Abstract
The effect of the size of the small aperture which isolates the central portion of the interference fringe system in the photoelectric scanning Fabry-Perot interferometer has been investigated. The phase shift due to size of aperture is given accurately by Δ=Kθ2/2, where K is half the phase difference and θ the angular radius of the aperture, only if the diameter of the aperture is not greater than about one-eighth of the diameter of the first interference ring. This phase shift is equivalent to a length correction with the Fabry-Perot interferometer of θ2/4 per unit length. This simple relation cannot be used with larger apertures, and visibility considerations make the use of such apertures quite undesirable.
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