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Spectral and wavefront error performance of WFIRST/AFTA bandpass filter prototypes

机译：WFIRST / AFTA带通滤波器原型的光谱和波前误差性能

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The Cycle 5 design baseline for the Wide-Field Infrared Survey Telescope Astrophysics Focused Telescope Assets (WFIRST/AFTA) instrument includes a single wide-field channel (WFC) 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 presents and discusses filter performance, including spectral transmission and reflected/transmitted wavefront errors measurements, for a subset of the bandpass filter complement of the WFC instrument. The filters that are tested in this effort are the 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, out of band rejection (including the cut-on and cut-off slopes), and the impact the wavefront error distortions of these filters will have on the imaging performance of the wide-field channel in the WFIRST/AFTA observatory.
机译：广域红外勘测望远镜天体物理学聚焦望远镜资产（WFIRST / AFTA）仪器的第5周期设计基准包括用于成像和光谱学的单个广域通道（WFC）仪器。在科学观察期间，对于此宽视场通道，唯一的常规移动部件是元素轮（EW）组件。该滤光轮组件将有8个位置，其中将装有6个带通滤光片，一个空白位置和一个Grism组件，该组件将由一个三元素组件组成，以分散银河红移测量所不希望的中心波长。 EW组件中的所有元件均由熔融石英基底（直径110毫米）制成，该基底将根据过滤器名称（Z087，Y106，J129，H158，F184，W149和Grism）具有合适的带通涂层。本文介绍并讨论了WFC仪器带通滤波器互补子集的滤波器性能，包括光谱透射和反射/透射波前误差测量。为此进行测试的过滤器是Z087，W149和Grism。这些滤光片涂层是从三个不同的供应商处购买的，以评估带内吞吐量，带外抑制（包括导通和截止斜率）以及波前误差失真的影响方面最具挑战性的方面。这些滤镜将对WFIRST / AFTA天文台的宽视场成像性能产生影响。

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