Berlin 2008 – scientific programme
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DS: Fachverband Dünne Schichten
DS 31: Application of Thin Films
DS 31.3: Talk
Thursday, February 28, 2008, 11:45–12:00, H 2032
Design, Characterization and Applications of Broadband MoSi- Multilayer Mirrors for Attosecond XUV Pulses — •Michael Hofstetter1, Andy Aquila3, Eleftherios Gouliemakis2, Martin Schultze2, Matthias Uiberacker1, Eric Gullikson3, David Attwood3, Ference Krausz2, and Ulf Kleineberg1 — 1LMU Munich — 2MPI for Quantum Optics — 3CXRO Berkeley Lab
Multilayer(ML)-coated XUV mirrors in combination with ultrathin metal transmission filters are known to be very suitable for spectral filtering and guiding of single attosecond (asec) XUV pulses from the near-cutoff region of High Harmonic Generation (HHG) sources in rare gases. We report on the design of periodic and aperiodic, broadband (15 - 30 eV) Mo/Si ML centered at ≈ 85 eV, theoretically developed by a needle algorithm code (optilayer) for optimum pulse response. Recent results published have demonstrated the filtering of single 170 asec pulses, recorded in XUV pump/IR probe streaking experiments, using an additional 150 nm Zr filter.[1] Even shorter pulse durations towards the (sub) 100 asec range are expected. The ML stacks have been fabricated by advanced Dual Ion Beam Deposition (DIBD) controlled by in-situ ellipsometry and ex-situ characterized by synchrotron radiation measurements at the Advanced Light Source. Finally, the extension of asec ML mirror technology towards higher photon energies exceeding 100 eV using different materials (La and B4C) will be discussed, which could enable new photoemission experiments on solid surfaces with sub 100 asec time resolution.
[1]New Journal of Physics 9 (2007) 243