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Proceedings Paper

Hybrid lyot coronagraph for WFIRST: high contrast testbed demonstration in flight-like low flux environment
Author(s): Byoung-Joon Seo; Fang Shi; Bala Balasubramanian; Eric Cady; Brian Gordon; Brian Kern; Raymond Lam; David Marx; Dwight Moody; Richard Muller; Keith Patterson; Ilya Poberezhskiy; Camilo Mejia Prada; A.J. Eldorado Riggs; John Trauger; Daniel Wilson
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Paper Abstract

In order to validate required operation of the proposed Wide-Field InfraRed Survey Telescope (WFIRST) coronagraph instrument, we have built a testbed in Jet Propulsion Laboratory (JPL), which is analogous to the baseline WFIRST coronagraph instrument architecture. Since its birth in 2016, this testbed, named as Occulting Mask Coronagraph (OMC) testbed, has demonstrated several crucial technological milestones: Broadband high contrast demonstration in both Hybrid Lyot Coronagraph (HLC) and Shape Pupil Coronagraph (SPC) modes while the Low Order Wavefront Sensing and Control (LOWFS/C) subsystem senses and corrects the dynamic flight-like wavefront disturbances. In this paper, we present up-to-date progress of HLC mode demonstration in the OMC testbed. While injecting the flight-like low photon flux starlight with expected Line of Sight (LoS) and Wavefront Error (WFE) perturbation to the OMC testbed, we demonstrate generating high contrast dark hole images. We first study the expected photon flux in actual flight environment, and estimate detection noise and estimation accuracy of the complex electric field if the wavefront sensing algorithm is used based on the pair-wise difference imaging. Then, we introduce our improved scheme to mitigate this photon-starved flight-like low flux environment. As a result, we generate a dark hole that meets the WFIRST raw contrast requirements using the 2nd magnitude star light. We establish the key ideas, describe test setups, and demonstrate test results with data analysis.

Paper Details

Date Published: 22 August 2018
PDF: 12 pages
Proc. SPIE 10698, Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave, 106982P (22 August 2018); doi: 10.1117/12.2314358
Show Author Affiliations
Byoung-Joon Seo, Jet Propulsion Lab. (United States)
Fang Shi, Jet Propulsion Lab. (United States)
Bala Balasubramanian, Jet Propulsion Lab. (United States)
Eric Cady, Jet Propulsion Lab. (United States)
Brian Gordon, Jet Propulsion Lab. (United States)
Brian Kern, Jet Propulsion Lab. (United States)
Raymond Lam, Jet Propulsion Lab. (United States)
David Marx, Jet Propulsion Lab. (United States)
Dwight Moody, Jet Propulsion Lab. (United States)
Richard Muller, Jet Propulsion Lab. (United States)
Keith Patterson, Jet Propulsion Lab. (United States)
Ilya Poberezhskiy, Jet Propulsion Lab. (United States)
Camilo Mejia Prada, Jet Propulsion Lab. (United States)
A.J. Eldorado Riggs, Jet Propulsion Lab. (United States)
John Trauger, Jet Propulsion Lab. (United States)
Daniel Wilson, Jet Propulsion Lab. (United States)


Published in SPIE Proceedings Vol. 10698:
Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave
Makenzie Lystrup; Howard A. MacEwen; Giovanni G. Fazio; Natalie Batalha; Nicholas Siegler; Edward C. Tong, Editor(s)

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