Holographic storage system for reading a hologram stored on a holographic storage medium and a method carried out therewith
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United States of America Patent
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Feb 21, 2012
Grant Date -
Apr 29, 2010
app pub date -
Jan 24, 2008
filing date -
Feb 6, 2007
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A holographic storage system for reading a hologram stored on a holographic storage medium. The system comprises: storage medium holding means; a spatial light modulator (SLM) for encoding a reference beam with a code pattern; a detector; and a servo control unit for determining a misalignment of the reference beam and the storage medium from the detected image and for acting upon the SLM to shift the code pattern. A method of reading a hologram stored on a holographic storage medium comprising: a) encoding a reference beam with a code pattern created by a spatial light modulator (SLM); b) detecting an image of the reconstructed hologram; c) determining a misalignment of the reference beam and the storage medium from the detected image; and d) shifting the code pattern on the SLM based at least in part on the misalignment.
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