CaltechAUTHORS
  A Caltech Library Service

High contrast imaging with an arbitrary aperture: active correction of aperture discontinuities: fundamental limits and practical trade-offs

Pueyo, Laurent and Norman, Colin and Soummer, Rémi and Perrin, Marshall and N'Diaye, Mamadou and Choquet, Élodie and Hoffmann, Jordan and Carlotti, Alexis and Mawet, Dimitri (2014) High contrast imaging with an arbitrary aperture: active correction of aperture discontinuities: fundamental limits and practical trade-offs. In: Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave. Proceedings of SPIE. No.9143. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 914321. ISBN 9780819496119. http://resolver.caltech.edu/CaltechAUTHORS:20180615-163734593

[img] PDF - Published Version
See Usage Policy.

3709Kb

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20180615-163734593

Abstract

We present a new method to achieve high-contrast images using segmented and/or on-axis telescopes. Our approach relies on using two sequential Deformable Mirrors to compensate for the large amplitude excursions in the telescope aperture due to secondary support structures and / or segment gaps. We solve the highly non-linear Monge-Ampere equation that is the fundamental equation describing the physics of phase induced amplitude modulation. We determine the optimum configuration for our two sequential Deformable Mirror system and show that high-throughput and high contrast solutions can be achieved using realistic surface deformations that are accessible using existing technologies. We name this process Active Compensation of Aperture Discontinuities (ACAD). We show that for geometries similar to JWST, ACAD can attain at least 10-7 in contrast and an order of magnitude higher for future Extremely Large Telescopes, even when the pupil features a "missing segment" . Because the converging non-linear mappings resulting from our Deformable Mirror shapes damps near-field diffraction artifacts in the vicinity of the discontinuities this solution is particularly appealing in terms of spectral bandwidth. We present preliminary results that illustrate the performances of ACAD in the presence of diffraction for apertures for with secondary support structures of varying width and argue that the ultimate contrast achieved can by combining ACAD with modern wavefront control algorithms.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1117/12.2056925DOIArticle
ORCID:
AuthorORCID
Soummer, Rémi0000-0003-2753-2819
Perrin, Marshall0000-0002-3191-8151
Choquet, Élodie0000-0002-9173-0740
Mawet, Dimitri0000-0002-8895-4735
Additional Information:© 2014 Society of Photo-Optical Instrumentation Engineers (SPIE). This material is partially based upon work supported by the National Aeronautics and Space Administration under Grant NNX12AG05G issued through the Astrophysics Research and Analysis (APRA) program. This work was performed in part under contract with the California Institute of Technology funded by NASA through the Sagan Fellowship Program executed by the NASA Exoplanet Science Institute. This material is also partially based upon work carried out under subcontract 1496556 with the Jet Propulsion Laboratory funded by NASA and administered by the California Institute of Technology.
Funders:
Funding AgencyGrant Number
NASANNX12AG05G
NASA Sagan FellowshipUNSPECIFIED
NASA/JPL/Caltech1496556
Subject Keywords:planetary systems - techniques: coronagraphy, wavefront control
Record Number:CaltechAUTHORS:20180615-163734593
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180615-163734593
Official Citation:Laurent Pueyo, Colin Norman, Rémi Soummer, Marshall Perrin, Mamadou N'Diaye, Élodie Choquet, Jordan Hoffmann, Alexis Carlotti, Dimitri Mawet, "High contrast imaging with an arbitrary aperture: active correction of aperture discontinuities: fundamental limits and practical trade- offs", Proc. SPIE 9143, Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave, 914321 (28 August 2014); doi: 10.1117/12.2056925; https://doi.org/10.1117/12.2056925
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87177
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:18 Jun 2018 15:45
Last Modified:26 Mar 2019 17:16

Repository Staff Only: item control page