Etalons with dispersive coatings
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United States of America Patent
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Mar 1, 1994
Grant Date -
N/A
app pub date -
Mar 25, 1992
filing date -
Mar 25, 1992
priority date (Note) -
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Abstract
An etalon (10) is provided with a coating (12) so as to selectively pass spectral lines of interest. The etalon includes a substrate (14) having a first major surface and a second, opposite major surface. The etalon further includes a coating, preferably a rugate coating (12), formed upon at least one of the major surfaces. The rugate coating has a spatially varying index of refraction profile through a depth thereof. The profile is selected so as to provide the element with a prescribed dispersion characteristic that matches a dispersion characteristic of a source of the radiation signal.
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