Modeling polarization effects in nulling interferometers

Details Modeling polarization effects in nulling interferometers Modeling polarization effects in nulling interferometers

Nov 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spie.5170...91e&link_type=abstract

Techniques and Instrumentation for Detection of Exoplanets. Edited by Coulter, Daniel R. Proceedings of the SPIE, Volume 5170,

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Polarization plays a significant role in nulling interferometry and should be considered early in the instrument design process. In this paper, I demonstrate that mirror trains with near-normal incidence angles increase the leakage into the central null more than other mirror trains for a given amount of misalignment perpendicular to the incidence plane. Also, throughput and polarization non-uniformity across a wave front will significantly increase the leakage. To simplify top-level modeling of this effect, I derive a "throughput/polarization" version of the Strehl ratio.

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