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@ARTICLE{Snezhko:829294,
      author       = {Snezhko, A. V. and Gundareva, Irina and Lyatti, M. V. and
                      Volkov, O. Y. and Pavlovskiy, V. V. and Poppe, U. and Divin,
                      Yuri},
      title        = {{T}erahertz {J}osephson spectral analysis and its
                      applications},
      journal      = {Superconductor science and technology},
      volume       = {30},
      number       = {4},
      issn         = {1361-6668},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {FZJ-2017-03024},
      pages        = {044001 -},
      year         = {2017},
      abstract     = {Principles of Hilbert-transform spectral analysis (HTSA)
                      are presented and advantages of the technique in the
                      terahertz (THz) frequency range are discussed. THz HTSA
                      requires Josephson junctions with high values of
                      characteristic voltages I c R n and dynamics described by a
                      simple resistively shunted junction (RSJ) model. To meet
                      these requirements, [001]- and [100]-tilt YBa2Cu3O7−x
                      bicrystal junctions with deviations from the RSJ model less
                      than $1\%$ have been developed. Demonstrators of
                      Hilbert-transform spectrum analyzers with various cryogenic
                      environments, including integration into Stirling coolers,
                      are described. Spectrum analyzers have been characterized in
                      the spectral range from 50 GHz to 3 THz. Inside a power
                      dynamic range of five orders, an instrumental function of
                      the analyzers has been found to have a Lorentz form around a
                      single frequency of 1.48 THz with a spectral resolution as
                      low as 0.9 GHz. Spectra of THz radiation from optically
                      pumped gas lasers and semiconductor frequency multipliers
                      have been studied with these spectrum analyzers and the
                      regimes of these radiation sources were optimized for a
                      single-frequency operation. Future applications of HTSA will
                      be related with quick and precise spectral characterization
                      of new radiation sources and identification of substances in
                      the THz frequency range.},
      cin          = {PGI-5},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-5-20110106},
      pnm          = {144 - Controlling Collective States (POF3-144)},
      pid          = {G:(DE-HGF)POF3-144},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000425701300001},
      doi          = {10.1088/1361-6668/aa5ab5},
      url          = {https://juser.fz-juelich.de/record/829294},
}