dc.identifier.uri |
http://dx.doi.org/10.15488/12759 |
|
dc.identifier.uri |
https://www.repo.uni-hannover.de/handle/123456789/12859 |
|
dc.contributor.author |
Jusko, Christoph
|
eng |
dc.date.accessioned |
2022-10-04T13:20:03Z |
|
dc.date.available |
2022-10-04T13:20:03Z |
|
dc.date.issued |
2022 |
|
dc.identifier.citation |
Jusko, Christoph: Investigation of nonlinear dynamics in and via femtosecond filaments in gases. Hannover : Gottfried Wilhelm Leibniz Universität Hannover, Diss., 2022, xiv, 168 S. DOI: https://doi.org/10.15488/12759 |
eng |
dc.description.abstract |
Intense, ultrashort laser pulses are required for the study of many nonlinear optical effects and are of utmost relevance for various applications from ultrafast X-ray radiography in medicine up to remote sensing of the atmosphere. Increasing their
intensity while interacting with matter eventually leads to the generation of laser-induced plasma. This plasma has fascinating optical properties such as a negative refractive index contribution proportional to the free electron density or the lack of a damage threshold, giving the prospect of a multitude of new applications based on the manipulation of light with plasma. The realization of such plasma-based applications requires a precise knowledge of its properties and temporal evolution, as the plasma remains for much longer than its generation event. A method to generate and investigate ultrashort laser pulses as well as laser-induced plasma is femtosecond filamentation. It represents the formation of an intense self-guided light channel in a medium for distances much longer than the Rayleigh range of the same beam focused in vacuum. It is formed by a dynamic balance of Kerr-induced self-focusing and plasma-induced defocusing. In this thesis, it is demonstrated that femtosecond filamentation can be employed as a tool to investigate the temporal evolution of laser-induced plasma. The study is realized in various atomic and molecular gas atmospheres via measuring the temporal evolution of the enhancement of third harmonic radiation generated by a femtosecond filament which is intercepted by a laser-induced plasma spot. Significant differences for the lifetime of the plasma in atomic and molecular gas atmospheres are found. Further, a novel method for the complete spatio-temporal characterization of a femtosecond filament along its length is presented. It is based on controlled filament termination at various positions along its length in combination with spatio-temporal pulse characterization and numerical backpropagation of the filament pulses to the termination point. The capabilities of the method are illustrated by revealing complex spatio-temporal dynamics and couplings during filament propagation. |
eng |
dc.language.iso |
eng |
eng |
dc.publisher |
Hannover : Institutionelles Repositorium der Leibniz Universität Hannover |
|
dc.rights |
CC BY 3.0 DE |
eng |
dc.rights.uri |
http://creativecommons.org/licenses/by/3.0/de/ |
eng |
dc.subject |
femtosecond filamentation |
eng |
dc.subject |
laser-induced plasma |
eng |
dc.subject |
plasma lifetime |
eng |
dc.subject |
filament pulse characterization |
eng |
dc.subject |
laserinduziertes Plasma |
ger |
dc.subject |
Plasmalebensdauer |
ger |
dc.subject |
Filamentpulscharakterisierung |
ger |
dc.subject |
Femtosekundenfilamentation |
ger |
dc.subject.ddc |
530 | Physik
|
eng |
dc.title |
Investigation of nonlinear dynamics in and via femtosecond filaments in gases |
eng |
dc.type |
DoctoralThesis |
eng |
dc.type |
Text |
eng |
dc.description.version |
publishedVersion |
eng |
tib.accessRights |
frei zug�nglich |
eng |