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, J. 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

26 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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