@inproceedings{a073edd8109a473aba857dd298f449b5,
title = "Mueller matrix maps of dichroic filters reveal polarization aberrations",
abstract = "Dichroic filters are used by instrument designers to split a field of view into different optical paths for simultaneous measurement of different spectral bands. Quantifying the polarization aberrations of a dichroic is relevant for predicting the incident polarization states downstream, which could affect the performance of diffraction limited systems. One important application is the fore-optics of exoplanet imaging coronagraphs. In this work, the polarization properties of the Edmund #69-205 650 nm roll-off dichroic are measured using a rotating retarder Mueller matrix imaging polarimeter. The polarization properties of this commercial dichroic are compared at normal and 45° angle of incidence. The normal incidence measurements verify the instrument calibration since no polarization aberrations were observed. Transmission measurements at 680 nm and 45° yield a 2.9 rad magnitude of retardance and 0.95 diattenuation. Effectively, at 630 nm the dichroic is a λ/4 waveplate with a horizontal fast-axis.",
keywords = "Coronagraphs, Dichroic, Mueller matrix polarimetry, Polarization, Thin films",
author = "James Heath and Meredith Kupinski and Ewan Douglas and Kira Hart and James Breckinridge",
note = "Publisher Copyright: {\textcopyright} COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.; Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave ; Conference date: 14-12-2020 Through 22-12-2020",
year = "2020",
doi = "10.1117/12.2576282",
language = "English (US)",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Makenzie Lystrup and Perrin, {Marshall D.}",
booktitle = "Space Telescopes and Instrumentation 2020",
}