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Flight Integral Field Spectrograph (IFS) Optical Design for WFIRST Coronagraphic Exoplanet Demonstration
NTRS Full-Text: Click to View  [PDF Size: 1.2 MB]
Author and Affiliation:
Gong, Qian(NASA Goddard Space Flight Center, Greenbelt, MD United States);
Groff, Tyler D.(ASRC Federal Space and Defense, Greenbelt, MD, United States);
Zimmerman, Neil(NASA Goddard Space Flight Center, Greenbelt, MD United States);
Mandell, Avi(NASA Goddard Space Flight Center, Greenbelt, MD United States);
McElwain, Michael(NASA Goddard Space Flight Center, Greenbelt, MD United States);
Rizzo, Maxime(NASA Goddard Space Flight Center, Greenbelt, MD United States);
Saxena, Prabal(Universities Space Research Association, Greenbelt, MD, United States)
Abstract: Based on the experience from Prototype Imaging Spectrograph for Coronagraphic Exoplanet Studies (PISCES) for WFIRST, we have moved to the flight instrument design phase. The specifications for flight IFS have similarities and differences from the prototype. This paper starts with the science and system requirement, discusses a number of critical trade-offs: such as IFS type selection, lenslet array shape and layout versus detector pixel accuracy, how to accommodate the larger Field Of View (FOV) and wider wavelength band for a potential add-on StarShade occulter. Finally, the traditional geometric optical design is also investigated and traded: reflective versus refractive, telecentric versus non-telecentric relay. The relay before the lenslet array controls the chief angle distribution on the lenslet array. Our previous paper has addressed how the relay design combined with lenslet arraypinhole mask can further compress the residual star light and increase the contrast. Finally, a complete phase A IFS optical design is presented.
Publication Date: Aug 06, 2017
Document ID:
20170007446
(Acquired Aug 11, 2017)
Subject Category: OPTICS
Report/Patent Number: GSFC-E-DAA-TN44885
Document Type: Oral/Visual Presentation
Meeting Information: SPIE Optics + Photonics 2017; 6-10 Aug. 2017; San Diego, CA; United States
Meeting Sponsor: International Society for Optical Engineering; Bellingham, WA, United States
Contract/Grant/Task Num: NNG13CR48C; NNH15CO48B
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD United States
Description: 16p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Distribution as joint owner in the copyright
NASA Terms: CORONAGRAPHS; EXTRASOLAR PLANETS; FIELD OF VIEW; FLIGHT INSTRUMENTS; IMAGING TECHNIQUES; OPTICAL EQUIPMENT; SPECTROGRAPHS; PROTOTYPES; OCCULTATION; PIXELS
Other Descriptors: LENSLET ARRAY; INTEGRAL FIELD SPECTROGRAPH
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Last Modified: August 11, 2017
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