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Optimizing optics and opto-mechanical mounting to minimize static aberrations in high-contrast instruments

Echeverri, D. and Jovanovic, N. and Delorme, J. R. and Ruane, G. and Fucik, J. and Wallace, J. K. and Mawet, D. (2018) Optimizing optics and opto-mechanical mounting to minimize static aberrations in high-contrast instruments. In: Adaptive Optics Systems VI. Proceedings of SPIE. No.10703. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 1070358. ISBN 9781510619593. https://resolver.caltech.edu/CaltechAUTHORS:20190823-134014824

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Abstract

One of the goals of high-contrast imaging is to reach contrasts of 10^(-10) at small inner working angles to directly image Earth-like exoplanets around solar-type stars. In most imaging systems, a deformable mirror (DM) in the pupil plane can correct for phase errors but surface errors in out-of-pupil optics get coupled into amplitude errors which can only be controlled with a second, out of pupil, DM. Furthermore, correcting static errors introduced by the optics can take up valuable DM stroke. Thus, minimizing the wavefront error within the system is critical to reaching high contrast levels. For example, the High Contrast Spectroscopy for Segmented Telescopes Testbed (HCST) in the Exoplanet Technologoy lab at Caltech aims to develop exoplanet imaging technologies down to small inner working angles (< 3λ/D) which requires an RMS wavefront error of less than 10 nm per optic to achieve a contrast of 10^(−5) with the DM flattened. While aligning HCST, it was determined that despite the excellent surface quality of all the optics, the mounts were introducing significant wavefront errors. Here we assess the effect of mount-induced wavefront errors that can rapidly consume the wavefront budget of a high-contrast system. We also present the method used to mitigate this effect within HCST such that a mean contrast of 6 × 10^(-6) from 3-10λ/D was achieved with a vortex coronagraph and flattened DM.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1117/12.2313887DOIArticle
ORCID:
AuthorORCID
Echeverri, D.0000-0002-1583-2040
Ruane, G.0000-0003-4769-1665
Mawet, D.0000-0002-8895-4735
Additional Information:© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE). The authors would like to acknowledge the financial support of the Heising-Simons foundation. G. Ruane is supported by an NSF Astronomy and Astrophysics Postdoctoral Fellowship under award AST-1602444. This work was also supported by the Exoplanet Exploration Program (ExEP), Jet Propulsion Laboratory, California Institute of Technology, under contract to NASA.
Group:Astronomy Department
Funders:
Funding AgencyGrant Number
Heising-Simons FoundationUNSPECIFIED
NSF Astronomy and Astrophysics FellowshipAST-1602444
NASA/JPL/CaltechUNSPECIFIED
Subject Keywords:High Contrast Imaging, Instrumentation, Opto-Mechanical Systems
Series Name:Proceedings of SPIE
Issue or Number:10703
Record Number:CaltechAUTHORS:20190823-134014824
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190823-134014824
Official Citation:D. Echeverri, N. Jovanovic, J.-R. Delorme, G. Ruane, J. Fucik, J. K. Wallace, and D. Mawet "Optimizing optics and opto-mechanical mounting to minimize static aberrations in high-contrast instruments", Proc. SPIE 10703, Adaptive Optics Systems VI, 1070358 (13 July 2018); https://doi.org/10.1117/12.2313887
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:98197
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:23 Aug 2019 21:18
Last Modified:11 Oct 2019 03:04

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