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Conference Paper

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

MPS-Authors
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Bodendorf,  Christof
Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

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Geis,  Norbert
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

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Grupp,  Frank
Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

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Kaminski,  Jennifer
Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

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Katterloher,  Reinhard
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

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Bender,  Ralf
Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

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Citation

Bodendorf, C., Geis, N., Grupp, F., Kaminski, J., Katterloher, R., & Bender, R. (2019). Testing the near-infrared optical assembly of the space telescope Euclid. In T. B. Hull, K. Dae Wook, & P. Hallibert (Eds.), Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems II. doi:10.1117/12.2529114.


Cite as: http://hdl.handle.net/21.11116/0000-0006-619B-E
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.