Closed-loop adaptive optic comparison between a Shack-Hartmann and a distorted grating wavefront sensor

Details Closed-loop adaptive optic comparison between a Shack-Hartmann and a distorted grating wavefront sensor Closed-loop adaptive optic comparison between a Shack-Hartmann and a distorted grating wavefront sensor

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004spie.5572..235h&link_type=abstract

Optics in Atmospheric Propagation and Adaptive Systems VII. Edited by Gonglewski, John D.; Stein, Karin. Proceedings of the SP

Physics

Optics

Scientific paper

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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