam Splitters", Society of Photo Optical Instrumentation Eng., vol. 695 Optical Mass Data Storage II, (1986).
Botez, D., "Recent Developments in High-Power Single-Element Fundamental-Mode Didode Lasers", Laser Focus-Electro Optics, Mar. 1987.
Mansuripur et al., "Optimum Disk Structures and Engergetics of Domain Formation in Magneto-Optical Recording", IEEE Transactions on Magnetics, vol. Mag-18, No. 6, Nov. 1982.
Ishil, A., "A Magnetooptic Video Disk Readout Method Using a Pair of Polarized Laser Beams", Electronics and Communications in Japan, vol. 63-C, No. 2, 1980.

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