Cesar Jauregui

Summary

Affiliation: Friedrich Schiller University
Country: Germany

Publications

  1. doi 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
  2. doi 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
  3. doi 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
  4. doi Widely tuneable fiber optical parametric amplifier for coherent anti-Stokes Raman scattering microscopy
    Mario Chemnitz
    Institute for Applied Physics, Abbe Center of Photonics, Friedrich Schiller Universtity Jena, Jena, Germany
    Opt Express 20:26583-95. 2012
  5. doi 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
  6. doi 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
  7. doi 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
  8. doi 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 Avoided crossings in photonic crystal fibers
    Florian Jansen
    Institute of Applied Physics, Friedrich Schiller Universitat Jena, Jena, Germany
    Opt Express 19:13578-89. 2011
  10. doi Fiber-based source for multiplex-CARS microscopy based on degenerate four-wave mixing
    Thomas Gottschall
    Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller Universitat Jena, Max Wien Platz 1, 07743 Jena, Germany
    Opt Express 20:12004-13. 2012

Collaborators

Detail Information

Publications28

  1. doi 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. ..
  2. doi 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...
  3. doi 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...
  4. doi Widely tuneable fiber optical parametric amplifier for coherent anti-Stokes Raman scattering microscopy
    Mario Chemnitz
    Institute for Applied Physics, Abbe Center of Photonics, Friedrich Schiller Universtity Jena, Jena, Germany
    Opt Express 20:26583-95. 2012
    ..CARS spectroscopy and microscopy is demonstrated, probing different molecular vibrational modes within the accessible region between 1200cm(-1) and 3800cm(-1)...
  5. doi 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...
  6. doi 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. ..
  7. doi 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...
  8. doi 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 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...
  10. doi Fiber-based source for multiplex-CARS microscopy based on degenerate four-wave mixing
    Thomas Gottschall
    Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller Universitat Jena, Max Wien Platz 1, 07743 Jena, Germany
    Opt Express 20:12004-13. 2012
    ..This work marks a significant step towards a simple and powerful all-fiber, maintenance-free multiplex-CARS source for real-world applications outside a laboratory environment...
  11. doi 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...
  12. ncbi 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...
  13. doi Fiber based polarization filter for radially and azimuthally polarized light
    Christoph Jocher
    Friedrich Schiller Universitat Jena, Institute of Applied Physics, Albert Einstein Str 15, 07745 Jena, Germany
    Opt Express 19:19582-90. 2011
    ..As a proof of principle, we filter azimuthally polarized light in a commercially available fiber in which a fiber Bragg grating has been written by a femtosecond pulsed laser...
  14. doi 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...
  15. doi 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...
  16. doi 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...
  17. doi 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...
  18. doi 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...
  19. ncbi 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...
  20. doi 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...
  21. doi 58 mJ burst comprising ultrashort pulses with homogenous energy level from an Yb-doped fiber amplifier
    Sven Breitkopf
    Abbe Center of Photonics, Friedrich Schiller Universitat Jena, Albert Einstein Strasse 15, Jena 07745, Germany
    Opt Lett 37:5169-71. 2012
    ..This causes a very homogenous energy distribution during the burst. The output burst has a repetition frequency of 20 Hz, is 200 μs long and, therefore, contains 2000 pulses at a pulse repetition rate of 10 MHz...
  22. doi 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...
  23. doi 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...
  24. doi High-power efficient generation of visible and mid-infrared radiation exploiting four-wave-mixing in optical fibers
    Cesar Jauregui
    Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller Universitat Jena, Albert Einstein Str 15, 07745 Jena, Germany
    Opt Express 20:24957-65. 2012
    ..6 W of mid-IR radiation at 2570 nm were generated simultaneously with 14.4 W at 672 nm. These power levels of picosecond red radiation are among the highest reported so far for a diffraction limited beam quality in this wavelength region...
  25. doi The impact of modal interference on the beam quality of high-power fiber amplifiers
    Cesar Jauregui
    Friedrich Schiller University Jena, Institute of Applied Physics, Albert Einstein Strasse 15, D 07745, Jena, Germany
    Opt Express 19:3258-71. 2011
    ..According to the model presented in this paper, the most likely cause for the beam quality degradation is an inversion-induced grating created by the interplay between modal interference along the fiber and transversal hole burning...
  26. ncbi All-fiber laser source for CARS microscopy based on fiber optical parametric frequency conversion
    Martin Baumgartl
    Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller Universitat Jena, Albert Einstein Str 15, 07745 Jena, Germany
    Opt Express 20:4484-93. 2012
    ..Due to its simplicity and maintenance-free operation, the laser scheme holds great potential for bio-medical applications outside laser laboratories...
  27. ncbi Derivation of Raman treshold formulas for CW double-clad fiber amplifiers
    Cesar Jauregui
    Friedrich Schiller University Jena, Institute of Applied Physics, Jena, Germany
    Opt Express 17:8476-90. 2009
    ..Consequently new analytical formulas for the Raman threshold are obtained and their accuracy is tested. Using these new formulas, the dependence of the Raman threshold on various parameters is studied...
  28. doi 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...