Minimizing instrumental polarization in the multiangle spectropolarimetric imager (MSPI) using diattenuation balancing between the three mirror coatings

Anna Britt Mahler, Nasrat A. Raouf, Paula K. Smith, Stephen C. McClain, Russell A. Chipman

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Scopus citations

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.

Original languageEnglish (US)
Title of host publicationOptical and Infrared Interferometry
DOIs
StatePublished - Oct 2 2008
EventOptical and Infrared Interferometry - Marseille, France
Duration: Jun 23 2008Jun 27 2008

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7013
ISSN (Print)0277-786X

Other

OtherOptical and Infrared Interferometry
CountryFrance
CityMarseille
Period6/23/086/27/08

Keywords

  • Diattenuation
  • High reflectance
  • Low polarization
  • Polarization aberration
  • Retardance
  • Thin film coatings

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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