The space coronagraph optical bench (SCoOB): 3. Mueller matrix polarimetry of a coronagraphic exit pupil

Jaren N. Ashcraft; Ewan S. Douglas; Ramya M. Anche; Kyle Van Gorkom; Emory Jenkins; William Melby; Maxwell A. Millar-Blanchaer

doi:10.1117/12.3019204

23 August 2024 The space coronagraph optical bench (SCoOB): 3. Mueller matrix polarimetry of a coronagraphic exit pupil

Jaren N. Ashcraft, Ewan S. Douglas, Ramya M. Anche, Kyle Van Gorkom, Emory Jenkins, William Melby, Maxwell A. Millar-Blanchaer

Author Affiliations +

Proceedings Volume 13092, Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave; 130926K (2024) https://doi.org/10.1117/12.3019204
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

High-contrast imaging in the next decade aims to image exoplanets at smaller angular separations and deeper contrasts than ever before. A problem that has recently garnered attention for telescopes equipped with high-contrast coronagraphs is polarization aberration arising from the optics. These aberrations manifest as low-order aberrations of different magnitudes for orthogonal polarization states and spread light into the dark hole of the coronagraph that cannot be fully corrected. The origin of polarization aberrations has been modeled at the telescope level. However, we don't fully understand how polarization aberrations arise at the instrument level. To directly measure this effect, we construct a dual-rotating-retarder polarimeter around the SCoOB high-contrast imaging testbed to measure its Mueller matrix. With this matrix, we directly characterize the diattenuation, retardance, and depolarization of the instrument as a function of position in the exit pupil. We measure the polarization aberrations in the Lyot plane, both with and without the Vector Vortex Coronagraph, to understand how polarization couples into high-contrast imaging residuals.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Jaren N. Ashcraft, Ewan S. Douglas, Ramya M. Anche, Kyle Van Gorkom, Emory Jenkins, William Melby, and Maxwell A. Millar-Blanchaer "The space coronagraph optical bench (SCoOB): 3. Mueller matrix polarimetry of a coronagraphic exit pupil", Proc. SPIE 13092, Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave, 130926K (23 August 2024); https://doi.org/10.1117/12.3019204

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