Coefficient of Finesse

$F = (4* R )/(1- R )^2$

Enter a value for all fields

The Coefficient of Finesse is from a Fabry-Pérot Interferometer, which is made of a transparent plate with two reflecting surfaces, or two parallel highly reflecting mirrors. The following formula is used: $F=(4R)/(1-R)^2$ , where:

$R$ = Reflectance
$F$ = Coefficient of Finesse

References

The formula and definition are from Wikipedia (https://en.wikipedia.org/wiki/Fabry%E2%80%93P%C3%A9rot_interferometer#Theory).