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Projecting picosecond lattice dynamics through x-ray topography

  • Ola Synnergren
  • Michael Harbst
  • T Missalla
  • Jörgen Larsson
  • G Katona
  • R Neutze
  • R Wouts
Publiceringsår: 2002
Språk: Engelska
Sidor: 3727-3729
Publikation/Tidskrift/Serie: Applied Physics Letters
Volym: 80
Nummer: 20
Dokumenttyp: Artikel
Förlag: American Institute of Physics


A method for time-resolved x-ray diffraction studies has been demonstrated. As a test case, coherent acoustic phonon propagation into crystalline InSb is observed using a laser plasma x-ray source. An extended x-ray topogram of the semiconductor's surface was projected onto a high spatial resolution x-ray detector and acoustic phonons were excited by rapidly heating the crystal's surface with a femtosecond laser pulse. A correlation between the spatial position on the x-ray detector and the time of arrival of the laser pulse was encoded into the experimental geometry by tilting the incident laser pulse with an optical grating. This approach enabled a temporal window of 200 ps to be sampled in a single topogram, thereby negating the disadvantages of pulse-to-pulse fluctuations in the intensity and spectrum of the laser-plasma source. (C) 2002 American Institute of Physics.



  • Atom and Molecular Physics and Optics


  • ISSN: 0003-6951

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