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US 5,684,611 AGranted
Photorefractive systems and methods
AssigneeAccuwave Corporation
InventorsGeorge Anthony Rakuljic, Amnon Yariv
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AssigneeAccuwave Corporation
InventorsGeorge Anthony Rakuljic, Amnon Yariv
Estimating the term…
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.
The method of recording a plurality of holographic images in a volumetric recording material comprising the steps of:
A holographic storage device comprising:
A photoreactive crystal having at least one reflection hologram recorded therein, the hologram comprising a plurality of interference gratings each disposed along a given axis throughout the crystal, each having a different non-harmonically related periodicity and the product of counterpropagating beams, and wherein the gratings have a half-life in excess of 50 years at ambient temperature and wherein the coupling coefficient .kappa. is in excess of about 1 cm.sup.-1.
A system for writing data comprising:
Dependencies are inferred from the claim text.