Mainz 2017 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 29: Ultrashort Laser Pulses: Generation and Applications (with Q)
A 29.2: Vortrag
Donnerstag, 9. März 2017, 14:45–15:00, P 5
Development and characterization of a pulse preserving XUV multilayer monochromator — •Tanja Neumann1, Yudong Yang2, Roland Mainz2, Franz Kärtner2, and Thorsten Uphues1 — 1CFEL, Attosecond Research and Science Group, Hamburg University, Luruper Chaussee 149, 22761 Hamburg — 2Center for Free-Electron Laser Science, DESY and Department of Physics, University of Hamburg, Hamburg, Germany
HHG based time-resolved experiments in the XUV are a key technologie to study atomic, surface and chemical processes in realtime. Some of these experiments require high energy resolution to distinguish between spin compenents or resolve chemical shifts in the corresponding energy spectra. In the frame work of a master thesis a narrow bandwidth multilayer mirror monochromator (MMM) was developed for separation and energy tunability of a well defined spectral bandwidth from a high order harmonic spectrum generated by 25 femtosecond laser pulses at 800 nm central wavelength. The MMM is tailored to the experimental requirements of a surface experiment and is able to select a defined bandwidth of less than 1 eV from the harmonic spectrum in the photon energy range between 90 and 98 eV. For time resolved experiments it designedto be used at the same time to recombine the laser pulse and the XUV pulse and focus them down to the experiment maintaining temoral and spectral overlap in the given energy range. A major advantage of the MMM is the preservation of the time structure of the XUV and laser pulse, thus addition dispersion correction is not needed.