Guiding heat in laser ablation of metals on ultrafast timescales: an adaptive modeling approach on aluminum
| Autor: | Jean-Philippe Colombier, Patrick Combis, Eric Audouard, Razvan Stoian |
|---|---|
| Přispěvatelé: | Laboratoire Hubert Curien [Saint Etienne] (LHC), Institut d'Optique Graduate School (IOGS)-Université Jean Monnet [Saint-Étienne] (UJM)-Centre National de la Recherche Scientifique (CNRS), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Saint Etienne Metropole, ULTRA, ANR-05-CEXC-0015,AdPRO,Techniques de Traitement Laser Ultrarapide Adaptatives pour Applications Photoniques et Optiques(2005), Laboratoire Hubert Curien (LHC), Institut d'Optique Graduate School (IOGS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Physics
Laser ablation Bremsstrahlung General Physics and Astronomy 02 engineering and technology Plasma 021001 nanoscience & nanotechnology Laser 01 natural sciences 7. Clean energy law.invention Critical point (thermodynamics) law Ionization 61.80.Ba 61.82.Bg 42.62.-b 0103 physical sciences [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic Atomic physics 010306 general physics 0210 nano-technology Ultrashort pulse laser applications Excitation adaptive hydrodynamic codes adaptive simulations |
| Zdroj: | New Journal of Physics New Journal of Physics, Institute of Physics: Open Access Journals, 2012, 14, pp.013039. ⟨10.1088/1367-2630/14/1/013039⟩ New Journal of Physics, 2012, 14, pp.013039. ⟨10.1088/1367-2630/14/1/013039⟩ |
| ISSN: | 1367-2630 |
| DOI: | 10.1088/1367-2630/14/1/013039⟩ |
| Popis: | International audience; Using an optimal control hydrodynamic modeling approach and irradiation adaptive time-design, we indicate excitation channels maximizing heat load in laser ablated aluminum at low energy costs. The primary relaxation paths leading to an emerging plasma are particularly affected. With impulsive pulses on ps pedestals, thermodynamic trajectories are preferentially guided in ionized domains where variations in ionization degree occur. This impinges on the gas-transformation mechanisms and triggers a positive bremsstrahlung absorption feedback. The highest temperatures are thus obtained in the expanding ionized matter after a final impulsive excitation, as the electronic energy relaxes recombinatively. The drive relies on transitions to weakly coupled front plasmas at the critical optical density, favoring energy confinement with low mechanical work. Alternatively, robust collisional heating occurs in denser regions above the critical point. This impacts the nature, the excitation degree and the energy content of the ablated matter. Adaptive modeling can therefore provide optimal strategies with information on physical variables not readily accessible and, as experimentally confirmed, databases for pulse shapes with interest in remote spectroscopy, laser-induced matter transfer, laser material processing and development of secondary sources. |
| Databáze: | OpenAIRE |
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