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OPTICAL FILTER AND METHOD OF MANUFACTURING THEREOF

  • US 20040240064A1
  • Filed: 04/22/2004
  • Published: 12/02/2004
  • Est. Priority Date: 04/24/2003
  • Status: Active Grant
First Claim
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1. An optical element (transmissive or reflective) comprising, (a) a substrate;

  • (b) a first diffraction grating layer;

    (c) a single uniform layer, and;

    (d) a second diffraction grating layer.

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