Auswahl der wissenschaftlichen Literatur zum Thema „Interactions laser-matière – Propriétés optiques“
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Zeitschriftenartikel zum Thema "Interactions laser-matière – Propriétés optiques"
Pruvost, Laurence, und Thierry Ruchon. „Vortex optiques en interaction avec des atomes“. Reflets de la physique, Nr. 75 (April 2023): 10–16. http://dx.doi.org/10.1051/refdp/202375010.
Der volle Inhalt der QuellePassilly, Bruno, Benjamin Lamboul und Jean-Michel Roche. „Indentation haute fréquence : vers le contrôle non-destructif des structures“. Matériaux & Techniques 105, Nr. 1 (2017): 110. http://dx.doi.org/10.1051/mattech/2017026.
Der volle Inhalt der QuelleDissertationen zum Thema "Interactions laser-matière – Propriétés optiques"
Mansour, Yehia. „Études théorique et expérimentale de la formation des nanoparticules métalliques par ablation laser en milieu liquide. Modélisations des propriétés optiques et thermiques de l'interaction Laser-Nanoparticules“. Electronic Thesis or Diss., Université de Lorraine, 2020. http://www.theses.fr/2020LORR0283.
Der volle Inhalt der QuelleNoble metal nanoparticles (NPs) are the site of a surface plasmon resonance phenomenon resulting from the collective oscillation of their conduction electrons under the effect of an electromagnetic wave. In the case of gold and silver NPs, the resonant frequency is in the visible range, which gives these plasmonic NPs unique optical properties. In particular, the position and intensity of the plasmon resonance depend on their size, shape (aspect ratio) and the index of the host medium. The possible applications require pure samples and mono-dispersed distribution. The chemical synthesis of NPs allows the shape and size of NPs to be controlled. However, it requires the use of stabilizing agents, which lead to surface contamination by synthetic residues. To limit this disadvantage, the physical technique of laser ablation in a liquid medium is a promising alternative, which, however, suffers from a lack of control over the shape and size of the NPs produced. The shape and size of NPs produced by liquid laser ablation (ALML) are closely related to the three essential steps of the process: Target / laser interaction; Mass transport; Laser / NPs interaction suspended in the liquid. In order to understand the mechanisms governing each of these stages, it is necessary to study them separately. In this work, we focused on the mechanisms of interaction between the laser beam and the NPs suspended in the liquid. Depending on the energy density absorbed by the suspended NPs, they undergo fragmentation or remodeling. We then studied the mechanisms behind the phenomenon of fragmentation. The evolution of the shape distribution of NPs during NP fragmentation was studied by developing an original and quantitative technique of in-situ optical spectroscopy. And, the evolution of the volume fraction of NPs during their preparation by ALML by in-situ optical spectroscopy is obtained and analyzed. In parallel with the experimental work, we have developed theoretical models for understanding the mechanisms of formation of metallic nanoparticles by laser ablation in a liquid medium. A modest study on the modeling of optical and thermal properties of the Laser-Nanoparticle interaction is discussed in this thesis. A modified Takami thermal model named MTM was also presented. Its important utility has been demonstrated for mechanisms for the interpretation of the mechanisms of laser-NPs interaction
Ursu, Cristian. „Caractérisation par méthodes optiques et électriques du plasma produit par ablation laser“. Thesis, Lille 1, 2010. http://www.theses.fr/2010LIL10005/document.
Der volle Inhalt der QuelleThe transient plasmas generated by high-fluence laser ablation are complex phenomena involving multiple processes, as optical radiation absorption by the matter, temperature increase and phase transitions generated by the energy transfer, expanding gas hydrodynamics, electrical interactions between the charged particles, or the interaction of the laser radiation with the generated plasma. A most complete understanding of this phenomenon is therefore necessary from the fundamental point of view, but also for characterizing the behavior of high technological potential materials under intense irradiation. We have developed a multi-diagnostic approach, based on optical and electrical techniques: fast ICCD camera imaging, space- and time-resolved optical emission spectroscopy, diode laser absorption spectroscopy, Langmuir probe. These techniques have been used to characterize plasmas generated by nanosecond laser ablation of various samples, from simple Al and Cu metals, to more complicated ceramics, chalcogenide glasses or ferromagnetics. The main results have been the observation of the plasma splitting in two structures and the kinetic and energetic characterization of their constituents. These results present fundamental (development of a fractal hydrodynamic model) and applied (erosion of dielectric walls in space plasma thrusters, pulsed laser deposition of thin films) interest
Brust, Matthias. „Propriétés rhéologiques des globules rouges“. Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00952780.
Der volle Inhalt der QuelleKouriba, Timothé. „Propriétés optiques de microstructures à base de nanofils métalliques“. Thesis, Grenoble, 2012. http://www.theses.fr/2012GRENY084/document.
Der volle Inhalt der QuelleWe used a novel method of laser photochemistry to fabricate 3D microstructures based on metallic nanowires. Nanowires are obtained by laser photoreduction of metallic salt dissolved in a polymer matrix. The chemical reaction is initiated by the two-photon absorption of a photoreductor only at laser focal point. The geometry of microstructures is obtained by moving laser focal point according to suitable trajectories. In this thesis, we have studied the optical properties of of structures based on silver nanowires. A nanowire that stops a plane wave creates a diffracted field which shows parabolic trajectories of maxima and minima intensities. Calculations based on Rayleigh-Sommerfeld diffraction show that this typical figure corresponds to interferences between the incident plane wave and spherical waves generated at the two nanowire edges. When nanowires are arranged into set of parallel nanowires, spaced by a few microns, their diffracted fields generate intensity distributions similar to those of cylindrical refractive microlenses. In that case interference between the incident wave and the diffracted wave leads to a quadrative phase which is the at origin of focalisation. Manufacturing 2D arrays of nanowires allow to achieve very dense arrays of microlenses (10000x10000 DPI, dots per inch), which are impossible to make with refractive microlenses. The possibility to make 3D geometry permit to manipulate maxima and minima intensity trajectories for new diffractive functions at the microscopic scale. For instance manufacturing nanowires shifted in space leads to a new type of optical microdevice that allows the spatial separation of colors red, green and blue at microscopic scale
Attal, Yoann. „Processeurs atomiques utilisant la propriété de creusement spectral : modélisation et application à l’analyse spectrale radiofréquence large bande sur porteuse optique“. Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS161/document.
Der volle Inhalt der QuelleThe Spectral Hole Burning property, found in some rare-earth ion-doped crystals at low temperature is particularly relevant for analogic processing of radiofrequency signals. Indeed, it enables processing functions to be programmed in the crystal’s absorption spectrum.Starting with the first demonstrations of a wideband radiofrequency spectrum analyser, we aim at improving its performances, which requires an accurate modelling of the light-matter interaction and all the perturbations arising from the upgrade in TRL (Technology Readiness Level). Therefore, we have developed a model and extended its validity domain to a broad variety of SHB-based protocols.We applied this model on a particular material, namely a Tm³ ⁺:YAG crystal. After measuring experimentally the relevant intrinsic parameters of this crystal, we applied our model to a protocol which is quite similar to the one of the spectrum analyser we aim at optimizing, namely the engraving of wideband spectral gratings. The comparison of our experimental results to the simulations from our model proved its validity.Finally we applied it to the exact case of the radiofrequency spectrum analyser. With the simulations, we determined how to improve its performances, and particularly increase the dynamic range with realistic experimental parameters
Kouriba, Timothe. „Propriétés optiques de microstructures à base de nanofils métalliques“. Phd thesis, Université de Grenoble, 2012. http://tel.archives-ouvertes.fr/tel-00845919.
Der volle Inhalt der QuelleBaida, Hatim. „Propriétés optiques et spectroscopie non-linéaire de nanoparticules individuelles“. Phd thesis, Université Claude Bernard - Lyon I, 2010. http://tel.archives-ouvertes.fr/tel-00713129.
Der volle Inhalt der QuelleGaudry, Jean-Baptiste. „Etude de deux exemples d'interaction non-linéaire d'une onde laser avec la matière : endommagement laser de diélectriques et propriétés optiques non-linéaires de molécules organométalliques en solution“. Bordeaux 1, 2000. http://www.theses.fr/2000BOR10631.
Der volle Inhalt der QuelleDouti, Dam-Bé Lardja. „Tenue au flux et physique de l'interaction laser/matière dans les couches minces optiques en régime sub-picoseconde“. Thesis, Aix-Marseille, 2015. http://www.theses.fr/2015AIXM4347/document.
Der volle Inhalt der QuelleLaser fluence resistance of optical surfaces is a major challenge for the development of high power and short duration pulse lasers. Studies on laser matter interactions show that the damage initiation is the result of highly nonlinear excitation process such as photoionization, impact ionization and electronic avalanche. In this PhD thesis we focused on the study of the damage and the response of materials after this initiation and their dependence with laser parameters, this in order to better understand the complex mechanisms of damage, identify laws of relevant scales for applications, and enable new optical design with higher laser resistance and lifetimes. A multi parametric experimental testing setup was developed for studying laser resistance of optical components. To collect new data on thin film materials damage dependences, which have been less studied in the literature, different experimental studies have been conducted on dielectrics, in coating or bulk form. The study of the dependency of damage with laser wavelength reveals different ranges characterized by the electronic processes occurring during the interaction. We have considered also the effect of multiple pulse irradiations, with different wavelengths and on coatings realized by different technologies. All these experimental results have been discussed with the help of a numerical simulation model we have developed and presented in this thesis. We have also proposed an original method based on optical phase difference measurement for damage characterization and study. We finished with some experiments on the time resolved microscopy measurements and investigations of damage processes
Beaudier, Alexandre. „Etude de l'interaction laser-matière dans les composants optiques en irradiation multiple, en régime nanoseconde et dans l'UV“. Thesis, Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0334/document.
Der volle Inhalt der QuelleFatigue effects in fused silica have been largely studied in the past years, as this phenomenon is directly linked to the lifetime of high power photonic materials. Indeed, in the UV regime, we observe a decrease of the LIDT (Laser-Induced Damage Threshold) when the number of laser shots increases and this has been attributed for this couple wavelength/material to laser-induced material modifications. Under 266 nm laser irradiation, with nanosecond pulses of constant fluence, we observed that the photoluminescence is modified until damage occurs. Based on this observation, we propose a new representation of the experimental S-on-1 breakdown data which allows predicting the occurrence of material breakdown. This prediction, based on fluorescence signal and not damage statistics (presently widely used) allows consuming fewer sample surface and saving time. To extend the interest of the study to many more applications, we propose an extension of the results at 355 nm. We suppose that damage is caused in our fused silica samples by accumulation of laser-induced modifications under multiple-pulse UV irradiation inducing catastrophic non-linear self-focusing. In order to try to extend the fatigue diagnostic method by fluorescence, we have also realized preliminary tests in well-known non-linear crystals like LBO and KDP