High-integrity seal for optical elements, dichromated gelatin holographic optical elements in particular
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United States of America Patent
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Jul 13, 2010
Grant Date -
Aug 14, 2003
app pub date -
Jan 27, 2003
filing date -
Jan 25, 2002
priority date (Note) -
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Abstract
A method and apparatus for encapsulating optical elements, particularly dichromated gelatin (DGC) holographic optical elements (HOEs), exhibits a very high degree of environmental integrity. In broad terms, the optical element is disposed between opposing plates, and a metal seal soldered to the edge(s) of the plates to seal the optical element therewithin. In the preferred embodiment, the metalization includes chrome and nickel, or alloys thereof, followed by gold or platinum. The metallization is preferably applied using a low-temperature process such as vacuum deposition or sputtering. The metal seal may be in the form of a foil or wire. One or both of the plates are compatible with wavelengths of interest, and the technique may be used in transmissive and reflective configurations.
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