Spectral performance of WFIRST/AFTA bandpass filter prototypes

Manuel A. Quijada; Winson Huang; Kevin H. Miller; Laurie Seide; David Content; Jeffrey Kruk

doi:10.1117/12.2188496

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22 September 2015 Spectral performance of WFIRST/AFTA bandpass filter prototypes

Manuel A. Quijada, Winson Huang, Kevin H. Miller, Laurie Seide, David Content, Jeffrey Kruk

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Proceedings Volume 9602, UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts VII; 96020X (2015) https://doi.org/10.1117/12.2188496
Event: SPIE Optical Engineering + Applications, 2015, San Diego, California, United States

Abstract

The current baseline for the Wide-Field Infrared Survey Telescope Astrophysics Focused Telescope Assets (WFIRST/AFTA) instrument includes a single wide-field channel instrument for both imaging and spectroscopy. The only routinely moving part during scientific observations for this wide-field channel is the element wheel (EW) assembly. This filter-wheel assembly will have 8 positions that will be populated with 6 bandpass filters, a blank position, and a grism assembly that will consist of a three-element assembly to disperse the central wavelength undeviated for galaxy redshift surveys. All elements in the EW assembly will be made out of fused silica substrates (110 mm diameter) that will have the appropriate bandpass coatings according to the filter designations (Z087, Y106, J129, H158, F184, W149 and Grism). This paper will present and discuss spectral performance (including spectral transmission and surface-figure wavefront errors ) for a subset of the bandpass filter complement that include filters such as Z087, W149, and Grism. These filter coatings have been procured from three different vendors to assess the most challenging aspects in terms of the in-band throughput (> 95 %), out of band rejection (< 10⁻⁴), spatial uniformity (< 1% transmission level) and the cut-on and cut-off slopes (≈ 3% for the filters and 0.3% for the grism coatings).

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Manuel A. Quijada, Winson Huang, Kevin H. Miller, Laurie Seide, David Content, and Jeffrey Kruk "Spectral performance of WFIRST/AFTA bandpass filter prototypes", Proc. SPIE 9602, UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts VII, 96020X (22 September 2015); https://doi.org/10.1117/12.2188496

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