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Euclid is a space telescope currently developed in the framework of the ESA Cosmic Vision 2015-2025 Program. It addresses fundamental cosmological questions related to dark matter and dark energy. The lens system of one of the two scientific key instruments [a combined near-infrared spectrometer and photometer (NISP)] was designed, built-up and tested at the Max Planck Institute for Extraterrestrial Physics (MPE). We present the final imaging quality of this diffraction-limited optical assembly with two complementary approaches, namely a point-spread function- and a Shack- Hartmann sensor-based wavefront measurement. The tests are performed under space operating conditions within a cryostat. The large field of view of Euclid’s wide-angle objective is sampled with a pivot arm, carrying a measurement telescope and the sensors. A sequence of highly accurate movements to several field positions is carried out by a large computer controlled hexapod. Both measurement approaches are compared among one another and with the corresponding simulations. They demonstrate in good agreement a solely diffraction limited optical performance over the entire field of view.
Christof Bodendorf,Norbert Geis,Frank Grupp,Jennifer Kaminski,Reinhard Katterloher, andRalf Bender
"Testing the near-infrared optical assembly of the space telescope Euclid", Proc. SPIE 11116, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems II, 111160Y (9 September 2019); https://doi.org/10.1117/12.2529114
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Christof Bodendorf, Norbert Geis, Frank Grupp, Jennifer Kaminski, Reinhard Katterloher, Ralf Bender, "Testing the near-infrared optical assembly of the space telescope Euclid," Proc. SPIE 11116, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems II, 111160Y (9 September 2019); https://doi.org/10.1117/12.2529114