Holographic memory readout with reduced speckle

Details Holographic memory readout with reduced speckle Holographic memory readout with reduced speckle

1995-12-07

1997-11-18

Dzierzynski, Paul M.

Optical: systems and elements

Holographic system or element

Using modulated or plural reference beams

359 11, 359 32, 365216, 365125, G03H 110, G03H 112, G03H 122, G11C 700

Patent

active

056893515

ABSTRACT:
A method and apparatus are provided for reducing speckle noise in images read out from holographic memories. An image recorded in the memory is read out using a multiple component readout beam, with each component having the same horizontal orientation but a different vertical orientation. Because the Bragg effect is pronounced only in the horizontal direction, the readout beam components all access the same stored image. Each readout beam component is set to oscillate at a slightly different frequency such that the smallest frequency difference is greater than the reciprocal of the output detector response time. The multiple oscillating readout beam components can be produced by an acoustooptic deflector driven by a wideband electrical signal. The memory readout comprises multiple reconstructions of the desired image, with each image reconstruction oscillating at a slightly different optical frequency. The output detector receives a set of mutually incoherent image reconstructions that reduce the speckle noise through an image averaging effect, thereby improving the quality of the output image.

REFERENCES:
patent: 5416616 (1995-05-01), Jenkins et al.
patent: 5550779 (1996-08-01), Burr et al.
patent: 5642210 (1997-06-01), Stoll et al.
Hong et al., "Volume holographic memory systems: techniques and architectures," Optical Engineering, vol. 34, No. 8, pp. 2193-2203 (Aug. 1995).

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