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Proceedings Paper

Anisoplanatism effects on diffraction-based performance calculations in adaptive optical systems
Author(s): Steven E. Troxel; Byron M. Welsh; Michael C. Roggemann
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Paper Abstract

The effects of turbulence-induced anisoplanatism cause the performance of an adaptive optic system to be dependent on the angular separation between the object wavefront being corrected and the wavefront of the reference source. One method of quantifying this angular dependent performance is through the average optical transfer function (OTF). An equally important measure is the variance of the OTF. The variance is used together with the average OTF to define a signal-to-noise ratio (SNR). Knowledge of the SNR is essential in any image restoration scheme to determine the spatial frequency limit of the restoration process. This paper presents the diffraction based theory and a method of computing the object angle dependent average OTF and corresponding SNR of an adaptive-optics system. These quantities are computed using normalized correction functions that are valid for a wide range of atmospheric turbulence profiles and angular correction geometries. This method allows for rapid calculations under changing atmospheric and geometric conditions.

Paper Details

Date Published: 31 May 1994
PDF: 12 pages
Proc. SPIE 2201, Adaptive Optics in Astronomy, (31 May 1994); doi: 10.1117/12.176041
Show Author Affiliations
Steven E. Troxel, Air Force Institute of Technology (United States)
Byron M. Welsh, Air Force Institute of Technology (United States)
Michael C. Roggemann, Air Force Institute of Technology (United States)

Published in SPIE Proceedings Vol. 2201:
Adaptive Optics in Astronomy
Mark A. Ealey; Fritz Merkle, Editor(s)

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