Several journals
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Several journals
Image: Ira Winkler, IAP (University Jena)

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Highlighted authors are members of the University of Jena.

  2. Polarization-maintaining, rod-type, ytterbium-doped, multi-core fiber for high power operation

    Year of publicationStatusReview pendingPublished in:Optics Express Y. Khalil, C. Jauregui, A. Klenke, M. Bahri, J. Nold, N. Haarlammert, T. Schreiber, J. Limpert
    It has been previously observed that each core in a multi-core fiber has its own birefringence properties. Therefore, obtaining a laser output with a well-defined polarization pattern from a multi-core fiber is challenging. In this work, we explain the origin of this core-dependent birefringence and present a polarization-maintaining, 35-core fiber design that is tested in an oscillator setup, delivering over 100W of power with a polarization contrast ratio close to 10dB. This is a significant improvement with respect to a comparable non-polarization-maintaining multi-core fiber.
    University Bibliography Jena:
    fsu_mods_00030211External link

  3. 117-mJ pulse energy, high average power, Q-switched Yb-doped 49-core fiber amplifier

    Year of publicationStatusReview pendingPublished in:Optics Express M. Bahri, C. Jauregui, A. Klenke, M. Lenski, J. Nold, N. Haarlammert, T. Schreiber, J. Limpert
    This work presents the simultaneous scaling of the average power and pulse energy emitted by multicore fiber laser systems. This is achieved through two series of experiments that use a generation of Yb-doped multicore fiber amplifiers with 49 cores, seeded by a Q-switched multicore fiber laser. One of the main results of these experiments is a total pulse energy of up to 117 mJ at a repetition rate of 5 kHz in quasi-continuous pumping operation. In a different experiment with a smaller core size multicore fiber, an average power of 400 W was achieved at a repetition rate of 5 kHz, corresponding to a pulse energy of 80 mJ in continuous pumping. The experimental results match our simulation predictions, providing valuable insights into the further energy scalability of Yb-doped multicore fibers.
    University Bibliography Jena:
    fsu_mods_00030210External link

  6. Broadband Bright Biphotons From Periodically Poled Brillouin Zone Folding Metasurface

    Year of publicationPublished in:Laser and Photonics Reviews J. Zhang, C. Shi, J. Ma, F. Setzpfandt, T. Pertsch, C. Bao, J. Zhang, A. Sukhorukov
    University Bibliography Jena:
    fsu_mods_00029702External link

  7. Inverse microparticle design for enhanced optical trapping and detection efficiency in all six degrees of freedom

    Year of publicationStatusReview pendingPublished in:JPhys Photonics M. Lee, B. Stickler, T. Pertsch, S. Hong
    Achieving quantum-limited motional control of optically trapped particles beyond the sub-micrometer scale is an outstanding problem in levitated optomechanics. A key obstacle is solving the light scattering problem and identifying particle geometries that allow stable trapping and efficient motional detection of their center of mass and rotational motion in three dimensions. Here, we present a computational framework that combines an efficient electromagnetic scattering solver with the adjoint method to inversely design printable microparticles tailored for levitated optomechanics. Our method allows identifying optimized geometries, characterized by enhanced optical trapping and detection efficiencies compared to conventional microspheres. This improves the feasibility of quantum-limited motional control of all translational and rotational degrees of freedom in a standard standing-wave optical trap.
    University Bibliography Jena:
    fsu_mods_00030334External link

  8. Bridging Classical and Quantum Approaches for Quantitative Sensing of Turbid Media with Polarization-Entangled Photons

    Year of publicationPublished in:Laser and Photonics Reviews V. Besaga, I. Lopushenko, O. Sieryi, A. Bykov, F. Setzpfandt, I. Meglinski
    Polarimetry with quantum light promises improved measurements for various scenarios. However, fundamental understanding of quantum photonic state transport in complex, real media, and tools to interpret the state after interaction with the sample are still lacking. Here, we theoretically and experimentally explore the evolution of polarization-entangled states in a turbid medium on example of tissue phantoms. By elaborating mathematical relationship between Wolf's coherency matrix and density matrix, we introduce a versatile framework describing the transfer of entangled photons in turbid environments with polarization tracking and resulting quantum state representation with the density operator. Experimentally, we reveal a robust trend in the state evolution depending on the reduced scattering coefficient of the medium. Our theoretical predictions correlate with experimental findings, while the model extends the study by photonic states with different degrees of entanglement. The presented results pave the way for quantitative quantum photonic sensing enabling applications ranging from biomedical diagnostics to remote sensing.
    University Bibliography Jena:
    fsu_mods_00029724External link

  9. Thickness Dependence of Linear and Nonlinear Optical Properties of Multilayer 3R‐MoS 2

    Year of publicationStatusReview pendingPublished in:Advanced Optical Materials F. Abtahi, A. Shaji, G. Ngo, B. Laudert, H. Esfandiar, S. Schmitt, F. Eilenberger
    3R-MoS ₂ , a MoS ₂ polytype with broken inversion symmetry, enables unique light-matter interactions and is promising for linear and nonlinear integrated photonics beyond the monolayer limit. Yet, systematic studies of its thickness-dependent reflectivity and its impact on harmonic generation are still lacking. While AFM can offer atomic-scale resolution, measuring 3R-MoS ₂ on non-solid substrates like PDMS remains challenging. To address this, a fast, non-destructive optical method is introduced to determine the thickness of 3R-MoS ₂ flakes from reflectivity measurements with a mean bias of less than 2 nm in the 3–200 nm range. Nonlinear characterization further reveals distinct thickness-dependent maxima in second- and third-harmonic generation (SHG/THG), with the first clear peak at ≈200 nm. These maxima arise from Fabry–Pérot-type phase matching conditions mediated by the film thickness and can further be shaped by absorption. This work thus provides both a practical thickness metrology and new insights for exploiting thickness-dependent 3R-MoS ₂ nonlinearities in scalable photonic technologies.
    University Bibliography Jena:
    fsu_mods_00030234External link

  11. Soft X-ray imaging with coherence tomography in the water window spectral range using high-harmonic generation

    Year of publicationPublished in:Light: Science and Applications J. Reinhard, F. Wiesner, M. Hennecke, T. Sidiropoulos, S. Kaleta, J. Späthe, J. Abel, M. Wünsche, G. Schmidl, J. Plentz, U. Hübner, K. Freiberg, J. Apell, S. Lippmann, M. Schnürer, S. Eisebitt, G. Paulus, S. Fuchs
    High-harmonic generation (HHG) is used as a source for various imaging applications in the extreme ultraviolet spectral range. It offers spatially coherent radiation and unique elemental contrast with the potential for attosecond time resolution. The unfavorable efficiency scaling to higher photon energies prevented the imaging application in the soft X-ray range so far. In this work we demonstrate the feasibility of using harmonics for imaging in the water window spectral region (284 eV to 532 eV). We achieve nondestructive depth profile imaging in a heterostructure by utilizing a broadband and noise-resistant technique called soft X-ray Coherence Tomography (SXCT) at a high-flux lab-scale HHG source. SXCT is derived from Optical Coherence Tomography, a Fourier based technique that can use the full bandwidth of the source to reach an axial resolution of 12 nm in this demonstration. The employed source covers the entire water window, with a photon flux exceeding 10 ⁶ photons/eV/s at a photon energy of 500 eV. We show local cross sections of a sample consisting of Aluminium oxide and Platinum layers of varying thickness on a Zinc oxide substrate. We validate the findings with scanning and transmission electron microscopy after preparation with focused ion beam milling.
    University Bibliography Jena:
    fsu_mods_00030098External link

  12. Adaptive LED illumination with maskless irregular lenslet arrays and controlled crosstalk

    Year of publicationPublished in:Journal of optical microsystems D. Stefanidi, L. Wilhelm, P. Schreiber, P. Schleicher, S. Kleinle, R. Rosenberger, F. Kraze, R. Brüning, A. Tünnermann
    University Bibliography Jena:
    fsu_mods_00026124External link
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