Double-pass tunable fabry-perot optical filter
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United States of America Patent
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Aug 13, 1991
Grant Date -
N/A
app pub date -
Apr 30, 1990
filing date -
Apr 30, 1990
priority date (Note) -
Expired
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Abstract
This invention describes a double-pass optical filter having a pair of reflective surfaces with a pair of optical media of different indices of refraction inserted between the surfaces. Light is then passed through the surfaces and through each of the optical media to obtain selected frequencies. This invention also includes a means for varying the distance between the reflective surfaces so as to tune the filer over a continuous range of frequencies. The continuous simultaneous turning of two resonant can be achieved by merely displacing one reflective surface relative to another.
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