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WFIRST Coronagraph: Digging Dark-Holes with Partially Corrected Pupil Phase

Show simple item record Sidick, Erkin Krist, John Poberezhskiy, Ilya 2020-05-12T17:19:03Z 2020-05-12T17:19:03Z 2018-06-12
dc.identifier.citation SPIE Astronomical Telescopes + Instrumentation, Austin, Texas, June 12 - 14, 2018 en_US
dc.identifier.clearanceno 18-2973
dc.description.abstract The WFIRST coronagraph employs two sequential deformable mirrors to compensate for phase and amplitude errors in the coronagraph optical system. In such a system the actuators of the deformable mirrors would be used for two purposes: To flatten the overall wavefront errors at a system pupil, and to create "dark-holes". The actuators have limited stroke ranges. Therefore, if the pupil phase errors are relatively large, flattening them completely could use up a significant portion of the actuator stroke, sometimes leaving insufficient stroke for creating the dark-holes. We have investigated the impact of partially-corrected pupil phase errors on a Hybrid Lyot Coronagraph (HLC) broadband contrast performance. The predicted broadband contrast floor and the contrast chromaticity agree well with those measured on the HLC testbed. en_US
dc.description.sponsorship NASA/JPL en_US
dc.language.iso en_US en_US
dc.publisher Pasadena, CA: Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2018 en_US
dc.subject Coronagraphy en_US
dc.subject adaptive optics en_US
dc.subject deformable mirrors en_US
dc.subject space telescopes en_US
dc.subject exoplanets en_US
dc.title WFIRST Coronagraph: Digging Dark-Holes with Partially Corrected Pupil Phase en_US
dc.type Preprint en_US

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