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Verification and Calibration of Spectroscopy and Polarization modes for the Roman Coronagraph InstrumentAs part of its technology demonstration, the Nancy Grace Roman Space Telescope Coronagraph Instrument (CGI) will demonstrate point source spectroscopy and polarization measurements of disks. The spectroscopy mode is a zero-deviation Amici prism and slit to a confirmed planet after an imaging detection. The Wollaston prism polarization optics allow for imaging two orthogonal polarization states simultaneously. The CGI spectral characterization modes, designed and built at Goddard Space Flight Center (GSFC), have a spectral resolution of R50 in two 15% bandpass centered at 660nm and 730nm intended to capture key methane absorption features. There are duplicate Wollaston prism channels, clocked 45 degrees with respect to one another covering 10% bandpasses at 575 and 825nm, but the optics meet performance requirements across the full CGI bandpass. The Wollaston design and optical elements are a contribution by the Japanese Aerospace Exploration Agency, with final alignment and testing being done at GSFC. We highlight the requirements for these modes, the ground-to-orbit calibration process, and the operations required to use a deployable slit on a CGI point source in the presence of pointing error. We also provide further detail on the optomechanical design, testing results from the final as-built flight units, verification process, and performance of the as-built flight assemblies.
Document ID
20240000045
Acquisition Source
Goddard Space Flight Center
Document Type
Poster
Authors
Tyler D. Groff
(Goddard Space Flight Center Greenbelt, United States)
Neil T. Zimmerman
(Goddard Space Flight Center Greenbelt, United States)
Hari Subedi
(Goddard Space Flight Center Greenbelt, United States)
Evan Bray
(Orbital Sciences Corporation Dulles, Virginia, United States)
Michelle Woodland
(Southeastern Universities Research Association Washington D.C., District of Columbia, United States)
James Lyons
(Goddard Space Flight Center Greenbelt, United States)
Date Acquired
January 2, 2024
Subject Category
Optics
Meeting Information
Meeting: 243rd Meeting of the American Astronomical Society Meeting
Location: New Orleans, LA
Country: US
Start Date: January 7, 2024
End Date: January 11, 2024
Sponsors: American Astronomical Society
Funding Number(s)
WBS: 134180.05.05.06
Distribution Limits
Public
Copyright
Public Use Permitted.
Technical Review
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