Photorefractive systems and methods

Details Photorefractive systems and methods Photorefractive systems and methods

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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