Fabrication of mirrors for the Magellan telescopes and the large binocular telescope

H. M. Martin, R. G. Allen, James H Burge, L. R. Dettmann, D. A. Ketelsen, S. M. Miller, Jose M Sasian

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

31 Citations (Scopus)

Abstract

We describe the fabrication and testing of the 6.5 m f/1.25 primary mirrors for the Magellan telescopes and the 8.4 m f/1.14 primary mirrors for the Large Binocular Telescope (LET). These mirrors, along with the 6.5 m MMT primary, are the fastest and most aspheric large mirrors made. Steward Observatory developed special methods to polish and measure these and other, fast mirrors. We use a stressed-lap polishing tool to fit the aspheric surface while providing strong passive smoothing, and computer-generated holograms to verify the measurement of up to 1.4 mm peak-to-valley asphericity to an accuracy of 0.01%. The Magellan mirrors are diffraction-limited at visible wavelengths, with surface accuracies of about 20 nm rms on active supports. We are currently polishing the first LET primary mirror and preparing to make the thin shells for the LET adaptive secondary mirrors.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsJ.M. Oschmann, L.M. Stepp
Pages609-618
Number of pages10
Volume4837
Edition2
DOIs
StatePublished - 2002
EventLarge Ground-based Telescopes - Waikoloa, HI, United States
Duration: Aug 22 2002Aug 26 2002

Other

OtherLarge Ground-based Telescopes
CountryUnited States
CityWaikoloa, HI
Period8/22/028/26/02

Fingerprint

Binoculars
Telescopes
telescopes
mirrors
Fabrication
fabrication
Polishing
Holograms
Observatories
polishing
Mirrors
Diffraction
asphericity
Wavelength
Testing
smoothing
valleys
observatories

Keywords

  • Aspheres
  • Optical fabrication
  • Optical testing
  • Telescopes

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Martin, H. M., Allen, R. G., Burge, J. H., Dettmann, L. R., Ketelsen, D. A., Miller, S. M., & Sasian, J. M. (2002). Fabrication of mirrors for the Magellan telescopes and the large binocular telescope. In J. M. Oschmann, & L. M. Stepp (Eds.), Proceedings of SPIE - The International Society for Optical Engineering (2 ed., Vol. 4837, pp. 609-618) https://doi.org/10.1117/12.458606

Fabrication of mirrors for the Magellan telescopes and the large binocular telescope. / Martin, H. M.; Allen, R. G.; Burge, James H; Dettmann, L. R.; Ketelsen, D. A.; Miller, S. M.; Sasian, Jose M.

Proceedings of SPIE - The International Society for Optical Engineering. ed. / J.M. Oschmann; L.M. Stepp. Vol. 4837 2. ed. 2002. p. 609-618.

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

Martin, HM, Allen, RG, Burge, JH, Dettmann, LR, Ketelsen, DA, Miller, SM & Sasian, JM 2002, Fabrication of mirrors for the Magellan telescopes and the large binocular telescope. in JM Oschmann & LM Stepp (eds), Proceedings of SPIE - The International Society for Optical Engineering. 2 edn, vol. 4837, pp. 609-618, Large Ground-based Telescopes, Waikoloa, HI, United States, 8/22/02. https://doi.org/10.1117/12.458606
Martin HM, Allen RG, Burge JH, Dettmann LR, Ketelsen DA, Miller SM et al. Fabrication of mirrors for the Magellan telescopes and the large binocular telescope. In Oschmann JM, Stepp LM, editors, Proceedings of SPIE - The International Society for Optical Engineering. 2 ed. Vol. 4837. 2002. p. 609-618 https://doi.org/10.1117/12.458606
Martin, H. M. ; Allen, R. G. ; Burge, James H ; Dettmann, L. R. ; Ketelsen, D. A. ; Miller, S. M. ; Sasian, Jose M. / Fabrication of mirrors for the Magellan telescopes and the large binocular telescope. Proceedings of SPIE - The International Society for Optical Engineering. editor / J.M. Oschmann ; L.M. Stepp. Vol. 4837 2. ed. 2002. pp. 609-618
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