Laser Window Surface Finishing and Coating Technology
Semiannual technical rept. no. 2
HUGHES RESEARCH LABS MALIBU CA
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Potassium chloride surfaces have been produced on reactive atmosphere processed RAP KCl using HCl etching which show an order of magnitude improvement in KCl surface damage resistance. Surface damage level approaches the bulk level in some KCl samples. An inverse dependence of 10.6 micrometer optical absorption on film deposition rate is reported for germanium films, beta of approximately 10cm is reported for the best films. Ion beam sputtering of ThF4 using pure argon ion beams results in films deficient in fluorine having high optical absorption at 10.6 micrometers. Reactive sputtering in argon- fluorine gas mixtures may be required for producing stoichiometric fluoride films. Rutherford backscattering for chemical analysis of films and window surface structure promises to be a new powerful technique for such studies, using moderate beam energies of 180 KeV H and 280 KeV H.
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