Investigate Material Systems for Mirrors Used in High Power CO and CO2 Lasers
Semiannual technical rept.
PACIFIC NORTHWEST LABS RICHLAND WA
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Results are presented from the first phase of a three-phase program sponsored by Advanced Research Projects Agency to develop a laser mirror material system. Copper, dispersion hardened with the addition of 0-5 vol SiC or Al2O3 was deposited by high-rate sputtering to produce a stable, fine-grain 0.4 micrometer polishable material exhibiting a surface roughness of less than 15 A rms when it was mechanically polished. Instruments for measuring surface roughness by scattered light and mirror absorption by differential calorimetry were also designed, constructed, and successfully employed in measuring surface properties and mirror optical absorption.
- Lasers and Masers