Publications

of the reseach group

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Highlighted authors are members of the University of Jena.

  2. Recent developments in the understanding and passive mitigation of transverse mode instability

    Year of publicationStatusReview pendingPublished in:Optical fiber technology : materials, devices and systems C. Jauregui, Y. Tu, S. Kholaif, F. Möller, G. Palma-Vega, N. Haarlammert, T. Walbaum, T. Schreiber, J. Limpert
    In this article we look at the newest developments in the understanding and mitigation of TMI in single-core fibers. This includes recent quantitative measurements that reveal the dependence of the TMI threshold on the modal content of the seed, systematic measurements on the dependence of the TMI threshold on the fiber core size, as well as the study of TMI in PM fibers including a novel passive mitigation strategy and the static modal energy transfer recently observed in these fibers.
    University Bibliography Jena:
    fsu_mods_00029154External link

  5. Precision manufacturing of multicore fibers for superior fiber laser performance

    Year of publicationPublished in:Fiber Lasers XXII: Technology and Systems N. Haarlammert, J. Nold, S. Kuhn, C. Jauregui, J. Limpert, T. Schreiber
    University Bibliography Jena:
    fsu_mods_00024763External link

  6. Pulse energy scaling of ultrafast lasers via spectral-temporal shaping and coherent combination

    Year of publication L. Stark
    University Bibliography Jena:
    fsu_mods_00019662External link

  9. Influence of core size on the transverse mode instability threshold of fiber amplifiers

    Year of publicationPublished in:Optics Express S. Kholaif, C. Jauregui, J. Nold, N. Haarlammert, S. Kuhn, T. Schreiber, J. Limpert
    We present what we believe to be the first systematic experimental study investigating the impact of core size on transverse mode instability. This is a very complex measurement that requires a significant amount of attention to detail. For example, this study can only be done using fibers which modal characteristics do not change with the core size, a property offered by Ytterbium-doped large-pitch fibers. Additionally, it is mandatory to consider the influence of gain saturation and photodarkening to isolate the impact of the core size on the transverse mode instability threshold. The findings of the measurements reveal that the dependence of this threshold with the core size is weaker than predicted by some theoretical models. Additionally, during the course of these measurements, a mode instability threshold over 600 W was achieved in one of the fibers, which represents the highest, diffraction-limited, average output power reported from an Ytterbium-doped, rod-type fiber so far.
    University Bibliography Jena:
    fsu_mods_00029704External link

  10. Multiplexing information limits in multi-beam ptychography

    Year of publicationPublished in:Optics Express D. Penagos Molina, W. Eschen, C. Liu, J. Limpert, J. Rothhardt
    Ptychography is a lensless imaging technique where the sample is laterally scanned by the illuminating beam. In multi-beam ptychography multiple beams simultaneously illuminate the sample, enabling faster scanning of larger areas. In this work, we explore the potential of multi-beam ptychography with a large number of illumination channels to enhance imaging throughput. Our findings show that while spatial resolution is reduced compared to single-beam ptychography, multi-beam ptychography still significantly increases throughput. Using synthetic and experimental data, we demonstrate an almost fivefold improvement in throughput, accompanied by reduced memory footprint and overhead time. Furthermore, we present the successful implementation of massively multiplexed multi-beam ptychography with up to 64 channels. These results pave the way for efficient use of light sources with partial spatial or temporal coherence for ptychography, opening new possibilities for high-throughput imaging applications.
    University Bibliography Jena:
    fsu_mods_00023309External link

  11. 18-mJ pulse energy, 27-W average power, second harmonic generation in a Q-switched 49-core Yb-doped fiber laser

    Year of publicationPublished in:Fiber Lasers XXII: Technology and Systems M. Bahri, A. Klenke, C. Jauregui, J. Nold, N. Haarlammert, T. Schreiber, J. Limpert
    University Bibliography Jena:
    fsu_mods_00024762External link

  12. Femtosecond CPA laser system emitting 261W average power, 1.75mJ pulse energy based on coherent combination of a 49-core fiber

    Year of publicationPublished in:Fiber Lasers XXII: Technology and Systems A. Klenke, M. Bahri, C. Jauregui, J. Nold, N. Haarlammert, T. Schreiber, J. Limpert
    University Bibliography Jena:
    fsu_mods_00024765External link
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