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Ultra-precisely manufactured mirror assemblies with well-defined reference structures

: Scheiding, S.; Damm, C.; Holota, W.; Peschel, T.; Gebhardt, A.; Risse, S.; Tünnermann, A.


Atad-Ettedgui, E. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Modern Technologies in Space- and Ground-based Telescopes and Instrumentation : 27 June - 2 July 2010, San Diego, California, United States
Bellingham, WA: SPIE, 2010 (Proceedings of SPIE 7739)
ISBN: 978-0-8194-8229-7
Paper 773908
Conference "Modern Technologies in Space- and Ground-based Telescopes and Instrumentation" <2010, San Diego/Calif.>
Conference Paper
Fraunhofer IOF ()
metal mirror; diamond turning; mirror assembly; mirror alignment; system integration; Three Mirror Anastigmat Telescope (TMA); Korsch Telescope; infrared telescope

Aspherical surfaces for imaging or spectroscopy are a centerpiece of high-performance optics. Due to the high alignment sensitivity of aspheric surfaces, reference elements and interfaces with a tight geometrical relation to the mirror are as important as the high quality of the optical surface itself.
The developed manufacturing method, which accounts for the shape and also for the position of the mirror surfaces, allows controlling and precisely correcting not only the form, but also the alignment of reference marks, interfaces or even other mirrors in the sub-assembly using diamond turning. For Korsch or TMA telescopes it is also possible to diamond turn whole sub-assemblies containing two or more mirrors with a relative position error as low as the machine precision. Reference elements allow the correction of the shape and position of mirrors as well as the position of interfaces for system integration. The presented method opens up a novel manufacturing strategy to enhance the relative positioning accuracy of optic assemblies by one order of magnitude.