Optical: systems and elements – Holographic system or element – Having particular recording medium
Patent
1995-06-06
1997-11-04
Dzierzynski, Paul M.
Optical: systems and elements
Holographic system or element
Having particular recording medium
359 3, 359 10, 359 22, 359 28, G03H 102
Patent
active
056846118
ABSTRACT:
A new type of holographic recording in photorefractive crystals is disclosed, termed orthogonal data storage, in which counterpropagating, reflection mode holograms are wavelength multiplexed to form gratings lying along a common axis. It is shown that this configuration provides substantial improvements in data storage capacity in comparison to prior art systems and that higher coupling coefficients are achieved. In consequence, not only storage of data but a wide range of other devices including wavelength selective filters, lenses and optical correlation systems are disclosed. Further, methods of writing and processing metastable images are disclosed which substantially improve the strength of the gratings that are permanently developed in the medium. These methods include advantageous use of electrical potentials and photovoltaic properties, together with different interrelationships during processing.
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Rakuljic George Anthony
Yariv Amnon
Accuwave Corporation
Dzierzynski Paul M.
Schuberg Darren E.
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