Polarization effects in Fabry-Pérot interferometer-based solar spectrometers

H.-P. Doerr; O. von der Lühe II; T. J. Kentischer

doi:10.1117/12.789180

9 July 2008 Polarization effects in Fabry-Perot interferometer-based solar spectrometers

H.-P. Doerr, O. von der Lühe II, T. J. Kentischer

Proceedings Volume 7014, Ground-based and Airborne Instrumentation for Astronomy II; 701417 (2008) https://doi.org/10.1117/12.789180
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

Abstract

The influence of thin film multilayer coatings of Fabry-Perot interferometers (FPI) on polarimetric measurements is investigated. Because the oblique ray reflectivity of the coatings in general is polarization dependent, the transmission profile is slightly different for the s- and p-components of light passing through the FPI, resulting in weak artificial polarization signals. The difference increases with larger angles of incidence and higher design reflectivity of the coatings. In order to estimate the magnitude of the effect, we perform numerical calculations with different coating designs and different optical configurations. We conclude that while current slow focal ratio solar FPI spectrometers are safe, high-precision polarimetric measurements with large aperture solar telescopes which may require considerably steeper focal ratios may suffer from spurious polarization effects.

Citation Download Citation

H.-P. Doerr, O. von der Lühe II, and T. J. Kentischer "Polarization effects in Fabry-Perot interferometer-based solar spectrometers", Proc. SPIE 7014, Ground-based and Airborne Instrumentation for Astronomy II, 701417 (9 July 2008); https://doi.org/10.1117/12.789180

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