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Laboratory testing of coronagraphs for future space telescopes on the Caltech high contrast spectroscopy testbed for segmented telescopes (HCST) (Conference Presentation)

Ruane, Garreth and Mawet, Dimitri and Delorme, Jacques-Robert and Jovanovic, Nemanja and Echeverri, Daniel and Llop Sayson, Jorge D. and Zhang, Manxuan (Rebecca) and Riggs, A. J. Eldorado and Shaklan, Stuart and Serabyn, Eugene and Wallace, James K. (2018) Laboratory testing of coronagraphs for future space telescopes on the Caltech high contrast spectroscopy testbed for segmented telescopes (HCST) (Conference Presentation). In: Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave. Proceedings of SPIE. No.10698. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 106981F. ISBN 9781510619494. https://resolver.caltech.edu/CaltechAUTHORS:20190823-134013721

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Abstract

Imaging Earth-like exoplanets with future space telescopes will require a coronagraph instrument that is capable of creating a dark zone in the starlight at the image plane that is ten orders of magnitude fainter than the off-axis image of the host star. What is more, the coronagraph must simultaneously provide a stable dark zone and high throughput over the angular separations that correspond to habitable zones around nearby Sun-like stars (~10-100 milliarcseconds). Since the pupils of most large-aperture space telescope architectures are likely to be obstructed by secondary mirrors, spider support structures, and gaps between mirror segments, the coronagraph optics must also be specially tailored to passively suppress starlight diffracted from the obstructions and discontinuities in the telescope pupil. Here, we demonstrate an apodized vortex coronagraph optimized for an off-axis segmented telescope on the new High Contrast Spectroscopy Testbed for Segmented Telescopes (HCST) at Caltech. The coronagraph consists of a microdot apodizer, a liquid crystal vortex phase mask in the focal plane, and a Lyot stop. The microdot apodizer is an AR-coated glass window with 10um gold microdots to be used in reflection around lambda=800nm. We describe the HCST optical system; the apodizer optimization, fabrication, and metrology procedures; and present end-to-end testbed results of the coronagraph coupled with a 32x32 Boston Micromachines deformable mirror for wavefront control. We aim to achieve a dark zone 10^(-7) times fainter than the simulated host star over a wavelength range of 800±40nm in Spring 2018. Finally, we will outline future plans to demonstrate coronagraph concepts for centrally obscured telescopes.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1117/12.2312851DOIVideo
ORCID:
AuthorORCID
Ruane, Garreth0000-0003-4769-1665
Mawet, Dimitri0000-0002-8895-4735
Echeverri, Daniel0000-0002-1583-2040
Riggs, A. J. Eldorado0000-0002-0863-6228
Additional Information:© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE).
Group:Astronomy Department
Series Name:Proceedings of SPIE
Issue or Number:10698
Record Number:CaltechAUTHORS:20190823-134013721
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190823-134013721
Official Citation:Garreth Ruane, Dimitri Mawet, Jacques-Robert Delorme, Nemanja Jovanovic, Daniel Echeverri, Jorge D. Llop Sayson, Manxuan (Rebecca) Zhang, A. J. Eldorado Riggs, Stuart Shaklan, Eugene Serabyn, and James K. Wallace "Laboratory testing of coronagraphs for future space telescopes on the Caltech high contrast spectroscopy testbed for segmented telescopes (HCST) (Conference Presentation)", Proc. SPIE 10698, Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave, 106981F (10 July 2018); https://doi.org/10.1117/12.2312851
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:98186
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:23 Aug 2019 22:21
Last Modified:11 Mar 2020 19:29

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