Optical: systems and elements – Holographic system or element – Using modulated or plural reference beams
Patent
1997-12-15
2000-01-18
Henry, Jon
Optical: systems and elements
Holographic system or element
Using modulated or plural reference beams
359 1, 365125, 365216, G03H 122, G11C 1304
Patent
active
060162104
ABSTRACT:
A method and an apparatus for increasing detection signal-to-noise ratio, while reading out a hologram from a holographic storage medium, are disclosed. The hologram is written by interfering a write reference beam with an object beam. The method comprises the steps of (1) effecting multiple sequential hologram-read operations using multiple read reference beams separated from each other by a separation angle; (2) shifting the detector array contents in between hologram-read operations such that the data signal patterns incident on the detector array are approximately identical but the incident scatter noise patterns are uncorrelated; and (3) integrating the multiple hologram readouts electronically on the detector array. The apparatus comprises a laser source, a beamsteerer, a detector array and a shifting device.
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Anderson Terry J.
Henry Jon
Hoch Jr. Karl J.
Northrop Grumman Corporation
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