Image slicing with a twist: design and manufacturing of a prototype image slicer for ELT-PCS

Matthias Tecza; R. Elliot Meyer; Niranjan A. Thatte; Takashi Sukegawa; Tomonao Nakayasu; Masatsugu Koyama

doi:10.1117/12.2629845

29 August 2022 Image slicing with a twist: design and manufacturing of a prototype image slicer for ELT-PCS

Matthias Tecza, R. Elliot Meyer, Niranjan A. Thatte, Takashi Sukegawa, Tomonao Nakayasu, Masatsugu Koyama

Proceedings Volume 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V; 121882S (2022) https://doi.org/10.1117/12.2629845
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

Integral fields units such as lenslet-arrays, fibre-bundles or image-slicers all suffer from inefficient over-sampling of the spatial PSF unless anamorphic magnifying optics are used, which adds optical aberrations, and reduces optical throughput. In 2014 we presented the novel twisted image slicer concept that produces fully Nyquist-sampled data cubes without the use of anamorphic optics; in this paper we present the opto-mechanical design of a prototype twisted image slicer, its nominal performance, and preliminary characterisation results. The image slicer, manufactured by Canon Inc., will be used with a test-bench integral field spectrograph as part of the R&D activities for the Planetary Camera and Spectrograph (PCS) for the Extremely Large Telescope (ELT). First interferometric measurements indicate a very good surface figure with a figure error smaller than 100 nm P-V. Preliminary spectra taken with the test-bench spectrograph suggest that the twisted slicer concept does indeed achieve Nyquist sampling in both spatial directions as well as along the spectral axis.

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Matthias Tecza, R. Elliot Meyer, Niranjan A. Thatte, Takashi Sukegawa, Tomonao Nakayasu, and Masatsugu Koyama "Image slicing with a twist: design and manufacturing of a prototype image slicer for ELT-PCS", Proc. SPIE 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V, 121882S (29 August 2022); https://doi.org/10.1117/12.2629845

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