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Development of the WFIRST CGI integral field spectrograph
Author(s): Tyler D. Groff; Neil Zimmerman; Maxime J. Rizzo; Samuel Gaylin; Nicholas Nicolaeff; John Titus; Rose Mountcastle; Qian Gong; David Harvey
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Paper Abstract

The principal science goal of directly imaging exoplanets is spectroscopy. Future mission concepts such as LU- VOIR and HabEx have baselined their science instruments to use an integral field spectrograph (IFS) to maximize observing efficiency. Coronagraphic imaging with an IFS has strong heritage at ground observatories, having produced planet and brown dwarf near-infrared spectra at contrast floors as low as high 1 × 10-6 levels. As a technology demonstration for future missions the WFIRST coronagraph instrument (CGI) will demonstrate the ability to measure spectra in visible light with at contrast levels sufficient for detecting Earth-like planets. The spectrograph was originally meant to match that of future missions; an independent IFS channel for wavefront control and imaging spectroscopy. Due to a series of de-scopes as the project progressed, the baseline spectroscopic capability of CGI is no longer an IFS but a zero deviation optical prism and slit used in conjunction with the direct imaging camera. Regardless, CGI advanced a lenslet IFS through the preliminary design phase of a flight project. Here we present that development as the challenges and requirements of an IFS for coronagraphy are quite unique and relevant to future missions. With that development in place, we also present the initial design of the zero optical deviation prism, highlighting the relative challenges and performance of each concept.

Paper Details

Date Published: 9 September 2019
PDF: 9 pages
Proc. SPIE 11117, Techniques and Instrumentation for Detection of Exoplanets IX, 111170D (9 September 2019); doi: 10.1117/12.2530731
Show Author Affiliations
Tyler D. Groff, NASA Goddard Space Flight Ctr. (United States)
Neil Zimmerman, NASA Goddard Space Flight Ctr. (United States)
Maxime J. Rizzo, NASA Goddard Space Flight Ctr. (United States)
Samuel Gaylin, Genesis Engineering Solutions, Inc. (United States)
Nicholas Nicolaeff, ATA Aerospace, LLC (United States)
John Titus, ATA Aerospace, LLC (United States)
Rose Mountcastle, Lentech Engineering (United States)
Qian Gong, NASA Goddard Space Flight Ctr. (United States)
David Harvey, Genesis Engineering Solutions, Inc. (United States)


Published in SPIE Proceedings Vol. 11117:
Techniques and Instrumentation for Detection of Exoplanets IX
Stuart B. Shaklan, Editor(s)

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