Ultrafast dynamics of melting and ablation at large laser intensities ab 21.99 € als Taschenbuch: . Aus dem Bereich: Bücher, Wissenschaft, Physik,
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Ultrafast laser ablation of metals in liquids for explosives detection ab 74.9 € als Taschenbuch: . Aus dem Bereich: Bücher, Wissenschaft, Physik,
Ultrafast dynamics of melting and ablation at large laser intensities ab 21.99 EURO
Ultrafast laser ablation of metals in liquids for explosives detection ab 74.9 EURO
Ultrafast dynamics of melting and ablation at large laser intensities ab 16.1 EURO
The phenomena of Coulomb explosion require the consideration of special relativity due to the involvement of high-energy electrons or ions. It is known that laser ablation processes at high laser intensities may lead to the Coulomb explosion, and their released energy is in the regime of kilo to mega eV. In contrast to conventional MD simulations, we adopt the 3D relativistic RMD method to consider the effects of special relativity in the conventional MD simulation for charged particles in strong electromagnetic fields. Furthermore, we develop a Coulomb force scheme, combining with the Lennard-Jones potential, to calculate interactions between charged particles, and adopt a Verlet list scheme to compute the interactions between each particle. It is found that the damage depth does not increase with repeated laser ablation when the pulse frequency is comparable to the duration of the pulse. Furthermore, we report the time evolution of energy propagation in space in the laser ablation process. The temporal-spatial distribution of energy indirectly indicates the temperature evolution on the surface of solid under intense laser illumination
Ultrafast lasers have been widely employed for material micro/nano processing with little thermal damage. Due to the ultra high intensity of ultrashort pulses, nonlinear absorption can be induced at the focus leading to highly localised material ablation or modification. This is now opening up applications ranging from integrated optics, through multi-photon induced refractive index engineering to precision surface micro-structuring. To ensure the non-thermal processing, input pulse energy must be kept around micro-joule level. However, running at kilohertz repetition rate, many ultrafast laser systems can provide milli-joule level output. Therefore, significant energy attenuation causes a great deal of energy loss. With this limitation in mind, a multi-beam ultrafast laser processing, where the milli-joule output is split into many desired diffracted beams, is proposed in this book. The multi-beam patterns are generated by phase modulation through a Spatial Light Modulator (SLM) and can be applied in real time with synchronized scanning methods. The results demonstrate high precision parallel ultrafast laser micro/nano fabrication with greatly increased efficiency and throughput.
Plasmonic Materials In Nano Scales Exhibits Tremendous Properties Due To Their Modified Boundary Conditions. Consequently Nano-materials Exhibit Localized Surface Plasmon Resonances And Propagating Surface Plasmons. Excitation Of These Surface Plasmon Resonance Modes Generates Evanescent Fields In The Very Neighborhood Of Plasmonic Nano-particles/nano-structures.plasmonic Nano-particles/nano-structures Facilitates. The Raman Signatures Enhancements From The Analyte Molecules Adsorbed On Them. Nano Platforms Can Talk To Molecules And Their Discussion Can Be Decoded Through Surface Enhanced Raman Spectroscopy.