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Diffraction modeling of finite subband EFC probing on dark hole contrast with WFIRST-CGI shaped pupil coronagraph

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dc.contributor.author Zhou, Hanying
dc.contributor.author Krist, John
dc.contributor.author Nemati, Bijan
dc.date.accessioned 2019-05-21T20:34:12Z
dc.date.available 2019-05-21T20:34:12Z
dc.date.issued 2016-06-26
dc.identifier.citation SPIE Astronomical Telescopes + Instrumentation 2016, Edinburgh, Scotland, June 26 - July 1, 2016 en_US
dc.identifier.clearanceno 16-2487
dc.identifier.uri http://hdl.handle.net/2014/46131
dc.description.abstract The current NASA WFIRST (Wide-Field InfraRed Survey Telescope) coronagraph instrument (CGI) design allocates two subband filters per each full science band in order to contain system complexity and cost. We present our detailed investigation results on the adequacy of such a limited number of finite subband filters in achieving broadband dark hole contrast with a shaped pupil coronagraph (SPC). The study is based on diffraction propagation modeling with realistic WFIRST optics, where each subband’s image plane electric field is estimated from pairwise pupil plane deformable mirror (DM) probing and image plane intensity averaging of the resulting fields of multiple (subband) wavelengths. Multiple subband choices and probing and control strategies are explored, including standard subband probing; mixed wavelength and/or weighted Jacobian matrix; subband probing with intensity subtraction; and extended subband probing with intensity subtraction. Overall, the investigation shows that the achievable contrast with a limited number of finite subbands is about 2~2.5x worse than the designed contrast for the current SPC. The result suggests that future shaped pupil designs should be optimized for slightly broader bandwidths than the intended science bandpasses if limited subbands are used for wavefront sensing via probing. 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, 2016 en_US
dc.subject diffraction modeling en_US
dc.subject coronagraph en_US
dc.subject shaped pupil coronagraph en_US
dc.subject Electric Field Conjugation algorithm en_US
dc.subject wavefront sensing and control en_US
dc.subject EFC probing en_US
dc.subject WFIRST en_US
dc.title Diffraction modeling of finite subband EFC probing on dark hole contrast with WFIRST-CGI shaped pupil coronagraph en_US
dc.type Preprint en_US


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