From Event: SPIE Optical Engineering + Applications, 2017
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.
Jean-Michel Asfour, Frank Weidner, Christof Bodendorf, Andreas Bode, Alexander G. Poleshchuk, Ruslan K. Nasyrov, Frank Grupp, and Ralf Bender, "Diffractive optics for precision alignment of Euclid space telescope optics," Proc. SPIE 10401, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems, 104010V (Presented at SPIE Optical Engineering + Applications: August 09, 2017; Published: 30 October 2017); https://doi.org/10.1117/12.2274349.
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