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Proceedings Paper

Atmospheric turbulence sensing for a multiconjugate adaptive optics system
Author(s): Dustin C. Johnston; Byron M. Welsh
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Paper Abstract

Current adaptive optical telescope designs use a single deformable mirror (DM), usually conjugated to the aperture plane, to compensate for the cumulative effects of optical turbulence. The corrected field of view of an adaptive optics system could theoretically be increased through the use of multiple DMs conjugated to a number of corresponding planes which sample the turbulence region in altitude. Control of each DM is via a method for determining the phase distortion contributed by atmospheric layers at the selected altitudes. A theoretical analysis for determining these phase contributions takes advantage of the spatial diversity of wavefront sensor measurements from two or more reference sources. These separate wavefront sensor measurements are processed via minimum mean square error filtering to yield an estimate of the phase perturbation caused by a particular turbulent layer of the atmosphere. Our initial investigation indicates that multiple wavefront corrector adaptive optics systems will require much brighter reference sources than single wavefront corrector systems.

Paper Details

Date Published: 1 December 1991
PDF: 12 pages
Proc. SPIE 1542, Active and Adaptive Optical Systems, (1 December 1991); doi: 10.1117/12.48795
Show Author Affiliations
Dustin C. Johnston, Air Force Institute of Technology (United States)
Byron M. Welsh, Air Force Institute of Technology (United States)

Published in SPIE Proceedings Vol. 1542:
Active and Adaptive Optical Systems
Mark A. Ealey, Editor(s)

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