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Proceedings Paper

Progress toward making lightweight 8-m mirrors of short focal length
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Paper Abstract

A technique has been developed for casting glass in the form of a honeycomb structure possessing good stiffness despite its low weight, and facilitating thermal control via forced ventilation of the honeycomb cells. To date, 3.5 m diameter mirrors of this type have been successfully cast; fully 8 m diameter mirrors are expected to be cast by 1992. No mirror of diameter as large as 8 m has ever been polished, however, and the difficulties which will be encountered shall be compounded by the shorter focal lengths required for advanced telescopic optics. A novel method, designated 'stressed lap polishing', has been developed to address these problems.

Paper Details

Date Published: 1 July 1990
PDF: 5 pages
Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, (1 July 1990); doi: 10.1117/12.19273
Show Author Affiliations
James Roger P. Angel, Steward Observatory/Univ. of Arizona (United States)
Warren B. Davison, Steward Observatory/Univ. of Arizona (United States)
John M. Hill, Steward Observatory/Univ. of Arizona (United States)
Edward J. Mannery, Steward Observatory/Univ. of Arizona (United States)
Hubert M. Martin, Steward Observatory/Univ. of Arizona (United States)


Published in SPIE Proceedings Vol. 1236:
Advanced Technology Optical Telescopes IV
Lawrence D. Barr, Editor(s)

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