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Proceedings Paper

Measurement error of a Shack-Hartmann wavefront sensor in strong scintillation conditions
Author(s): Mark L. Plett; Pierre R. Barbier; David W. Rush; Penelope Polak-Dingels; Bruce Martin Levine
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Paper Abstract

Adaptive optics can be used to improve the performance of optical wireless communications links degraded by atmospheric turbulence. Accurate wavefront sensing is necessary for some adaptive optics systems to compensate for the effects of atmospheric turbulence. Although the Shack- Hartmann sensor can provide accurate wavefront sensing under controlled conditions, scintillation can restrict the performance of Shack-Hartmann wavefront sensing by creating large intensity fluctuations. These intensity fluctuations can create errors in the wavefront measurement if the intensity dynamic range of the Shack-Hartmann sensor is exceeded. The result of computer simulations which model the performance of the Shack-Hartmann wavefront sensor are presented. Specifically it is shown that the intensity dynamic range of the Shack-Hartmann wavefront sensor can be increased by operating with saturated pixels without an increase in error in the measured wavefront. Operating conditions that maximize the intensity dynamic range of the Shack-Hartmann senor are presented. Experimental results are presented which support the results of the computer simulation.

Paper Details

Date Published: 3 November 1998
PDF: 10 pages
Proc. SPIE 3433, Propagation and Imaging through the Atmosphere II, (3 November 1998); doi: 10.1117/12.330219
Show Author Affiliations
Mark L. Plett, Univ. of Maryland/College Park (United States)
Pierre R. Barbier, Univ. of Maryland/College Park (United States)
David W. Rush, Univ. of Maryland/College Park (United States)
Penelope Polak-Dingels, Univ. of Maryland/College Park (United States)
Bruce Martin Levine, Adaptive Optics Associates, Inc. (United States)


Published in SPIE Proceedings Vol. 3433:
Propagation and Imaging through the Atmosphere II
Luc R. Bissonnette, Editor(s)

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