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@PHDTHESIS{Rompotis:295216,
author = {Rompotis, Dimitrios},
othercontributors = {Drescher, Markus},
title = {{A} single-shot nonlinear autocorrelation approach for
time-resolved physics in the vacuum ultraviolet spectral
range},
issn = {1435-8085},
school = {Universität Hamburg},
type = {Dissertation},
address = {Hamburg},
publisher = {Verlag Deutsches Elektronen-Synchrotron},
reportid = {PUBDB-2016-01132, DESY-THESIS-2016-002},
series = {DESY-THESIS},
pages = {179},
year = {2016},
note = {Dissertation, Universität Hamburg, 2015},
abstract = {In this work, a single-shot temporal metrology scheme
operating in the vacuum-extreme ultraviolet spectral range
has been designed and experimentally implemented. Utilizing
an anti-collinear geometry, a second-order intensity
autocorrelation measurement of a vacuum ultraviolet pulse
can be performed by encoding temporal delay information on
the beam propagation coordinate. An ion-imaging
time-of-flight spectrometer, offering micrometer resolution
has been set-up for this purpose. This instrument enables
the detection of a magnified image of the spatial
distribution of ions exclusively generated by direct two
photon absorption in the combined counter-propagating pulse
focus and thus obtain the second-order intensity
autocorrelation measurement on a single-shot
basis.Additionally, an intense VUV light source based on
high-harmonic generation has been experimentally realized.
It delivers intense sub-20 fs Ti:Sa fifth-harmonic pulses
utilizing a loose-focusing geometry in a long Ar gas cell.
The VUV pulses centered at 161.8 nm reach pulse energies of
1.1 μJ per pulse, while the corresponding pulse duration is
measured with a second-order, fringe-resolved
autocorrelation scheme to be 18 ± 1 fs on average.
Non-resonant, two-photon ionization of Kr and Xe and
three-photon ionization of Ne verify the fifth-harmonic
pulse intensity and indicate the feasibility of multi-photon
VUV pump/VUV probe studies of ultrafast atomic and molecular
dynamics. Finally, the extended functionality of the
counter-propagating pulse metrology approach is demonstrated
by a single-shot VUV pump/VUV probe experiment aiming at the
investigation of ultrafast dissociation dynamics of
molecular oxygen excited in the Schumann-Runge continuum at
162 nm.},
cin = {UNI/EXP / FS-FL},
cid = {$I:(DE-H253)UNI_EXP-20120731$ / I:(DE-H253)FS-FL-20120731},
pnm = {6211 - Extreme States of Matter: From Cold Ions to Hot
Plasmas (POF3-621)},
pid = {G:(DE-HGF)POF3-6211},
experiment = {EXP:(DE-MLZ)NOSPEC-20140101},
typ = {PUB:(DE-HGF)3 / PUB:(DE-HGF)29 / PUB:(DE-HGF)11},
doi = {10.3204/DESY-THESIS-2016-002},
url = {https://bib-pubdb1.desy.de/record/295216},
}