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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
Manufacturing of a precision 3D microlens array on a steep curved substrate by injection molding process
Hao Zhang,Sebastian Scheiding,Lei Li,Andreas Gebhardt,Stefan Risse,Ramona Eberhardt,Andreas Tünnermann,Allen Y. Yi +7 more
TL;DR: In this article, a high volume low cost manufacturing method for microoptical microlens arrays on steep curved substrates using a microinjection molding technique was investigated, where the design of the individual lenslets was performed using ZEMAX and the mold inserts were machined using a voice coil based fast tool servo technique.
Patent
Apparatus and Method for Producing Short Radiation Pulses
TL;DR: In this paper, a method for producing short synchronous radiation pulses by means of an optically parametric oscillator was proposed. But this method requires the use of a non-linear wavelength converter and a coupling-out element.
Journal ArticleDOI
Fiber based high repetition rate, high energy laser source applying chirped pulse amplification
D. Nickel,Andreas Liem,Jens Limpert,Holger Zellmer,Uwe Griebner,Sonja Unger,Georg Korn,Andreas Tünnermann +7 more
TL;DR: In this paper, the authors demonstrate the potential of a high-gain Yb-fiber amplifier system to provide ultrashort pulses with high energies, achieving average powers of up to 22 W and single pulse energies up to 130 μJ.
Proceedings ArticleDOI
Fabrication technologies for chirped refractive microlens arrays
Frank Wippermann,Daniela Radtke,U. D. Zeitner,Jacques Duparré,Andreas Tünnermann,Martin Amberg,Stefan Sinzinger,Carsten Reinhardt,Aleksandr Ovsianikov,Boris N. Chichkov +9 more
TL;DR: In this paper, a chirped array consisting of individually shaped lenses which are defined by a parametric description of the cells optical function has been overcome by using 2-photon polymerization and laser lithography.
Proceedings ArticleDOI
Submicron accuracy optimization for laser beam soldering processes
Erik Beckert,Thomas Burkhardt,Marcel Hornaff,Andreas Kamm,Ingo Scheidig,Cornelia Stiehl,Ramona Eberhardt,Andreas Tünnermann,Andreas Tünnermann +8 more
TL;DR: In this article, it has been shown that micron accuracy and sub-micron reproducibility can be reached when using design-of-experiment optimized solder processes that are based on applying liquid solder drops ("Solder Bumping") onto metalized joining surfaces of optical components.