Optical design and predicted performance of the WFIRST phase-b imaging optics assembly and wide field instrument

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

doi:10.1117/12.2325859

17 September 2018 Optical design and predicted performance of the WFIRST phase-b imaging optics assembly and wide field instrument

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

Author Affiliations +

Proceedings Volume 10745, Current Developments in Lens Design and Optical Engineering XIX; 107450K (2018) https://doi.org/10.1117/12.2325859
Event: SPIE Optical Engineering + Applications, 2018, San Diego, California, United States

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.

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Bert A. Pasquale, Thomas Casey, Catherine Marx, Guangjun Gao, Nerses Armani, David Content, John Hagopian, Alden Jurling, Clifton Jackson, Alice Liu, Art Whipple, and Jacob Murray "Optical design and predicted performance of the WFIRST phase-b imaging optics assembly and wide field instrument", Proc. SPIE 10745, Current Developments in Lens Design and Optical Engineering XIX, 107450K (17 September 2018); https://doi.org/10.1117/12.2325859

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