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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 22 — Oct. 26, 2009
  • pp: 20575–20583

Comparison of wavefront sensor models for simulation of adaptive optics

Zhiwen Wu, Anita Enmark, Mette Owner-Petersen, and Torben Andersen  »View Author Affiliations


Optics Express, Vol. 17, Issue 22, pp. 20575-20583 (2009)
http://dx.doi.org/10.1364/OE.17.020575


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Abstract

The new generation of extremely large telescopes will have adaptive optics. Due to the complexity and cost of such systems, it is important to simulate their performance before construction. Most systems planned will have Shack-Hartmann wavefront sensors. Different mathematical models are available for simulation of such wavefront sensors. The choice of wavefront sensor model strongly influences computation time and simulation accuracy. We have studied the influence of three wavefront sensor models on performance calculations for a generic, adaptive optics (AO) system designed for K-band operation of a 42 m telescope. The performance of this AO system has been investigated both for reduced wavelengths and for reduced r0 in the K band. The telescope AO system was designed for K-band operation, that is both the subaperture size and the actuator pitch were matched to a fixed value of r0 in the K-band. We find that under certain conditions, such as investigating limiting guide star magnitude for large Strehl-ratios, a full model based on Fraunhofer propagation to the subimages is significantly more accurate. It does however require long computation times. The shortcomings of simpler models based on either direct use of average wavefront tilt over the subapertures for actuator control, or use of the average tilt to move a precalculated point spread function in the subimages are most pronounced for studies of system limitations to operating parameter variations. In the long run, efficient parallelization techniques may be developed to overcome the problem.

© 2009 OSA

OCIS Codes
(010.1080) Atmospheric and oceanic optics : Active or adaptive optics
(350.1260) Other areas of optics : Astronomical optics
(010.1285) Atmospheric and oceanic optics : Atmospheric correction

ToC Category:
Adaptive Optics

History
Original Manuscript: July 29, 2009
Revised Manuscript: September 28, 2009
Manuscript Accepted: September 28, 2009
Published: October 23, 2009

Citation
Zhiwen Wu, Anita Enmark, Mette Owner-Petersen, and Torben Andersen, "Comparison of wavefront sensor models for simulation of adaptive optics," Opt. Express 17, 20575-20583 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-22-20575


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