A matter of brightness: table-top X-ray generation inside waveguides and X-ray holography with single free-electron laser pulses

Vassholz, Malte Julian Udo

dc.contributor.advisor	Salditt, Tim Prof. Dr.
dc.contributor.author	Vassholz, Malte Julian Udo
dc.date.accessioned	2022-03-22T14:55:11Z
dc.date.available	2023-03-25T00:50:08Z
dc.date.issued	2022-03-22
dc.identifier.uri	http://resolver.sub.uni-goettingen.de/purl?ediss-11858/13942
dc.identifier.uri	http://dx.doi.org/10.53846/goediss-9130
dc.language.iso	eng	de
dc.rights	Attribution-NonCommercial-NoDerivatives 4.0 International	*
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/4.0/	*
dc.subject.ddc	530	de
dc.title	A matter of brightness: table-top X-ray generation inside waveguides and X-ray holography with single free-electron laser pulses	de
dc.type	doctoralThesis	de
dc.contributor.referee	Salditt, Tim Prof. Dr.
dc.date.examination	2021-03-26	de
dc.subject.gok	Physik (PPN621336750)	de
dc.description.abstracteng	X-ray microscopy delivers insights into the structure of optically opaque bulk specimens with high spatial resolution. The source brightness poses a limit on the achievable resolution, however. While table-top X-ray sources are readily available but provide only low brightness, large-facility sources, such as synchrotrons and X-ray free-electron lasers (XFEL), generate radiation with high brightness and high coherence, but are not easily accessible. In this work, we report on and experimentally demonstrate a novel table-top X-ray source concept to generate spatially coherent X-rays with high brightness, that are emitted directly into the modes of a waveguide. Our estimate of the achievable gain increase demonstrates a substantial brightness improvement with respect to other table-top X-ray sources. In another set of experiments, we make use of the high peak brilliance of an XFEL to observe transient states of water under extreme conditions. In a pump-probe scheme, an infrared laser pulse generates a plasma after optical breakdown to seed a cavitation bubble, which we image with a single XFEL pulse. To get access to the pressure distribution within the shockwave of the cavitation bubbles, we calculate the quantitative phase shift based on a tailored phase-retrieval approach. We further complement nanofocus X-ray holography with time-resolved X-ray diffraction to obtain information on the molecular structure of water after dielectric breakdown. This combined approach delivers quantitative information from microscopic to molecular length scales with high temporal resolution.	de
dc.contributor.coReferee	Ropers, Claus Prof. Dr.
dc.subject.eng	X-ray microscopy	de
dc.subject.eng	X-ray sources	de
dc.subject.eng	phase retrieval	de
dc.subject.eng	waveguides	de
dc.subject.eng	pump-probe	de
dc.subject.eng	cavitation	de
dc.subject.eng	X-ray diffraction	de
dc.subject.eng	free-electron laser	de
dc.identifier.urn	urn:nbn:de:gbv:7-ediss-13942-9
dc.affiliation.institute	Fakultät für Physik	de
dc.description.embargoed	2023-03-25	de
dc.identifier.ppn	1797016636

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