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Proceedings Paper

Polarization ray tracing and polarization aberration compensation in reflective astronomical telescopes
Author(s): Derek Sabatke; J. Scott Knight; Matthew R. Bolcar
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Paper Abstract

Assessing and optimizing polarization performance in the context of ray-based optical design can be challenging. We describe an approach to this problem that decouples polarization effects from optical system geometry for reflective systems. Each surface's polarization properties are parameterized in terms of their impact on retardance and diattenuation in the small angle-of-incidence limit, separating polarization assessment from the task of coating design. A low-resolution ray trace of the system is adequate to determine ray geometry at each interface, which can then be interpolated to rapidly evaluate net Jones Matrix pupil functions. Coating behavior can be easily varied using the ellipsometric parameters to investigate impacts and compensation. Desired values of these parameters can then be specified as constraints in coating design. Investigation with candidate telescope optical designs for LUVOIR show baseline root-mean-square wavefront errors in the nm range for the on-diagonal Jones matrix component, and throughputs of tens of parts per million. Promising possibilities for compensation using a purpose-designed coating on the secondary mirror are discussed, which reduce the on-diagonal wavefront error by a factor ~ 20, with accompanying but more modest reductions in coupling into off-diagonal terms.

Paper Details

Date Published: 17 September 2018
PDF: 11 pages
Proc. SPIE 10743, Optical Modeling and Performance Predictions X, 1074307 (17 September 2018); doi: 10.1117/12.2320759
Show Author Affiliations
Derek Sabatke, Ball Aerospace (United States)
J. Scott Knight, Ball Aerospace (United States)
Matthew R. Bolcar, NASA Goddard Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 10743:
Optical Modeling and Performance Predictions X
Mark A. Kahan; Marie B. Levine-West, Editor(s)

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