Dresden 2009 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 31: Application of Thin Films II
DS 31.3: Vortrag
Donnerstag, 26. März 2009, 16:45–17:00, GER 37
Broadband multilayer soft X-ray mirrors for attosecond pulse formation at photon energies above 100 eV — •Michael Hofstetter1, Andrew Aquila2, Martin Schulze3, Markus Fiess3, Eleftherios Gouliemakis3, Joerg Schuster1, Martin Huth4, Ferenc Krausz3, and Ulf Kleineberg1 — 1LMU Physik — 2CXRO — 3MPQ — 4LMU Chemie
We report on the development, fabrication and application of multilayer mirrors as broadband soft-X-ray optical components for the formation of attosecond (1 asec=10−18s)pulses from high harmonic radiation. Until recently, attosecond physics was merely confined to the photon energy range below 100 eV due to the properties of Mo/Si multilayer and single isolated pulses of 80 asec pulse duration have been achieved [Goulielmakis et.al.]. For many applications, e.g. in the characterization of the photoemission dynamics from solid surfaces or the characterization of ultrafast surface plasmon dynamics in metallic nanostructures by attosecond pump-probe spectroscopy, higher photon energies are desirable to address deeper bound electronic core states or to increase the kinetic energy of the emitted photoelectrons [Cavalieri et.al., Stockman et.al.]. Here, we introduce new aperiodic broad bandwidth multilayer systems based on lanthanum (e.g. LaMo, LaB4CMo, LaB4C, MoB4C),for the 100-190 eV photon energy range. Multilayer properties like interface roughness, interlayer formation and reflectivity are discussed. Finally, first applications for spectral filtering of the HHG comb above 100 eV are presented.