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Dissertations / Theses on the topic 'Laser micro'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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1

Sierra, Hernández Wilfrido 1975. "Micro laser personal projector." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/29704.

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Thesis (S.M.)--Massachusetts Institute of Technology, School of Architecture and Planning, Program in Media Arts and Sciences, 2003.<br>Includes bibliographical references (p. 79-81).<br>The proposed research is a study of the technology and applications of personal projectors, small and inexpensive video projection devices intended for use in battery-powered hand-held or wearable products. This research will describe some ways of steering laser beams in one dimension to produce up to a one-meter wide screen. A one dimensional micro laser array will be used to avoid the effect of flickering wh
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2

Wu, Songping. "Femtosecond laser micro-structuring of silicon wafer in water confinement." Diss., Rolla, Mo. : Missouri University of Science and Technology, 2008. http://scholarsmine.mst.edu/thesis/pdf/Wu_09007dcc80493fda.pdf.

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Thesis (M.S.)--Missouri University of Science and Technology, 2008.<br>Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed April 3, 2008) Includes bibliographical references (p. 66-74).
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3

Kumar, Mukund. "Laser assisted micro milling of hard materials." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41213.

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This thesis presents an investigation of novel laser assisted micromachining processes that addresses the limitations of micromachining of hard-to-machine materials. Two different laser assisted approaches are used to machine hard metals and high strength ceramics. For hard metals, the basic approach involves localized thermal softening of the workpiece material by focusing a solid-state continuous wave near infra-red laser beam in front of the micro milling tool (end mills of 0.1 to 0.5 mm diameter). By suitably controlling the laser power, spot size and scan speed, it is possible to produce
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4

Mendez, Fernandez de Cordoba Enrique. "Laser micro-polishing of silica optics." Thesis, Heriot-Watt University, 2007. http://hdl.handle.net/10399/80.

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5

Lorenz, Norbert. "Laser-based packaging of micro-devices." Thesis, Heriot-Watt University, 2011. http://hdl.handle.net/10399/2491.

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In this PhD thesis the development of laser-based processes for packaging applications in microsystems technologies is investigated. Packaging is one of the major challenges in the fabrication of micro-electro-mechanical systems (MEMS) and other micro-devices. A range of bonding processes have become established in industry, however, in many or even most cases heating of the entire package to the bonding temperature is required to effect efficient and reliable bonding. The high process temperatures of up to 1100°C involved severely limit the application areas of these techniques for packaging
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6

Powell, Rock Allen. "On-line depth measurement of micro-scale laser drilled holes." Diss., Rolla, Mo. : Missouri University of Science and Technology, 2009. http://scholarsmine.mst.edu/thesis/pdf/Powell_09007dcc806b6dfc.pdf.

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Thesis (M.S.)--Missouri University of Science and Technology, 2009.<br>Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed August 14, 2009) Includes bibliographical references (p. 16-17).
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7

Penchev, Pavel Nedyalkov. "Reconfigurable laser micro-processing systems : development of generic system-level tools for implementing modular laser micro-manufactoring platforms." Thesis, University of Birmingham, 2016. http://etheses.bham.ac.uk//id/eprint/6709/.

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Laser micro-machining (LMM) is an attractive manufacturing technology for the fabrication of a wide range of micro-components due to its intrinsic processing attributes. In addition, LMM can be integrated in hybrid manufacturing platforms and thus to combine LMM with other complementary processes for the cost effective fabrication of a broader range of miniaturised products. Nevertheless, the broader industrial uptake of LMM is still to come due to system-level issues in designing and implementing LMM systems. In this context, the research reported in this thesis is aimed at improving the syst
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8

Choi, Hae Woon. "Femtosecond laser material processing for micro-/nano-scale fabrication and biomedical applications." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1184883900.

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9

Tsopanos, Sozon. "Micro Heat Exchangers by Selective Laser Melting." Thesis, University of Liverpool, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.507633.

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Selective Laser Melting (SLM), a layer-based Solid Freeform Fabrication (SFF) process, was used to fabricate micro cross-flow heat exchangers from 316L stainless steel, bronze (Cu 90%, Sn 10%) and Inconel 718 powder. Their mechanical and thermal properties were determined using solid blocks of SLM material prior to the fabrication of the micro cross flow heat exchangers. Initially the process parameters for the fabrication of high density (>97%) parts for the different materials were defined. The mechanical and thermal properties of SLM parts were then measured. The tensile test results exhibi
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10

Sun, Bangshan. "Direct laser micro-fabrication by adaptive optics." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:dc127fab-1ad9-4f23-913e-9ba6438e8934.

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Ultrafast lasers are widely used for the precise three-dimensional micro-fabrication inside transparent materials. The resolution of fabricated features depends upon the size of the focal spot, and the process efficiency depends upon the generation of short pulses at the focus. The performance is detrimentally affected by the presence of phase aberrations, which can be introduced by the optics of the system or by refraction at the surface of material. Efficiency can also be affected by other forms of aberration that are related to the ultra-short pulses, such as pulse front distortion or mater
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11

Campos, Zatarain Alberto. "Diode laser modules based on laser-machined, multi-layer ceramic substrates with integrated water cooling and micro-optics." Thesis, Heriot-Watt University, 2012. http://hdl.handle.net/10399/2595.

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This thesis presents a study on the use of low temperature co-fired ceramic (LTCC) material as a new platform for the packaging of multiple broad area single emitter diode lasers. This will address the recent trend in the laser industry of combining multiple laser diodes in a common package to reach the beam brightness and power required for pumping fibre lasers and for direct-diode industrial applications, such as welding, cutting, and etching. Packages based on multiple single emitters offer advantages over those derived from monolithic diode bars such as higher brightness, negligible therma
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12

Kuang, Zheng. "Parallel diffractive multi-beam ultrafast laser micro-processing." Thesis, University of Liverpool, 2011. http://livrepository.liverpool.ac.uk/1333/.

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During the last decade, ultrashort pulse lasers have been employed for high precision surface micro-structuring of materials such as metals, semiconductors and dielectrics with little thermal damage. Due to the ultra high intensity of focussed femtosecond pulses (I > 1012W/cm2), 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 modification for silicon scribing and solar cell fabrication.
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13

Li, Qingfeng. "Double-pulse laser-induced forward transfer." Thesis, Aix-Marseille, 2019. http://www.theses.fr/2019AIXM0033/document.

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Pour résoudre la limitation inhérente au procédé d’impression laser LIFT, une approche utilisant une double impulsion (DP-LIFT) a été développée au cours de cette thèse. Dans ce processus, une irradiation laser de durée de quelques dizaines de microsecondes crée un bain de métal en fusion et une seconde impulsion ultra-brève induit le mouvement du fluide, la formation d’un jet ou d’une goutte et le transfert du métal liquide. Cette thèse présente une étude expérimentale détaillée sur le processus DP-LIFT. L'influence des paramètres des deux irradiations laser a été étudiée en s’appyuant sur un
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14

Biasotto, Cleber. "Processos alternativos para micro e nanotecnologia." [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/260856.

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Orientador: Jose Alexandre Diniz<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação<br>Made available in DSpace on 2018-08-21T20:16:28Z (GMT). No. of bitstreams: 1 Biasotto_Cleber_D.pdf: 3795677 bytes, checksum: e4e2355f73ec8fb2ad7677cdf17f5daf (MD5) Previous issue date: 2012<br>Resumo: Atualmente para atender à necessidade de fabricação dos sensores, dispositivos eletrônicos e circuitos integrados com dimensões micro e nanométricas, novos processo de custos e de thermal budgets reduzidos são necessários. Este trabalho apresenta o desenv
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15

Hsu, Shu-Ting. "High performance micro scanners for miniature laser projection displays." Dresden TUDpress, 2009. http://d-nb.info/996064125/04.

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16

TARAZONA, SCAGLIA VERONIQUE. "Etude et realisation d'elements de micro-optique pour la stabilisation de micro-cavites laser." Paris 11, 1996. http://www.theses.fr/1996PA112138.

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Les microlasers solides a cavites a faces planes et paralleles presentent des seuils assez eleves. En effet les cavites de ces lasers sont stabilisees uniquement par des effets thermiques dans le cristal, induits par le faisceau de pompe. Le but de cette these etait de realiser des micro-miroirs spheriques sur l'une des faces du microlaser, afin que la cavite soit geometriquement stable en l'absence d'echauffement du a la pompe. Nous avons ainsi etudie deux methodes de fabrication collective de microlentilles, methodes issues de technologies utilisees en micro-electronique. Des preformes spher
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17

Deceuster, Andrew Isaac. "Investigation of Joining Micro-Foil Materials with Selective Laser Sintering and Laser Powder Deposition." DigitalCommons@USU, 2009. https://digitalcommons.usu.edu/etd/434.

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Continuous and pulse selective laser sintering and laser powder deposition were used to find a solution to the manufacturing of micro-foil lattice structured components. A full factorial test matrix was used for each process to determine the processes capability to produce continuous tracks for joining the micro-foil materials. The samples were evaluated for dimensional profiles, distortion, and cycle times, to develop selection criteria for implementation of the processes into industry. The selective laser sintering processes were able to join the micro-foil materials into lattice structures
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18

Pruneau, Godmaire Xavier. "Micro-usinage de fibres optiques avec un laser CO2." Thesis, Université Laval, 2011. http://www.theses.ulaval.ca/2011/26911/26911.pdf.

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19

Hélie, David. "Micro-usinage de lamelles de verre au laser femtoseconde." Thesis, Université Laval, 2011. http://www.theses.ulaval.ca/2011/28184/28184.pdf.

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20

Otanocha, Omonigho. "Laser surface micro/nano patterning for improving aerodynamic performance." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/laser-surface-micronano-patterning-for-improving-aerodynamic-performance(f78b8df4-fa5d-4dd8-9d93-88e1068c5857).html.

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The use of ultrafast lasers in material surface engineering has gained pre-eminence in recent years. This is due to optimal utility arising from their versatility, better process control, repeatability and high precision fabrication, without need for post processing. Reported in this thesis are experimental results on the use of picosecond laser to produce micro-patterns on cyclone components and their effects on flow characteristics. Results show that micro- dimples achieved reduction in dust accumulation within a multi-cyclone system considered, up to 78%. These micro-dimples when applied on
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21

Hivin, Quentin. "Micro-structuration laser pour le packaging électro-optique avancé." Thesis, Lille 1, 2019. http://www.theses.fr/2019LIL1I031/document.

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Le développement de l’internet des objets et des services de vidéo en temps réel (streaming) a conduit à une augmentation continue du trafic des données au sein des data-centers. Celui-ci devrait être multiplié par trois entre 2012 et 2020 pour atteindre 15.3 zettaoctets/an. Cette évolution appelle parallèlement à un accroissement des performances des composants télécom en transmission optique monomode dont le standard s’établit aujourd’hui à 100-200 Gbits/s pour évoluer vers 400-800 Gbits/s dans un futur proche. Bien que les cœurs de technologies semiconducteurs soient aujourd’hui disponibles
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22

Pruneau, Godmaire Xavier. "Micro-usinage de fibres optiques avec un laser CO₂." Master's thesis, Université Laval, 2011. http://hdl.handle.net/20.500.11794/23028.

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Le mandat initial de ce projet de maîtrise visait l'élaboration de procédures de microusinage de fibres optiques à l'aide d'un laser C0₂ puisé. L'efficacité d'usinage d'une fibre optique a d'abord été mise en évidence via l'étude théorique des phénomènes engendrés par l'absorption du rayonnement infrarouge. Suite à une caractérisation spatiale et temporelle du système laser, des méthodes sans contact de dégainage, de clivage et de polissage ont été mises sur pied en exploitant les propriétés uniques du rayonnement à 10,6/xm. Des fibres optiques de silice, de ZBLAN et de verre de chalcogénure o
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23

Griffiths, Jonathan. "Modelling of laser forming at macro and micro scales." Thesis, University of Liverpool, 2012. http://livrepository.liverpool.ac.uk/9633/.

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Laser forming (LF) offers industry the promise of controlled shaping of metallic and nonmetallic components in prototyping, correction of design shape or distortion and precision adjustment applications. In order to fulfil this promise in a manufacturing environment the process must have a high degree of controllability, which can be achieved through a better understanding of its underlying mechanisms. The work presented in this thesis is primarily concerned with the use of modelling of the LF process at macro and micro scales as a means of process development. At the macro scale, finite eleme
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24

Allegre, Olivier. "Advanced polarization control for optimizing ultrafast laser micro-processing." Thesis, University of Liverpool, 2013. http://livrepository.liverpool.ac.uk/11793/.

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The ability to control and manipulate the state of polarization of a laser beam is becoming an increasingly desirable feature in a number of industrial laser micro-processing applications. Being able to control polarization would enable the improvement of the efficiency and quality of processes such as the drilling of holes for fuel-injection nozzles, the processing of silicon wafers or the machining of medical stent devices. This thesis presents novel, liquid-crystal-based optical setups for controlling the polarization of ultrafast laser beams, and demonstrates how such optical setups can be
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25

Alshehri, Ali. "Micro and Nanostructuring of Polymers by Femtosecond Laser Pulses." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/35356.

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Micro/Nanostructuring of polymers by femtosecond pulses is of extreme importance because it drives applications in photonics and biomedicine. A femtosecond pulse, with an intensity of ∼ 10^13 W/cm^2, is capable of causing an optical breakdown and inducing permanent modification in the material. With such high intensity, and considering the fact that polymers possess high band gaps, the interaction nature is completely nonlinear, and the material can be modified locally on the surface and in bulk. The irradiated regions exhibit fluorescence, and they display new wetting properties as a conseque
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26

Bruneel, David. "Ablation laser femtoseconde pour le contrôle de la micro et nano structuration." Phd thesis, Université Jean Monnet - Saint-Etienne, 2010. http://tel.archives-ouvertes.fr/tel-00675144.

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Le développement actuel de la technologie induit une constante nécessité d'obtenir des tailles de plus en plus petites pouvant descendre jusqu'à des dimensions micrométriques et sub -micrométriques. L'ablation laser, qui a le grand avantage d'un enlèvement de matière très précis, est un candidat prometteur. Dans cette thèse on démontre la faisabilité de tirer avantage des impulsions laser femtosecondes avec la matière pour la micro et nano structuration, et ceci en ayant développé une machine compacte de grande précision et flexibilité. Une approche théorique comparant les régimes d'interactio
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27

Matras, Guillaume. "Développement d'un amplificateur laser titane Saphir 10 kHz : application au micro-usage." Saint-Etienne, 2008. http://www.theses.fr/2008STET4008.

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Ce mémoire présente les résultats de travaux de thèse menés dans le cadre d'une convention CIFRE en collaboration avec la laboratoire Hubert Curien à Saint-Etienne et la société Thales Laser à Orsay. L'objectif principal de ces travaux était la réalisation d'un système amplificateur femtoseconde à base de cristal de saphir dopé titane cadencé à un taux de répétition de 10 kHz répondant au besoin industriel dans le domaine du micro-usinage laser. Des études préalables, à la fois théoriques et expérimentales, ont permis de caractériser avec précision la lentille thermique induite dans un cristal
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28

Hélie, David. "Développement de procédés de micro-usinage de matériaux optiques au laser femtoseconde." Doctoral thesis, Université Laval, 2014. http://hdl.handle.net/20.500.11794/25446.

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Lors des travaux de recherche décrits dans cette thèse, un laser à impulsions femtosecondes (fs) est employé comme outil chirurgical pour joindre/souder les matériaux optiques. Lorsque ces impulsions traversent un premier matériau transparent (typiquement un verre) et sont focalisées à l’interface entre celui-ci et un deuxième matériau, l’ionisation non linéaire de la matière produit une soudure localisée à la région irradiée sans affecter thermiquement les environs. Le deuxième matériau peut être de composition soit identique ou différente du premier, soit transparent ou opaque. Les surfaces
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29

Verit, Isabel. "Micro-Usinage par laser femtoseconde : Fabrication d'une microfibre glomérulaire perfusée." Thesis, Bordeaux, 2020. http://www.theses.fr/2020BORD0159.

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Le nombre de patients en attente sur la liste de transplantation d'organe est croissant dû notamment à une augmentation de la durée de vie. L'ingénierie tissulaire, dans une optique de remplacement d'organes pourrait être une alternative à ce problème de pénurie d'organes. Cependant, la création d'un organe entier par ingénierie tissulaire est limitée par la complexité de son organisation et la vascularisation des tissus créés. La vascularisation permet en effet d’apporter l'oxygène et les nutriments nécessaires aux cellules et d'éliminer les déchets qu'elles génèrent. Sans vascularisation, le
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30

SILVA, Renato Barbosa da. "Materiais Micro e Nanoestruturados para Aplicações Fotônicas." Universidade Federal de Pernambuco, 2015. https://repositorio.ufpe.br/handle/123456789/17328.

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Submitted by Irene Nascimento (irene.kessia@ufpe.br) on 2016-07-11T19:05:22Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) TESE Renato Barbosa da Silva.pdf: 6315157 bytes, checksum: 2b3ac093113d303d28b902d531315c52 (MD5)<br>Made available in DSpace on 2016-07-11T19:05:22Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) TESE Renato Barbosa da Silva.pdf: 6315157 bytes, checksum: 2b3ac093113d303d28b902d531315c52 (MD5) Previous issue date: 2015-08-27<br>CAPES<br>Diferentes tipos de materiais fo
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31

Wagner, Frank. "Interaction laser matière à forts flux : Micro-usinage et endommagement laser dans le domaine nanoseconde." Habilitation à diriger des recherches, Aix-Marseille Université, 2012. http://tel.archives-ouvertes.fr/tel-00769459.

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Ce document décrit mon cheminement professionnel, en détaillant principalement mes activités de recherche successives qui, par delà les changements de pays et de thématiques précises, ont gardé le dénominateur commun " d'interaction lumière-matière ". Ce document débute par un curriculum vitae (section 1) qui résume les différentes étapes de mon cheminement professionnel (" Diplomarbeit " au Laser-Laboratorium Göttingen, Doctorat à l'Ecole Polytechnique Fédérale de Lausanne, Recherche dans une PME à Lausanne, Maître de Conférence à l'Université d'Aix-Marseille / Institut Fresnel) en précisant
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32

Li, Kun. "Laser micro-processing of silicon using nanosecond pulse shaped fibre laser at 1 μm wavelength". Thesis, University of Cambridge, 2012. https://www.repository.cam.ac.uk/handle/1810/245313.

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Processing of Si in the semiconductor and solar cell industry has been dominated by the Diode Pumped Solid State (DPSS) Ultraviolet (UV) laser. Recent advances in laser source technology have produced fibre lasers with Master Oscillator Power Amplifier (MOPA) architectures that offer high repetition rates, high operational efficiencies, and pulse modulation controls exceeding those of typical Q-switched DPSS lasers. The aim of this research is to investigate 1 μm fibre laser machining of Si with a view to identifying the influential laser parameters for optimum processing of high quality, high
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33

Ten, Jyi Sheuan. "High speed mask-less laser-controlled precision micro-additive manufacture." Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/285409.

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A rapid, mask-less deposition technique for writing metal tracks has been developed. The technique was based on laser-induced chemical vapour deposition. The novelty in the technique was the usage of pulsed ultrafast lasers instead of continuous wave lasers in pyrolytic dissociation of the chemical precursor. The motivation of the study was that (1) ultrafast laser pulses have smaller heat affected zones thus the deposition resolution would be higher, (2) the ultrashort pulses are absorbed in most materials (including those transparent to the continuous wave light at the same wavelength) thus
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34

Danion, Gwennaël. "Synthétiseur micro-onde à térahertz ultra-stable." Thesis, Rennes 1, 2015. http://www.theses.fr/2015REN1S014/document.

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Le but de cette thèse est la synthèse optique d'ondes millimétriques et submillimétriques avec un très bas bruit de phase. La première partie concerne la réalisation d'un laser biaxe bifréquence dont chacune des deux fréquences est accordable indépendamment et continûment sur 1 THz. Ce laser est caractérisé en bruit d'amplitude et de phase. Nous avons mis en évidence un facteur de couplage entre les fluctuations de puissance de la diode de pompe et le bruit de phase du laser. La deuxième partie concerne le développement d'un système amplificateur qui se compose d'un amplificateur EDFA et d'un
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35

Mota, Alessandro Damiani. "Sistema eletrônico de controle para laser amarelo de aplicação oftalmológica com regime de operação contínuo e micro-pulsado." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/18/18152/tde-26042012-100723/.

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Mais recentemente foi proposta uma nova técnica para tratamento de doenças relacionadas à retina humana, utilizando descargas laser na retina com seqüência de pulsos da ordem de 200 \'mü\'s, em substituição ao tratamento convencional que utiliza pulsos longos da ordem de 300 ms. A principal vantagem da nova técnica é a preservação (sem morte celular) do tecido exposto ao laser. Esse trabalho apresenta os mecanismos adotados para o desenvolvimento de um sistema eletrônico de controle de uma cavidade laser em 586 nm, para uso oftalmológico, que objetiva atender o protocolo exigido por essa técni
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36

Pence, Chelsey Nicole. "Micro-bending and patterning via high energy pulse laser peening." Thesis, University of Iowa, 2014. https://ir.uiowa.edu/etd/4714.

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High energy pulse laser peening (HEPLP) is a manufacturing process, in which a strong shock wave is produced and induces high pressures on the surface of the target material. Generally, this process is used to improve material properties such as the hardness and fatigue life. First a 2D multi-physics model for the process was investigated, which simulates the pressure induced on the surface of the target material. The model can be coupled with commercial finite element software, such as ABAQUS, to more accurately simulate the HEPLP process to find stresses and deformations on the surface. Next
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37

Dobrev, Todor. "Investigation of laser milling process characteristics for micro tooling applications." Thesis, Cardiff University, 2005. http://orca.cf.ac.uk/56007/.

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Laser milling is a new application that is challenging for the power contained in the laser light. Due to its small unit of material removal, accuracy and repeatability, laser milling has found an application area in micro manufacturing, especially the manufacturing of microtools. There is a number of micro manufacturing and replication processes on the market at present. Their needs raise the requirements that have to be met by the microtool manufacturing process. Initially, the requirements of micro manufacturing processes, such as micro-injection moulding and hot-embossing, are identified a
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38

Guo, Wei. "Laser Micro/Nano Scale Surface Patterning by Particle Lens Array." Thesis, University of Manchester, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.508543.

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39

Gill, Matthew. "Micro and nano structuring of metals using femtosecond laser ablation." Thesis, University of Liverpool, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.434009.

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40

Desbiens, Jean-Philippe. "Micro-usinage au laser excimère pour le prototypage de MEMS." [S.l. : s.n.], 2006.

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41

Ouyang, J. "Tailored optical vector fields for ultrashort-pulse laser micro-processing." Thesis, University of Liverpool, 2016. http://livrepository.liverpool.ac.uk/3001726/.

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In this thesis, a Spatial Light Modulator (SLM) and a nano-structured S-waveplate were integrated with a picosecond laser system and employed to generate complex vector optical fields. Precise tailoring of optical vector beams is demonstrated, shaping their focal electric fields. Using novel optical setups, radial and azimuthal polarizations with and without vortex phase wavefront were created, producing complex laser micro patterning on a polished metal surface. Imprinting Laser Induced Periodic Surface Structures(LIPSS) elucidates the detailed vector fields around the focal region, which sho
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Lasagni, Andrés F., Tim Kunze, Matthias Bieda, et al. "Large area micro-/nano-structuring using direct laser interference patterning." SPIE, 2016. https://tud.qucosa.de/id/qucosa%3A34803.

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Smart surfaces are a source of innovation in the 21^st Century. Potential applications can be found in a wide range of fields where improved optical, mechanical or biological properties can enhance the functions of products. In the last years, a method called Direct LaserInterference Patterning (DLIP) has demonstrated to be capable of fabricating a wide range of periodic surface patterns even with resolution at the nanometer and sub-micrometer scales. This article describes recent advances of the DLIP method to process 2D and 3D parts. Firstly, the possibility to fabricate periodic arrays on m
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Itoh, Sho. "Studies on laser processing of glasses for micro- and nanostructures." 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/217174.

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Desbiens, Jean-Philippe. "Micro-usinage au laser excimère pour le prototypage de MEMS." Mémoire, Université de Sherbrooke, 2006. http://savoirs.usherbrooke.ca/handle/11143/1280.

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De plus en plus de dispositifs miniatures appelés MEMS (Micro Electro Mechanical systems) sont développés au Canada. Parmi ces dispositifs, on retrouve notamment des capteurs (pression, accélération, température, etc.), des micro-actionneurs (électrostatiques, piézoélectriques, etc.) et une panoplie d'autres applications possibles de la mécanique et de l'électronique à petite échelle (ex. micro-laboratoire, microturbine). Les MEMS sont généralement fabriqués par des procédés de microélectronique en salle blanche (lithographie, gravure humide, DRIE, etc.). Ces méthodes ne permettent de réaliser
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Farhana, Baset. "Micro/nano-scale Manipulation of Material Properties." Thesis, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/31862.

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Femtosecond laser interaction with dielectrics has unique characteristics for micromachining, notably non-thermal interaction with materials, precision and flexibility. The nature of this interaction is highly nonlinear due to multiphoton ionization, so the laser energy can be nonlinearly absorbed by the material, leading to permanent change in the material properties in a localized region of Mu-m3. This dissertation demonstrated the potential of these nonlinear interactions induced changes (index modification and ablation for machining) in the dielectrics and explored several practical appli
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Nshimirimana, Josélyne. "Caractéristiques d’antennes térahertz photoconductrices de type micro-ruban coplanaire." Mémoire, Université de Sherbrooke, 2016. http://hdl.handle.net/11143/9801.

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Ce projet de recherche a permis d'étudier l'émission d'un rayonnement térahertz (THz) par des antennes photoconductrices (PC) émettrices de type micro-ruban coplanaire. Ces antennes sont fabriquées sur substrats d'arséniure de gallium semi-isolant (GaAs-SI) ou sur ce même substrat ayant subit un traitement d'implantation ionique aux protons suivi d'un recuit thermique (GaAs:H). L'influence de ce procédé de fabrication sur les propriétés du matériau photoconducteur et sur les caractéristiques de l'antenne émettrice a été étudiée. Des mesures de photoconductivité résolue en temps effectuées sur
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Dumont, Paul. "Laser à semiconducteur pompé optiquement bifréquence pour les horloges à atomiques à piégeage cohérent d'atomes de Césium." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLO012/document.

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Les horloges atomiques à piégeage cohérent de population (CPT) constituent aujourd'hui un outil idéal pour la réalisation de références de fréquence stables, compactes et à faible consommation énergétique. Dans le cas des horloges à base de césium, elles nécessitent l'utilisation d'un champ laser bifréquence à 895 nm (raie D1) ou à 852 nm (raie D2) et dont la différence entre les fréquences optiques est égale à 9,19 GHz, soit l'écart entre les niveaux hyperfins du niveau fondamental. Nous proposons une nouvelle solution pour générer ce champ laser, à partir d'un unique laser à semiconducteur p
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Catros, Sylvain. "Etude de la Micro-Impression d'Eléments Biologiques par Laser pour l'Ingénierie du Tissu Osseux." Thesis, Bordeaux 1, 2010. http://www.theses.fr/2010BOR14108/document.

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L'ingénierie tissulaire osseuse est un domaine multidisciplinaire qui vise à produire des substituts tissulaires pour la médecine régénératrice. Ce travail visait à produire des substituts osseux structurés tridimensionnels grâce à un système d'impression d'éléments biologiques par laser développé au laboratoire Inserm U577 (Projet LASIT: LASer pour L'Ingénierie Tissulaire). Les étapes de la thèse ont consisté tout d'abord à préparer des matériaux adaptés à l'impression par laser et à les caractériser au niveau physico-chimique et biologique. Il s'agissait d'hydroxyapatite nano-cristalline, de
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Gülçür, Mert, J.-M. Romano, P. Penchev, et al. "A cost-effective process chain for thermoplastic microneedle manufacture combining laser micro-machining and micro-injection moulding." Elsevier, 2021. http://hdl.handle.net/10454/18446.

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Yes<br>High-throughput manufacturing of transdermal microneedle arrays poses a significant challenge due to the high precision and number of features that need to be produced and the requirement of multi-step processing methods for achieving challenging micro-features. To address this challenge, we report a flexible and cost-effective process chain for transdermal microneedle array manufacture that includes mould production using laser machining and replication of thermoplastic microneedles via micro-injection moulding (micromoulding). The process chain also incorporates an in-line manufacturi
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Ma, Hongfeng. "Étude numérique de la micro et nano structuration laser de matériaux poreux nanocomposites." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSES001.

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Cette thèse porte sur les simulations numériques de l’interaction laser avec des matériaux poreux. Une possibilité de traitement bien contrôlé est particulièrement importante pour la microstructuration laser du verre poreux et le nano-usinage de matériaux poreux semiconducteurs en présence de nanoparticules métalliques. La modélisation auto-cohérente se concentre donc sur une étude détaillée des processus impliqués. En particulier, pour comprendre les structures des micro-vides périodiques produits à l’intérieur du verre poreux par des impulsions laser femtoseconde, une analyse thermodynamique
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