Laser Window Studies
Abstract
Laser calorimetry was applied to the determination of absorption coefficients of optical films and a study of commercially available examples of thorium fluoride, arsenic trisulfide, zinc sulfide and zinc selenide films was made. Attenuated total reflection spectroscopy was used to determine absorption behavior of the films between 2.5 micrometers and the infrared cutoff of their substrates. Exploratory development of a more sensitive technique for determining wavelength dependence of absorption and scattering began and an intense black body point source was designed and constructed. An apparatus for determining the microhardness of thin films was designed and constructed. Preparation and cleaning procedures were developed which produced optically- figured alkaline earth fluoride surfaces free of microscopically detectable defects. Six two-inch diameter polycrystalline strontium fluoride specimens were fabricated into windows by the diamond abrasive polishing technique developed on this program and delivered to the Monitoring Agency.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1975
- Accession Number
- ADA015567
Entities
People
- C. B. Willingham
- D. Bua
- F. Horrigan
- H. Statz
Organizations
- RTX