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Proceedings Paper

Experimental validation of optimization concepts for focal-plane image processing with adaptive optics
Author(s): Visa Korkiakoski; Christoph U. Keller; Niek Doelman; Rufus Fraanje; Raluca Andrei; Michel Verhaegen
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Paper Abstract

We show experimental results demonstrating the feasibility of an extremely fast sequential phase-diversity (SPD) algorithm for point sources. The algorithm can be implemented on a typical adaptive optics (AO) system to improve the wavefront reconstruction beyond the capabilities of a wavefront sensor by using the information from the imaging camera. The algorithm is based on a small-phase approximation enabling fast numerical implementation, and it finds the optimal wavefront correction by iteratively updating the deformable mirror. Our experiments were made at an AO-setup with a 37 actuator membrane mirror, and the results show that the algorithm finds an optimal image quality in 5–10 iterations, when the initial wavefront errors are typical non-common path aberrations having a magnitude of 1–1.5 rad rms. The results are in excellent agreement with corresponding numerical simulations.

Paper Details

Date Published: 13 September 2012
PDF: 11 pages
Proc. SPIE 8447, Adaptive Optics Systems III, 84475Z (13 September 2012); doi: 10.1117/12.926266
Show Author Affiliations
Visa Korkiakoski, Leiden Observatory (Netherlands)
Christoph U. Keller, Leiden Observatory (Netherlands)
Niek Doelman, TNO Science and Industry (Netherlands)
Rufus Fraanje, Delft Ctr. for Systems and Control (Netherlands)
Raluca Andrei, Delft Ctr. for Systems and Control (Netherlands)
Michel Verhaegen, Delft Ctr. for Systems and Control (Netherlands)

Published in SPIE Proceedings Vol. 8447:
Adaptive Optics Systems III
Brent L. Ellerbroek; Enrico Marchetti; Jean-Pierre Véran, Editor(s)

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