Testing the near-infrared optical assembly of the space telescope Euclid

Christof Bodendorf; Norbert Geis; Frank Grupp; Jennifer Kaminski; Reinhard Katterloher; Ralf Bender

doi:10.1117/12.2529114

9 September 2019 Testing the near-infrared optical assembly of the space telescope Euclid

Christof Bodendorf, Norbert Geis, Frank Grupp, Jennifer Kaminski, Reinhard Katterloher, Ralf Bender

Proceedings Volume 11116, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems II; 111160Y (2019) https://doi.org/10.1117/12.2529114
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States

Abstract

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.

Conference Presentation

Citation Download Citation

Christof Bodendorf, Norbert Geis, Frank Grupp, Jennifer Kaminski, Reinhard Katterloher, and 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

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