Numerical Evaluation of the Intensity Curve of a Multiple-Beam Fizeau Fringe

抄録

Intensity distribution curve of a multiple-beam Fizeau fringe is numerically evaluated for a typical case: normal incidence, R (the reflectivity of silver film)=0.90, θ (the wedge angle)=3×10⁻³ rad., and the order of fringe t⁄\fracλ2=6 in which t represents the thickness of the wedge at the point where the fringe is formed and λ the wave-length of light. The main maximum is about 80% as high as that of the corresponding Fabry-Perot fringe, and is slightly asymmetric. Secondary maxima suggested by Brossel are verified. They are restricted to one side of the main maximum in which the wedge is thicker. The cause of the asymmetry of the main maximum and the origin of secondary maxima are discussed.