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METHOD FOR THE PREPARATION OF MULTILAYER OPTICAL FILTERS

  • US 3,847,585 A
  • Filed: 01/08/1973
  • Issued: 11/12/1974
  • Est. Priority Date: 01/08/1973
  • Status: Expired due to Term
First Claim
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1. A method for the preparation of a multilayer optical filter, the steps of the method comprising providing at least first and second thermoplastic transparent glass compositions, dividing the first and second glass compositions into first and second substreams, interdigitating the first and second substreams to provide a single composite stream, deforming the single composite stream to alternate the shape of the substreams to provide the substreams with a plurality of interfaces, the interfaces being deposited in generally parallel planes which are parallel to a major surface of the composite stream and being separated by a distance from about 0.05 micron to about one micron, with the further limitation that the first and second glass compositions have refractive indices which differ from each other by at least about 0.05.

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