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Proceedings Paper

Linear dark field control: simulation for implementation and testing on the UA wavefront control testbed
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Paper Abstract

This paper presents the early-stage simulation results of linear dark field control (LDFC) as a new approach to maintaining a stable dark hole within a stellar post-coronagraphic PSF. In practice, conventional speckle nulling is used to create a dark hole in the PSF, and LDFC is then employed to maintain the dark field by using information from the bright speckle field. The concept exploits the linear response of the bright speckle intensity to wavefront variations in the pupil, and therefore has many advantages over conventional speckle nulling as a method for stabilizing the dark hole. In theory, LDFC is faster, more sensitive, and more robust than using conventional speckle nulling techniques, like electric field conjugation, to maintain the dark hole. In this paper, LDFC theory, linear bright speckle characterization, and first results in simulation are presented as an initial step toward the deployment of LDFC on the UA Wavefront Control testbed in the coming year.

Paper Details

Date Published: 2 September 2016
PDF: 9 pages
Proc. SPIE 9909, Adaptive Optics Systems V, 99094G (2 September 2016); doi: 10.1117/12.2232120
Show Author Affiliations
Kelsey Miller, College of Optical Sciences, Univ. of Arizona (United States)
Olivier Guyon, Univ. of Arizona (United States)
Subaru Telescope, National Observatory of Japan (United States)
Astrobiology Ctr. (Japan)

Published in SPIE Proceedings Vol. 9909:
Adaptive Optics Systems V
Enrico Marchetti; Laird M. Close; Jean-Pierre Véran, Editor(s)

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