@inproceedings{ffa2ada5aaab4a2488c2d7c6e882c208,
title = "Laboratory Demonstration of High Contrast with the PIAACMC Coronagraph on an Obstructed and Segmented Aperture",
abstract = "Coronagraphs are an important technology to directly image and characterize exoplanets. Their efficiency has steadily been improving over the past several decades, but has not yet reached fundamental limits. In particular, the expected exoplanet yield for missions such as the Astro2020-recommended “IR/O/UV Flagship” can still be improved by factors of at least 2-4. One possible architecture that can enable at least a part of this improvement is the Phase-Induced Amplitude Apodization Complex Mask Coronagraph (PIAACMC). It features high throughput, small inner working angle (IWA), and almost no loss in PSF sharpness, and natively supports obstructed and segmented apertures. Historically, key disadvantages of PIAA have been poor tolerance to stellar angular sizes and maturity, but latest designs and demonstrations have made significant strides in this respect. We present the current status of our program to mature the PIAACMC technology. We first present our PIAACMC designs for LUVOIR-A and B, which resulted in improved expected yield of Exo-Earths relative to the baselines for both mission concepts. In particular, for LUVOIR-B, the yield improves from 28 to 42 due to improved tolerance to stellar angular size in our design. Our and vacuum demonstrations for the LUVOIR-A aperture at JPL's High Contrast Imaging Testbed (HCIT) include: 1.9e-8 raw contrast in 10% broadband light between 3.5 and 8 l/D; 4.1e-8 and 1.6e-9 coherent contrasts in monochromatic light between 2-4 and 4-8 l/D, respectively. We also present measurements and analysis of sensitivity to tip/tilt jitter and stellar angular size and compare our test results to models.",
keywords = "coronagraph, direct imaging, exoplanet, habitable, high contrast, LUVOIR, PIAA, PIAACMC",
author = "Ruslan Belikov and Dan Sirbu and David Marx and Prada, {Camilo Mejia} and Eduardo Bendek and Eugene Pluzhnik and Stephen Bryson and Brian Kern and Olivier Guyon and Kevin Fogarty and Justin Knight and Dan Wilson and John Hagopian",
note = "Funding Information: This work was supported in part by the National Aeronautics and Space Administration's Ames Research Center, as well as the NASA Strategic Astrophysics Technology – Technology Development for Exoplanet Missions (SAT-TDEM) program through solicitation NNH16ZDA001N-SAT at NASA's Science Mission Directorate. It was carried out at the NASA Ames Research Center, the NASA Jet Propulsion Laboratory, and the University of Arizona. Any opinions, findings, and conclusions or recommendations expressed in this article are those of the authors and do not necessarily reflect the views of the National Aeronautics and Space Administration. Funding Information: This work was supported in part by the National Aeronautics and Space Administration's Ames Research Center, as well as the NASA Strategic Astrophysics Technology - Technology Development for Exoplanet Missions (SAT-TDEM) program through solicitation NNH16ZDA001N-SAT at NASA's Science Mission Directorate. It was carried out at the NASA Ames Research Center, the NASA Jet Propulsion Laboratory, and the University of Arizona. Any opinions, findings, and conclusions or recommendations expressed in this article are those of the authors and do not necessarily reflect the views of the National Aeronautics and Space Administration. Publisher Copyright: {\textcopyright} 2022 SPIE.; Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave ; Conference date: 17-07-2022 Through 22-07-2022",
year = "2022",
doi = "10.1117/12.2630474",
language = "English (US)",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Coyle, {Laura E.} and Shuji Matsuura and Perrin, {Marshall D.}",
booktitle = "Space Telescopes and Instrumentation 2022",
}