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@ARTICLE{Linker:632800,
      author       = {Linker, Thomas M. and Halavanau, Aliaksei and Kroll, Thomas
                      and Benediktovitch, Andrei and Zhang, Yu and Michine, Yurina
                      and Chuchurka, Stasis and Abhari, Zain and Ronchetti,
                      Daniele and Fransson, Thomas and Weninger, Clemens and
                      Fuller, Franklin D. and Aquila, Andy and Alonso-Mori,
                      Roberto and Boutet, Sebastien and Guetg, Marc W. and
                      Marinelli, Agostino and Lutman, Alberto A. and Yabashi,
                      Makina and Inoue, Ichiro and Osaka, Taito and Yamada, Jumpei
                      and Inubushi, Yuichi and Yamaguchi, Gota and Hara, Toru and
                      Babu, Ganguli and Salpekar, Devashish and Sayed, Farheen N.
                      and Ajayan, Pulickel M. and Kern, Jan and Yano, Junko and
                      Yachandra, Vittal K. and Kling, Matthias F. and Pellegrini,
                      Claudio and Yoneda, Hitoki and Rohringer, Nina and Bergmann,
                      Uwe},
      title        = {{A}ttosecond {I}nner-{S}hell {L}asing at {A}ngstrom
                      {W}avelengths},
      reportid     = {PUBDB-2025-02225, arXiv:2409.06914},
      year         = {2025},
      abstract     = {Since the invention of the laser nonlinear effects such as
                      filamentation, Rabi-cycling and collective emission have
                      been explored in the optical regime leading to a wide range
                      of scientific and industrial applications. X-ray free
                      electron lasers (XFELs) have led to the extension of many
                      optical techniques to X-rays for their advantages of
                      angstrom scale spatial resolution and elemental specificity.
                      One such example is XFEL driven population inversion of 1s
                      core hole states resulting in inner-shell K$α$ (2p to 1s)
                      X-ray lasing in elements ranging from neon to copper, which
                      has been utilized for nonlinear spectroscopy and development
                      of next generation X-ray laser sources. Here we show that
                      strong lasing effects, similar to those observed in the
                      optical regime, can occur at 1.5 to 2.1 angstrom wavelengths
                      during high intensity (> ${10^{19}}$ W/cm${^{2}}$) XFEL
                      driven inner-shell lasing and superfluorescence of copper
                      and manganese. Depending on the temporal substructure of the
                      XFEL pump pulses(containing ${~10^{6}}$ - ${10^{8}}$
                      photons) i, the resulting inner-shell X-ray laser pulses can
                      exhibit strong spatial inhomogeneities as well as spectral
                      splitting, inhomogeneities and broadening. Through 3D
                      Maxwell Bloch theory we show that the observed spatial
                      inhomogeneities result from X-ray filamentation, and that
                      the spectral splitting and broadening is driven by Rabi
                      cycling with sub-femtosecond periods. Our simulations
                      indicate that these X-ray pulses can have pulse lengths of
                      less than 100 attoseconds and coherence properties that open
                      the door for quantum X-ray optics applications.},
      cin          = {FS-TUX},
      cid          = {I:(DE-H253)FS-TUX-20170422},
      pnm          = {631 - Matter – Dynamics, Mechanisms and Control
                      (POF4-631) / AIM, DFG project G:(GEPRIS)390715994 - EXC
                      2056: CUI: Advanced Imaging of Matter (390715994) /
                      HIDSS-0002 - DASHH: Data Science in Hamburg - Helmholtz
                      Graduate School for the Structure of Matter
                      $(2019_IVF-HIDSS-0002)$},
      pid          = {G:(DE-HGF)POF4-631 / G:(GEPRIS)390715994 /
                      $G:(DE-HGF)2019_IVF-HIDSS-0002$},
      experiment   = {EXP:(DE-MLZ)External-20140101 /
                      EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)25},
      eprint       = {2409.06914},
      howpublished = {arXiv:2409.06914},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2409.06914;\%\%$},
      doi          = {10.3204/PUBDB-2025-02225},
      url          = {https://bib-pubdb1.desy.de/record/632800},
}