• DOI:10.1117/12.2529114
• Corpus ID: 198985962

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

@inproceedings{Bodendorf2019TestingTN,
  title={Testing the near-infrared optical assembly of the space telescope Euclid},
  author={Christof Bodendorf and Norbert Geis and Frank U. Grupp and Jennifer Kaminski and Reinhard O. Katterloher and Ralf Bender},
  booktitle={Optical Engineering + Applications},
  year={2019}
}

• C. Bodendorf, N. Geis, +3 authors R. Bender
• Published in
  Optical Engineering…
  30 July 2019
• Physics

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.