Abstract
J. Strong and E. Gaviola1 described the preparation of optical aspherics by vacuum evaporation. They used layers of aluminium to parabolize mirrors, but found that with thickness greater than 5λ the coating began to show a bloom and scatter light. Apparatus for the production of refracting elements by this method was described by L. G. Schulz2; Schulz used lithium fluoride and was able to produce aspheric films giving a retardation [ (n − 1)t] of up to 2.5λ. At that thickness the films began to peel off. The retardation could be doubled by covering the lithium fluoride film with a layer of collodion and evaporating on to this another layer of lithium fluoride.
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References
J. Opt. Soc. Amer., 26, 153 (1936).
J. Opt. Soc. Amer., 38, 432 (1948).
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DOBROWOLSKI, J., WEINSTEIN, W. Optical Aspherizing by Vacuum Evaporation. Nature 175, 646–647 (1955). https://doi.org/10.1038/175646b0
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DOI: https://doi.org/10.1038/175646b0
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