A Caltech Library Service

Spatial linear dark field control and holographic modal wavefront sensing with a vAPP coronagraph on MagAO-X

Miller, Kelsey and Males, Jared R. and Guyon, Olivier and Close, Laird M. and Doelman, David and Snik, Frans and Por, Emiel and Wilby, Michael J. and Keller, Christoph and Bohlman, Chris and Van Gorkom, Kyle and Rodack, Alexander and Knight, Justin and Lumbres, Jennifer and Bos, Steven and Jovanovic, Nemanja (2019) Spatial linear dark field control and holographic modal wavefront sensing with a vAPP coronagraph on MagAO-X. Journal of Astronomical Telescopes, Instruments, and Systems, 5 (4). Art. No. 049004. ISSN 2329-4124.

[img] PDF - Published Version
Creative Commons Attribution.


Use this Persistent URL to link to this item:


The Magellan Extreme Adaptive Optics (MagAO-X) Instrument is an extreme AO system coming online at the end of 2019 that will be operating within the visible and near-IR. With state-of-the-art wavefront sensing and coronagraphy, MagAO-X will be optimized for high-contrast direct exoplanet imaging at challenging visible wavelengths, particularly Hα. To enable high-contrast imaging, the instrument hosts a vector apodizing phase plate (vAPP) coronagraph. The vAPP creates a static region of high contrast next to the star that is referred to as a dark hole; on MagAO-X, the expected dark hole raw contrast is ∼4  ×  10⁻⁶. The ability to maintain this contrast during observations, however, is limited by the presence of non-common path aberrations (NCPA) and the resulting quasi-static speckles that remain unsensed and uncorrected by the primary AO system. These quasi-static speckles within the dark hole degrade the high contrast achieved by the vAPP and dominate the light from an exoplanet. The aim of our efforts here is to demonstrate two focal plane wavefront sensing (FPWFS) techniques for sensing NCPA and suppressing quasi-static speckles in the final focal plane. To sense NCPA to which the primary AO system is blind, the science image is used as a secondary wavefront sensor. With the vAPP, a static high-contrast dark hole is created on one side of the PSF, leaving the opposite side of the PSF unocculted. In this unobscured region, referred to as the bright field, the relationship between modulations in intensity and low-amplitude pupil plane phase aberrations can be approximated as linear. The bright field can therefore be used as a linear wavefront sensor to detect small NCPA and suppress quasi-static speckles. This technique, known as spatial linear dark field control (LDFC), can monitor the bright field for aberrations that will degrade the high-contrast dark hole. A second form of FPWFS, known as holographic modal wavefront sensing (hMWFS), is also employed with the vAPP. This technique uses hologram-generated PSFs in the science image to monitor the presence of low-order aberrations. With LDFC and the hMWFS, high contrast across the dark hole can be maintained over long observations, thereby allowing planet light to remain visible above the stellar noise over the course of observations on MagAO-X. Here, we present simulations and laboratory demonstrations of both spatial LDFC and the hMWFS with a vAPP coronagraph at the University of Arizona Extreme Wavefront Control Laboratory. We show both in simulation and in the lab that the hMWFS can be used to sense low-order aberrations and reduce the wavefront error (WFE) by a factor of 3  −  4  ×  . We also show in simulation that, in the presence of a temporally evolving pupil plane phase aberration with 27-nm root-mean-square (RMS) WFE, LDFC can reduce the WFE to 18-nm RMS, resulting in factor of 6 to 10 gain in contrast that is kept stable over time. This performance is also verified in the lab, showing that LDFC is capable of returning the dark hole to the average contrast expected under ideal lab conditions. These results demonstrate the power of the hMWFS and spatial LDFC to improve MagAO-X’s high-contrast imaging capabilities for direct exoplanet imaging.

Item Type:Article
Related URLs:
URLURL TypeDescription
Guyon, Olivier0000-0002-1097-9908
Close, Laird M.0000-0002-2167-8246
Additional Information:© 2019 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. Paper 19072 received Jun. 27, 2019; accepted for publication Nov. 18, 2019; published online Dec. 5, 2019. This work was supported (in part) by NSF MRI Award #1625441 (MagAO-X).
Funding AgencyGrant Number
Subject Keywords:direct exoplanet imaging; high-contrast imaging; holographic modal wavefront sensing; wavefront control; coronagraphic low-order wavefront sensing; spatial linear dark-field control; vector apodizing phase plate; Magellan Extreme Adaptive Optics
Issue or Number:4
Record Number:CaltechAUTHORS:20191209-130200790
Persistent URL:
Official Citation:Kelsey Miller, Jared R. Males, Olivier Guyon, Laird M. Close, David Doelman, Frans Snik, Emiel Por, Michael J. Wilby, Christoph Keller, Chris Bohlman, Kyle Van Gorkom, Alexander Rodack, Justin Knight, Jennifer Lumbres, Steven Bos, and Nemanja Jovanovic "Spatial linear dark field control and holographic modal wavefront sensing with a vAPP coronagraph on MagAO-X," Journal of Astronomical Telescopes, Instruments, and Systems 5(4), 049004 (5 December 2019).
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:100241
Deposited By: Tony Diaz
Deposited On:09 Dec 2019 21:40
Last Modified:09 Dec 2019 21:40

Repository Staff Only: item control page