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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
Balancing of thermal lenses in enhancement cavities with transmissive elements
Nikolai Lilienfein,Henning Carstens,Simon Holzberger,Christoph Jocher,Tino Eidam,Jens Limpert,Andreas Tünnermann,Alexander Apolonski,Ferenc Krausz,Ioachim Pupeza +9 more
TL;DR: Using forced convection to fine-tune the lensing in the plate, average powers of up to 160 kW for 250-MHz-repetition-rate picosecond pulses with a power-independent mode size are achieved and the susceptibility of the cavity mode size to thermal lensing allows highly sensitive absorption measurements.
Journal ArticleDOI
Coupled grating reflectors with highly angular tolerant reflectance.
TL;DR: Stacked high-contrast grating reflectors with virtually angular independent reflectance for transverse-magnetic polarized light are reported on, with a reflectance of more than 96% in the entire angular spectrum.
Journal ArticleDOI
Control of higher-order cladding mode excitation with tailored femtosecond-written long period fiber gratings.
Maximilian Heck,Georg Schwartz,Ria G. Krämer,Daniel Richter,Thorsten A. Goebel,Christian Matzdorf,Andreas Tünnermann,Stefan Nolte +7 more
TL;DR: It is shown that the excitation of higher-order cladding modes with strong selectivity and high precision is possible in long period fiber gratings (LPFG), paving the way for a completely new class of tailored LPFGs for different fiber integrated devices.
Proceedings Article
Extended large-mode-area single-mode microstructured fiber laser
Jens Limpert,Andreas Liem,Thomas Schreiber,Stefan Nolte,Holger Zellmer,Andreas Tünnermann,Jes Broeng,A. Petersson,Ch. Jacobsen,H.R. Simonsen,Niels Asger Mortensen +10 more
TL;DR: In this paper, a real singlemode microstructured ytterbium-doped air-clad fiber with a mode-field-diameter as high as 45 mum and a pump light absorption of 16 dB/m was reported.
Journal ArticleDOI
Angular resolved power spectral density analysis for improving mirror manufacturing.
Tom Pertermann,Johannes Hartung,Matthias Beier,Marcus Trost,Sven Schröder,Stefan Risse,Ramona Eberhardt,Andreas Tünnermann,Herbert Gross +8 more
TL;DR: A new way of representing the two-dimensional power spectral density function is introduced in this paper and is utilized for the evaluation of an example freeform mirror.