Dresden 2006 – scientific programme
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DS: Dünne Schichten
DS 24: Poster presentation
DS 24.29: Poster
Tuesday, March 28, 2006, 15:00–17:30, P2
Production and characterization of bandwidth- and phase-optimised La/B4C-multilayer-mirrors for the reflection of ultra short X-ray pulses at 180eV — •Stefan Hendel, Ulrich Neuhäusler, Wiebke Hachmann, Ulf Kleineberg, and Ulrich Heinzmann — Faculty of Physics, University of Bielefeld, D-33615 Bielefeld
The applicability of reflective optical components for the soft X-ray region depends upon the existence of multilayer-optics. In particular the optimisation of multilayers for the soft X-ray spectral range call for new material combinations. For the photon energy range of about 180eV Lanthanum (La) is favoured as the absorber material and Boroncarbide (B4C) as the spacer material. Thin periodic layer systems of those materials with double layer periods of 3.5nm are produced by UHV Electron Beam Evaporation combined with Ion Polishing. The characterization of the layer purity is done by Sputter Auger Spectroscopy, whilst structural analysis is performed by X-ray Diffraction, Transmission Electron Microscopy and Ellipsometry. A further goal is the production of aperiodic (chirped) La/B4C-multilayers which exhibit an optimised spectral bandwidth and spectral phase required for the reflection of ultra short soft X-ray pulses from High Harmonic Sources. We report on first theoretical as well as experimental results.