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Growth and Hardening of Alkali Halides for Use in Infrared Laser Windows
Final rept. 1 May 1972-31 Jul 1975
OKLAHOMA STATE UNIV STILLWATER DEPT OF PHYSICS
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KCl crystals pulled from pretreated melts under an Ti gettered inert atmosphere have been shown to have as low an absorption as crystals grown by the RAP Bridgman method. A simple optical method has been developed to analyze KClEu for Eu content. Radiation damage significantly increases the 10.6 micrometers absorption of both KCl and NaCl. The absorption increase is caused by the F-aggregate centers. This result probably rules out the use of radiation strengthened KCl for high power laser window applications. The flow stress of KClEu was found to increase linearly with Eu content. The flow stresses of KBrxCl1-x crystals have the same temperature dependence as the flow stress of pure KCl.
APPROVED FOR PUBLIC RELEASE