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@INPROCEEDINGS{Rentschler:607055,
      author       = {Rentschler, Christian and Matlis, Nicholas and Demirbas,
                      Umit and Zhang, Zhelin and Pergament, Mikhail and Zukauskas,
                      Andrius and Canalias, Carlota and Ishizuki, Hideki and
                      Pasiskevicius, Valdas and Laurell, Fredrik and Taira,
                      Takunori and Kärtner, Franz},
      editor       = {Schunemann, Peter G.},
      title        = {{P}arameter dependencies in multicycle {TH}z generation
                      with tunable high-energy pulse trains in large-aperture
                      crystals},
      journal      = {Proceedings of SPIE},
      volume       = {12869},
      issn         = {0038-7355},
      address      = {Bellingham, Wash.},
      publisher    = {SPIE},
      reportid     = {PUBDB-2024-01754},
      isbn         = {9781510669987},
      pages        = {44},
      year         = {2024},
      comment      = {Nonlinear Frequency Generation and Conversion: Materials
                      and Devices XXIII},
      booktitle     = {Nonlinear Frequency Generation and
                       Conversion: Materials and Devices
                       XXIII},
      abstract     = {Efficiencies of nonlinear optical-to-terahertz (THz)
                      conversion below one percent remain a limiting factor for
                      applications of multicycle THz radiation like THz-driven
                      acceleration and inspired the use of multi-line pump
                      spectra. To overcome the difficulty of phase stabilization
                      of multiple narrowband sources required by the multi-line
                      approach, we exploit its temporal analog, i.e., regular
                      pulse trains with THz repetition rate, in which the THz
                      waves generated by rectifying the individual pulses add
                      coherently. The optical setup producing the pulse trains
                      consists of motorized interferometers and enables precise
                      control over the pulse train parameters like pulse spacing
                      and amplitude. It is operated with a laser providing 400 fs
                      pulses and energies of up to 110 mJ, which is the highest
                      yet attempted for a pulse-train-type experiment. Opposed to
                      earlier work, pulse division is done after amplification
                      making the system more flexible in terms of tuning the pulse
                      number. We present initial results of an experimental
                      campaign of multicycle THz generation in custom periodically
                      poled crystals with large apertures up to 10x20 mm2. The
                      available pump energy allows filling these apertures at high
                      fluences, promising increased THz yields. We investigate the
                      dependence of the conversion efficiency on the single pulse
                      duration and aim to find the optimum pulse number for
                      different crystal lengths to determine the efficiency
                      limitations in a regime avoiding laser-induced damage. Since
                      crystal length and pulse number define the bandwidth of the
                      THz pulses, this work demonstrates a path to an optimized
                      THz source tunable to different requirements of
                      applications.},
      month         = {Jan},
      date          = {2024-01-29},
      organization  = {SPIE Photonics West LASE, San
                       Francisco (United States), 29 Jan 2024
                       - 31 Jan 2024},
      cin          = {FS-CFEL-2},
      ddc          = {620},
      cid          = {I:(DE-H253)FS-CFEL-2-20120731},
      pnm          = {631 - Matter – Dynamics, Mechanisms and Control
                      (POF4-631) / AXSIS - Frontiers in Attosecond X-ray Science:
                      Imaging and Spectroscopy (609920)},
      pid          = {G:(DE-HGF)POF4-631 / G:(EU-Grant)609920},
      experiment   = {EXP:(DE-H253)AXSIS-20200101},
      typ          = {PUB:(DE-HGF)16 / PUB:(DE-HGF)8 / PUB:(DE-HGF)7},
      doi          = {10.1117/12.3003195},
      url          = {https://bib-pubdb1.desy.de/record/607055},
}