% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@PHDTHESIS{Azzolin:646122,
      author       = {Azzolin, Agata},
      othercontributors = {Calegari, Francesca and Drescher, Markus},
      title        = {{A}dvances in {H}igh-{O}rder {H}armonic {S}ources and
                      {A}pplications to {F}ree-{E}lectron {L}aser {P}ulse
                      {C}haracterization},
      school       = {University of Hamburg},
      type         = {Dissertation},
      reportid     = {PUBDB-2026-00724},
      pages        = {162},
      year         = {2026},
      note         = {Dissertation, University of Hamburg, 2026},
      abstract     = {Attosecond 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.},
      cin          = {FS-ATTO},
      cid          = {I:(DE-H253)FS-ATTO-20170403},
      pnm          = {631 - Matter – Dynamics, Mechanisms and Control
                      (POF4-631) / 6G2 - FLASH (DESY) (POF4-6G2)},
      pid          = {G:(DE-HGF)POF4-631 / G:(DE-HGF)POF4-6G2},
      experiment   = {EXP:(DE-H253)CFEL-Exp-20150101 /
                      EXP:(DE-H253)F-FL26-20150901},
      typ          = {PUB:(DE-HGF)11},
      urn          = {urn:nbn:de:gbv:18-ediss-135077},
      doi          = {10.3204/PUBDB-2026-00724},
      url          = {https://bib-pubdb1.desy.de/record/646122},
}