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- W2810561640 abstract "The thesis reports on the influence of customisable and highly light absorbingsurfaces on laser-plasma experiments. For the first time, a thin microstructuredsilicon substrate is interacting with a short laser pulse with peak intensity exceeding 1020 W=cm2. In this process, electrons are accelerated and pushed intothe target to relativistic energies. Furthermore, ions are accelerated perpendicular to the target surfaces and electromagnetic radiation is generated.In the framework of this work, a fabrication setup is developed that producescustomisable structured silicon surfaces using a laser-assisted ablation andetching process with light pulses of femtosecond pulse length and the effectof laser-induced periodic surface structures (LIPSS). The evolving structure consists of conical silicon spikes with a significant increase in light absorption overa broad spectral range in the visible and infrared region. The experimentalsetup is demonstrated together with a characterisation of the resulting surfacestructures. Thereby, a precise prediction of needle height and separation ispossible.Following, these structured silicon targets are compared to flat foils and different periodic geometric structures, typically used in laser-plasma experiments,in an experimental campaign using the petawatt class Vulcan laser system ofthe Central Laser Facility, Oxfordshire, UK. Spectral and spatial investigation ofreflected laser light, X-ray generation, electron and ion acceleration in the experiment demonstrate an enhanced performance of the robust microstructuredsilicon needle structure facing the incident laser pulse. A significant increasein high energetic electrons, ions and brilliant X-ray radiation is observed incomparison to flat foils and targets with geometric structures. Reflection lossesfrom the interaction area are decreased substantially.With the results of the experimental campaign a combination of the microstructured silicon surfaces with different materials is motivated. E.g. proton-richmaterials can generate a reliable and auspicious source of laser-acceleratedprotons. Joining the structured target with a confined piece of material, pointlike sources of brilliant X-ray radiation of selectable photon energy becomeavailable. Employing the fabrication setup developed within the frameworkof this thesis a valuable addition to the scope of the Detektor & Targetlabor isgiven. The further development of the setup towards high-repetition rate laserfacilities, production of customisable and more complex targets and evaluationof applications for highly light absorbing surfaces is promising." @default.
- W2810561640 created "2018-07-10" @default.
- W2810561640 creator A5054334019 @default.
- W2810561640 date "2018-01-01" @default.
- W2810561640 modified "2023-09-27" @default.
- W2810561640 title "Fabrication of micro-structured surfaces with increased light absorption and their influence on intense laser-plasma experiments" @default.
- W2810561640 hasPublicationYear "2018" @default.
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