Progress report on the optical system for closed-loop testing of the Multiple Mirror Telescope adaptive secondary mirror

Roland J. Sarlot, Cynthia J. Bresloff, James H. Burge, Bruce C. Fitz-Patrick, Patrick C. McGuire, Brian L. Stamper, Chun Yu Zhao

Research output: Contribution to journalConference article

5 Scopus citations


Steward Observatory is completing the manufacture of a deformable f/15 secondary mirror for the 6.5 m Multiple Mirror Telescope conversion that will, along with the wavefront sensing system, compensate for atmospheric turbulence. A potential difficulty of an adaptive secondary mirror is the ability to verify the commanded mirror shapes of a large convex deformable surface. An optical design is presently being implemented to test the deformable mirror's closed loop control system by optically projecting an artificial star to simulate starlight in the actual telescope. The test system has been designed to verify the control system by fitting into both a laboratory test structure as well as the telescope support structure itself. The optical design relies on two wavelength computer generated holograms used to remove spherical aberration as well as aid in the alignment of the test system optics by projecting alignment patterns.

Original languageEnglish (US)
Pages (from-to)110-117
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - Dec 1 1999
EventProceedings of the 1999 Current Developments in Optical Design and Optical Engineering VIII - Denver, CO, USA
Duration: Jul 19 1999Jul 21 1999


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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