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@ARTICLE{Sanchez:316850,
      author       = {Sanchez, D. and Hemmer, M. and Baudisch, M. and Cousin, S.
                      L. and Zawilski, K. and Schunemann, P. and Chalus, O. and
                      Simon-Boisson, C. and Biegert, J.},
      title        = {7  $\mu$m, ultrafast, sub-millijoule-level mid-infrared
                      optical parametric chirped pulse amplifier pumped at
                      2 $\mu$m},
      journal      = {Optica},
      volume       = {3},
      number       = {2},
      issn         = {2334-2536},
      address      = {Washington, DC},
      publisher    = {OSA},
      reportid     = {PUBDB-2017-00242},
      pages        = {147 - 150},
      year         = {2016},
      abstract     = {We present a novel all-fiber pumped optical parametric
                      chirped pulse amplifier (OPCPA) architecture to generate
                      self-carrier-to-envelope-phase stable,
                      sub-eight-optical-cycle duration pulses at 7 μm wavelength
                      approaching millijoulelevel pulse energy at 100 Hz
                      repetition rate. The system yields a peak power of 1.1 GW
                      and, if focused to the diffraction limit, would reach a peak
                      intensity of 7 × 10$^{14}$ W∕cm$^2$. The OPCPA is pumped
                      by a 2 μm Ho:YLF chirped pulse amplifier to leverage the
                      highly efficient and broadband response of the nonlinear
                      crystal ZGP. The 7 μm seed at 100 MHz is generated via
                      difference frequency generation from an Er:Tm:Ho multi-arm
                      fiber frequency comb, and a fraction of its output optically
                      injects the Ho:YLF amplifier. Whilethe pulse bandwidth at 7
                      μm is perfectly suited for nonlinear and spectroscopic
                      applications, current parameters offer, for the first time,
                      to the best of our knowledge, the possibility to explore
                      strong-field physics in an entirely new wavelength range
                      with a ponderomotive force 77 times larger than from an 800
                      nm source. The overall OPCPA system is very compact and
                      provides a new tool for investigations directly in the
                      molecular fingerprint region of the electro-magnetic
                      spectrum or to drive high harmonic generation to produce
                      fully coherent x-rays in the multi-kiloelectron-volt range
                      and possibly zeptosecond temporal waveforms.},
      cin          = {FS-CFEL-2 / CFEL-UFOX},
      ddc          = {530},
      cid          = {I:(DE-H253)FS-CFEL-2-20120731 /
                      I:(DE-H253)CFEL-UFOX-20160927},
      pnm          = {6211 - Extreme States of Matter: From Cold Ions to Hot
                      Plasmas (POF3-621)},
      pid          = {G:(DE-HGF)POF3-6211},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000370815900007},
      doi          = {10.1364/OPTICA.3.000147},
      url          = {https://bib-pubdb1.desy.de/record/316850},
}