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@MASTERSTHESIS{Edelmann:479755,
      author       = {Edelmann, Marvin},
      othercontributors = {Wollenhaupt, Matthias and Kärtner, Franz},
      title        = {{D}evelopment of {N}onlinear and {U}ltra-low {N}oise
                      {F}iber {T}echnologies},
      school       = {University of Oldenburg/HS Emden Leer},
      type         = {Masterarbeit},
      reportid     = {PUBDB-2022-03202},
      pages        = {67},
      year         = {2022},
      note         = {Masterarbeit, University of Oldenburg/HS Emden Leer, 2021},
      abstract     = {Fiber-optic technologies for the generation of ultra-low
                      noise optical pulse trains have asevere impact on a great
                      variety of scientific fields and industrial applications
                      such asfrequency metrology, synchronization and timing in
                      free-electron laser facilities and particle accelerators,
                      photonic microwave generation and quantum technologies. The
                      fasttechnological progression of these applications
                      necessitates a constant improvement ofthe underlaying
                      fiber-optic laser systems in every aspect. The scope of this
                      thesis is thedevelopment of novel fiber-optic devices and
                      the discovery of new physical possibilitiesto overcome the
                      currently existing boundaries of ultrafast fiber lasers and
                      their ultra-lownoise applications.To this end, an
                      experimental and theoretical study of state-of-the-art fiber
                      oscillator modelocked with nonlinear amplifying loop mirrors
                      is conducted, a cavity structure thatdemonstrated record
                      ultra-low noise characteristics in conjunction with superior
                      environmental stability. A theoretical model is derived that
                      describes the interaction of the steadystate fluctuating
                      intracavity amplitude with the nonlinear dynamics of the
                      saturable absorber based on amplitude-noise transfer
                      coefficients. To experimentally investigate theinfluence of
                      this interaction decoupled from the optical feedback of the
                      cavity, a novelnonlinear fiber amplifier is constructed
                      which precisely replicates the physical mechanisms of an
                      isolated roundtrip in the oscillator for an auxiliary input
                      generated pulse train.The combined results of the
                      theoretical investigation and the systematic
                      measurementsreveal the existence of an intrinsic
                      amplitude-noise suppressing mechanism that acts onthe
                      circulating intracavity field once per roundtrip. The
                      discovery of this mechanism givesan explanation for the
                      superior noise performance of NALM mode-locked lasers for
                      thefirst time.The second part of this thesis is aimed at the
                      construction and optimization of a devicethat utilizes the
                      discovered nonlinear mechanism for quantum-limited noise
                      suppression.The implementation of an artificial sinusoidal
                      transmission-function in a phase-biased,self-stabilized
                      Sagnac interferometer with all-fiber integrated amplifier
                      enables highlyefficient and broadband suppression of the
                      input amplitude-fluctuations. In the experiment,
                      quantum-limited amplitude-noise suppression by up to 20 dB
                      down to the shotnoise limit at -151.1 dBc/Hz is demonstrated
                      for the frequency range >100 kHz with asimultaneous signal
                      amplification of 13.5 dB. The system shows an extraordinary
                      efficiency in conjunction with a high degree of tunability
                      based on the phase-bias settings.VHence, a great potential
                      for a variety of high-end applications is revealed such as
                      lownoise microwave generation and frequency metrology
                      together with the possibility for thegeneration of squeezed
                      quantum states of light under the right conditions.The third
                      part of this thesis is aimed at the development of a novel
                      I-shaped fiber oscillatormode-locked with the optical
                      Kerr-effect that uses coherent pulse division and
                      recombination to reduce the roundtrip nonlinear phase shift
                      and dramatically increase the achievable intracavity pulse
                      energy by 6.5 dB. In addition, a substantial improvement of
                      thenoise performance is verified for increasing pulse
                      divisions with a suppression of the output
                      amplitude-fluctuations by up to 9 dB for three divisions in
                      the frequency range from10 kHz to 2 MHz. In combination with
                      other established mechanisms to reduce the roundtrip
                      nonlinear phase shift based on dispersion-management or
                      scaling of the fiber coresize, the here developed divided
                      pulse oscillator enables a promising approach for nextgen
                      ultra-low noise and environmentally stable fiber oscillators
                      with high intracavitypower.},
      cin          = {FS-CFEL-2},
      cid          = {I:(DE-H253)FS-CFEL-2-20120731},
      pnm          = {631 - Matter – Dynamics, Mechanisms and Control
                      (POF4-631)},
      pid          = {G:(DE-HGF)POF4-631},
      experiment   = {EXP:(DE-H253)CFEL-Exp-20150101},
      typ          = {PUB:(DE-HGF)19},
      doi          = {10.3204/PUBDB-2022-03202},
      url          = {https://bib-pubdb1.desy.de/record/479755},
}