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Proceedings Article

Fabrication of large optical surfaces using a combination of polishing and mirror bending

[+] Author Affiliations
Terry S. Mast, Jerry E. Nelson

Univ. of California/Berkeley and Lawrence Berkeley Lab. (USA)

Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, 670 (July 1, 1990); doi:10.1117/12.19234
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From Conference Volume 1236

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

abstract

In order to reduce polishing costs and correct unexpected errors in fabrication and polishing, the support of very large optics can be actively enlisted in telescope mirror optical figure adjustment. A set of leaf springs is used by the Keck Ten-Meter Telescope to apply moments about the pivots of the mirror mosaics' whiffletree support. The springs successfully reduce the polished rms surface error by a factor of 6 to 15, while reducing the 80-percent enclosed energy diameter by a factor of 2.5-6.0. Additional current limitations on figure improvement include the difficulties of polishing higher spatial frequencies and predicting warping during mirror fabrication.

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

Terry S. Mast and Jerry E. Nelson
"Fabrication of large optical surfaces using a combination of polishing and mirror bending", Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, 670 (July 1, 1990); doi:10.1117/12.19234; http://dx.doi.org/10.1117/12.19234


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