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Proceedings Paper

Manufacture of a 1.7m prototype of the GMT primary mirror segments
Author(s): H. M. Martin; J. H. Burge; S. M. Miller; B. K. Smith; R. Zehnder; C. Zhao
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Paper Abstract

We have nearly completed the manufacture of a 1.7 m off-axis mirror as part of the technology development for the Giant Magellan Telescope. The mirror is an off-axis section of a 5.3 m f/0.73 parent paraboloid, making it roughly a 1:5 model of the outer 8.4 m GMT segment. The 1.7 m mirror will be the primary mirror of the New Solar Telescope at Big Bear Solar Observatory. It has a 2.7 mm peak-to-valley departure from the best-fit sphere, presenting a serious challenge in terms of both polishing and measurement. The mirror was polished with a stressed lap, which bends actively to match the local curvature at each point on the mirror surface, and works for asymmetric mirrors as well as symmetric aspheres. It was measured using a hybrid reflective-diffractive null corrector to compensate for the mirror's asphericity. Both techniques will be applied in scaled-up versions to the GMT segments.

Paper Details

Date Published: 6 July 2006
PDF: 11 pages
Proc. SPIE 6273, Optomechanical Technologies for Astronomy, 62730G (6 July 2006); doi: 10.1117/12.672105
Show Author Affiliations
H. M. Martin, Steward Observatory, Univ. of Arizona (United States)
J. H. Burge, Steward Observatory, Univ. of Arizona (United States)
College of Optical Sciences, Univ. of Arizona (United States)
S. M. Miller, Steward Observatory, Univ. of Arizona (United States)
B. K. Smith, Steward Observatory, Univ. of Arizona (United States)
R. Zehnder, College of Optical Sciences, Univ. of Arizona (United States)
C. Zhao, College of Optical Sciences, Univ. of Arizona (United States)


Published in SPIE Proceedings Vol. 6273:
Optomechanical Technologies for Astronomy
Eli Atad-Ettedgui; Joseph Antebi; Dietrich Lemke, Editor(s)

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