Volume 400, Number 3, March IV 2003
|Page(s)||1199 - 1207|
|Published online||07 March 2003|
Tilt anisoplanatism in laser-guide-star-based multiconjugate adaptive optics
Reconstruction of the long exposure point spread function from control loop data
Lund Observatory, Box 43, 22100 Lund, Sweden
2 Gemini Observatory, 670 N. A'Ohoku Pl., Hilo HI-96720, USA
Corresponding author: R. C. Flicker, email@example.com
Accepted: 6 January 2003
A method is presented for estimating the long exposure point spread function (PSF) degradation due to tilt anisoplanatism in a laser-guide-star-based multiconjugate adaptive optics systems from control loop data. The algorithm is tested in numerical Monte Carlo simulations of the separately driven low-order null-mode system, and is shown to be robust and accurate with less than 10% relative error in both H and K bands down to a natural guide star (NGS) magnitude of mR=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 NGS signal-to-noise ratio and servo-lag was estimated previously to mR=19. At this magnitude, the relative errors in the reconstructed PSF and Strehl are here found to be less than 5% and 1%, suggesting that the PSF retrieval algorithm will be applicable and reliable for the full range of operating conditions of the null-mode system.
Key words: Instrumentation / adaptive optics / methods / statistical
© ESO, 2003
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