A Caltech Library Service

Adaptive optics sky coverage modeling for extremely large telescopes

Clare, Richard M. and Ellerbroek, Brent L. and Herriot, Glen and Véran, Jean-Pierre (2006) Adaptive optics sky coverage modeling for extremely large telescopes. Applied Optics, 45 (35). pp. 8964-8988. ISSN 0003-6935.

See Usage Policy.


Use this Persistent URL to link to this item:


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.

Item Type:Article
Related URLs:
URLURL TypeDescription
Additional Information:© 2006 Optical Society of America Received 12 May 2006; revised 4 August 2006; accepted 11 August 2006; posted 11 August 2006 (Doc. ID 70899). The authors acknowledge the support of the TMT partner institutions. They are the Association of Canadian Universities for Research in Astronomy (ACURA), the Association of Universities for Research in Astronomy (AURA), the California Institute of Technology, and the University of California. This work was also supported by the Canada Foundation for Innovation; the Gordon and Betty Moore Foundation; the National Optical Astronomy Observatory, which is operated by AURA under cooperative agreement with the National Science Foundation; the Ontario Ministry of Research and Innovation; the National Research Council of Canada; and the National Science Foundation Science and Technology Center for Adaptive Optics, managed by the University of California at Santa Cruz under cooperative agreement AST-9876783.
Subject Keywords:Wave-front sensing
Issue or Number:35
Record Number:CaltechAUTHORS:CLAao06
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6856
Deposited By: Archive Administrator
Deposited On:29 Dec 2006
Last Modified:02 Oct 2019 23:36

Repository Staff Only: item control page