Non-destructive readout mechanism for volume holograms using two wavelengths
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United States of America Patent
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Aug 1, 1995
Grant Date -
N/A
app pub date -
Aug 13, 1993
filing date -
Aug 13, 1993
priority date (Note) -
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Abstract
Multiple volume holograms are recorded by changing the incidence angle of the reference beam at one wavelength. The stored holograms are reconstructed at another wavelength by using the reference beam oriented at the proper incidence angle. The proper holographic data are retrieved by pre-formatting or post-formatting the holographic data to be recorded or reconstructed. This usage of using different wavelengths for recording and reconstruction are independent of the scanning mechanisms for the reference beam. Utilization of holographic memories for storage and retrieval of data, and correlations can make use of this invention.
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