Polarization modeling and predictions for DKIST part 1: telescope and example instrument configurations

David M. Harrington; Stacey R. Sueoka

doi:10.1117/12.2233176

22 July 2016 Polarization modeling and predictions for DKIST part 1: telescope and example instrument configurations

Proceedings Volume 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II; 99126U (2016) https://doi.org/10.1117/12.2233176
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

Abstract

We outline polarization performance calculations and predictions for the Daniel K. Inouye Solar Telescope (DKIST) optics and show Mueller matrices for two of the first light instruments. Telescope polarization is due to polarization dependent mirror reflectivity and rotations between groups of mirrors as the telescope moves in altitude and azimuth. The Zemax optical modeling software has polarization ray-trace capabilities and predicts system performance given a coating prescription. We develop a model coating formula that approximates measured witness sample polarization properties. Estimates show the DKIST telescope Mueller matrix as functions of wavelength, azimuth, elevation, and field angle for the Cryogenic Near Infra-Red Spectro-Polarimeter and for the Visible SpectroPolarimeter (ViSP). Footprint variation is substantial and shows vignetted field points will have strong polarization effects. We estimate 2% variation of some Mueller matrix elements over the 5 arc minute CryoNIRSP field. We validate the Zemax model by show limiting cases for flat mirrors in collimated and powered designs that compare well with theoretical approximations and are testable with lab ellipsometers.

Citation Download Citation

David M. Harrington and Stacey R. Sueoka "Polarization modeling and predictions for DKIST part 1: telescope and example instrument configurations", Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 99126U (22 July 2016); https://doi.org/10.1117/12.2233176

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