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Proceedings Article

Progress in the stressed-lap polishing of a 1.8-m f/1 mirror

[+] Author Affiliations
Hubert M. Martin, David S. Anderson, James Roger P. Angel, Robert H. Nagel, Steve C. West, R. S. Young

Steward Observatory/Univ. of Arizona (USA)

Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, 682 (July 1, 1990); doi:10.1117/12.19235
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From Conference Volume 1236

  • Advanced Technology Optical Telescopes IV
  • Lawrence D. Barr
  • Tucson, AZ | February 11, 1990

abstract

We are in the process of polishing a 1.8-rn f/i ellipsoid with an actively stressed lap. As a preliminary exercise, we have polished the mirror as a sphere using a rigid subdiameter lap. The overall surface error was 25 nm rms, and the surface met a specification corresponding to i/8-arcsec image quality. A stressed lap 600 mm in diameter was designed and built to polish the mirror as an f/i ellipsoid. It consists of an aluminum disk which changes shape continuously under the influence of 12 moment-generating actuators. These actuators are programmed to produce the shape changes necessary to make the lap fit the mirror surface as it moves across that surface and rotates. In this paper we describe the principles and design of the lap, test results, and progress to date in polishing the 1.8-rn mirror.

© (1990) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Hubert M. Martin ; David S. Anderson ; James Roger P. Angel ; Robert H. Nagel ; Steve C. West, et al.
"Progress in the stressed-lap polishing of a 1.8-m f/1 mirror", Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, 682 (July 1, 1990); doi:10.1117/12.19235; http://dx.doi.org/10.1117/12.19235


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