Scatter or finish specifications for beryllium mirrors?

John C. Stover

doi:10.1117/12.21648

1 October 1990 Scatter or finish specifications for beryllium mirrors?

John C. Stover

Author Affiliations +

Proceedings Volume 1307, Electro-Optical Materials for Switches, Coatings, Sensor Optics, and Detectors; (1990) https://doi.org/10.1117/12.21648
Event: 1990 Technical Symposium on Optics, Electro-Optics, and Sensors, 1990, Orlando, FL, United States

Abstract

Scatter from beryllium mirrors often seems to be higher than expected based on mirror surface foughness data. The paper verifies the effects and shows that in addition to surface topography scatter is caused by mirror defects that are non-topographic in nature (subsurface flaws, optical contant variations across grain boundaries, etc.). This effect is more severe in them id IR than the visible because non-topographical scatter tends to scale as inverse wavelengths for several materials is presented and analyzed. Beryllium is found to be especially prone to these problems. The conclusion is reached, that a profile (or roughness) requirement is not sufficent speciefication to achieve low scatter space mirrors.

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John C. Stover "Scatter or finish specifications for beryllium mirrors?", Proc. SPIE 1307, Electro-Optical Materials for Switches, Coatings, Sensor Optics, and Detectors, (1 October 1990); https://doi.org/10.1117/12.21648

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