Abstract

The spectral and optical performances of Fabry-Perot interferometers having nonuniformities in spacing are discussed, and it is shown that the finesse F of an interferometer with a circular aperture and a parabolic nonuniformity in spacing and that of one with a rectangular aperture and a linear nonuniformity (lack of parallelism) are both given by F = π{[(1 − R)2/R] + [2πξ/λ]2}−1/2, where ξ is the maximum nonuniformity across the aperture and R is the plate reflectance. It is also shown that the nonuniformities impair the spectral performance more than the optical, particularly with incident white light.

© 1969 Optical Society of America

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