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Lego Figure holding a lego telescope. Photo

Arne Ardeberg

Professor emeritus

Lego Figure holding a lego telescope. Photo

From Euro50 towards a European ELT

Author

  • Arne Ardeberg
  • Torben Andersen
  • Jacques Beckers
  • Michael Browne
  • Anita Enmark
  • Per Knutsson
  • Mette Owner-Petersen

Summary, in English

With Euro50 as a convenient telescope laboratory, the Euro50 team has continued development aiming at a European extremely large telescope (ELT). Here, we give a progress report. The needs of science and instrumentation are briefly discussed as is the importance of photometric stability and precision. Results are reported from work on integrated modelling. Details are given concerning point-spread functions (PSFs) obtained with and without adaptive optics (AO). Our results are rather encouraging concerning AO photometry and compensation of edge sensor noise as well as regarding seeing-limited ELT operation. The current status of our development of large deformable mirrors is shown. Low-cost actuators and deflection sensors have been developed as have hierarchic control algorithms. Fabrication of large thin mirror blanks as well as polishing and handling of thin mirrors has been studied experimentally. Regarding adaptive optics, we discuss differential refraction and the limitations imposed by dispersive optical path differences (OPDs) and dispersive anisoplanatism. We report on progress in laser guide star (LGS) performance and a real-time online experiment in multi-conjugate AO (MCAO). We discuss ELTs, high-resolution spectroscopy and pupil slicing with and without use of AO. Finally, we present some recent studies of ELT enclosure options.

Department/s

  • Lund Observatory

Publishing year

2006

Language

English

Pages

26725-26725

Publication/Series

Proceedings of SPIE - The International Society for Optical Engineering

Volume

6267 II

Document type

Conference paper

Publisher

International Society for Optical Engineering

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

  • Hierarchic control
  • Laser guide star (LGS)
  • Optical path differences (OPD)
  • Differential refraction
  • Point spread function (PSF)
  • Extremely large telescope (ELT)
  • Edge sensors

Conference name

Ground-based and Airborne Telescopes

Conference date

2006-05-24 - 2006-05-31

Conference place

Orlando, FL, United States

Status

Published

ISBN/ISSN/Other

  • ISSN: 1996-756X
  • ISSN: 0277-786X