Exploratory Development on Antireflective Coating for 2 to 6 Micrometers for Fluoride Windows.
Final rept. May 76-Dec 77,
HUGHES RESEARCH LABS MALIBU CALIF
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The exploratory development program described in this report had as its basic objective the provision of antireflection thin films or thin film systems for single crystal and polycrystalline alkaline earth fluoride laser window materials. The films must be of sufficiently high optical quality and uniformity to satisfy the constraints imposed by use as coating materials in high-power infrared DF and CO laser systems operating in the 2 to 6 micrometer region. In addition, they must have sufficient ruggedness to survive the environmental conditions expected in such an operation. Since the performance of the deposited film systems, and therefore of the finished coated window, is critically dependent on substrate quality, an important part of this program was the development of adequate substrate polishing, cleaning, and handling procedures. Because windows approaching 12 m in diameter may be required in the future, both the substrate preparation and the thin film deposition techniques were established with a sufficiently high degree of reproducibility and quality control so that the technology could be and was successfully scaled-up and transferred to an operating division after a short developmental period.
- Lasers and Masers
- Coatings, Colorants and Finishes