Active optics and wavefront sensing at the upgraded 6.5-meter MMT

T. E. Pickering, S. C. West, D. G. Fabricant

Research output: Contribution to journalConference articlepeer-review

14 Scopus citations


Shack-Hartmann wavefront sensors have been commissioned and are now in routine use at both of the optical foci (f/9 and f/5) of the converted MMT. Both units are of moderate resolution with 14 × 14 square apertures across the pupil for f/5 and 13 ×13 hexagonal apertures for f/9. They share a common software interface that fits a set of 19 Zernike polynomials to the wavefront errors. Zernike focus and coma are corrected by moving the secondary mirror, third order spherical by a combination of secondary motion and primary bending, and the rest by primary bending alone. In this paper we will describe the two wavefront sensor systems and how they have performed thus far.

Original languageEnglish (US)
Pages (from-to)1041-1051
Number of pages11
JournalProceedings of SPIE - The International Society for Optical Engineering
Issue numberPART 2
StatePublished - 2004
Externally publishedYes
EventGround-based Telescopes - Glasgow, United Kingdom
Duration: Jun 21 2004Jun 25 2004


  • Active
  • Large
  • Shack-
  • Wavefront

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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