@inproceedings{3f0e1fd9a2ae4f34bb804aee990515d1,
title = "Laboratory demonstration of the triple-grating vector vortex coronagraph",
abstract = "The future Habitable Worlds Observatory aims to characterize the atmospheres of rocky exoplanets around solar-type stars. The vector vortex coronagraph (VVC) is a main candidate to reach the required contrast of 10−10. However, the VVC requires polarization filtering and every observing band requires a different VVC. The triple-grating vector vortex coronagraph (tgVVC) aims to mitigate these limitations by combining multiple gratings that minimize the polarization leakage over a large spectral bandwidth. In this paper, we present laboratory results of a tgVVC prototype using the In-Air Coronagraphic Testbed (IACT) facility at NASA{\textquoteright}s Jet Propulsion Laboratory and the Space Coronagraph Optical Bench (SCoOB) at the University of Arizona Space Astrophysics Lab (UASAL). We study the coronagraphic performance with polarization filtering at 633 nm and reach a similar average contrast of 2 × 10−8 between 3-18 λ/D at the IACT, and 6 × 10−8 between 3-14 λ/D at SCoOB. We explore the limitations of the tgVVC by comparing the testbed results. We report on other manufacturing errors and ways to mitigate their impact.",
keywords = "coronagraphy, direct imaging, exoplanets, High-contrast imaging, vortex coronagraph",
author = "Doelman, {David S.} and Mireille Ouellet and Axel Potier and Garreth Ruane and {van Gorkom}, Kyle and Haffert, {Sebastiaan Y.} and Douglas, {Ewan S.} and Frans Snik",
note = "Publisher Copyright: {\textcopyright} 2023 SPIE.; Techniques and Instrumentation for Detection of Exoplanets XI 2023 ; Conference date: 21-08-2023 Through 24-08-2023",
year = "2023",
doi = "10.1117/12.2677432",
language = "English (US)",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Ruane, {Garreth J.}",
booktitle = "Techniques and Instrumentation for Detection of Exoplanets XI",
}