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High reflectivity coated mirror producing 90 degree phase shift

  • US 4,312,570 A
  • Filed: 09/14/1979
  • Issued: 01/26/1982
  • Est. Priority Date: 09/14/1979
  • Status: Expired due to Term
First Claim
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1. A high reflectivity mirror producing a substantially 90°

  • relative phase shift between the s and p plane polarization components of the reflected light, comprising;

    a substrate; and

    a plurality of superimposed transparent layers on the substrate, adjacent layers being made of materials of substantially different indices of refraction, the thicknesses of the layers differing from each other in a predetermined manner to produce a substantially 90°

    phase shift in the s and p components of the reflected light for a broadband range of wavelenghts, wherein the physical thickness of each layer may be determined from the following equation;

    ##EQU2## where λ

    o is the wavelength in vacuum of the incident light, ni is the index of refraction of the layer material, θ

    o is the angle of incidence, and fi is the fraction of the nominal quarterwave thickness which is optimized to provide maximum reflectivity with the desired 90°

    phase shift.

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