Abstract

We have designed, constructed, and tested an instrument to calorimetrically measure the 10.6-μm absorption α of high reflectivity metal-substrate mirrors. Optical, electrical, and thermal design considerations will be discussed. The technique of absorption measurement, including the in situ heat capacities, the reflected laser light to an accuracy of ±4%, and the simplified data reduction technique will be discussed. From our error analysis we conclude that our accuracy is ±0.1α and has a precision of 0.0005. Comparative measurements on the same mirrors by different reflectivity and absorption devices and extensive absorption data on state-of-the-art 10.6-μm metal-substrate mirrors will be presented. The best absorption that we have measured is 0.0010 for a gold-coated multidielectric enhanced mirror.

© 1975 Optical Society of America

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