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@ARTICLE{Chitgar:891900,
      author       = {Chitgar, Z. M. and Adam, R. and Greb, C. and Lehrach, A.
                      and Büscher, M. and Gibbon, P.},
      title        = {{T}heory of circularly polarized harmonic generation using
                      bi-colour lasers in underdense plasmas},
      journal      = {Plasma physics and controlled fusion},
      volume       = {63},
      number       = {3},
      issn         = {1361-6587},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {FZJ-2021-01812},
      pages        = {035023 -},
      year         = {2021},
      abstract     = {Circularly polarized (CP) extreme ultraviolet- and x-ray
                      radiation is an essential tool for analyzing the magnetic
                      properties of materials. Elliptically polarized high
                      harmonic generation (HHG) has been demonstrated by focusing
                      bi-chromatic (800 + 400 nm wavelengths),
                      counter-rotating CP laser pulses into gas targets (Fleischer
                      et al 2014 Nat. Photonics 8 543). More recent theoretical
                      studies indicate that a bi-circular laser driver can also
                      work in both under- and overdense plasmas with analogous
                      selection rules to those in gases: for example, every third
                      harmonic is suppressed and adjacent harmonics have opposite
                      helicity for counter-polarized CP ω0 and 2ω0 pumps. In
                      this work, an analytical theory of bi-circular HHG from
                      underdense plasmas is formulated which provides quantitative
                      predictions of harmonic efficiency scaling, selectivity and
                      helicity for both co- and counter-polarized drivers of
                      arbitrary frequency ratio. This is compared to a fully
                      non-linear, one-dimensional fluid model and particle-in-cell
                      simulations, showing good agreement with both.},
      cin          = {JSC / PGI-6 / IKP-4 / JARA-HPC},
      ddc          = {620},
      cid          = {I:(DE-Juel1)JSC-20090406 / I:(DE-Juel1)PGI-6-20110106 /
                      I:(DE-Juel1)IKP-4-20111104 / $I:(DE-82)080012_20140620$},
      pnm          = {5111 - Domain-Specific Simulation $\&$ Data Life Cycle Labs
                      (SDLs) and Research Groups (POF4-511) / Kinetic Plasma
                      Simulation with Highly Scalable Particle Codes
                      $(jzam04_20190501)$},
      pid          = {G:(DE-HGF)POF4-5111 / $G:(DE-Juel1)jzam04_20190501$},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000612935200001},
      doi          = {10.1088/1361-6587/abd9e1},
      url          = {https://juser.fz-juelich.de/record/891900},
}