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@INPROCEEDINGS{Ruhnke:605327,
      author       = {Ruhnke, Bastian and Mahmoud, Gafaar and Wildi, Thibault and
                      Ludwig, Markus and Ulanov, Alexander and Voumard, Thibault
                      and Wang, Kai and Sinobad, Milan and Lorenzen, Jan and
                      Francis, Henry and Carreira, Jose and Singh, Neetesh Kumar
                      and Kärtner, Franz and Garcia-Blanco, Sonia M. and Herr,
                      Tobias},
      title        = {{I}ncreasing {K}err-comb efficiency through pump recycling
                      in a chip-integrated gain medium},
      school       = {Deutsches Elektronen Synchrotron DESY},
      reportid     = {PUBDB-2024-01414},
      year         = {2024},
      abstract     = {Continuous-wave (CW) laser-driven integrated Kerr
                      microresonators enable broadband optical frequency combs
                      with high repetition rates and low threshold power, in a
                      compact footprint. A drawback of such microcombs is the low
                      conversion efficiency from the pump laser to the comb lines,
                      which is often in the few percent range or below. Here,
                      complementing previously demonstrated approaches to increase
                      conversion efficiency, we demonstrate a novel approach that
                      leverages a chip-based rare-earth (Tm3+)-doped optical gain
                      medium to boost the pump-to-comb conversion efficiency by
                      more than one order of magnitude. Importantly, the gain
                      medium does not require an additional pump laser, but
                      recycles residual pump light from the Kerr-comb: the CW pump
                      of the Kerr-comb (1610 nm) coincides with the pump
                      wavelength of the on-chip gain medium, allowing unconverted
                      pump power to be absorbed and transferred to the comb lines
                      within gain window (1700 - 1900 nm). This enables a new
                      class of highly efficient Kerr-combs for applications e.g.
                      in data centers and optical computing.},
      month         = {Apr},
      date          = {2024-04-07},
      organization  = {SPIE Photonics Europe, Strasbourg
                       (France), 7 Apr 2024 - 11 Apr 2024},
      subtyp        = {Other},
      cin          = {FS-CFEL-2-UMP},
      cid          = {I:(DE-H253)FS-CFEL-2-UMP-20201209},
      pnm          = {899 - ohne Topic (POF4-899) / FEMTOCHIP - FEMTOSECOND LASER
                      ON A CHIP (965124) / STARCHIP - Microphotonics-based
                      frequency combs for habitable exoplanet detection (853564) /
                      VH-NG-1404 - Ultra-fast nonlinear microphotonics
                      $(G:(DE-HGF)2019_VH-NG-1404)$},
      pid          = {G:(DE-HGF)POF4-899 / G:(EU-Grant)965124 /
                      G:(EU-Grant)853564 / $G:(DE-HGF)2019_VH-NG-1404$},
      experiment   = {EXP:(DE-H253)CFEL-Exp-20150101},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://bib-pubdb1.desy.de/record/605327},
}