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30 July 2018 Calibration of the liquid crystal visible-light polarimeter for the Metis/Solar Orbiter coronagraph
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Abstract
Metis is the solar coronagraph selected for the payload of the ESA Solar Orbiter mission. Metis will acquire simultaneous imaging in linearly polarized, broadband visible light (580-640 nm) and in the narrow-band HI Ly-α line (121.6 nm). The METIS visible light path includes a polarimeter, designed to observe and analyse the K-corona linearly polarized by Thomson scattering. The polarimeter comprises a liquid crystal Polarization Modulation Package (PMP) together with a quarter-wave retarder and a linear polarizer. The Metis PMP consists of two Anti-Parallel Nematic Liquid Crystal Variable Retarders (LCVRs) with their fast axis parallel with respect to each other and a pre-tilted angle of the molecules in opposite direction. The LCVRs provide an electro-optical modulation of the input polarized light by applying an electric field to the liquid crystal molecules inside the cells. A given optical retardance can be induced in the LCVRs by selecting a suitable voltage value. This presentation will report the polarimetric characterization of the Flight Model of the Metis polarimeter and the voltage-to-retardance calibration.
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
M. Casti, S. Fineschi, G. Capobianco, F. Landini, M. Romoli, E. Antonucci, V. Andretta, G. Naletto, G. Nicolini, D. Spadaro, A. Alvarez-Herrero, P. Garcia-Parejo, and M. Marmonti "Calibration of the liquid crystal visible-light polarimeter for the Metis/Solar Orbiter coronagraph", Proc. SPIE 10698, Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave, 1069831 (30 July 2018); https://doi.org/10.1117/12.2325075
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