Optical: systems and elements – Holographic system or element – Having particular recording medium
Reexamination Certificate
2011-07-05
2011-07-05
Chang, Audrey Y (Department: 2872)
Optical: systems and elements
Holographic system or element
Having particular recording medium
C359S003000, C359S004000, C359S035000
Reexamination Certificate
active
07973989
ABSTRACT:
An updateable system and method of recording a hologram on a media simultaneously reduces the writing time and increases persistence without sacrificing diffraction efficiency. A voltage kick-off technique controls the bias electric field applied to a photorefractive polymer media in conjunction with the application of the writing beams and dark decay. Essentially the voltage kick-off technique applies a high electric field above the optimal field while the writing beams are on and reduces the electric field when the writing beams are off during dark decay. The voltage kick-off technique produced two separate unexpected results. First, when the writing beams are turned off and the electric field is lowered the diffraction efficiency continues to increase until it reaches a maximum efficiency that is within a few percent of that achieved by writing at the optimal field until steady-state is achieved. Second, the decay time constant is much larger than expected producing a much longer persistence without sacrificing diffraction efficiency or writing time.
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Blanche Pierre-Alexandre Jean
Norwood Robert A.
Peyghambarian Nasser N.
Tay Savas
Chang Audrey Y
Gifford Eric A.
The Arizona Board of Regents on Behalf of the University of Ariz
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