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Proceedings Paper

Closed-loop adaptive optic comparison between a Shack-Hartmann and a distorted grating wavefront sensor
Author(s): Paul Harrison; Gavin R. G. Erry; Leonard John Otten III; D. M. Cuevas; Lawrence D. Weaver
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Paper Abstract

Earlier research reported a comparison of the wavefronts recorded simultaneously by a Shack-Hartmann and a Distorted Grating Wavefront Sensor (DGWFS). In this paper we present the results of a continuation of this earlier work where we have now closed an adaptive optics loop under simulated propagation conditions using the Advanced Concept Laboratory (ACL) at Lincoln Laboratory. For these measurements only one wavefront sensor controlled the deformable mirror at a time. To make direct comparisons between the sensors we took advantage of the ACL’s ability to exactly replicate a time varying propagation simulation. Time varying and static comparisons of the two sensors controlling the ACL adaptive system under conditions that ranged from a benign path, D/r0 = 2, to a propagation condition with significant scintillation, D/r0 =9, will be shown using the corrected far field spot as a measure of performance. The paper includes a description of the DGWFS used for these tests and describes the procedure used to align and calibrate the sensor.

Paper Details

Date Published: 6 February 2004
PDF: 12 pages
Proc. SPIE 5237, Optics in Atmospheric Propagation and Adaptive Systems VI, (6 February 2004); doi: 10.1117/12.515722
Show Author Affiliations
Paul Harrison, Kestrel Corp. (United States)
Gavin R. G. Erry, Kestrel Corp. (United States)
Leonard John Otten III, Kestrel Corp. (United States)
D. M. Cuevas, Kestrel Corp. (United States)
Lawrence D. Weaver, Air Force Research Lab. (United States)

Published in SPIE Proceedings Vol. 5237:
Optics in Atmospheric Propagation and Adaptive Systems VI
John D. Gonglewski; Karin Stein, Editor(s)

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