Preparation and Characterization of Polycrystalline Halides for Use in High Power Laser Windows
Quarterly technical rept. no. 2, 1 Jul-30 Sep 1972
HONEYWELL CORPORATE TECHNOLOGY CENTER BLOOMINGTON MN
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The mechanisms of high temperature deformation of alkali halides are reviewed. It is shown that at high temperatures it is possible to deform these materials to an arbitrary shape without void formation. The practical implementation of methods for hot working halides to produce strengthened polycrystalline bodies are described. The mechanical, microstructural and optical properties of polycrystalline potassium chloride produced are presented. The mechanical strength of the polycrystalline material is about 8X higher than that of the single crystal. A stable microstructure of approximately 5 micrometers diameter grains can be produced. However, excessive deformation can produce abnormal grain growth at room temperature. The optical absorption of the hot worked materials is essentially unchanged from that of the starting single crystals. Some results of interferometric measurements of laser-induced deformation are presented. An expression for the temperature rise produced by irradiation of a low absorption sample by a laser beam is given.
- Lasers and Masers