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Photodetector filter structure

  • US 3,976,875 A
  • Filed: 06/24/1975
  • Issued: 08/24/1976
  • Est. Priority Date: 06/24/1975
  • Status: Expired due to Term
First Claim
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1. An optical filter structure for a photodetector comprising:

  • a transparent dome in the shape of a segment of a spherical shell of uniform thickness, said dome positioned in front of the photodetector with a concave surface of the dome facing the photodetector so that light passing through the dome normal to the dome'"'"'s surface will intersect at the center of the photodetector;

    an interference filter on the surface of the dome; and

    an absorption filter between the dome and the photodetector.

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