Method and apparatus for bistable optical information storage fo

Details Method and apparatus for bistable optical information storage fo Method and apparatus for bistable optical information storage fo

1988-05-31

1990-10-23

McElheny, Jr., Donald

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

3692752, G11B 700

Patent

active

049657844

ABSTRACT:
A method and an optical device for bistable storage of optical information, together with reading and erasure of the optical information, using a photoactivated shift in a field dependent phase transition between a metastable or a bias-stabilized ferroelectric (FE) phase and a stable antiferroelectric (AFE) phase in an lead lanthanum zirconate titanate (PLZT). An optical disk contains the PLZT. Writing and erasing of optical information can be accomplished by a light beam normal to the disk. Reading of optical information can be accomplished by a light beam at an incidence angle of 15 to 60 degrees to the normal of the disk.

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