CONFERENCE PROCEEDINGS
Advanced Search
Home > Journals > J. Astron. Telesc. Instrum. Syst. > Volume 3 > Issue 4 > Article
Open Access
30 October 2017 Spatial linear dark field control: stabilizing deep contrast for exoplanet imaging using bright speckles
Kelsey Miller, Olivier Guyon, Jared Males
Author Affiliations +
Journal of Astronomical Telescopes, Instruments, and Systems, Vol. 3, Issue 4, 049002 (October 2017). https://doi.org/10.1117/1.JATIS.3.4.049002
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.
CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
Citation Download Citation
Kelsey Miller, Olivier Guyon, and Jared Males "Spatial linear dark field control: stabilizing deep contrast for exoplanet imaging using bright speckles," Journal of Astronomical Telescopes, Instruments, and Systems 3(4), 049002 (30 October 2017). https://doi.org/10.1117/1.JATIS.3.4.049002
Received: 4 April 2017; Accepted: 3 October 2017; Published: 30 October 2017
JOURNAL ARTICLE
 11 PAGES
DOWNLOAD PAPER SAVE TO MY LIBRARY
GET CITATION
Lens.org Logo
CITATIONS
Cited by 35 scholarly publications.
Advertisement
Advertisement
KEYWORDS
Speckle
Exoplanets
Wavefronts
Modulation
Actuators
Coronagraphy
Phase shift keying
RELATED CONTENT
Subscribe to Digital Library
Receive Erratum Email Alert
Back to Top