Laser tracker surface measurements of the 8.4 m GMT primary mirror segment

Tom L. Zobrist, James H. Burge, Hubert M. Martin

Research output: Chapter in Book/Report/Conference proceedingConference contribution

23 Scopus citations


We have developed a metrology system that is capable of measuring rough ground and polished surfaces alike, is nearly independent of the nominal surface shape, and can accommodate surfaces up to 8.4 m in diameter. The system couples a commercial laser tracker with an advanced calibration technique and a system of external references. This system was built to guide loose abrasive grinding and initial polishing of the off-axis primary mirror segments for the Giant Magellan Telescope, and will be used to guide the fabrication of the Large Synoptic Survey Telescope primary and tertiary mirrors as well. The results obtained using this system during the fabrication of the first segment of the Giant Magellan Telescope are presented along with an assessment of the expected system accuracy.

Original languageEnglish (US)
Title of host publicationOptical Manufacturing and Testing VIII
StatePublished - 2009
Externally publishedYes
EventOptical Manufacturing and Testing VIII - San Diego, CA, United States
Duration: Aug 4 2009Aug 5 2009

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherOptical Manufacturing and Testing VIII
Country/TerritoryUnited States
CitySan Diego, CA


  • Aspheres
  • Laser metrology
  • Optical fabrication
  • Optical testing
  • Telescopes

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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