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Proceedings Paper

Optical design and predicted performance of the WFIRST phase-b imaging optics assembly and wide field instrument
Author(s): Bert A. Pasquale; Thomas Casey; Catherine Marx; Guangjun Gao; Nerses Armani; David Content; John Hagopian; Alden Jurling; Clifton Jackson; Alice Liu; Art Whipple; Jacob Murray
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Paper Abstract

Now in Phase-B, the architecture of the Wide-Field Infra-Red Survey Telescope (WFIRST) payload has matured since 2013 to accommodate various opto-mechanical constraints. Based on a 2.4-meter aperture Forward Optical Assembly (FOA), the Imaging Optics Assembly (IOA) provides corrected optical fields to each on-board instrument. Using a Three Mirror Anastigmat (TMA) optical design, the Wide-Field Channel (WFC) provides ~1/3-square degree of instantaneous field coverage at 0.11 arcsecond pixel scale. The WFC as-built predictive analysis anticipates near diffraction-limited imaging over a focal plane of 300.8 million pixels, operating in seven panchromatic bands between 0.48 – 2.0μm, or a 1-octive multi-spectral imaging mode from ~0.95-1.93μm. The IOA provides the Coronagraph Instrument (CGI) a collimated beam with very specific wavefront constraints. We present configuration changes since 2013 that improved interfaces, improved testability, and reduced technical risk. We provide an overview of our Integrated Modeling results, performed at an unprecedented level for a phase-A study, to illustrate performance margins with respect to static wavefront error, jitter, and thermal drift.

Paper Details

Date Published: 17 September 2018
PDF: 11 pages
Proc. SPIE 10745, Current Developments in Lens Design and Optical Engineering XIX, 107450K (17 September 2018); doi: 10.1117/12.2325859
Show Author Affiliations
Bert A. Pasquale, NASA Goddard Space Flight Ctr. (United States)
Thomas Casey, AS&D, Inc. (United States)
Catherine Marx, NASA Goddard Space Flight Ctr. (United States)
Guangjun Gao, Sigma Space Inc. (United States)
Nerses Armani, SGT Inc. (United States)
David Content, NASA Goddard Space Flight Ctr. (United States)
John Hagopian, ATA Aerospace, Inc. (United States)
Alden Jurling, NASA Goddard Space Flight Ctr. (United States)
Clifton Jackson, SGT Inc. (United States)
Alice Liu, NASA Goddard Space Flight Ctr. (United States)
Art Whipple, Conceptual Analytics, LLC (United States)
Jacob Murray, Rose-Hulman Institute of Technology (United States)

Published in SPIE Proceedings Vol. 10745:
Current Developments in Lens Design and Optical Engineering XIX
R. Barry Johnson; Virendra N. Mahajan; Simon Thibault, Editor(s)

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