9 August 2016 Wide-Field InfraRed Survey Telescope (WFIRST) slitless spectrometer: design, prototype, and results
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Abstract
The slitless spectrometer plays an important role in the WFIRST mission for the survey of emission-line galaxies. This will be an unprecedented very wide field, HST quality 3D survey of emission line galaxies1. The concept of the compound grism as a slitless spectrometer has been presented previously. The presentation briefly discusses the challenges and solutions of the optical design, and recent specification updates, as well as a brief comparison between the prototype and the latest design. However, the emphasis of this paper is the progress of the grism prototype: the fabrication and test of the complicated diffractive optical elements and powered prism, as well as grism assembly alignment and testing. Especially how to use different tools and methods, such as IR phase shift and wavelength shift interferometry, to complete the element and assembly tests. The paper also presents very encouraging results from recent element tests to assembly tests. Finally we briefly touch the path forward plan to test the spectral characteristic, such as spectral resolution and response.
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Qian Gong, Qian Gong, David A. Content, David A. Content, Margaret Dominguez, Margaret Dominguez, Thomas Emmett, Thomas Emmett, Ulf Griesmann, Ulf Griesmann, John Hagopian, John Hagopian, Jeffrey Kruk, Jeffrey Kruk, Catherine Marx, Catherine Marx, Bert Pasquale, Bert Pasquale, Thomas Wallace, Thomas Wallace, Arthur Whipple, Arthur Whipple, "Wide-Field InfraRed Survey Telescope (WFIRST) slitless spectrometer: design, prototype, and results", Proc. SPIE 9904, Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave, 990412 (9 August 2016); doi: 10.1117/12.2231665; https://doi.org/10.1117/12.2231665
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