Prototype imaging spectrograph for coronagraphic exoplanet studies (PISCES) for WFIRST/AFTA

Qian Gong; Michael McElwain; Bradford Greeley; Bryan Grammer; Catherine Marx; Nargess Memarsadeghi; Karl Stapelfeldt; George Hilton; Jorge Llop Sayson; Marshall Perrin; Richard Demers; Hong Tang; Brian Kern; Janan Ferdosi

doi:10.1117/12.2187122

11 September 2015 Prototype imaging spectrograph for coronagraphic exoplanet studies (PISCES) for WFIRST/AFTA

Qian Gong, Michael McElwain, Bradford Greeley, Bryan Grammer, Catherine Marx, Nargess Memarsadeghi, Karl Stapelfeldt, George Hilton, Jorge Llop Sayson, Marshall Perrin, Richard Demers, Hong Tang, Brian Kern, Janan Ferdosi

Author Affiliations +

Proceedings Volume 9605, Techniques and Instrumentation for Detection of Exoplanets VII; 96050G (2015) https://doi.org/10.1117/12.2187122
Event: SPIE Optical Engineering + Applications, 2015, San Diego, California, United States

Abstract

Prototype Imaging Spectrograph for Coronagraphic Exoplanet Studies (PISCES) is a lenslet array based integral field spectrometer (IFS) designed for high contrast imaging of extrasolar planets. PISCES will be used to advance the technology readiness of the high contrast IFS baselined on the Wide-Field InfraRed Survey Telescope/Astrophysics Focused Telescope Assets (WFIRST-AFTA) coronagraph instrument. PISCES will be integrated into the high contrast imaging testbed (HCIT) at the Jet Propulsion Laboratory (JPL) and will work with both the Hybrid Lyot Coronagraph (HLC) and the Shaped Pupil Coronagraph (SPC) configurations. We discuss why the lenslet array based IFS was selected for PISCES. We present the PISCES optical design, including the similarities and differences of lenslet based IFSs to normal spectrometers, the trade-off between a refractive design and reflective design, as well as the specific function of our pinhole mask on the back surface of the lenslet array to reduce the diffraction from the edge of the lenslets. The optical analysis, alignment plan, and mechanical design of the instrument will be discussed.

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Qian Gong, Michael McElwain, Bradford Greeley, Bryan Grammer, Catherine Marx, Nargess Memarsadeghi, Karl Stapelfeldt, George Hilton, Jorge Llop Sayson, Marshall Perrin, Richard Demers, Hong Tang, Brian Kern, and Janan Ferdosi "Prototype imaging spectrograph for coronagraphic exoplanet studies (PISCES) for WFIRST/AFTA", Proc. SPIE 9605, Techniques and Instrumentation for Detection of Exoplanets VII, 96050G (11 September 2015); https://doi.org/10.1117/12.2187122

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