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@ARTICLE{Fan:605790,
      author       = {Fan, Weichen and Ludwig, Markus and Rousseau, Ian and
                      Arabadzhiev, Ivo and Ruhnke, Bastian and Wildi, Thibault and
                      Herr, Tobias},
      title        = {{S}upercontinua from integrated gallium nitride waveguides},
      reportid     = {PUBDB-2024-01530, arXiv:2404.15712},
      year         = {2024},
      abstract     = {Supercontinua are broadband spectra that are essential to
                      optical spectroscopy, sensing, imaging, and metrology. They
                      are generated from ultrashort laser pulses through nonlinear
                      frequency conversion in fibers, bulk media and
                      chip-integrated waveguides. For any generating platform,
                      balancing the oppositional criteria of strong nonlinearity,
                      transparency, and absence of multiphoton absorption is a key
                      challenge.Here, we explore supercontinuum generation in
                      integrated gallium nitride (GaN) waveguides, which combine a
                      high Kerr-nonlinearity, mid-infrared transparency and a
                      large bandgap that prevents two- and three-photon absorption
                      in the technologically important telecom C-band where
                      compact erbium-based pump lasers exist. With such a laser,
                      we demonstrate tunable dispersive waves and gap-free spectra
                      extending to almost 4 µm in wavelength, relevant to
                      functional group chemical sensing.In addition, also
                      leveraging the material’s second-order nonlinearity, we
                      implement on-chip f-2f interferometry to detect the pump
                      laser's carrier-envelope offset frequency, which enables
                      precision metrology. These results demonstrate the
                      versatility of GaN-on-sapphire as a new platform for
                      broadband nonlinear photonics.},
      keywords     = {Optics (physics.optics) (Other) / FOS: Physical sciences
                      (Other)},
      cin          = {FS-CFEL-2-UMP},
      cid          = {I:(DE-H253)FS-CFEL-2-UMP-20201209},
      pnm          = {631 - Matter – Dynamics, Mechanisms and Control
                      (POF4-631) / STARCHIP - Microphotonics-based frequency combs
                      for habitable exoplanet detection (853564) / VH-NG-1404 -
                      Ultra-fast nonlinear microphotonics
                      $(G:(DE-HGF)2019_VH-NG-1404)$ / iSenseDNA - Computation
                      driven development of novel vivo-like-DNA-nanotransducers
                      for biomolecules structure identification (101046920)},
      pid          = {G:(DE-HGF)POF4-631 / G:(EU-Grant)853564 /
                      $G:(DE-HGF)2019_VH-NG-1404$ / G:(EU-Grant)101046920},
      experiment   = {EXP:(DE-H253)CFEL-Exp-20150101},
      typ          = {PUB:(DE-HGF)25},
      eprint       = {2404.15712},
      howpublished = {arXiv:2404.15712},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2404.15712;\%\%$},
      doi          = {10.48550/ARXIV.2404.15712},
      url          = {https://bib-pubdb1.desy.de/record/605790},
}