A single-shot nonlinear autocorrelation approach for time-resolved physics in the vacuum ultraviolet spectral range

Rompotis, Dimitrios; Drescher, Markus

Book/Report/Dissertation / PhD Thesis

PUBDB-2016-01132

A single-shot nonlinear autocorrelation approach for time-resolved physics in the vacuum ultraviolet spectral range

Rompotis, D. (Corresponding author)Extern* ; Drescher, M. (Thesis advisor)>Extern*

2016
Verlag Deutsches Elektronen-Synchrotron Hamburg

Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 179 pp. (2016) [10.3204/DESY-THESIS-2016-002] = Dissertation, Universität Hamburg, 2015

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Please use a persistent id in citations: doi:10.3204/DESY-THESIS-2016-002

Report No.: DESY-THESIS-2016-002

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.

Note: Dissertation, Universität Hamburg, 2015

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