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Alluxa - Optical Coatings LB 8/23
Photonics Dictionary

finesse

For a Fabry-Perot interferometer or etalon, a value for the transmission bandwidth which can be calculated as the ratio of the free spectral range to the full width half maximum of the transmission peaks. For an etalon, a high finesse is dependent on high reflectivity. Defects in the reflective surface will result in a lower finesse.
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