Manufacture of a 1.7 m prototype of the GMT primary mirror segments

H. M. Martin, James H Burge, S. M. Miller, B. K. Smith, R. Zehnder, C. Zhao

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

19 Citations (Scopus)

Abstract

We have nearly completed the manufacture of a 1.7 m off-axis mirror as part of the technology development for the Giant Magellan Telescope. The mirror is an off-axis section of a 5.3 m f/0.73 parent paraboloid, making it roughly a 1:5 model of the outer 8.4 m GMT segment. The 1.7 m mirror will be the primary mirror of the New Solar Telescope at Big Bear Solar Observatory. It has a 2.7 mm peak-to-valley departure from the best-fit sphere, presenting a serious challenge in terms of both polishing and measurement. The mirror was polished with a stressed lap, which bends actively to match the local curvature at each point on the mirror surface, and works for asymmetric mirrors as well as symmetric aspheres. It was measured using a hybrid reflective-diffractive null corrector to compensate for the mirror's asphericity. Both techniques will be applied in scaled-up versions to the GMT segments.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Volume6273 I
DOIs
StatePublished - 2006
EventOptomechanical Technologies for Astronomy - Orlando, FL, United States
Duration: May 24 2006May 31 2006

Other

OtherOptomechanical Technologies for Astronomy
CountryUnited States
CityOrlando, FL
Period5/24/065/31/06

Fingerprint

Mirrors
prototypes
mirrors
Telescopes
telescopes
aspheric optics
asphericity
solar observatories
Observatories
Polishing
bears
polishing
valleys
curvature

Keywords

  • Aspheres
  • Optical fabrication
  • Optical testing
  • Telescopes

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Martin, H. M., Burge, J. H., Miller, S. M., Smith, B. K., Zehnder, R., & Zhao, C. (2006). Manufacture of a 1.7 m prototype of the GMT primary mirror segments. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 6273 I). [62730G] https://doi.org/10.1117/12.672105

Manufacture of a 1.7 m prototype of the GMT primary mirror segments. / Martin, H. M.; Burge, James H; Miller, S. M.; Smith, B. K.; Zehnder, R.; Zhao, C.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 6273 I 2006. 62730G.

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

Martin, HM, Burge, JH, Miller, SM, Smith, BK, Zehnder, R & Zhao, C 2006, Manufacture of a 1.7 m prototype of the GMT primary mirror segments. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 6273 I, 62730G, Optomechanical Technologies for Astronomy, Orlando, FL, United States, 5/24/06. https://doi.org/10.1117/12.672105
Martin HM, Burge JH, Miller SM, Smith BK, Zehnder R, Zhao C. Manufacture of a 1.7 m prototype of the GMT primary mirror segments. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 6273 I. 2006. 62730G https://doi.org/10.1117/12.672105
Martin, H. M. ; Burge, James H ; Miller, S. M. ; Smith, B. K. ; Zehnder, R. ; Zhao, C. / Manufacture of a 1.7 m prototype of the GMT primary mirror segments. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 6273 I 2006.
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