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Proceedings Paper

Initial performance of the Keck AO wavefront controller system
Author(s): Erik M. Johansson; D. Scott Acton; Jong R. An; Kenneth Avicola; Barton V. Beeman; James M. Brase; Carmen J. Carrano; John Gathright; Donald T. Gavel; Randall L. Hurd; Olivier Lai; William Lupton; Bruce A. Macintosh; Claire E. Max; Scot S. Olivier; J. C. Shelton; Paul J. Stomski Jr.; Kevin Tsubota; Kenneth E. Waltjen; James A. Watson; Peter L. Wizinowich
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Paper Abstract

The wavefront controller for the Keck Observatory AO system consists of two separate real-time control loops: a tip-tilt control loop to remove tilt from the incoming wavefront, and a deformable mirror control loop to remove higher-order aberrations. In this paper, we describe these control loops and analyze their performance using diagnostic data acquired during the integration and testing of the AO system on the telescope. Disturbance rejection curves for the controllers are calculated from the experimental data and compared to theory. The residual wavefront errors due to control loop bandwidth are also calculated from the data, and possible improvements to the controller performance are discussed.

Paper Details

Date Published: 7 July 2000
PDF: 8 pages
Proc. SPIE 4007, Adaptive Optical Systems Technology, (7 July 2000); doi: 10.1117/12.390320
Show Author Affiliations
Erik M. Johansson, Lawrence Livermore National Lab. (United States)
D. Scott Acton, W.M. Keck Observatory (United States)
Jong R. An, Lawrence Livermore National Lab. (United States)
Kenneth Avicola, Lawrence Livermore National Lab. (United States)
Barton V. Beeman, Lawrence Livermore National Lab. (United States)
James M. Brase, Lawrence Livermore National Lab. (United States)
Carmen J. Carrano, Lawrence Livermore National Lab. (United States)
John Gathright, W.M. Keck Observatory (United States)
Donald T. Gavel, Lawrence Livermore National Lab. (United States)
Randall L. Hurd, Lawrence Livermore National Lab. (United States)
Olivier Lai, Canada-France-Hawaii Telescope Corp. (United States)
William Lupton, W.M. Keck Observatory (United States)
Bruce A. Macintosh, Lawrence Livermore National Lab. (United States)
Claire E. Max, Lawrence Livermore National Lab. (United States)
Scot S. Olivier, Lawrence Livermore National Lab. (United States)
J. C. Shelton, Carpe Photon (United States)
Paul J. Stomski Jr., W.M. Keck Observatory (United States)
Kevin Tsubota, W.M. Keck Observatory (United States)
Kenneth E. Waltjen, Lawrence Livermore National Lab. (United States)
James A. Watson, Lawrence Livermore National Lab. (United States)
Peter L. Wizinowich, W.M. Keck Observatory (United States)


Published in SPIE Proceedings Vol. 4007:
Adaptive Optical Systems Technology
Peter L. Wizinowich, Editor(s)

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