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@PHDTHESIS{Salman:349004,
      author       = {Salman, Haydar Sarper},
      title        = {{H}igh-power frequency combs for precision spectroscopy in
                      the extreme ultraviolet},
      school       = {Universität Hamburg},
      type         = {Dissertation},
      address      = {Hamburg},
      publisher    = {SUB Hamburg},
      reportid     = {GSI-2024-00465},
      pages        = {101 p.},
      year         = {2023},
      note         = {Dissertation, Universität Hamburg, 2023},
      abstract     = {Ultra-high-resolution spectroscopy provides the basis
                      behind multiple scientific fields and in particular, for
                      frequency metrology. The required techniques usually involve
                      optical frequency combs, which are well established in the
                      visible and infrared spectral regions. In contrast, the
                      Vacuum- and Extreme Ultraviolet (VUV and XUV) are barely
                      explored spectral ranges, mainly due to the lack of a
                      suitable light source. However, many atoms and in particular
                      ions of fundamental interest await to be analyzed.
                      Additionally, prospective nuclear clocks based on optically
                      driving the low energy 229Th nuclear transition (about 8.3
                      eV), set high demands on dedicated VUV sources. A possible
                      solution can be provided by high-power frequency combs
                      combined with cavity-enhanced high-harmonic generation
                      (HHG). However, this combination represents a highly complex
                      approach with great challenges if long-term stable,
                      low-noise operation is required. This is particularly
                      important should ultra-narrow transitions such as the 229Th
                      transition be targeted. This dissertation addresses these
                      challenges, describing the complete development of a
                      fully-stabilized high-power femtosecond frequency comb
                      centered at 1 μm wavelength with 65MHz comb line spacing
                      and more than 70W output power. Furthermore, important
                      features including a new oscillator design, wavelength
                      tuning, adaptation for remote computer control and a
                      technical interlock, which ensures fail-safe and stable
                      long-term operation of the system, are implemented. The
                      dissertation shows for the first time that a
                      fully-stabilized high-power frequency comb can be operated
                      continuously over multiple days without interruption,
                      setting the stage for VUV conversion and
                      ultra-high-resolution spectroscopy in this spectral region.},
      cin          = {JHL},
      cid          = {I:(DE-Ds200)JHL-20220701OR461},
      pnm          = {621 - Accelerator Research and Development (POF4-621)},
      pid          = {G:(DE-HGF)POF4-621},
      experiment   = {$EXP:(DE-Ds200)External_experiment-20200803$},
      typ          = {PUB:(DE-HGF)11},
      urn          = {	urn:nbn:de:gbv:18-ediss-118097},
      url          = {https://repository.gsi.de/record/349004},
}