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@PHDTHESIS{Zobus:347777,
      author       = {Zobus, Yannik},
      title        = {{D}esign and {I}mplementation of a {H}igh-{C}ontrast,
                      {M}illijoule-{L}evel {U}ltrafast {O}ptical {P}arametric
                      {A}mplifier for {H}igh-{I}ntensity {L}asers},
      school       = {Technical University of Darmstadt},
      type         = {Dissertation},
      reportid     = {GSI-2023-01111},
      pages        = {134},
      year         = {2023},
      note         = {This work is licensed under a Creative Commons License:
                      Attribution–ShareAlike 4.0 International
                      https://creativecommons.org/licenses/by-sa/4.0/;
                      Dissertation, Technical University of Darmstadt, 2023},
      abstract     = {The objective of this work was the development of a laser
                      module to improve the temporal contrast of high-intensity
                      laser systems and its implementation at the high-power laser
                      PHELIX at the GSI Helmholtzzentrum für Schwerionenforschung
                      GmbH in Darmstadt. By improving the temporal contrast,
                      experiments with laser-plasma interaction under extreme peak
                      intensities should be made possible without disturbing or
                      destroying the target before the arrival of the main pulse.
                      In the frame of this work, I have therefore developed an
                      ultrafast optical parametric amplifier (uOPA), which enables
                      high-temporal-contrast amplification of short laser pulses
                      up to the millijoule range and can thus replace subsequent
                      contrast-degrading amplifier systems. In addition to
                      reducing amplified spontaneous emission, the occurrence of
                      pre-pulses can also be prevented. I have additionally
                      developed a dedicated pump module for this amplifier, which
                      can be used in a wide spectral range around the central
                      wavelength of 1 μm and thereby can be implemented on
                      various laser systems as a pump laser for uOPA systems.
                      Thus, in addition to the high-contrast amplifier for the
                      Nd:glass laser system PHELIX, I have built a second uOPA
                      module for use in the diode-pumped Yb:CaF2 laser system
                      PENELOPE. I implemented the module on the high-power PHELIX
                      laser as part of this work, which successfully replaced an
                      amplifier, which generated intense pre-pulses, in the
                      amplification chain. This allowed me to lower the pre-pulse
                      contrast at PHELIX by nearly three orders of magnitude to a
                      contrast level of 6.2·10⁻¹¹, keeping the pre-pulse
                      intensity, even for the highest possible intensity at
                      PHELIX, below 100 GW/cm².},
      cin          = {PPH},
      cid          = {I:(DE-Ds200)PPH-20051214OR027},
      pnm          = {621 - Accelerator Research and Development (POF4-621)},
      pid          = {G:(DE-HGF)POF4-621},
      experiment   = {EXP:(DE-Ds200)P190-20200803 /
                      EXP:(DE-Ds200)P-21-00005-20221208},
      typ          = {PUB:(DE-HGF)11},
      urn          = {urn:nbn:de:tuda-tuprints-242000},
      doi          = {10.26083/TUPRINTS-00024200},
      url          = {https://repository.gsi.de/record/347777},
}