Berlin 2008 – scientific programme
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O: Fachverband Oberflächenphysik
O 43: Poster Session II - MA 141/144 (Surface Spectroscopy on Kondo Systems; Frontiers of Surface Sensitive Electron Microscopy; Methods: Scanning Probe Techniques+Electronic Structure Theory+Other; Time-Resolved Spectroscopy of Surface Dynamics with EUV and XUV Radiation; joined by SYNF posters)
O 43.38: Poster
Tuesday, February 26, 2008, 18:30–19:30, Poster F
An XUV- Split and Delay Line at the Free Electron Laser in Hamburg — •Torben Beeck1, Mitsuru Nagasono1,2, Holger Meyer1, Sven Gieschen1, Martin Beye1, William F. Schlotter1, Florian Sorgenfrei1, Alexander Föhlisch1, and Wilfried Wurth1 — 1Institut für Experimentalphysik Universität Hamburg, Germany — 2XFEL Project Head Office, RIKEN, Hyogo, Japan
At the Free Electron Laser in Hamburg (FLASH) we are integrating a soft x-ray beam split and delay line to the plane grating monochromator beamline (PG2). This system will enable pump-probe spectroscopy of ultrafast dynamics. Pulse to pulse timing jitter is circumvented by the controlled synchronisation of the delay line. The wavefront of the incoming beam is divided by illuminating the edge of a mirror. By controlling the optical path length for each beam, pulse delays as short as 10 fs or as long as 20 ps can be generated.
The system employs four mirrors to split and mix the beam and four mirrors to control the delay. Each mirror is a silicon single crystal with a diamond like carbon coating. The four delay mirrors are arranged at grazing incidence forming a parallelogram. Together with the beam splitters this forms an adjustable path Mach-Zehnder interferometer. For stability the delay mirrors are fixed to a rigid support structure. Simply translating the structure imparts a delay between the pulses.
This work is supported by the BMBF in the framework of the Forschungsschwerpunkt 301, "FLASH: Matter in the light of ultrafast and extremely intense x-ray pulses".