Potassium bromide for infrared laser windows: Crystal growth, chemical polishing, and optical absorption

Philipp H. Klein, James W. Davisson, James A. Harrington

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Abstract

Potassium bromide single crystals have been prepared with 10.6-μm bulk absorption coefficients smaller than the intrinsic value for potassium chloride. Of several halogen-producing vapors studied, that of carbon tetrachloride is most effective in decreasing infrared absorption. Water-grinding, followed by polishing with HBr solutions, produces non-absorbing and etch-pit-free surfaces on planes remote from (100). Hydroxyl lines are absent from infrared absorption spectra of all crystals. Vacuum-ultraviolet absorption at 215 nm shows presence of between 0.01 and 4.0 OH- ions per million anions. Incomplete removal of metaborate (BO-2) by iodine monobromide or by hexabromobenzene is evident in infrared absorption spectra.

Original languageEnglish (US)
Pages (from-to)1335-1342
Number of pages8
JournalMaterials Research Bulletin
Volume11
Issue number10
DOIs
StatePublished - Oct 1976

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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