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SCATTER NOISE REDUCTION IN HOLOGRAPHIC STORAGE SYSTEMS BY SPECKLE AVERAGING
SCATTER NOISE REDUCTION IN HOLOGRAPHIC STORAGE SYSTEMS BY SPECKLE AVERAGING
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机译:散斑平均减少全息存储系统中的散射噪声
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摘要
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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