Florian Jansen

Summary

Affiliation: Friedrich Schiller University
Country: Germany

Publications

  1. ncbi request reprint Thermally induced waveguide changes in active fibers
    Florian 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
  2. doi request reprint Modeling the inhibition of stimulated Raman scattering in passive and active fibers by lumped spectral filters in high power fiber laser systems
    Florian Jansen
    Institute of Applied Physics, Friedrich Schiller University of Jena, Jena, Germany
    Opt Express 17:16255-65. 2009
  3. doi request reprint The influence of index-depressions in core-pumped Yb-doped large pitch fibers
    Florian Jansen
    Institute of Applied Physics, Friedrich Schiller University of Jena, Jena, Germany
    Opt Express 18:26834-42. 2010
  4. doi request reprint Avoided crossings in photonic crystal fibers
    Florian Jansen
    Institute of Applied Physics, Friedrich Schiller Universitat Jena, Jena, Germany
    Opt Express 19:13578-89. 2011
  5. doi request reprint Temperature-induced index gratings and their impact on mode instabilities in high-power fiber laser systems
    Cesar Jauregui
    Friedrich Schiller University Jena, Institute of Applied Physics, Albert Einstein Str 15, 07745 Jena, Germany
    Opt Express 20:440-51. 2012
  6. doi request reprint Preferential gain photonic-crystal fiber for mode stabilization at high average powers
    Tino Eidam
    Friedrich Schiller University Jena, Institute of Applied Physics, Jena, Germany
    Opt Express 19:8656-61. 2011
  7. doi request reprint Controlling mode instabilities by dynamic mode excitation with an acousto-optic deflector
    Hans Jürgen Otto
    Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller Universitat Jena, Albert Einstein Str 15, 07745 Jena, Germany
    Opt Express 21:17285-98. 2013
  8. doi request reprint Experimental observations of the threshold-like onset of mode instabilities in high power fiber amplifiers
    Tino Eidam
    Friedrich Schiller University Jena, Institute of Applied Physics, Jena, Germany
    Opt Express 19:13218-24. 2011
  9. doi request reprint Physical origin of mode instabilities in high-power fiber laser systems
    Cesar 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
  10. doi request reprint Temporal dynamics of mode instabilities in high-power fiber lasers and amplifiers
    Hans 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

Collaborators

Detail Information

Publications21

  1. ncbi request reprint Thermally induced waveguide changes in active fibers
    Florian 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...
  2. doi request reprint Modeling the inhibition of stimulated Raman scattering in passive and active fibers by lumped spectral filters in high power fiber laser systems
    Florian 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...
  3. doi request reprint The influence of index-depressions in core-pumped Yb-doped large pitch fibers
    Florian 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...
  4. doi request reprint Avoided crossings in photonic crystal fibers
    Florian 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...
  5. doi request reprint Temperature-induced index gratings and their impact on mode instabilities in high-power fiber laser systems
    Cesar 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...
  6. doi request reprint Preferential gain photonic-crystal fiber for mode stabilization at high average powers
    Tino 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...
  7. doi request reprint Controlling mode instabilities by dynamic mode excitation with an acousto-optic deflector
    Hans Jürgen Otto
    Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller Universitat Jena, Albert Einstein Str 15, 07745 Jena, Germany
    Opt Express 21:17285-98. 2013
    ..The physical working principle is discussed at the light of the recently published theoretical explanations of mode instabilities. ..
  8. doi request reprint Experimental observations of the threshold-like onset of mode instabilities in high power fiber amplifiers
    Tino 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...
  9. doi request reprint Physical origin of mode instabilities in high-power fiber laser systems
    Cesar 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...
  10. doi request reprint Temporal dynamics of mode instabilities in high-power fiber lasers and amplifiers
    Hans 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...
  11. doi request reprint Non-hexagonal Large-Pitch Fibers for enhanced mode discrimination
    Fabian 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...
  12. doi request reprint 135 W average-power femtosecond pulses at 520 nm from a frequency-doubled fiber laser system
    Jan 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...
  13. doi request reprint Passive mitigation strategies for mode instabilities in high-power fiber laser systems
    Cesar Jauregui
    Friedrich Schiller Universitat Jena, Institute of Applied Physics, Abbe Center of Photonics, Albert Einstein Str 15, 07745 Jena, Germany
    Opt Express 21:19375-86. 2013
    ..Furthermore, we propose two passive mitigation strategies, one intrinsic and one extrinsic, that should lead to a significant increase of the power threshold of mode instabilities. ..
  14. doi request reprint High-power thermally guiding index-antiguiding-core fibers
    Florian Jansen
    Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller Universitat Jena, Albert Einstein Strasse 15, Jena 07745, Germany
    Opt Lett 38:510-2. 2013
    ..Experimentally, regimes of antiguidance, single-mode operation, and mode instabilities predominantly with radially symmetric higher-order modes are observed. Fundamental limitations for conventional VLMA step-index fibers are discussed...
  15. ncbi request reprint 26 mJ, 130 W Q-switched fiber-laser system with near-diffraction-limited beam quality
    Fabian 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...
  16. doi request reprint High average power large-pitch fiber amplifier with robust single-mode operation
    Fabian 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...
  17. doi request reprint High average and peak power femtosecond large-pitch photonic-crystal-fiber laser
    Martin 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...
  18. doi request reprint High-speed modal decomposition of mode instabilities in high-power fiber lasers
    Fabian 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...
  19. doi request reprint 2.4 mJ, 33 W Q-switched Tm-doped fiber laser with near diffraction-limited beam quality
    Fabian Stutzki
    Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller Universitat Jena, Jena, Germany
    Opt Lett 38:97-9. 2013
    ..9 kHz) and nearly diffraction-limited beam quality. This record performance is enabled by a Tm-doped large-pitch fiber, which allows for large core diameters in combination with effective single-mode operation...
  20. doi request reprint High-power very large mode-area thulium-doped fiber laser
    Florian 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...
  21. doi request reprint Fiber chirped-pulse amplification system emitting 3.8 GW peak power
    Tino 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...