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Proceedings Paper

SPEED design optimization via Fresnel propagation analysis
Author(s): Mathilde Beaulieu; Lyu Abe; Patrice Martinez; Carole Gouvret; Julien Dejonghe; Oliver Preis; Farrokh Vakili
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Paper Abstract

Future extremely large telescopes will open a niche for exoplanet direct imaging at the expense of using a primary segmented mirror which is known to hamper high-contrast imaging capabilities. The focal plane diffraction pattern is dominated by bright structures and the way to reduce them is not straightforward since one has to deal with strong amplitude discontinuities in this kind of unfriendly pupil (segment gaps and secondary support). The SPEED experiment developed at Lagrange laboratory is designed to address this specific topic along with high-contrast at very small separation. The baseline design of SPEED will combine a coronagraph and two deformable mirrors to create dark zones at the focal plane. A first step in this project was to identify under which circumstances the deep contrast at small separation is achievable. In particular, the DMs location is among the critical aspect to consider and is the topic covered by this paper.

Paper Details

Date Published: 8 August 2016
PDF: 8 pages
Proc. SPIE 9906, Ground-based and Airborne Telescopes VI, 99062X (8 August 2016); doi: 10.1117/12.2232661
Show Author Affiliations
Mathilde Beaulieu, Lab. J.L. Lagrange (France)
Lyu Abe, Lab. J.L. Lagrange (France)
Patrice Martinez, Lab. J.L. Lagrange (France)
Carole Gouvret, Lab. J.L. Lagrange (France)
Julien Dejonghe, Lab. J.L. Lagrange (France)
Oliver Preis, Lab. J.L. Lagrange (France)
Farrokh Vakili, Lab. J.L. Lagrange (France)

Published in SPIE Proceedings Vol. 9906:
Ground-based and Airborne Telescopes VI
Helen J. Hall; Roberto Gilmozzi; Heather K. Marshall, Editor(s)

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