A new concept for large deformable mirrors for extremely large telescopes

Torben Andersen, Mette Owner-Petersen, Arne Ardeberg, T Korhonen

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceedingpeer-review

Abstract

For extremely large telescopes, there is strong need for thin deformable mirrors in the 3-4 m class. So far, feasibility of such mirrors has not been demonstrated. Extrapolation from existing techniques suggests that the mirrors could be highly expensive. We give a progress report on a study of an approach for construction of large deformable mirrors with a moderate cost. We have developed low-cost actuators and deflection sensors that can absorb mounting tolerances in the millimeter range, and we have tested prototypes in the laboratory. Studies of control laws for mirrors with thousands of sensors and actuators are in good progress and simulations have been carried out. Manufacturing of thin, glass mirror blanks is being studied and first prototypes have been produced by a slumping technique. Development of polishing procedures for thin mirrors is in progress
Original languageEnglish
Title of host publicationProceedings of the SPIE - The International Society for Optical Engineering
PublisherSPIE
PagesU324-U331
Volume6272
DOIs
Publication statusPublished - 2006
Event Astronomical Telescopes and Instrumentation - Advances in Adaptive Optics II, 2006 - Orlando, FL, United States
Duration: 2006 May 242006 May 31

Publication series

Name
Number1
Volume6272
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

Conference Astronomical Telescopes and Instrumentation - Advances in Adaptive Optics II, 2006
Country/TerritoryUnited States
CityOrlando, FL
Period2006/05/242006/05/31

Subject classification (UKÄ)

  • Astronomy, Astrophysics and Cosmology

Keywords

  • glass mirror
  • slumping technique
  • mounting tolerance
  • deflection sensor
  • low-cost actuator
  • extrapolation
  • extremely large telescope
  • large deformable mirror
  • adaptive optics
  • telescope
  • 3 to 4 m
  • polishing

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