Spatial linear dark field control: stabilizing deep contrast for exoplanet imaging using bright speckles
Affiliation
Univ Arizona, Steward ObservUniv Arizona, Coll Opt Sci
Issue Date
2017-10-30
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Spatial linear dark field control: stabilizing deep contrast for exoplanet imaging using bright speckles 2017, 3 (04):1 Journal of Astronomical Telescopes, Instruments, and SystemsRights
© The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
Direct imaging of exoplanets requires establishing and maintaining a high-contrast dark field (DF) within the science image to a high degree of precision (10(-10)). Current approaches aimed at establishing the DF, such as electric field conjugation (EFC), have been demonstrated in the lab and have proven capable of high-contrast DF generation. The same approaches have been considered for the maintenance of the DF as well. However, these methods rely on phase diversity measurements, which require field modulation; this interrupts the DF and consequently competes with the science acquisition. We introduce and demonstrate spatial linear dark field control (LDFC) as an alternative technique by which the high-contrast DF can be maintained without modulation. Once the DF has been established by conventional EFC, spatial LDFC locks the high-contrast state of the DF by operating a closed loop around the linear response of the bright field (BF) to wavefront variations that modify both the BF and the DF. We describe the fundamental operating principles of spatial LDFC and provide numerical simulations of its operation as a DF stabilization technique that is capable of wavefront correction within the DF without interrupting science acquisition. (c) The Authors.ISSN
2329-4124Version
Final published versionSponsors
NASA Exoplanet Exploration Program Segmented Coronagraph Design and Analysisae974a485f413a2113503eed53cd6c53
10.1117/1.JATIS.3.4.049002
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Except where otherwise noted, this item's license is described as © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License.