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Design, Fabrication and Test of WFIRST-AFTA GRISM AssemblyThe Wide-Field Infra-Red Survey Telescope (WFIRST) is designed to perform wide-field imaging and slitless spectroscopic survey of the sky. A compound Grism assembly is selected as its slitless dispersing element. Compared to the grisms in several instruments installed on the Hubble space telescope, the challenge of this grism is the much wider Field Of View (FOV), larger dispersion, and smaller f. The image quality of the slitless spectrometer is directly related to how deep of the sky the spectrometer is able to see. This paper discusses how to use a diffractive lens surface to compensate the wavelength dependent aberration created by the grating in non-collimated space to make the spectrometer diffraction limited, as well as how to intelligently combine the two diffractive surfaces (lens and grating) to reduce the unwanted diffraction orders from the grating. The paper also discusses how to improve the diffraction efficiency of the diffractive surfaces, as well as how to align and assemble the optics.
Document ID
20140012668
Acquisition Source
Goddard Space Flight Center
Document Type
Presentation
Authors
Gong, Qian (NASA Goddard Space Flight Center Greenbelt, MD United States)
Content, David (NASA Goddard Space Flight Center Greenbelt, MD United States)
Kruk, Jeffrey (NASA Goddard Space Flight Center Greenbelt, MD United States)
Pasquale, Bert (NASA Goddard Space Flight Center Greenbelt, MD United States)
Wallace, Thomas (NASA Goddard Space Flight Center Greenbelt, MD United States)
Smith, Walter (NASA Goddard Space Flight Center Greenbelt, MD United States)
Date Acquired
September 26, 2014
Publication Date
April 30, 2014
Subject Category
Optics
Report/Patent Number
GSFC-E-DAA-TN15430
Meeting Information
Meeting: International Optical Design Conference (IODC)
Location: Kohala Coast, HI
Country: United States
Start Date: June 22, 2014
End Date: June 16, 2014
Sponsors: Optical Society of America
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Keywords
Diffractive Optics
GRISM
Slitless Spetrometer

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