Final prototype design for the adaptive secondary mirror of the 6.5-m MMT

D. G. Bruns, T. K. Barrett, T. J. Brinkley, D. Goyena, D. G. Sandler, H. M. Martin, G. Brusa, J. R.P. Angel

Research output: Contribution to journalConference articlepeer-review

5 Scopus citations


The upgraded 6.5 m MMT in AZ will use an adaptive secondary to optimize performance in the near infrared spectral region. The secondary mirror is a 2 mm thick, 640 mm diameter Zerodur shell suspended only by a flexible center hub. Three hundred voice coil actuators installed in an aluminum reference surface deform the shell according to commands from a wavefront sensor. Capacitor position sensors surrounding each actuator provide feedback in an inner servo loop, much faster than the exterior wavefront sensor control bandwidth. A 60 actuator prototype, nearly identical to the final adaptive secondary size, has been built and is currently being tested.

Original languageEnglish (US)
Pages (from-to)164-172
Number of pages9
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 1997
EventAdaptive Optics and Applications - San Diego, CA, United States
Duration: Jul 30 1997Aug 1 1997


  • Actuators
  • Adaptive optics
  • Adaptive secondary
  • Capacitor sensors
  • Control systems
  • MMT

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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