Abstract
THE phase retardation provided by evaporated fluoride films on transparent plates, suggested by E. H. Linfoot1 as being of possible use in phase contrast microscopy, finds an important application in interferometry, where the phase-retarding areas have to be of much larger dimensions than are involved in phase contrast microscopy or applications of the Zernike test. It forms the basis of a method, developed here some time ago, of distinguishing between under-and over-correction of the aberrations corresponding to the pattern of interference fringes observed while using the Hilger lens-testing interferometer.
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References
Linfoot, E. H., Nature, 155, 76 (1945).
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COX, A. Phase-retarding Areas. Nature 155, 425–426 (1945). https://doi.org/10.1038/155425a0
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DOI: https://doi.org/10.1038/155425a0
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