Design of the first generation wave front sensor and actuator geometry for the 6.5 m MMT adaptive-optical system

Troy A. Rhoadarmer, Patrick C. McGuire, Michael Lloyd-Hart, James Roger P. Angel, Brian Cuerden, Bruce C. Fitz-Patrick, David G. Sandler

Research output: Contribution to journalConference articlepeer-review


A description is given for the geometry of the first generation adaptive-optical (AO) system being developed for the 6.5m single-mirror telescope that will replace the Multiple Mirror Telescope on Mt. Hopkins. The AO system consists of an adaptive secondary mirror with 330-actuators and a wave front senor composed of a 13 by 13 square subaperture array. The deformable mirror actuator vibrational modes were determined from a finite element model of the adaptive-secondary mirror. Numerical simulations in based on the finite element results were carried out to determine the expected performance of the system. Two reconstruction algorithms were compared - a least squares reconstructor and a modal equalization technique developed for this AO geometry. Strehl ratios are reported for the two algorithms for various guide star magnitudes and number of corrected wave front modes.

Original languageEnglish (US)
Pages (from-to)579-590
Number of pages12
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 1998
EventAdaptive Optical System Technologies - Kona, HI, United States
Duration: Mar 23 1998Mar 23 1998


  • Adaptive optics
  • Adaptive secondary
  • Deformable mirrors
  • Influence functions
  • Wave front sensors

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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