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22 December 2020 Mueller matrix maps of dichroic filters reveal polarization aberrations
James Heath, Meredith Kupinski, Ewan Douglas, Kira Hart, James Breckinridge
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Proceedings Volume 11443, Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave; 1144341 (2020) https://doi.org/10.1117/12.2576282
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only
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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.
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James Heath, Meredith Kupinski, Ewan Douglas, Kira Hart, and James Breckinridge "Mueller matrix maps of dichroic filters reveal polarization aberrations", Proc. SPIE 11443, Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave, 1144341 (22 December 2020); https://doi.org/10.1117/12.2576282
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KEYWORDS
Polarization
Coronagraphy
Imaging systems
Polarimetry
Wave plates
Point spread functions
Ray tracing
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