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Paper: Polarization-Holographic Imaging Stokes Polarimeter for Observational Study of the Sun
Volume: 526, Solar Polarization Workshop 8
Page: 357
Authors: Kvernadze, T.; Kurkhuli, G.; Kilosanidze, B.; Kakauridze, G.; Kulijanishvili, V.; Khutsishvili, E.; Khutsishvili, D.
Abstract: We present an innovative polarization-holographic imaging Stokes polarimeter based on a polarization-holographic diffraction element, which enables the complete real time analysis of the polarization state of the incoming light. An element decomposes the incoming light into diffraction orders, the intensities of which vary depending on the polarization state of the light source. After the CCD intensity measurements of the corresponding points or areas in the diffraction orders, and further data reduction through the calibration parameters, we get the real-time Stokes images of the light source, which allows determining the full polarization state of a point or extended space object in either a narrow or wide spectral range. The operating spectral range of the polarimeter is 500–1600 nm with diffraction efficiency equal to 20% at 532 nm, 16% at 635 nm and 2% at 1550 nm. The theoretical model of the relation between measured intensities in different diffraction orders and Stokes parameters, developed by Kilosanidze & Kakauridze (2007), was used to calibrate the polarimeter. The tests show that the resulting errors are better than 1%. First polarimetric test images were obtained for stars and solar spicules. The polarimeter is compact, lightweight, and could be installed on ground-based, airborne, or space telescopes.
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