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The performance of a birefringent Fabry–Perot interferometer with a 50-mm diam aperture. The top graph shows the transmittance of the interferometer for monochromatic light without mica in the cavity as a function of the spacing between the plates. The bottom left shows the same function when mica coated with cryolite antireflection layers is inserted. The bottom right shows the function when mica of a different thickness coated with a triple-layer antireflection coating is inserted. For these tests the 632.8-nm line from a He–Ne laser has been used without any additional filtering; the small subsidiary maximum is due to an additional line from the He–Ne discharge.