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3 September 2021 New method to achieve the proper polarization state for a vector vortex coronagraph
Jorge Llop-Sayson, Cole Kappel, Nemanja Jovanovic, Dimitri Mawet, Carl Coker
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Proceedings Volume 11823, Techniques and Instrumentation for Detection of Exoplanets X; 118230P (2021) https://doi.org/10.1117/12.2594871
Event: SPIE Optical Engineering + Applications, 2021, San Diego, California, United States
Abstract
Characterizing the atmospheres of Earth-sized planets necessitates of the advancement in broadband wavefront control for coronagraph systems in large segmented telescopes. At the the High-Contrast Spectroscopy Testbed (HCST) in the Exoplanet Technology Laboratory (ET Lab) at Caltech we are working on a new concept that utilizes single mode fibers (SMFs) at the image plane of the coronagraph to recover the light from the planet and feed it into a spectrograph. This technology has shown to be advantageous in both chromatic and wavefront control performance. Here we report on the status of our 20% bandwidth wavefront control experiments, in which we control the starlight coupling into an SMF in the image plane. We achieve levels of 10^-8 with deformable mirror (DM) solutions that hold the null through the SMF for several hours.
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Jorge Llop-Sayson, Cole Kappel, Nemanja Jovanovic, Dimitri Mawet, and Carl Coker "New method to achieve the proper polarization state for a vector vortex coronagraph", Proc. SPIE 11823, Techniques and Instrumentation for Detection of Exoplanets X, 118230P (3 September 2021); https://doi.org/10.1117/12.2594871
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KEYWORDS
Polarization
Coronagraphy
Exoplanets
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