Prediction and evaluation of the image of the WFIRST coronagraph pupil at the shaped-pupil mask

David Marx; Brian Kern; John Krist; Bala Balasubramanian; A. J. Eldorado Riggs; Byoung-Joon Seo; Eric Cady; Hong Tang; Camilo Prada; Garreth Ruane; Fang Shi; Charley Noecker; Blake Crowther

doi:10.1117/12.2562629

13 December 2020 Prediction and evaluation of the image of the WFIRST coronagraph pupil at the shaped-pupil mask

David Marx, Brian Kern, John Krist, Bala Balasubramanian, A. J. Eldorado Riggs, Byoung-Joon Seo, Eric Cady, Hong Tang, Camilo Prada, Garreth Ruane, Fang Shi, Charley Noecker, Blake Crowther

Author Affiliations +

Proceedings Volume 11443, Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave; 1144339 (2020) https://doi.org/10.1117/12.2562629
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

To create a high contrast field of view with a shaped pupil coronagraph (SPC), the telescope pupil is imaged onto the shaped pupil mask, the shaped pupil mask is designed and fabricated through a design optimization based on a given pupil wavefront, and deformable mirrors (DM) in the coronagraph are modulated according to a nonlinear optimization procedure. Both the mask design optimization and the DM optimization require accurate knowledge of the image of the pupil at the shaped pupil plane for the calculation of Jacobians, and the evaluation of alignment tolerances. The shaped pupil coronagraphs demonstrated in the high contrast imaging testbed (HCIT) at JPL has heretofore assumed perfect imaging of the pupil onto the shaped pupil mask. Similarly, the design and performance modeling of the WFIRST CGI instrument makes the same assumption. In this paper we estimate and compare the image of the pupil mask at the shaped pupil plane in the case of the coronagraph testbed, and the image of the telescope pupil at the shaped pupil plane for the WFIRST CGI instrument. The estimated pupil images include field curvature and aberrations resulting from the layout of the parabolic mirror imaging system, which is optimized for the source image, not the image of the pupil. We also show the results of direct measurement of the image of the pupil mask at the shaped pupil plane in the coronagraph testbed.

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David Marx, Brian Kern, John Krist, Bala Balasubramanian, A. J. Eldorado Riggs, Byoung-Joon Seo, Eric Cady, Hong Tang, Camilo Prada, Garreth Ruane, Fang Shi, Charley Noecker, and Blake Crowther "Prediction and evaluation of the image of the WFIRST coronagraph pupil at the shaped-pupil mask", Proc. SPIE 11443, Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave, 1144339 (13 December 2020); https://doi.org/10.1117/12.2562629

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