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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 42, Iss. 11 — Nov. 1, 1952
  • pp: 806–808

The Design of Optical Filters

L. IVAN EPSTEIN  »View Author Affiliations


JOSA, Vol. 42, Issue 11, pp. 806-808 (1952)
http://dx.doi.org/10.1364/JOSA.42.000806


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Abstract

According to Herpin’s theorem, a symmetrical thin-film combination is equivalent, at one wavelength, to a single film, characterized by an equivalent index and equivalent thickness. If a large number of identical nonabsorbing thin-film combinations are combined, the resulting periodically stratified medium acts as a band-stop filter. In a stop band, the equivalent index of a symmetrical period is a pure imaginary; in a pass band, it is real. Equivalent indices are given for some commonly used periods. These may have values not possessed by any existing substance. These periods have proved useful in the design of optical filters and antireflection coatings.

Citation
L. IVAN EPSTEIN, "The Design of Optical Filters," J. Opt. Soc. Am. 42, 806-808 (1952)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-42-11-806

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