System and method using a voltage kick-off to record a...

Optical: systems and elements – Holographic system or element – Having particular recording medium

Reexamination Certificate

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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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patent: 6859293 (2005-02-01), Klug et al.
Oksana Ostroverkhova et al, Organic Photorefractives: Mechanisms, Materials, and Applications, Chem Rev. 104, 3267-3314, Jun. 26, 2004.
M. Eralp et al, Submillisecond response of a photorefractive polymer under single nanosecond pulse exposure, Applied Physics Letters 89, 114105, Sep. 13, 2006.

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