
Proceedings Paper
Laboratory demonstration of an anti-halo reconstructor for closed-loop adaptive halo suppressionFormat | Member Price | Non-Member Price |
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Paper Abstract
In order to suppress the halo and any residual speckles over a region of interest, we find an anti-halo reconstructor which
gives the required changes to a deformable mirror (DM) at the pupil plane. The reconstructor is built from a training set
consisting of measurements of the complex halo influence functions for a spanning set of Fourier modes applied to the
DM. The reconstructor is then found by multiplying the applied DM actuator values by the singular value decomposition
(SVD) pseudo-inverse of the measured complex halo influence functions. Using a single fully illuminated 12×12
actuator DM at the pupil plane, halo suppression for complex pupils out to the control radius of 6 λ/D can be provided.
In practice, a coronagraph is unlikely to achieve high performance without adaptive tuning. We use a coronagraphic
focal plane interferometer [1], where the focal plane mask diverts the bright starlight for use as an interferometric
reference beam to measure the residual complex halo. The result of the reconstructor acting on the complex halo
measurements allowed us to implement a closed loop halo-suppression servo. We discuss the laboratory implementation
and experience with this technique.
Paper Details
Date Published: 22 July 2010
PDF: 10 pages
Proc. SPIE 7736, Adaptive Optics Systems II, 77362S (22 July 2010); doi: 10.1117/12.857825
Published in SPIE Proceedings Vol. 7736:
Adaptive Optics Systems II
Brent L. Ellerbroek; Michael Hart; Norbert Hubin; Peter L. Wizinowich, Editor(s)
PDF: 10 pages
Proc. SPIE 7736, Adaptive Optics Systems II, 77362S (22 July 2010); doi: 10.1117/12.857825
Show Author Affiliations
Esen Salçın, College of Optical Sciences, The Univ. of Arizona (United States)
Johanan L. Codona, The Univ. of Arizona (United States)
Published in SPIE Proceedings Vol. 7736:
Adaptive Optics Systems II
Brent L. Ellerbroek; Michael Hart; Norbert Hubin; Peter L. Wizinowich, Editor(s)
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