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000646122 041__ $$aEnglish
000646122 1001_ $$0P:(DE-H253)PIP1094389$$aAzzolin, Agata$$b0$$eCorresponding author$$gfemale
000646122 245__ $$aAdvances in High-Order Harmonic Sources and Applications to Free-Electron Laser Pulse Characterization$$f2021-11-01 - 2025-12-31
000646122 260__ $$c2026
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000646122 502__ $$aDissertation, University of Hamburg, 2026$$bDissertation$$cUniversity of Hamburg$$d2026$$o2026-02-09
000646122 520__ $$aAttosecond and few-femtosecond light pulses provide the time resolution required to track and control the very first instants of electron dynamics in molecules and condensed matter. Since its first demonstration, High-order Harmonic Generation (HHG) sources have been at the core of experimental schemes aiming at unravelling ultrafast electron motion. This thesis reports advancements in high-order harmonic sources and their applications to both solid-state spectroscopy and Free-Electron Laser (FEL) pulse characterization. First, it demonstrates and rationalizes efficient soft X-ray HHG in the so-called overdriven regime enabled by a custom-designed differentially pumped glass chip. This development directly addresses some of the technical challenges of conventional high-photon-energy HHG sources, providing a more accessible approach. Second, this work presents results on solidstate High-order Harmonic Generation (sHHG) spectroscopy in crystalline, amorphous, and semi-periodic TiO2 samples. The experiment showcases the potential of HHG not only as a source, but also as a spectroscopic probe of the valence electrons governing materials functional properties. Finally, this thesis reports the experimental validation of Double-Blind Holography (DBH) of ultrashort FEL pulses. This is a fully optical platform for single-shot temporal haracterization, phase retrieval, and few-femtosecond resolution delay tagging that is based on the interference with an unknown external field, in this case a standard HHG source. Together, these developments extend the capabilities of high-order harmonic sources, opening new scenarios for investigating and controlling ultrafast electron dynamics in atoms, molecules and condensed matter, both with table-top schemes and at FELs.
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000646122 7001_ $$0P:(DE-H253)PIP1023238$$aCalegari, Francesca$$b1$$eThesis advisor
000646122 7001_ $$0P:(DE-H253)PIP1003945$$aDrescher, Markus$$b2$$eThesis advisor
000646122 8564_ $$uhttps://ediss.sub.uni-hamburg.de/handle/ediss/12204
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