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Proceedings Paper

Prototype imaging spectrograph for coronagraphic exoplanet studies (PISCES) for WFIRST/AFTA
Author(s): 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
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Paper 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.

Paper Details

Date Published: 11 September 2015
PDF: 16 pages
Proc. SPIE 9605, Techniques and Instrumentation for Detection of Exoplanets VII, 96050G (11 September 2015); doi: 10.1117/12.2187122
Show Author Affiliations
Qian Gong, NASA Goddard Space Flight Ctr. (United States)
Michael McElwain, NASA Goddard Space Flight Ctr. (United States)
Bradford Greeley, NASA Goddard Space Flight Ctr. (United States)
Bryan Grammer, Design Interface (United States)
Catherine Marx, NASA Goddard Space Flight Ctr. (United States)
Nargess Memarsadeghi, NASA Goddard Space Flight Ctr. (United States)
Karl Stapelfeldt, NASA Goddard Space Flight Ctr. (United States)
George Hilton, Newton Engineering (United States)
Jorge Llop Sayson, Catholic Univ. of America (United States)
Marshall Perrin, Space Telescope Science Institute (United States)
Richard Demers, Jet Propulsion Lab. (United States)
Hong Tang, Jet Propulsion Lab. (United States)
Brian Kern, Jet Propulsion Lab. (United States)
Janan Ferdosi, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 9605:
Techniques and Instrumentation for Detection of Exoplanets VII
Stuart Shaklan, Editor(s)

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