Segment-to-segment coating thickness variations on TMT, ELT, and GMT add only about 1e-8 raw contrast variation in high-contrast coronagraphy, negligible compared to nominal polarization aberrations and AO residuals.
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Polarization aberrations in next-generation Giant Segmented Mirror Telescopes (GSMTs). II. Influence of segment-to-segment coating variations on high-contrast imaging and polarimetry
Segment-to-segment coating thickness variations on TMT, ELT, and GMT add only about 1e-8 raw contrast variation in high-contrast coronagraphy, negligible compared to nominal polarization aberrations and AO residuals.