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Laboratory demonstration of wavefront control through a single-mode fiber over a 20% bandwidth for the characterization of exoplanet atmospheres

Llop-Sayson, Jorge and Coker, Carl T. and Jovanovic, Nemanja and Mawet, Dimitri and Ruane, Garreth and Riggs, A. J. Eldorado and Echeverri, Daniel (2022) Laboratory demonstration of wavefront control through a single-mode fiber over a 20% bandwidth for the characterization of exoplanet atmospheres. Journal of Astronomical Telescopes, Instruments, and Systems, 8 (2). Art. No. 029001. ISSN 2329-4124. doi:10.1117/1.jatis.8.2.029001.

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To address the fundamental questions of exoplanetary science, future space-based observatories will have to obtain quality spectra of a large enough set of Earth-like planets around main-sequence stars. Although coronagraph instruments provide the necessary observational efficiency to probe many systems with respect to a starshade observation, they typically suffer from a limited achievable bandwidth at the necessary contrast and relatively poor throughput to off-axis sources. This is mainly due to the fact that the starlight is suppressed within the optical system, so the quasi-static aberrations from optical imperfections are the dominant term and need to be dealt with deformable mirrors (DMs). The DMs have limited capabilities to achieve large bandwidths, and their high stroke after corrections is highly detrimental to the Strehl ratio of off-axis sources. A technological path to overcome these issues is the use of single-mode fibers (SMFs). Coupling the planet light into an SMF to feed a high-resolution spectrograph has been shown to improve the final signal-to-noise ratio. Furthermore, it has been shown that it is more favorable to do broadband wavefront control with SMFs when exploiting their modal selectivity; the DMs have to work less so the bandwidth is improved and the off-axis throughput is better. Here, we demonstrate the potential of this technology by performing wavefront control through an SMF in a two-step process: first, by digging a small dark hole around the position of the SMF, and second, performing an innovative version of the electric field conjugation algorithm modified for SMFs. We perform these experiments with 20% bandwidth light at the high-contrast spectroscopy testbed achieving 2.5 × 10⁻⁸ raw contrast.

Item Type:Article
Related URLs:
URLURL TypeDescription
Llop-Sayson, Jorge0000-0002-3414-784X
Coker, Carl T.0000-0002-9954-7887
Jovanovic, Nemanja0000-0001-5213-6207
Mawet, Dimitri0000-0002-8895-4735
Ruane, Garreth0000-0003-4769-1665
Riggs, A. J. Eldorado0000-0002-0863-6228
Echeverri, Daniel0000-0002-1583-2040
Additional Information:© 2022 Society of Photo-Optical Instrumentation Engineers (SPIE). Received: 14 September 2021; Accepted: 16 March 2022; Published: 7 April 2022. The material is based upon work supported by NASA SAT under award number 80NSSC20K0624. Part of this work was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration (NASA).
Group:Astronomy Department
Funding AgencyGrant Number
Subject Keywords:exoplanets; high-contrast imaging; wavefront control
Issue or Number:2
Record Number:CaltechAUTHORS:20220414-26483000
Persistent URL:
Official Citation:Jorge Llop-Sayson, Carl T. Coker, Nemanja Jovanovic, Dimitri P. Mawet, Garreth J. Ruane, A J Eldorado Riggs, and Daniel Echeverri "Laboratory demonstration of wavefront control through a single-mode fiber over a 20% bandwidth for the characterization of exoplanet atmospheres," Journal of Astronomical Telescopes, Instruments, and Systems 8(2), 029001 (7 April 2022).
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:114305
Deposited By: George Porter
Deposited On:19 Apr 2022 19:07
Last Modified:19 Apr 2022 19:07

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