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Proceedings Paper

Cast Tenzaloy aluminum optics
Author(s): Fred F. Forbes
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Paper Abstract

Since the early sixties, cast aluminum optics has held out a promise of low cost, durability, lightweight, ease of manufacture, the possibility of welding together sections to form large optics and a good match of some astronomical programs such as photometry. Needless to say, this rosy future has been fraught with difficulties. Poor short-term stability, sensitivity to temperature, porosity, bimetallic warping, soft optical surface, poor specularity, nickel adhesion problems, poor image quality, and the inability to generate aspherics, have all contributed to the bad name cast aluminum optics has acquired over the years. With the advent of improved aluminum alloys, long-term dimensional stability data, advances in adaptive optics and the need for very large monolithic mirrors with a relatively low handling risk, aluminum optics deserve another look. This paper is a collection of some of the early attempts to build cast aluminum mirrors using the stable alloy, Tenzaloy. The results of those efforts are discussed together with recommendations for future aluminum metal mirror work.

Paper Details

Date Published: 15 October 1993
PDF: 6 pages
Proc. SPIE 1931, Metal Mirrors, (15 October 1993); doi: 10.1117/12.158729
Show Author Affiliations
Fred F. Forbes, National Optical Astronomy Observatories (United States)

Published in SPIE Proceedings Vol. 1931:
Metal Mirrors
Richard G. Bingham; David D. Walker, Editor(s)

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