Florian JansenSummaryAffiliation: Friedrich Schiller University Country: Germany Publications
| Collaborators
|
Detail Information
Publications
Thermally induced waveguide changes in active fibersFlorian Jansen
Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller Universitat Jena, Albert Einstein Str 15, 07745 Jena, Germany
Opt Express 20:3997-4008. 2012..Furthermore, the strength of the actual index change is experimentally estimated, and its use to overcome avoided crossings is discussed and experimentally demonstrated...
Modeling the inhibition of stimulated Raman scattering in passive and active fibers by lumped spectral filters in high power fiber laser systemsFlorian Jansen
Institute of Applied Physics, Friedrich Schiller University of Jena, Jena, Germany
Opt Express 17:16255-65. 2009..This study provides guidelines for the use of spectral filtering elements, such as long period gratings, for Raman scattering inhibition in real-world high power fiber amplifiers...- The influence of index-depressions in core-pumped Yb-doped large pitch fibersFlorian Jansen
Institute of Applied Physics, Friedrich Schiller University of Jena, Jena, Germany
Opt Express 18:26834-42. 2010..The most promising design is evaluated in terms of mode area scaling with a view to mode field diameters above 100 µm. Detailed requirements on the accuracy of the core index matching are deduced... - Avoided crossings in photonic crystal fibersFlorian Jansen
Institute of Applied Physics, Friedrich Schiller Universitat Jena, Jena, Germany
Opt Express 19:13578-89. 2011..It is pointed out that an inappropriate choice of pump core diameter, bending radius and/or index depression may lead to avoided crossings that manifest themselves in unwanted deformations of the output beam... - Temperature-induced index gratings and their impact on mode instabilities in high-power fiber laser systemsCesar Jauregui
Friedrich Schiller University Jena, Institute of Applied Physics, Albert Einstein Str 15, 07745 Jena, Germany
Opt Express 20:440-51. 2012..The relevance of such gratings in the context of the recently observed mode instabilities of high-power fiber laser systems is discussed... - Preferential gain photonic-crystal fiber for mode stabilization at high average powersTino Eidam
Friedrich Schiller University Jena, Institute of Applied Physics, Jena, Germany
Opt Express 19:8656-61. 2011..In a chirped-pulse amplification system we extracted up to 303 W of average power from this fiber with a measured M2 value of 1.4... - Experimental observations of the threshold-like onset of mode instabilities in high power fiber amplifiersTino Eidam
Friedrich Schiller University Jena, Institute of Applied Physics, Jena, Germany
Opt Express 19:13218-24. 2011..Although the physical origin of this effect is not yet fully understood, we discuss possible explanations. Accordingly, several solutions are proposed in this paper to raise the threshold of this effect... - Temporal dynamics of mode instabilities in high-power fiber lasers and amplifiersHans Jürgen Otto
Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller Universitat Jena, Albert Einstein Str 15, 07745 Jena, Germany
Opt Express 20:15710-22. 2012..Finally, it is experimentally shown that the larger the mode-field area, the slower the mode-instability fluctuation is. The observations support the thermal origin of mode instabilities... - Physical origin of mode instabilities in high-power fiber laser systemsCesar Jauregui
Friedrich Schiller Universitat Jena, Institute of Applied Physics, Abbe Center of Photonics, Albert Einstein Str 15, 07745 Jena, Germany
Opt Express 20:12912-25. 2012..As it is discussed in the paper, this description of mode instabilities can explain many of the experimental observations reported to date... - Non-hexagonal Large-Pitch Fibers for enhanced mode discriminationFabian Stutzki
Friedrich Schiller University Jena, Institute of Applied Physics, Albert Einstein Str 15, 07745 Jena, Germany
Opt Express 19:12081-6. 2011..It is shown that a pentagonal design can increase the mode discrimination and, simultaneously, also improve the beam quality of Large-Pitch Fibers with mode field diameters well beyond 100 µm... - 135 W average-power femtosecond pulses at 520 nm from a frequency-doubled fiber laser systemJan Rothhardt
Friedrich Schiller University Jena, Institute of Applied Physics, Jena, Germany
Opt Lett 36:316-8. 2011..2. To our knowledge, the system presented here is the highest average power green laser source generating femtosecond pulses with diffraction-limited beam quality... - 26 mJ, 130 W Q-switched fiber-laser system with near-diffraction-limited beam qualityFabian Stutzki
Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller Universitat Jena, Jena, Germany
Opt Lett 37:1073-5. 2012..This record performance is enabled by a large-pitch fiber with a core diameter of 135 µm. This fiber allows for effective single-mode operation with mode field diameters larger than 90 µm even at average output powers exceeding 100 W... - High average and peak power femtosecond large-pitch photonic-crystal-fiber laserMartin Baumgartl
Friedrich Schiller University Jena, Institute of Applied Physics, Albert Einstein Strasse 15, 07745 Jena, Germany
Opt Lett 36:244-6. 2011..57 MHz repetition rate, resulting in 534 nJ of pulse energy. The laser produces positively chirped 2 ps output pulses, which are compressed down to sub-100 fs, leading to pulse peak powers as high as 3.2 MW... - High-speed modal decomposition of mode instabilities in high-power fiber lasersFabian Stutzki
Friedrich Schiller Universitat Jena, Institute of Applied Physics, Albert Einstein Str 15, 07745 Jena, Germany
Opt Lett 36:4572-4. 2011..These measurements confirm that energy transfer between the fluctuating transversal modes takes place in millisecond-time-scale... - High average power large-pitch fiber amplifier with robust single-mode operationFabian Stutzki
Friedrich Schiller University Jena, Institute of Applied Physics, Jena, Germany
Opt Lett 36:689-91. 2011..Compared to previous active large-mode area designs, the threshold of mode instabilities is increased by a factor of about 3... - High-power very large mode-area thulium-doped fiber laserFlorian Jansen
Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller Universitat Jena, Jena, Germany
Opt Lett 37:4546-8. 2012..In this Letter, we present the experimental realization of thulium-doped very large mode-area fibers based on the large-pitch fibers with record mode-field diameters exceeding 60 μm and delivering more than 52 W of output power... - Fiber chirped-pulse amplification system emitting 3.8 GW peak powerTino Eidam
Friedrich Schiller University Jena, Institute of Applied Physics, Jena, Germany
Opt Express 19:255-60. 2011..8 GW could be achieved by combining active phase shaping with an efficient reduction of the acquired nonlinear phase. Therefore, we used an Ytterbium-doped large-pitch fiber with a mode field diameter of 105 µm as the main amplifier...