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| Dissertation / PhD Thesis | PUBDB-2021-00194 |
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2020
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Please use a persistent id in citations: doi:10.3204/PUBDB-2021-00194
Abstract: An advent of powerful sources producing intense and ultrashort laserpulses containing high-energy photons opened up a wide range of possibilitiesto conduct experiments formerly achievable only through theoretical calculationsand models. This thesis provides a complex overview of processes which occurright after arrival of the first photons, through lattice heating, up to resolidifica-tion and formation of irreversible changes. Irradiated spots and craters formed invarious materials are examined employing a wide range of microscopic and spec-troscopic methods which provide a deep insight into laser-induced modificationssuch as detachment of a graphene layer from SiC substrate or thermally-induceddiffusion of tellurium inclusions through CdTe lattice. An increased emphasisis placed on beam characterization utilizing ablation and desorption imprints insuitable solids. A proper knowledge of the beam fluence profile may serve forevaluation of diverse damage thresholds as well as for modelling of the pulsepropagation or consequent retrieval of otherwise unmeasurable opacity of warmdense aluminium plasma heated to temperatures exceeding tens of thousands ofKelvins. Moreover, the method of desorption imprints is extended to accuratecharacterization of pulses delivered at MHz repetition rate. This work aims tocontribute to general understanding of interaction between short-wavelength laserpulses and matter at different time scales.
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