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@INPROCEEDINGS{Hlsenbusch:453471,
      author       = {Hülsenbusch, T. and Eichner, Timo and Lang, T. and
                      Winkelmann, L. and Hartl, I. and Maier, Andreas},
      title        = {{E}xperimental {R}esults on an {OPCPA} {S}eed {S}ystem for
                      a {L}aser-{P}lasma {A}cceleration {D}rive {L}aser},
      reportid     = {PUBDB-2020-05272},
      year         = {2019},
      abstract     = {Laser-plasma acceleration[1], among others[2,3],promises to
                      be a powerful technology for driving future compact light
                      sources. LUX, which is operated by University of Hamburg,is
                      such a laser-plasma accelerator. It is driven by the 200 TW
                      Ti:Sapphire double chirped pulse amplification (CPA)laser
                      system ANGUS, designed for long-term stability.The laser, as
                      well as the electron beam line,are integrated in a control
                      system, enabling continuous operation for many hours. This
                      has been demonstrated with day-long measurement runs where
                      electron beams with energies above 600 MeV and spontaneous
                      undulator radiation well below 9 nm were achieved [4]. From
                      the long runs large data sets can be collected to provide
                      reliable statistics. To extend the long-term operation
                      abilities of the laser system, and therefore the runtime of
                      the measurement campaigns, we are currently developing a new
                      front end for the ANGUS laser system.With the design
                      approach of the ANGUS laser system in mind we focus on the
                      long-term stability in the development of the new front-end.
                      The target is to reach 35 μJ pulse energy with 20 fs
                      transform limit at 1 kHz close to 800 nm central wavelength.
                      For these parameters and application optical parametric
                      chirped pulse amplification (OPCPA) is a suitable candidate.
                      It has been demonstrated that such systems can be operated
                      for more than a week with stable generation of high contrast
                      ultrafast pulses reaching down to the few cycle regime [5].A
                      measure to get to long-term stability is to use an
                      industrial grade Yb:KGW femto second laser as a common
                      source for white light generation(WLG)and pump for the
                      subsequent OPCPA stages. As only a fraction of the pulse
                      energy emitted by the drive laser is needed for WLG in a
                      bulk YAG crystal to provide the seed, complicated
                      synchronization schemes between two lasers can be
                      avoided.The major part of the pulse energy is converted in a
                      second harmonic generation (SHG)stage to be used as a pump
                      for the OPCPA stages. With headroom to spare the SHG stages
                      can be optimized for stable operation instead of maximum
                      conversion efficiency.Furthermore, without the necessity to
                      reach the few cycle regime, the OPCPA stages can be designed
                      for pulse energy stability instead of maximum amplification
                      bandwidth. Also the fact that no additional laser amplifier
                      stages are needed in the pump arm allows for a compact setup
                      that should be less sensitive on environmental influences.
                      Our approach is unique in the sense, that we focus on
                      maximum stability in parameters, rather than optimizing the
                      setup for minimum pulse lengths or efficiency.Currently we
                      are optimizing the SHG and the OPCPA stages for the
                      stability goals with a 3D+1 split step code.In parallel we
                      are setting up the first prototype OPCPA stage.We will
                      report on simulation as well as experimental results
                      regarding the SHG pump and the firstOPCPA stage with focus
                      on the achievable stability in pulse energy and spectral
                      parameters.[1] W.P. Leemanns et al. “GeV electron beams
                      from a centimetre-scale accelerator”, in Nature Physics 2,
                      696–699 (2006)[2] A-L. Calendron et al. “Laser system
                      design for table-top X-ray light source”,in High Power
                      Laser Science and Engineering 6: e12 (2018)[3] E. A. Peralta
                      et al.“Demonstration of Electron Acceleration in a
                      Laser-Driven Dielectric Micro-Structure”,Nature 503, 7474
                      (2013)[4] N. Delbos et al."LUX --A Laser-Plasma Driven
                      Undulator Beamline", Nucl. Instr. Meth. Phys. Res. A 909,
                      318 (2018)[5]R. Budriūnas et al."53 W average power
                      CEP-stabilized OPCPA system delivering 5.5 TW few cycle
                      pulses at 1 kHz repetition rate”, Opt. Express 25,
                      5797-5806 (2017)},
      month         = {Sep},
      date          = {2019-09-29},
      organization  = {Advanced Solid State Lasers, Vienna
                       (Austria), 29 Sep 2019 - 3 Oct 2019},
      cin          = {CFEL-LUX / FS-LA},
      cid          = {I:(DE-H253)CFEL-LUX-20160909 / I:(DE-H253)FS-LA-20130416},
      pnm          = {631 - Accelerator R $\&$ D (POF3-631)},
      pid          = {G:(DE-HGF)POF3-631},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)24},
      url          = {https://bib-pubdb1.desy.de/record/453471},
}