Moisture Protective Coatings for Alkali Halide IR Optics

Abstract

The objective of this program was to develop plasma-polymerized films that are transparent, moisture-protective coatings to increase the lifetime and durability of press-forged KBr IR optical elements. Reaction conditions were established that yielded uniform films of plasma-polymerized ethane (PPE) on polished and etched single-crystal KBr flats and press-forged KBr lenses. Polycrystalline KBr formed localized grains on polishing that could not be removed by chemical etching with HBr. Since the hygroscopic nature of alkali halides is due to the presence of surface hydroxyl groups, passivation methods were developed to minimize the effect of these groups. Keywords: Protective coatings, Alkali halide optics, Plasma polymerization, FI optical windows, Infrared transmitting polymers, Polymeric protective coatings, Moisture protective coatings.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1981
Accession Number
ADA187900

Entities

People

  • Frederick G. Yamagishi

Organizations

  • HRL Laboratories

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Chemical Reactions
  • Chemical Synthesis
  • Chemistry
  • Contracts
  • Crystal Lattices
  • Crystal Structure
  • Crystals
  • Electro-Optics
  • Finishes
  • Fungi
  • Halogens
  • Materials
  • Materials Laboratories
  • Materials Science
  • Protective Coatings
  • Refractive Index
  • Single Crystals

Readers

  • Electrochemical Engineering/ Fuel Cell Technologies
  • Materials Science
  • Optical Physics and Photonics.