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1 December 1993 Wavelength dependence of scatter from O-50 grade Beryllium mirrors
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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.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Charles M. Egert, John C. Stover, and Marvin L. Bernt "Wavelength dependence of scatter from O-50 grade Beryllium mirrors", Proc. SPIE 1995, Optical Scattering: Applications, Measurement, and Theory II, (1 December 1993);


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