F
Franz Beier
Researcher at Fraunhofer Society
Publications - 15
Citations - 343
Franz Beier is an academic researcher from Fraunhofer Society. The author has contributed to research in topics: Single-mode optical fiber & Fiber. The author has an hindex of 5, co-authored 15 publications receiving 269 citations.
Papers
More filters
Journal ArticleDOI
Single mode 4.3 kW output power from a diode-pumped Yb-doped fiber amplifier.
Franz Beier,Christian Hupel,Stefan Kuhn,Sigrun Hein,Johannes Nold,F Proske,Bettina Sattler,Andreas Liem,Cesar Jauregui,Jens Limpert,Nicoletta Haarlammert,Thomas Schreiber,Ramona Eberhardt,Andreas Tünnermann +13 more
TL;DR: A high slope efficiency of 90% with diffraction-limited beam quality and without any sign of TMI or stimulated Raman scattering for a spectral dynamic range of higher than -80 dB was obtained.
Journal ArticleDOI
Narrow linewidth, single mode 3 kW average power from a directly diode pumped ytterbium-doped low NA fiber amplifier
Franz Beier,Christian Hupel,Johannes Nold,Stefan Kuhn,Sigrun Hein,J Ihring,Bettina Sattler,Nicoletta Haarlammert,Thomas Schreiber,Ramona Eberhardt,Andreas Tünnermann +10 more
TL;DR: A newly designed and fabricated ytterbium-doped large mode area fiber with an extremely low NA and related systematic investigations on fiber parameters that crucially influence the mode instability threshold are reported on.
Journal ArticleDOI
Experimental investigations on the TMI thresholds of low-NA Yb-doped single-mode fibers
Franz Beier,Friedrich Möller,Bettina Sattler,Johannes Nold,Andreas Liem,Christian Hupel,Stefan Kuhn,Sigrun Hein,Nicoletta Haarlammert,Thomas Schreiber,Ramona Eberhardt,Andreas Tünnermann +11 more
TL;DR: This contribution investigates the transversal mode instability behavior of a ytterbium-doped commercial 20/400 fiber and obtains 2.9 kW of output power after optimizing the influencing parameters.
Journal ArticleDOI
Measuring thermal load in fiber amplifiers in the presence of transversal mode instabilities.
Franz Beier,Marco Plötner,Bettina Sattler,Fabian Stutzki,Till Walbaum,Andreas Liem,Nicoletta Haarlammert,T. Schreiber,Ramona Eberhardt,Andreas Tünnermann +9 more
TL;DR: Detailed in situ distributed temperature measurements inside a high power fiber amplifier show that photodarkening has a negligible impact on the thermal load and, therefore, on the TMI threshold in this fiber.
Journal ArticleDOI
High power sub-ps pulse generation by compression of a frequency comb obtained by a nonlinear broadened two colored seed
Marco Plötner,Victor Bock,Tim Schultze,Franz Beier,Thomas Schreiber,Ramona Eberhardt,Andreas Tünnermann +6 more
TL;DR: This work demonstrates the generation of a frequency comb of several nm widths with arbitrary frequency spacing by four-wave-mixing (FWM) of two external cavity lasers combined amplified in a high power large-mode area fiber amplifier.