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Andreas Tünnermann
Researcher at Fraunhofer Society
Publications - 1757
Citations - 48543
Andreas Tünnermann is an academic researcher from Fraunhofer Society. The author has contributed to research in topics: Fiber laser & Laser. The author has an hindex of 97, co-authored 1738 publications receiving 43757 citations. Previous affiliations of Andreas Tünnermann include Schiller International University & University of Jena.
Papers
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Journal ArticleDOI
On the Properties of Nanoporous SiO2 Films for Single Layer Antireflection Coating
Lilit Ghazaryan,Lilit Ghazaryan,Yusuf Sekman,Yusuf Sekman,Sven Schröder,Christian Mühlig,Igor Stevanovic,Roelene Botha,Morteza Aghaee,Mariadriana Creatore,Andreas Tünnermann,Andreas Tünnermann,Adriana Szeghalmi,Adriana Szeghalmi +13 more
TL;DR: In this article, a single layer antireflection coatings (SLAR) consisting of nanoporous silica (NP SiO2) films are developed by selective chemical etching of atomic layer deposited (ALD) Al2O3:SiO2 composite films.
Proceedings ArticleDOI
Fabrication of metal mirror modules for snap-together VIS telescopes
Matthias Beier,Matthias Beier,Johannes Hartung,Jan Kinast,Jan Kinast,Andreas Gebhardt,Frank Burmeister,Frank Burmeister,Uwe D. Zeitner,Uwe D. Zeitner,Stefan Risse,Ramona Eberhardt,Andreas Tünnermann,Andreas Tünnermann +13 more
TL;DR: In this paper, the fabrication of large electroless nickel coated aluminum mirror modules having two functional freeform surfaces and references for metrology and system integration is presented. The modules are part of an all metal anamorphic imaging telescope operating in the visual spectral range.
Proceedings ArticleDOI
Fabrication and evaluation of a 500 W cladding-light stripper
A. Kliner,K.-Ch. Hou,Marco Plötner,Ch. Hupel,Th. Stelzner,Thomas Schreiber,Ramona Eberhardt,Andreas Tünnermann +7 more
TL;DR: In this article, a polymer-free cladding-light stripper was used to remove 500W of residual light from a double-cladding fiber without deteriorating, and the stripping efficiency was >20 dB for high-NA light and 6 dB for low-na light.
Journal ArticleDOI
Rotationally symmetric formulation of the wave propagation method-application to the straylight analysis of diffractive lenses.
TL;DR: An excellent accuracy is found, while comparing to rigorous simulations, which justifies the ability to overcome the limitations of the thin-element approximation.
Journal ArticleDOI
Investigation of mechanical interactions between the tips of two scanning near-field optical microscopes
TL;DR: In this paper, a method to monitor the distance between two tips of a scanning near-field optical microscope setup is described, where the interaction between the two tips, caused by shear forces and air pressure oscillations between the tips, makes each oscillating tip perform an additional oscillation at the frequency of the other tip.