Stressed-lap polishing of 3.5-m f/1.5 and 1.8-m f/1.0 mirrors

D. S. Anderson, J. R.P. Angel, James H Burge, W. B. Davison, S. T. Derigne, B. B. Hille, D. A. Ketelsen, W. C. Kittrell, H. M. Martin, R. H. Nagel, T. J. Trebisky, S. C. West, R. S. Young

Research output: Contribution to journalConference articlepeer-review

23 Scopus citations


The stressed-lap polishing technique has been developed to meet the challenge of polishing 8-m-class mirrors with highly aspheric figures to an accuracy consistent with the best ground-based telescope sites. The method is currently being demonstrated in the polishing of two primary mirrors, a 1.8-m f/1.0 ellipsoid and a 3.5-m f/1.5 paraboloid. The figure accuracies achieved at the time of writing are 43 nm rms surface error for the 1.8-m mirror, and 190 nm rms surface error for the 3.5-m mirror. Polishing is proceeding on both mirrors. In this paper we describe the process used for the 3.5-m mirror and the progress through the early stages of fabrication. We also summarize progress on the 1.8-m mirror.

Original languageEnglish (US)
Pages (from-to)260-269
Number of pages10
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - Jan 1 1992
EventAdvanced Optical Manufacturing and Testing II 1991 - San Diego, United States
Duration: Jul 21 1991 → …

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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