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@PHDTHESIS{Luo:640323,
      author       = {Luo, Cheng},
      othercontributors = {Laarmann, Tim and Drescher, Markus},
      title        = {{H}igh-power {F}ew-cycle {MID}-{IR} {P}ulse {G}eneration
                      for {V}ibrational {S}pectroscopy},
      school       = {University of Hamburg},
      type         = {Dissertation},
      reportid     = {PUBDB-2025-04774},
      pages        = {101},
      year         = {2025},
      note         = {Dissertation, University of Hamburg, 2025},
      abstract     = {High-power, high-energy, ultrashort, mid-infrared (MID-IR)
                      laser systems operating at high repetition rates are of
                      significant interest for coherent vibrational spectroscopy
                      investigations within the "fingerprint region'' (6-16 um).
                      First of all, the optical properties of Li-based nonlinear
                      crystals (NLC) for MID-IR generation are evaluated under
                      high power laser irradiation at $1030\,nm$ central
                      wavelength using a thermal imaging method. It turns out that
                      lithium gallium sulfide (LGS) crystal exhibits a relatively
                      low linear absorption coefficient < 0.002 $cm^{-1},$ the
                      lowest nonlinear absorption coefficient < 3.2 x $10^{-4}$
                      cm/W and a nonlinear refractive index < 6.4 x $10^{-15}$
                      $cm^{2}/W,$ positioning it as a highly promising material
                      candidate for MID-IR optical parametric chirped-pulse
                      amplifier (OPCPA) applications.Based on the LGS crystal, a
                      versatile design of a MID-IR OPCPA laser system is
                      developed, featuring two complementary operation modes
                      differ that in the group-delay dispersion (GDD) of the
                      signal pulse. One scheme provides a wavelength-tunable
                      source (from 4.2 to 11 um) at ~ 1 ps pulse width, while the
                      other scheme generates a broadband pulse (from 7 to 11 um)
                      centered at 9 um with 114 fs pulse duration, which
                      corresponds to about 3 optical cycles. Both MID-IR laser
                      operation modes exhibit high average power exceeding 200 mW
                      and high pulse energy of 1.2 uJ operating at 200 kHz, having
                      significant potential for vibrational spectroscopy and
                      microscopy making use of characteristic molecular
                      fingerprints in the MID-IR spectral range.Moreover, by
                      utilizing the broadband ultrashort MID-IR pulse, the
                      ultra-broadband vibrational sum-frequency generation
                      (BB-VSFG) spectroscopy is demonstrated using glucose pellets
                      as a proof-of-principle sample, revealing 8 characteristic
                      vibrational modes spanning from 800 to 1400 $cm^{-1}.$
                      Notably, the carbon-oxygen bond stretching mode at 1035
                      $cm^{-1}$ shows high sensitivity to biologically relevant 10
                      mM of glucose solution in the VSFG spectra. Consequently,
                      this methodology holds promise for blood sugar monitoring in
                      diabetic individuals.},
      cin          = {FS-PS},
      cid          = {I:(DE-H253)FS-PS-20131107},
      pnm          = {631 - Matter – Dynamics, Mechanisms and Control
                      (POF4-631) / AIM, DFG project G:(GEPRIS)390715994 - EXC
                      2056: CUI: Advanced Imaging of Matter (390715994)},
      pid          = {G:(DE-HGF)POF4-631 / G:(GEPRIS)390715994},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)11},
      urn          = {urn:nbn:de:gbv:18-ediss-126621},
      doi          = {10.3204/PUBDB-2025-04774},
      url          = {https://bib-pubdb1.desy.de/record/640323},
}