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Proceedings Paper

Control of thermally induced porosity for the fabrication of beryllium optics
Author(s): Harry A. Moreen
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Paper Abstract

In this study we have examined the polishability of bare beryllium as it relates to processing for the fabrication of a mirror substrate. Our work has shown that annealing treatments can produce microporosity in the beryllium by a mechanism known as Thermally Induced Porosity (TIP). When the porous material is polished, the achievable scatter is degraded. TIP response is sensitive to the processing history of the material and the effect can vary from minimal to substantial. We have also demonstrated a scatter screening test which can indicate the sensitivity of a given lot of material to TIP.

Paper Details

Date Published: 1 September 1991
PDF: 8 pages
Proc. SPIE 1485, Reflective and Refractive Optical Materials for Earth and Space Applications, (1 September 1991); doi: 10.1117/12.46523
Show Author Affiliations
Harry A. Moreen, Rockwell International Corp. (United States)

Published in SPIE Proceedings Vol. 1485:
Reflective and Refractive Optical Materials for Earth and Space Applications
Max J. Riedl; Robert R. Hale; Thomas B. Parsonage, Editor(s)

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