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6 October 2011 Space-qualified liquid-crystal variable retarders for wide-field-of-view coronagraphs
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Liquid-crystal variable retarders (LCVRs) are an emergent technology for space-based polarimeters, following its success as polarization modulators in ground-based polarimeters and ellipsometers. Wide-field double nematic LCVRs address the high angular sensitivity of nematic LCVRs at some voltage regimes. We present a work in which wide-field LCVRs were designed and built, which are suitable for wide-field-of-view instruments such as polarimetric coronagraphs. A detailed model of their angular acceptance was made, and we validated this technology for space environmental conditions, including a campaign studying the effects of gamma, proton irradiation, vibration and shock, thermo-vacuum and ultraviolet radiation.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
N. Uribe-Patarroyo, A. Alvarez-Herrero, P. García Parejo, J. Vargas, R. L. Heredero, R. Restrepo, V. Martínez Pillet, J. C. del Toro Iniesta, A. López, S. Fineschi, G. Capobianco, M. Georges, M. López, G. Boer, and I. Manolis "Space-qualified liquid-crystal variable retarders for wide-field-of-view coronagraphs", Proc. SPIE 8148, Solar Physics and Space Weather Instrumentation IV, 814810 (6 October 2011);

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