Fabry-perot with device mirrors including a dielectric coating outside the resonant cavity
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United States of America Patent
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Jan 10, 1995
Grant Date -
N/A
app pub date -
May 18, 1993
filing date -
May 19, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a Fabry-Perot etalon or interferometer the metal mirrors are each provided with a dielectric coating on the side facing away from the enclosed gap. The dielectric coating leads to the advantage of peak transmittance being improved without the finesse being adversely affected. The dielectric coating is transparent for the wavelength (.lambda.) used and, preferably, has a thickness of about 0.25.lambda./n, n being the refractive index of the dielectric coating material. The coating, preferably, is of a material having a high index of refraction, examples thereof including zirconium dioxide, titanium dioxide, zinc sulfide, or zinc selenide.
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