28 July 2008 Minimizing instrumental polarization in the Multiangle SpectroPolarmetric Imager (MSPI) using diattenuation balancing between the three mirror coatings
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Abstract
Special enhanced silver mirror coatings were designed and fabricated to minimize the polarization introduced by a three-mirror off-axis high-accuracy telescope. A system diattenuation of approximately 1% in the VIS-NIR was achieved by both reducing the diattenuation from each mirror individually and by balancing the diattenuations introduced by the three mirrors over the spectral range. This process of low-polarization engineering involves minimizing system polarization introduced by surface geometry, thin film coatings and birefringent elements, and measuring the system. In this report we will outline a methodology to minimize instrumental polarization aberrations, with an emphasis on achieving low diattenuation in the MSPI camera, given its off-axis geometry and coating design constraints imposed by the space-based application. This polarization balancing technique for mirror coatings can be applied to astrophysics applications.
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Anna-Britt Mahler, Anna-Britt Mahler, Nasrat A. Raouf, Nasrat A. Raouf, Paula K. Smith, Paula K. Smith, Stephen C. McClain, Stephen C. McClain, Russell A. Chipman, Russell A. Chipman, } "Minimizing instrumental polarization in the Multiangle SpectroPolarmetric Imager (MSPI) using diattenuation balancing between the three mirror coatings", Proc. SPIE 7013, Optical and Infrared Interferometry, 701355 (28 July 2008); doi: 10.1117/12.791941; https://doi.org/10.1117/12.791941
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