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Torben Anderssen. Profile picture.

Torben Andersen

Professor emeritus

Torben Anderssen. Profile picture.

Suppressing low-order eigenmodes with local control for deformable mirrors

Author

  • Rikard Heimsten
  • Mette Owner-Petersen
  • Thomas Ruppel
  • Douglas G. MacMynowski
  • Torben Andersen

Summary, in English

To improve the mechanical characteristics of actively controlled continuous faceplate deformable mirrors in adaptive optics, a strategy for reducing crosstalk between adjacent actuators and for suppressing low-order eigenmodes is proposed. The strategy can be seen as extending Saint-Venant's principle beyond the static case, for small local families of actuators. An analytic model is presented, from which we show the feasibility of the local control. Also, we demonstrate how eigenmodes and eigenfrequencies are affected by mirror parameters, such as thickness, diameter, Young's modulus, Poisson's ratio, and density. This analysis is used to evaluate the design strategy for a large deformable mirror, and how many actuators are needed within a family. (c) 2012 Society of Photo-Optical Instrumentation Engineers (SPIE). [DOI: 10.1117/1.OE.51.2.026601]

Department/s

  • Lund Observatory

Publishing year

2012

Language

English

Publication/Series

Optical Engineering

Volume

51

Issue

2

Document type

Journal article

Publisher

SPIE

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

  • distributed control
  • adaptive optics
  • large deformable mirror
  • dimensionless mode analysis

Status

Published

ISBN/ISSN/Other

  • ISSN: 0091-3286