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Polynomial apodized vortex coronagraphs for obscured telescope pupils
Author(s): Kevin Fogarty; Laurent Pueyo; Johan Mazoyer; Mamadou N'Diaye
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Paper Abstract

Obstructions due to large secondary mirrors, primary mirror segmentation, and secondary mirror support struts all introduce diffraction artifacts that limit the performance offered by coronagraphs. However, just as vortex coronagraphs provides theoretically ideal cancellation of on-axis starlight for clear apertures, the Polynomial Apodized Vortex Coronagraph (PAVC) completely blocks on-axis light for apertures with central obscurations, and delivers off-axis throughput that improves as the topological charge of the vortex increases. We examine the sensitivity of PAVC designs to tip/tilt aberrations and stellar angular size, and discuss methods for mitigating these effects. By imposing additional constraints on the pupil plane apodization, we decrease the sensitivity of the PAVC to the small positional shifts of the on-axis source induced by either tip/tilt or stellar angular size; providing a route to overcoming an important hurdle facing the performance of vortex coronagraphs on telescopes with complicated pupils.

Paper Details

Date Published: 12 September 2017
PDF: 17 pages
Proc. SPIE 10400, Techniques and Instrumentation for Detection of Exoplanets VIII, 104000T (12 September 2017); doi: 10.1117/12.2274603
Show Author Affiliations
Kevin Fogarty, Johns Hopkins Univ. (United States)
Space Telescope Science Institute (United States)
Laurent Pueyo, Space Telescope Science Institute (United States)
Johan Mazoyer, Johns Hopkins Univ. (United States)
Space Telescope Science Institute (United States)
Mamadou N'Diaye, Lab. J.L. Lagrange (France)
Space Telescope Science Institute (United States)


Published in SPIE Proceedings Vol. 10400:
Techniques and Instrumentation for Detection of Exoplanets VIII
Stuart Shaklan, Editor(s)

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