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@ARTICLE{Schoenberg:517343,
      author       = {Schoenberg, Arthur and Salman, Haydar Sarper and Tajalli
                      Seifi, Ayhan and Kumar, Sonu and Hartl, Ingmar and Heyl,
                      Christoph},
      title        = {{B}elow-threshold harmonic generation in gasjets for
                      {T}h-229 nuclear spectroscopy},
      journal      = {Optics express},
      volume       = {31},
      number       = {8},
      issn         = {1094-4087},
      address      = {Washington, DC},
      publisher    = {Optica},
      reportid     = {PUBDB-2023-00396},
      pages        = {12880 - 12893},
      year         = {2023},
      abstract     = {The generation of below-threshold harmonics in gas-jets
                      constitutes a promising path towards optical frequency combs
                      in the vacuum ultra-violet (VUV) spectral range. Of
                      particular interest is the 150 nm range, which can be
                      exploited to probe the nuclear isomeric transition of the
                      Thorium-229 isotope. Using widely available high-power,
                      high-repetition-rate Ytterbium-based laser sources, VUV
                      frequency combs can be generated through the process of
                      below-threshold harmonic generation, in particular 7th
                      harmonic generation of 1030 nm. Knowledge about the
                      achievable efficiencies of the harmonic generation process
                      is crucial for the development of suitable VUV sources. In
                      this work, we measure the total output pulse energies and
                      conversion efficiencies of below-threshold harmonics in
                      gas-jets in a phase-mismatched generation scheme using Argon
                      and Krypton as nonlinear media. Using a 220 fs, 1030 nm
                      source, we reach a maximum conversion efficiency of
                      1.1 × 10−5 for the 7th harmonic (147 nm) and
                      0.78 × 10−4 for the 5th harmonic (206 nm). In
                      addition, we characterize the 3rd harmonic of a 178 fs,
                      515 nm source with a maximum efficiency of $0.3\%.$},
      cin          = {FS-LA / HI Jena / GSI},
      ddc          = {530},
      cid          = {I:(DE-H253)FS-LA-20130416 / $I:(DE-H253)HI_Jena-20120814$ /
                      I:(DE-H253)GSI-20200423},
      pnm          = {631 - Matter – Dynamics, Mechanisms and Control
                      (POF4-631)},
      pid          = {G:(DE-HGF)POF4-631},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {37157438},
      UT           = {WOS:000975304700003},
      doi          = {10.1364/OE.486338},
      url          = {https://bib-pubdb1.desy.de/record/517343},
}