Method and apparatus for bistable optical information storage for erasable optical disks

Patent · Sun Dec 31 23:00:00 EST 1989

OSTI ID:867573

Land, Cecil E ^[1]; McKinney, Ira D ^[1]

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1. Albuquerque, NM

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.

• Research Organization: AT & T CORP
• DOE Contract Number: AC04-76DP00789
• Assignee: Sandia Corporation (Albuquerque, NM)
• Patent Number(s): US 4965784
• OSTI ID: 867573
• Country of Publication: United States
• Language: English

Related Subjects

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15
60
accomplished
afe
angle
antiferroelectric
apparatus
beam
bias-stabilized
bistable
bistable optical
bistable storage
contains
degrees
dependent
device
disk
disks
erasable
erasing
erasure
ferroelectric
field
incidence
incidence angle
information
information storage
lanthanum
lanthanum zirconate
lead
lead lanthanum
light
light beam
metastable
method
normal
optical
optical device
optical information
phase
phase transition
photoactivated
plzt
reading
shift
stable
storage
titanate
transition
writing
zirconate
zirconate titanate