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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 8 — Apr. 16, 2007
  • pp: 4711–4725

Modeling low order aberrations in laser guide star adaptive optics systems

Richard M. Clare, Marcos A. van Dam, and Antonin H. Bouchez  »View Author Affiliations


Optics Express, Vol. 15, Issue 8, pp. 4711-4725 (2007)
http://dx.doi.org/10.1364/OE.15.004711


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Abstract

When using a laser guide star (LGS) adaptive optics (AO) system, quasi-static aberrations are observed between the measured wavefronts from the LGS wavefront sensor (WFS) and the natural guide star (NGS) WFS. These LGS aberrations, which can be as much as 1200 nm RMS on the Keck II LGS AO system, arise due to the finite height and structure of the sodium layer. The LGS aberrations vary significantly between nights due to the difference in sodium structure. In this paper, we successfully model these LGS aberrations for the Keck II LGS AO system. We use this model to characterize the LGS aberrations as a function of pupil angle, elevation, sodium structure, uplink tip/tilt error, detector field of view, the number of detector pixels, and seeing. We also employ the model to estimate the LGS aberrations for the Palomar LGS AO system, the planned Keck I and the Thirty Meter Telescope (TMT) LGS AO systems. The LGS aberrations increase with increasing telescope diameter, but are reduced by central projection of the laser compared to side projection.

© 2007 Optical Society of America

OCIS Codes
(010.1080) Atmospheric and oceanic optics : Active or adaptive optics
(010.7350) Atmospheric and oceanic optics : Wave-front sensing

ToC Category:
Adaptive Optics

History
Original Manuscript: January 24, 2007
Revised Manuscript: March 19, 2007
Manuscript Accepted: March 29, 2007
Published: April 3, 2007

Citation
Richard M. Clare, Marcos A. van Dam, and Antonin H. Bouchez, "Modeling low order aberrations in laser guide star adaptive optics systems," Opt. Express 15, 4711-4725 (2007)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-15-8-4711


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References

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