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Proceedings Paper

Fabrication of metal mirror modules for snap-together VIS telescopes
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Paper Abstract

The assembly effort of an optical system naturally relies on the degrees of freedom and the maximum allowable tolerances each optical surface introduces into the overall budget. Snap-together approaches traditionally can be regarded as attractive solutions for IR systems having moderate tolerances, where the required precision is achieved by simultaneously machining optical surfaces and mounting interfaces in a single machine setup. Recent improvements in manufacturing and metrology enable a transfer of the assembly approach to shorter wavelength applications, where sub-aperture figuring techniques are used in combination with suitable amorphous polishing layers to achieve the increased requirements on figure and finish. A further decrease of the assembly effort is gained by machining several optical surfaces on common mechanical substrates and fixing the relative position with uncertainties as low as the machine precision. The article presents the fabrication of large electroless nickel coated aluminum mirror modules having two functional freeform surfaces and references for metrology and system integration. The modules are part of an all metal anamorphic imaging telescope operating in the visual spectral range. Presented methods open up a rapid and reliable assembly of metal mirror based VIS telescopes to be used in ground and space based astronomy or remote sensing applications.

Paper Details

Date Published: 11 October 2015
PDF: 9 pages
Proc. SPIE 9633, Optifab 2015, 963313 (11 October 2015); doi: 10.1117/12.2195897
Show Author Affiliations
Matthias Beier, Fraunhofer Institute for Applied Optics and Precision Engineering (Germany)
Friedrich-Schiller-Univ. Jena (Germany)
Johannes Hartung, Fraunhofer Institute for Applied Optics and Precision Engineering (Germany)
Jan Kinast, Fraunhofer Institute for Applied Optics and Precision Engineering (Germany)
Friedrich-Schiller-Univ. Jena (Germany)
Andreas Gebhardt, Fraunhofer Institute for Applied Optics and Precision Engineering (Germany)
Frank Burmeister, Fraunhofer Institute for Applied Optics and Precision Engineering (Germany)
Friedrich-Schiller-Univ. Jena (Germany)
Uwe D. Zeitner, Fraunhofer Institute for Applied Optics and Precision Engineering (Germany)
Friedrich-Schiller-Univ. Jena (Germany)
Stefan Risse, Fraunhofer Institute for Applied Optics and Precision Engineering (Germany)
Ramona Eberhardt, Fraunhofer Institute for Applied Optics and Precision Engineering (Germany)
Andreas Tünnermann, Fraunhofer Institute for Applied Optics and Precision Engineering (Germany)
Friedrich-Schiller-Univ. Jena (Germany)


Published in SPIE Proceedings Vol. 9633:
Optifab 2015
Julie L. Bentley; Sebastian Stoebenau, Editor(s)

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