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Optical multilayer thin film and beam splitter

  • US 5,579,159 A
  • Filed: 12/08/1994
  • Issued: 11/26/1996
  • Est. Priority Date: 02/18/1992
  • Status: Expired due to Term
First Claim
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1. A beam splitter, comprising:

  • a first prism having a predetermined refractive index;

    a second prism having a predetermined refractive index; and

    a multilayer polarizing light separating film interposed between said first and second prisms, said multilayer polarizing light separating film comprising a first layer having a predetermined refractive index and formed on said incoming side prism, and a plurality of lamination layers each composed of at least four sublayers each having different refractive indices, wherein each of the refractive indices is determined such that reflectance of a P polarized component of reflected light becomes equal to or greater than 80% when light is incident upon said film with an angle of incidence more than a predetermined angle.

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