Initial performance of the Keck AO wavefront controller system

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

doi:10.1117/12.390320

7 July 2000 Initial performance of the Keck AO wavefront controller system

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

Author Affiliations +

Proceedings Volume 4007, Adaptive Optical Systems Technology; (2000) https://doi.org/10.1117/12.390320
Event: Astronomical Telescopes and Instrumentation, 2000, Munich, Germany

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.

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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, and Peter L. Wizinowich "Initial performance of the Keck AO wavefront controller system", Proc. SPIE 4007, Adaptive Optical Systems Technology, (7 July 2000); https://doi.org/10.1117/12.390320

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