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Multi-layer interference filter

  • US 4,747,666 A
  • Filed: 06/18/1986
  • Issued: 05/31/1988
  • Est. Priority Date: 06/25/1985
  • Status: Expired due to Fees
First Claim
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1. A multi-layer interference filter, comprising a substrate, a first stack, a second stack and a third stack, said stacks composed of high refractive index layers and low refractive index layers, which are alternately arranged, the first stack of said three stacks being a central stack having a number of layers about half of the number of all layers and which layers are set to a desired optical quarter-wave thickness, and wherein the second stack and the third stack are each arranged on opposite sides of said first stack and have a number of layers of about 1/4 times the number of all layers and which layers are set so that the individual layers of both the second and third stacks each have an optical thickness which is different from each other and is different from said desired quarter-wave optical thickness of the layers of the first stack.

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