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@ARTICLE{Volkov:893855,
      author       = {Volkov, Oleg and Pavlovskiy, Valery and Gundareva, Irina
                      and Khabibullin, Rustam and Divin, Yuriy},
      title        = {{I}n {S}itu {H}ilbert-{T}ransform {S}pectral {A}nalysis of
                      {P}ulsed {T}erahertz {R}adiation of {Q}uantum {C}ascade
                      {L}asers by {H}igh- {T} c {J}osephson {J}unctions},
      journal      = {IEEE transactions on terahertz science and technology},
      volume       = {11},
      number       = {3},
      issn         = {2156-3446},
      address      = {New York, NY},
      publisher    = {IEEE},
      reportid     = {FZJ-2021-02879},
      pages        = {330 - 338},
      year         = {2021},
      abstract     = {We have studied the applicability of high- Tc Josephson
                      junctions (JJs) and Hilbert-transform spectral analysis
                      (HTSA) for characterization of pulsed terahertz (THz)
                      radiation. We have reconsidered the extension of HTSA into
                      the THz range, including an impact of such emerging factors
                      as nonequilibrium voltage fluctuations and dc Joule heating
                      in high- Tc JJs, and found an unexpected weak temperature
                      dependence of Josephson linewidth δf and a spectral
                      dependence δf(f) with a minimum. Due to this analysis, we
                      have chosen YBa 2 Cu 3 O 7-x bicrystal JJs for experimental
                      study. The JJs have analyzed pulsed THz radiation from
                      quantum cascade lasers (QCLs) located in the same cryogenic
                      environment at 50 K. The spectra recovered by the JJ with Rn
                      = 43 Ω consist of a line with a central frequency around
                      2.2 THz, which have a symmetrical form and the linewidth of
                      90 GHz close to the intrinsic Josephson linewidth of this
                      JJ. The spectra measured by the JJ with Rn = 7 Ω and the
                      intrinsic Josephson linewidth of 16 GHz consist of several
                      lines at the frequencies fi around 2.2 THz, which are due to
                      the excitation of different resonant modes in the active
                      volume of the QCL. The difference between the fitted central
                      frequencies f 2 - f 1 of the strong lines and the ratio of
                      their intensities are in agreement with the spectrum of the
                      same QCL measured by Fourier spectroscopy. The developed
                      technique paves the way for detailed and rapid
                      characterization of pulsed THz sources in the frequency
                      domain.},
      cin          = {PGI-5},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-5-20110106},
      pnm          = {5353 - Understanding the Structural and Functional Behavior
                      of Solid State Systems (POF4-535)},
      pid          = {G:(DE-HGF)POF4-5353},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000645862300009},
      doi          = {10.1109/TTHZ.2020.3034815},
      url          = {https://juser.fz-juelich.de/record/893855},
}