Leakage-corrected linear variable filter
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United States of America Patent
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Jun 8, 1993
Grant Date -
N/A
app pub date -
Jul 6, 1990
filing date -
Jul 6, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A leak-corrected linearly variable filter comprises optical filter coatings formed on an assembly of one or more optically transmissive substrates. Leaks due to the longitudinal precession of incident light within the substrates are suppressed by forming the filter such that no two surfaces which are reflected at the same wavelength within the range of interest are parallel. Typically, the constituent substrates of the filter are oriented at a slight angle relative to one another and filter coatings having overlapping reflective wavelengths are deposited on different substrates rather than on the two parallel sides of the same substrate. Alternatively, venetian shade structures can be incorporated within the substrates to block longitudinal precession of light.
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