Tilt anisoplanatism in laser-guide-star-based multiconjugate adaptive optics. Reconstruction of the long exposure point spread function from control loop data

Ralf Flicker, F J Rigaut, B L Ellerbroek

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Abstract

A method is presented for estimating the long exposure point spreadfunction (PSF) degradation due to tilt anisoplanatism in alaser-guide-star-based multiconjugate adaptive optics systems fromcontrol loop data. The algorithm is tested in numerical Monte Carlosimulations of the separately driven low-order null-mode system, and isshown to be robust and accurate with less than 10 relative error inboth H and K bands down to a natural guide star (NGS) magnitude ofmR=21, for a symmetric asterism with three NGS on a 30 arcsec radius.The H band limiting magnitude of the null-mode system due to NGSsignal-to-noise ratio and servo-lag was estimated previously to mR=19.At this magnitude, the relative errors in the reconstructed PSF andStrehl are here found to be less than 5 and 1, suggesting that the PSFretrieval algorithm will be applicable and reliable for the full rangeof operating conditions of the null-mode system.
Original languageEnglish
Pages (from-to)1199-1207
JournalAstronomy & Astrophysics
Volume400
Issue number3
DOIs
Publication statusPublished - 2003

Subject classification (UKÄ)

  • Astronomy, Astrophysics and Cosmology

Keywords

  • Instrumentation
  • adaptive optics
  • methods
  • statistical

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