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Proceedings Paper

Manufacture of a 2-m mirror with a glass membrane facesheet and active rigid support
Author(s): James H. Burge; Brian Cuerden; Stephen M. Miller III; Robert C. Crawford; Helmuth H. Dorth; David G. Sandler; Richard W. Wortley
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Paper Abstract

A 2-m diameter mirror is being manufactured as a demonstration for NASA's Next Generation Space Telescope (NGST). This mirror meets the challenging requirements of cryogenic operation and very low mass using an active control system. The mirror system consists of an aluminized glass membrane, 2 mm thick. This membrane is supported and controlled based on wavefront measurements with 169 remotely driven actuators. The system rigidity is provided by a lightweight carbon fiber composite structure. This entire mirror system, 2 meters across weighs less than 40 kg, and will demonstrate 20 nm surface quality in a cryogenic test facility at 35 K.

Paper Details

Date Published: 11 November 1999
PDF: 11 pages
Proc. SPIE 3782, Optical Manufacturing and Testing III, (11 November 1999); doi: 10.1117/12.369178
Show Author Affiliations
James H. Burge, Optical Sciences Ctr./Univ. of Arizona and Steward Observatory/Univ. of Arizona (United States)
Brian Cuerden, Steward Observatory/Univ. of Arizona (United States)
Stephen M. Miller III, Steward Observatory/Univ. of Arizona (United States)
Robert C. Crawford, Optical Sciences Ctr./Univ. of Arizona (United States)
Helmuth H. Dorth, Composite Optics, Inc. (United States)
David G. Sandler, ThermoTrex Corp. (United States)
Richard W. Wortley, Hextek Corp. (United States)

Published in SPIE Proceedings Vol. 3782:
Optical Manufacturing and Testing III
H. Philip Stahl, Editor(s)

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