6 February 2004 Closed-loop adaptive optic comparison between a Shack-Hartmann and a distorted-grating wavefront sensor
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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.
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Paul Harrison, Gavin R. G. Erry, Leonard John Otten, D. M. Cuevas, Lawrence D. Weaver, "Closed-loop adaptive optic comparison between a Shack-Hartmann and a distorted-grating wavefront sensor", Proc. SPIE 5237, Optics in Atmospheric Propagation and Adaptive Systems VI, (6 February 2004); doi: 10.1117/12.515722; http://dx.doi.org/10.1117/12.515722
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KEYWORDS
Wavefronts

Wavefront sensors

Actuators

Sensors

Adaptive optics

Scintillation

Mirrors

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