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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.
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Proceedings ArticleDOI
Towards MW Average Powers in Ultrafast High-Repetition-Rate Enhancement Cavities
Jan Kaster,Ioachim Pupeza,Tino Eidam,Christoph Jocher,Ernst E. Fill,Jens Limpert,Ronald Holzwarth,Birgitta Bernhardt,Thomas Udem,Theodor W. Hänsch,Andreas Tünnermann,Ferenc Krausz +11 more
TL;DR: In this article, the authors report on high power, ultrafast enhancement cavity designs with enlarged laser spots on the mirrors, together with a novel seeding Yb-fiber based CPA, MW-level average powers with sub-ps pulse durations come into reach.
Proceedings ArticleDOI
Ultrashort pulse laser drilling of metals using a high-repetition rate high average power fiber CPA system
Antonio Ancona,Cesar Jauregui,Sven Döring,Fabian Röser,Jens Limpert,Stefan Nolte,Andreas Tünnermann,Andreas Tünnermann +7 more
TL;DR: In this paper, an experimental study of the drilling of metal targets with ultrashort laser pulses with pulse durations from======800 fs to 19 ps at repetition rates up to 1 MHz, average powers up to 70 Watts, using an Ytterbium-doped fiber CPAINE system.
Journal ArticleDOI
Influence of seed layers on optical properties of aluminum in the UV range
Sven Stempfhuber,Nadja Felde,Stefan Schwinde,Marcus Trost,Paul Schenk,Sven Schröder,Andreas Tünnermann +6 more
TL;DR: The titanium-seeded aluminum coatings were stable at an elevated temperature of 225°C and showed no increase in surface roughness or pinholes and UV spectral reflectance measurements showed an average higher reflectivity for wavelengths from 120 nm to 200 nm.
Journal ArticleDOI
Stochastic subwavelength structures on poly(methyl methacrylate) surfaces for antireflection generated by plasma treatment.
TL;DR: A fixed gradient function for the refractive index is used for theRefractive index for reverse engineering of in situ measured broadband optical data, and the results with nonoptic methods are compared.
Journal ArticleDOI
Optical bandgap control in Al2O3/TiO2 heterostructures by plasma enhanced atomic layer deposition: Toward quantizing structures and tailored binary oxides.
Pallabi Paul,Md. Golam Hafiz,Paul Schmitt,Paul Schmitt,Christian Patzig,Felix Otto,Torsten Fritz,Andreas Tünnermann,Andreas Tünnermann,Adriana Szeghalmi,Adriana Szeghalmi +10 more
TL;DR: In this paper, an effective medium approximation (EMA) approach is applied to model the heterostructures theoretically, while the indirect bandgap is very sensitive to the thicknesses of the barrier and quantum well layers.