FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W3040906132> ?p ?o ?g. }

• W3040906132 abstract "The invention of high power lasers with extremely short pulses ranging from femto to nanosecond duration opened a plethora of new studies and industrial applications ranging from laser based surgery, laser processing of materials in the semiconductor industry and photonics. However, the spatial distribution of the laser light field is mostly limited to Gaussian shapes, which can prove restrictive for many applications. In this thesis, we study a combined approach of ultrafast laser ablation with spatial beam shaping, which opens up new roads to understand the fundamental physical process of highly non-linear interaction of light and matter. We elucidate key aspects of the physics of material removal by using time-resolved transient reflectivity microscopy combined with a spatial light modulator (SLM). The materials we study in this thesis are water and gel as they are simple substitutes to study the ablation of tissue. The visualisation of laser induced shockwaves in gas at a gas/liquid interface provides information about the flow and the energy released during the expansion of the vaporised material. Yet, it is extremely difficult to properly image weak shocks or subsonic fronts of compressed gas due to the low refractive index change caused by the expanding front. In this thesis, we present a novel method to visualize such gas flows, by inducing multiple excitations in close proximity and imaging the resulting stationary shockwave. We generate the required excitation patterns using a spatial light modulator (SLM). The use of SLM opens up the possibility of creating more exotic illumination patterns that would lead to more complex effects. An important quantity in ablation studies is the amount of removed material. If the amount of removed material is known, one can gain insight into the dominant processes during material removal, such as evaporation, liquid motion and resolidification. However, in the case of liquid materials, this presents a challenge as the surface recovers after each excitation. To solve this problem, we study the ablation of gel, as with a gel, a crater will remain visible in the aftermath. We find that water and gel have an extremely similar expansion dynamics. This similarity allows us to estimate the removed material during water ablation based on the gel ablation aftermath. From those measurements and finite-difference-time-domain calculations, we find that the removed mass and the absorbed energy follow a similar trend. From this, we argue that the (highly supersonic) expansion velocity of the ablation plume is almost independent of the laser pulse energy. In the final part of the thesis, we present a beam shaping method for laser processing of materials. As liquid motion inside the molten layer of the material contributes to the material removal process, it would be advantageous to control this liquid flow. One could control and study the flow using spatially shaped laser beams. We demonstrate high-fidelity TopHat patterns as a first step towards reaching this goal." @default.
• W3040906132 created "2020-07-16" @default.
• W3040906132 creator A5069331908 @default.
• W3040906132 date "2020-06-04" @default.
• W3040906132 modified "2023-09-28" @default.
• W3040906132 title "Ultra-fast laser ablation dynamics using beam shaping" @default.
• W3040906132 hasPublicationYear "2020" @default.
• W3040906132 type Work @default.
• W3040906132 sameAs 3040906132 @default.
• W3040906132 citedByCount "0" @default.
• W3040906132 crossrefType "dissertation" @default.
• W3040906132 hasAuthorship W3040906132A5069331908 @default.
• W3040906132 hasConcept C120665830 @default.
• W3040906132 hasConcept C121332964 @default.
• W3040906132 hasConcept C127413603 @default.
• W3040906132 hasConcept C146978453 @default.
• W3040906132 hasConcept C168834538 @default.
• W3040906132 hasConcept C178596936 @default.
• W3040906132 hasConcept C192562407 @default.
• W3040906132 hasConcept C20788544 @default.
• W3040906132 hasConcept C2777903624 @default.
• W3040906132 hasConcept C2778315978 @default.
• W3040906132 hasConcept C2778902805 @default.
• W3040906132 hasConcept C49040817 @default.
• W3040906132 hasConcept C51141536 @default.
• W3040906132 hasConcept C520434653 @default.
• W3040906132 hasConceptScore W3040906132C120665830 @default.
• W3040906132 hasConceptScore W3040906132C121332964 @default.
• W3040906132 hasConceptScore W3040906132C127413603 @default.
• W3040906132 hasConceptScore W3040906132C146978453 @default.
• W3040906132 hasConceptScore W3040906132C168834538 @default.
• W3040906132 hasConceptScore W3040906132C178596936 @default.
• W3040906132 hasConceptScore W3040906132C192562407 @default.
• W3040906132 hasConceptScore W3040906132C20788544 @default.
• W3040906132 hasConceptScore W3040906132C2777903624 @default.
• W3040906132 hasConceptScore W3040906132C2778315978 @default.
• W3040906132 hasConceptScore W3040906132C2778902805 @default.
• W3040906132 hasConceptScore W3040906132C49040817 @default.
• W3040906132 hasConceptScore W3040906132C51141536 @default.
• W3040906132 hasConceptScore W3040906132C520434653 @default.
• W3040906132 hasLocation W30409061321 @default.
• W3040906132 hasOpenAccess W3040906132 @default.
• W3040906132 hasPrimaryLocation W30409061321 @default.
• W3040906132 hasRelatedWork W105045651 @default.
• W3040906132 hasRelatedWork W1578812500 @default.
• W3040906132 hasRelatedWork W1984466331 @default.
• W3040906132 hasRelatedWork W1985941684 @default.
• W3040906132 hasRelatedWork W1990033662 @default.
• W3040906132 hasRelatedWork W2048127487 @default.
• W3040906132 hasRelatedWork W2075092928 @default.
• W3040906132 hasRelatedWork W2243766697 @default.
• W3040906132 hasRelatedWork W2478066395 @default.
• W3040906132 hasRelatedWork W2479161152 @default.
• W3040906132 hasRelatedWork W2601866284 @default.
• W3040906132 hasRelatedWork W2778482995 @default.
• W3040906132 hasRelatedWork W2779299406 @default.
• W3040906132 hasRelatedWork W2789047048 @default.
• W3040906132 hasRelatedWork W2790595912 @default.
• W3040906132 hasRelatedWork W2920191689 @default.
• W3040906132 hasRelatedWork W2991475882 @default.
• W3040906132 hasRelatedWork W2993210822 @default.
• W3040906132 hasRelatedWork W3124138494 @default.
• W3040906132 hasRelatedWork W3200445465 @default.
• W3040906132 isParatext "false" @default.
• W3040906132 isRetracted "false" @default.
• W3040906132 magId "3040906132" @default.
• W3040906132 workType "dissertation" @default.