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A compact (L ≈ 5 cm) spherical Fabry-Perot interferometer with adjustable mirror spacing is used to produce interference fringes with frequency separation (c/2L)/N , N 20. These fringes are used as frequency markers in a Doppler-free saturation spectroscopy experiment. The conditions for observation of the fringes are discussed in terms of the eigenmodes of the cavity with high transverse indices.doi:10.1063/1.1304879 fatcat:ksjraznmdvakfggrb3pmmucrve