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Proceedings Paper

Wavelength dependence of scatter from O-50 grade Beryllium mirrors
Author(s): Charles M. Egert; John C. Stover; Marvin L. Bernt
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Paper Abstract

A set of O-50 grade beryllium mirrors, removed from the polishing process at regular intervals, were subjected to a study of the wavelength dependence of scatter in the visible to infra-red. Analysis of these scatter measurements showed that the roughness calculated from the scatter measurements exhibited a parabolic wavelength dependence. The slope of the calculated roughness as a function of (lambda) 1/2 (the parabolic slope) was taken as a measure of this anomalous scatter wavelength dependence. Mirrors with significant surface pitting were found to have the largest parabolic slopes; while unpitted beryllium mirrors, exhibited similar, though still significant parabolic slopes, indicating that the wavelength scaled as expected. Scatter measurements made on two key beryllium mirrors partially coated with a thin aluminum film further confirmed that surface pitting and intrinsic optical properties of beryllium both contributed to anomalous scatter.

Paper Details

Date Published: 1 December 1993
PDF: 9 pages
Proc. SPIE 1995, Optical Scattering: Applications, Measurement, and Theory II, (1 December 1993); doi: 10.1117/12.162649
Show Author Affiliations
Charles M. Egert, Oak Ridge National Lab. (United States)
John C. Stover, TMA Technologies, Inc. (United States)
Marvin L. Bernt, TMA Technologies, Inc. (United States)


Published in SPIE Proceedings Vol. 1995:
Optical Scattering: Applications, Measurement, and Theory II
John C. Stover, Editor(s)

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