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Proceedings Paper

Diffractive optics for precision alignment of Euclid space telescope optics
Author(s): Jean-Michel Asfour; Frank Weidner; Christof Bodendorf; Andreas Bode; Alexander G. Poleshchuk; Ruslan K. Nasyrov; Frank Grupp; Ralf Bender
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Paper Abstract

We present a method for precise alignment of lens elements using specific Computer Generated Hologram (CGH) with an integrated Fizeau reference flat surface and a Fizeau interferometer. The method is used for aligning the so called Camera Lens Assembly for ESAs Euclid telescope. Each lens has a corresponding annular area on the diffractive optics, which is used to control the position of each lens. The lenses are subsequently positioned using individual annular rings of the CGH. The overall alignment accuracy is below 1 µm, the alignment sensitivity is in the range of 0.1 µm. The achieved alignment accuracy of the lenses relative to each other is mainly depending on the stability in time of the alignment tower. Error budgets when using computer generated holograms and physical limitations are explained. Calibration measurements of the alignment system and the typically reached alignment accuracies will be shown and discussed.

Paper Details

Date Published: 30 October 2017
PDF: 12 pages
Proc. SPIE 10401, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems, 104010V (30 October 2017); doi: 10.1117/12.2274349
Show Author Affiliations
Jean-Michel Asfour, Dioptic GmbH (Germany)
Frank Weidner, Dioptic GmbH (Germany)
Christof Bodendorf, Max Planck Institute for Extraterrestrial Physics (Germany)
Andreas Bode, Max Planck Institute for Extraterrestrial Physics (Germany)
Alexander G. Poleshchuk, Institute of Automation and Electrometry SB RAS (Russian Federation)
Ruslan K. Nasyrov, Institute of Automation and Electrometry SB RAS (Russian Federation)
Frank Grupp, Max Planck Institute for Extraterrestrial Physics (Germany)
Ralf Bender, Max Planck Institute for Extraterrestrial Physics (Germany)


Published in SPIE Proceedings Vol. 10401:
Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems
Tony B. Hull; Dae Wook Kim; Pascal Hallibert, Editor(s)

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