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@TECHREPORT{Heyl:619673,
      author       = {Heyl, Christoph and Lang, Tino and Seidel, Marcus},
      title        = {{L}aser pulse spectral broadening apparatus, laser source
                      apparatus and method of creating laser pulses},
      reportid     = {PUBDB-2024-07812},
      year         = {2024},
      abstract     = {A laser pulse spectral broadening apparatus (100) for
                      spectral broadening of laser pulses (1A) comprises a
                      multi-pass cell device (10) with multiple mirror elements,
                      which are arranged for providing a beam path (2) extending
                      from an input section to an output section of the multi-pass
                      cell device (10), wherein the mirror elements comprise
                      focussing mirror elements having a concave curvature, and
                      with a pulse spectral broadening device (20) including at
                      least one optical non-linear medium (21) being arranged in
                      the beam path (2) for spectral broadening of the laser
                      pulses passing the pulse spectral broadening device (20),
                      wherein the mirror elements have a configuration providing
                      multiple passages of the beam path (2) through the pulse
                      spectral broadening device (20), wherein the mirror elements
                      further comprise folding mirror elements having a close to
                      plane shape, wherein the absolute value of the radius of
                      curvature of the folding mirror elements (11, 12) is larger
                      than 10 m, the folding mirror elements span a folded
                      collimation portion (3) of the beam path (2) and the beam
                      path (2) has a degree of collimation along the whole
                      collimation portion (3), such that an accumulated
                      collimation portion Gouy phase parameter Gcol in the
                      collimation portion (3) is π/15<Gcol<π//2, and the mirror
                      elements are arranged such that an accumulated half round
                      trip Gouy phase parameter Ghrt per half round trip through
                      the multi-pass cell device (10) differs from n*π//2, with n
                      being a natural number. Furthermore, a laser source
                      apparatus and a method of creating laser pulses (1B),
                      employing the laser pulse spectral broadening apparatus
                      (100), are described.},
      cin          = {FS-LA / FS-PRI},
      cid          = {I:(DE-H253)FS-LA-20130416 / I:(DE-H253)FS-PRI-20240109},
      pnm          = {631 - Matter – Dynamics, Mechanisms and Control
                      (POF4-631)},
      pid          = {G:(DE-HGF)POF4-631},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101 /
                      EXP:(DE-H253)F-FELdiag-20171201},
      typ          = {PUB:(DE-HGF)23},
      url          = {https://bib-pubdb1.desy.de/record/619673},
}