Space-qualified liquid-crystal variable retarders for wide-field-of-view coronagraphs

  • Uribe-Patarroyo N
  • Alvarez-Herrero A
  • García Parejo P
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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).

Author-supplied keywords

  • coronagraphs
  • liquid-crystal variable retarders
  • polarimetry
  • space applications

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  • N. Uribe-Patarroyo

  • A. Alvarez-Herrero

  • P. García Parejo

  • J. Vargas

  • R.L. Heredero

  • R. Restrepo

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