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An EUV Stokes polarimeter designed for operation up to 150 eV photon energy has been fabricated and commissioned (with red, green and violet light). The polarimeter consists of two identical 4-mirror optical groups acting as a phase retarder and analyser respectively. Each group is capable of independent azimuthal rotation about the beam without deviating the beam. The mirrors are gold coated and operating at 80° angle of incidence. Such an instrument can determine both the full Stokes vector of the incoming light and the optical constants (polarizance and phase delay) of the optical elements of the polarimeter, which are then translated into the optical constants (n and k) for gold and compared to the literature values.
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Gillian Black, Xiaoyu Cui, Sergey Gorovikov, Feizhu He, Grant Henneberg, Michael A. MacDonald, Brian Yates, Lucia Zuin, "EUV Stokes reflection polarimeter using gold coated mirrors for use up to 150 eV photon energy," Proc. SPIE 11109, Advances in Metrology for X-Ray and EUV Optics VIII, 111090G (9 September 2019); https://doi.org/10.1117/12.2528826