Publications
│2013
Radiation damage to six selected optical materials
Grupp, F.; Geis, N.; Katterloher, R.; Bender, R.
Proc. SPIE. 8860, UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts VI, 88600N. (September 26, 2013) doi: 10.1117/12.2023252
Abstract: The ESA/EUCLID satellite is equipped with two instruments that are simultaneously observing patches of > 0:5 square degree on the sky. The VIS visual light high spacial resolution imager and the NISP near infrared spectrometer and photometer are separated by a di-chroic beam splitter.
The NISP Near Infrared Spectrometer and Photometer reduces the initial f/# 20 beam of the Korsch type telescope to an f/# 10 beam filling 16 Hawaii 2RG detectors on the NISP instrument focal plane by means of a four lens optical system.
With this paper we present tests on the radiation damage measured between 500 and 2000nm to six 25mm thick probes of optical materials potentially used in the NISP optics for the environmental conditions expected for a six years mission in the outer Lagrange point L2.
A tolerancing approach taking into account the interferometric alignment scheme of the EUCLID NISP space optics
Grupp, F.; Prieto, E.; Spano, P.; Geis, N.; Bode, A.; Katterloher, R.; Bodendorf, C.; Becker, M.; Bogner, S.; Bender, R.
Proc. SPIE 8860, UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts VI, 88600G (September 26, 2013); doi:10.1117/12.2023264
Abstract: The ESA/EUCLID satellite is equipped with two instruments that are simultaneously observing patches of < 0:5 square degree on the sky. The VIS visual light high spacial resolution imager and the NISP near infrared spectrometer and photometer are separated by a di-chroic beam splitter. The huge field of view, together with the enormous demands on the optical performance and in flight stability of the instruments and telescope lead to unique demands in post launch alignment. A very detailed, very well set up optical tolerance analysis is therefore one key point in the success of the mission. Design and alignment have to be optimized for best toleranced performance. This paper presents the baseline concept of the NISP instrument with its two observational modes being low resolution slit-less spectroscopy and three band J, H&K+ photometry. Special chapters deal with the alignment scheme and the derived tolerance approach which will be used towards the instrument PDR.