Abstract
We calculate a theoretical model of the polarization properties of a Gregory-Coudé telescope to predict the behaviour of the German Gregory-Coudé Telescope installed at the Observatorio del Teide (Spain). Measurements of the real effects produced by this telescope acting upon light of known polarization are compared with the model. We estimate an uncertainty in its predictions of about 10%, which is produced by the uncertainties of the (complex) refractive index of the metallic layers covering the mirrors. The paper concludes by briefly considering the way in which the plain telescope changes the Stokes' profiles.
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Almeida, J.S., Pillet, V.M. & Wittmann, A.D. The instrumental polarization of a Gregory-Coudé telescope. Sol Phys 134, 1–13 (1991). https://doi.org/10.1007/BF00148738
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DOI: https://doi.org/10.1007/BF00148738