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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 45, Iss. 35 — Dec. 10, 2006
  • pp: 8964–8978

Adaptive optics sky coverage modeling for extremely large telescopes

Richard M. Clare, Brent L. Ellerbroek, Glen Herriot, and Jean-Pierre Véran  »View Author Affiliations


Applied Optics, Vol. 45, Issue 35, pp. 8964-8978 (2006)
http://dx.doi.org/10.1364/AO.45.008964


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Abstract

A Monte Carlo sky coverage model for laser guide star adaptive optics systems was proposed by Clare and Ellerbroek [J. Opt. Soc. Am. A 23, 418 (2006)]. We refine the model to include (i) natural guide star (NGS) statistics using published star count models, (ii) noise on the NGS measurements, (iii) the effect of telescope wind shake, (iv) a model for how the Strehl and hence NGS wavefront sensor measurement noise varies across the field, (v) the focus error due to imperfectly tracking the range to the sodium layer, (vi) the mechanical bandwidths of the tip–tilt (TT) stage and deformable mirror actuators, and (vii) temporal filtering of the NGS measurements to balance errors due to noise and servo lag. From this model, we are able to generate a TT error budget for the Thirty Meter Telescope facility narrow-field infrared adaptive optics system (NFIRAOS) and perform several design trade studies. With the current NFIRAOS design, the median TT error at the galactic pole with median seeing is calculated to be 65   nm or 1.8 mas rms.

© 2006 Optical Society of America

OCIS Codes
(010.7350) Atmospheric and oceanic optics : Wave-front sensing

History
Original Manuscript: May 12, 2006
Revised Manuscript: August 4, 2006
Manuscript Accepted: August 11, 2006

Citation
Richard M. Clare, Brent L. Ellerbroek, Glen Herriot, and Jean-Pierre Véran, "Adaptive optics sky coverage modeling for extremely large telescopes," Appl. Opt. 45, 8964-8978 (2006)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-45-35-8964


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