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Optical filters with coatings transmissive in narrow waveband regions

  • US 5,399,298 A
  • Filed: 10/27/1986
  • Issued: 03/21/1995
  • Est. Priority Date: 11/01/1985
  • Status: Expired due to Term
First Claim
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1. An optical filter in the form of a multi-layer coating adherent to a substrate, said coating comprising a plurality of superimposed layer collections, said plurality being n in number where n is at least four, each layer collection comprising ordered first second and third layers, said first and third layers each being made of a first optical coating material and having a thickness of substantially 0.6 quarter wavelengths at a predetermined wavelength, said second layer being made of a second optical coating material and having a thickness of substantially 6.8 quarter wavelengths at said predetermined wavelength, one of said first and second optical coating materials having a high refractive index and the other of said optical coating materials having a low refractive index, whereby the coating is generally transmissive except in a number of narrow-waveband regions, said predetermined wavelength being selected so that at least one of said regions includes a known laser wavelength.

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