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Proceedings Paper

Polishing of a 6.5-m f/1.25 mirror for the first Magellan telescope
Author(s): Hubert M. Martin; R. G. Allen; James H. Burge; Lee R. Dettmann; Dean A. Ketelsen; W. Cary Kittrell; Stephen M. Miller
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Paper Abstract

We describe the optical fabrication and testing of the 6.5 m f/1.25 primary mirror for the first Magellan telescope. Figuring was performed with a 1.2m stressed lap, which bends under active control to match the local curvature of the optical surface, and a variety of small passive tools. The figure was measured with RI and visible interferometers, using refractive null correctors to compensate 810 microns of aspheric departure. After subtraction of Seidel astigmatism and spherical aberration, the finished mirror is accurate to 14 nm rms surface error, and has an encircled energy of 80 percent in 0.06 inch diameter at 500 nm.

Paper Details

Date Published: 6 September 1999
PDF: 9 pages
Proc. SPIE 3739, Optical Fabrication and Testing, (6 September 1999); doi: 10.1117/12.360161
Show Author Affiliations
Hubert M. Martin, Steward Observatory/Univ. of Arizona (United States)
R. G. Allen, Steward Observatory/Univ. of Arizona (United States)
James H. Burge, Steward Observatory/Univ. of Arizona (United States)
Lee R. Dettmann, Steward Observatory/Univ. of Arizona (United States)
Dean A. Ketelsen, Steward Observatory/Univ. of Arizona (United States)
W. Cary Kittrell, Steward Observatory/Univ. of Arizona (United States)
Stephen M. Miller, Steward Observatory/Univ. of Arizona (United States)


Published in SPIE Proceedings Vol. 3739:
Optical Fabrication and Testing
Roland Geyl; Jonathan Maxwell, Editor(s)

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