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Rozprawy doktorskie na temat „Laser processing”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 25 lipca 2025

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1

O'Neill, William. "Mixed wavelength laser processing." Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/46479.

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2

Patz, Timothy Matthew. "Laser Processing of Biological Materials." Thesis, Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7451.

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I have explored the use of the matrix assisted pulsed laser evaporation (MAPLE) and MAPLE direct write (MDW) to create thin films of biological materials. MAPLE is a novel physical vapor deposition technique used to deposit thin films of organic materials. The MAPLE process involves the laser desorption of a frozen dilute solution (1-5%) containing the material to be deposited. A focused laser pulse (~200 mJ/cm2) impacts the frozen target, which causes the solvent to preferentially absorb the laser energy and evaporate. The collective action of the evaporated solvent desorbs the polymeric s

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3

Beck, Rainer Johannes. "Adaptive optics for laser processing." Thesis, Heriot-Watt University, 2011. http://hdl.handle.net/10399/2462.

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The overall aim of the work presented in this thesis is to develop an adaptive optics (AO) technique for application to laser-based manufacturing processes. The Gaussian beam shape typically coming from a laser is not always ideal for laser machining. Wavefront modulators, such as deformable mirrors (DM) and liquid crystal spatial light modulators (SLM), enable the generation of a variety of beam shapes and furthermore offer the ability to alter the beam shape during the actual process. The benefits of modifying the Gaussian beam shape by means of a deformable mirror towards a square flat top

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4

Lutey, Adrian Hugh Alexander <1986&gt. "High-Speed Laser Processing of Thin Single and Multi-Layer Films." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5741/1/Lutey_Adrian_tesi.pdf.

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Theoretical models are developed for the continuous-wave and pulsed laser incision and cut of thin single and multi-layer films. A one-dimensional steady-state model establishes the theoretical foundations of the problem by combining a power-balance integral with heat flow in the direction of laser motion. In this approach, classical modelling methods for laser processing are extended by introducing multi-layer optical absorption and thermal properties. The calculation domain is consequently divided in correspondence with the progressive removal of individual layers. A second, time-domain nume

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5

Lutey, Adrian Hugh Alexander <1986&gt. "High-Speed Laser Processing of Thin Single and Multi-Layer Films." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5741/.

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Theoretical models are developed for the continuous-wave and pulsed laser incision and cut of thin single and multi-layer films. A one-dimensional steady-state model establishes the theoretical foundations of the problem by combining a power-balance integral with heat flow in the direction of laser motion. In this approach, classical modelling methods for laser processing are extended by introducing multi-layer optical absorption and thermal properties. The calculation domain is consequently divided in correspondence with the progressive removal of individual layers. A second, time-domain nume

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6

Gulia, Kiran. "Pulsed laser processing of dielectric materials." Thesis, Heriot-Watt University, 2007. http://hdl.handle.net/10399/2035.

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The thesis investigates the wavelength dependent laser ablp..~ion in dielectric materials used for the fabrication ofhigh density Printed Circuit Boards (PCBs) in the electronics industry. Here the market for consumer and industrial products of ever-rising complexity has led to a demand for increased miniaturisation and low costs of multilevel printed circuit boards (PCBs) interconnected by microvias, which electrically connect the various circuit layers. Laser machining offers a potential solution to this need. The main objective of the research is to investigate the wavelength-dependence of

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7

Holmberg, Patrik. "Laser processing of Silica based glass." Doctoral thesis, KTH, Laserfysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-173929.

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The main topic of this thesis work is photosensitivity and photo-structuring of optical fibers and bulk glass. Although research in the field of photosensitivity in glass and optical fibers has been ongoing for more than three decades, the underlying mechanisms are still not well understood. The objective was to gain a better understanding of the photo-response by studying photosensitivity from a thermodynamic perspective, as opposed to established research focusing on point defects and structural changes, and strain and stress in optical fibers. Optical fibers was mainly used for experimental

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8

Zhang, Jingyu. "Polarization sensitive ultrafast laser material processing." Thesis, University of Southampton, 2016. https://eprints.soton.ac.uk/419400/.

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In this thesis, I will concentrate on ultrafast laser interactions with various materials such as fused silica, crystalline silicon, amorphous silicon and nonlinear crystal. The first polarization sensitive ultrafast laser material interaction to be illustrated was second harmonic generation in lithium niobate by tightly focused cylindrical vector beams. The generated second harmonic patterns were experimentally demonstrated and theoretically explained. Existence of the longitudinal component of the fundamental light field was proven. The same beams were used for modifying fused silica glass.

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9

Collins, Gustina B. "Laser Processing of Polyimide on Copper." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/32559.

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While work using a laser for processing a polymer dielectric is currently being studied, the purpose of this thesis is to present an effective and economical approach using laboratory equipment that is most commonly used and available for the processing of materials including polymers and metals. The use of a laser allows for a more cost effective and flexible method for processing polyimide over other wet and dry processes. This thesis represents the results of research on the laser processing of polyimide on copper. The research examines the effect of the laser processing parameters usin

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10

Franzel, Louis. "Modification of Nanostructures via Laser Processing." VCU Scholars Compass, 2013. http://scholarscompass.vcu.edu/etd/3024.

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Modification of nanostructures via laser processing is of great interest for a wide range of applications such as aerospace and the storage of nuclear waste. The primary goal of this dissertation is to improve the understanding of nanostructures through two primary routes: the modification of aerogels and pulsed laser ablation in ethanol. A new class of materials, patterned aerogels, was fabricated by photopolymerizing selected regions of homogeneous aerogel monoliths using visible light. The characterization and fabrication of functionally graded, cellular and compositionally anisotropic aer

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11

Harlan, Nicole Renee. "Titanium processing using selective laser sintering /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.

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12

Musaev, Omar Wróbel Jerzy. "UV laser assisted processing of InP at different ambient conditions with variable number of pulses and fluences." Diss., UMK access, 2006.

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Thesis (Ph. D.)--Dept. of Physics and School of Computing and Engineering. University of Missouri--Kansas City, 2006.<br>"A dissertation in physics and telecommunications networking." Advisor: Jerzy Wrobel. Typescript. Vita. Title from "catalog record" of the print edition Description based on contents viewed Nov. 1, 2007. Includes bibliographical references (leaves 185-190). Online version of the print edition.

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13

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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14

Stoian, Razvan. "Adaptive techniques for ultrafast laser material processing." Habilitation à diriger des recherches, Université Jean Monnet - Saint-Etienne, 2008. http://tel.archives-ouvertes.fr/tel-00352662.

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Le besoin d'une très grande précision lors du traitement des matériaux par laser a fortement encouragé le développement des études de l'effet des impulsions ultra brèves pour la structuration des matériaux à une échelle micro et nano métrique. Une diffusion d'énergie minimale et une forte non linéarité de l'interaction permet un important confinement énergétique à des échelles les plus petites possibles. La possibilité d'introduire des changements de phases rapides et même de créer de nouveaux états de matière ayant des propriétés optimisées et des fonctions améliorées donne aux impulsions ult

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15

Arildsson, Mikael. "Origin and processing of laser doppler spectra /." Linköping : Univ, 2000. http://www.bibl.liu.se/liupubl/disp/disp2000/tek644s.pdf.

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16

James, Craig William. "Laser transfer processing of functional ceramic films." Thesis, University of Leeds, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.589013.

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The incorporation of ferroelectric films, traditionally fabricated at high temperatures, with modern low temperature substrates has been an ongoing issue for the electroceramic community in recent years. The majority of ferroelectric film fabrication techniques utilise high temperature processing, with required temperatures ranging from 550-700 DC, for the production of thin films, to ",900-1200 DC, for thick films and bulk ceramics, with some fiuxes allowing fabrication at 850 DC. Some lead free electroceramics require processing at even higher temperatures. The limit of thermal stability for

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17

Ramme, Mark. "Ultrafast Laser Material Processing For Photonic Applications." Doctoral diss., University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5846.

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Femtosecond Laser Direct Writing (FLDW) is a viable technique for producing photonic devices in bulk materials. This novel manufacturing technique is versatile due to its full 3D fabrication capability. Typically, the only requirement for this process is that the base material must be transparent to the laser wavelength. The modification process itself is based on non-linear energy absorption of laser light within the focal volume of the incident beam. This thesis addresses the feasibility of this technique for introducing photonic structures into novel dielectric materials. Additionally, thi

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18

Moorhouse, Colin. "Laser processing of printed circuit board materials." Thesis, Heriot-Watt University, 2006. http://hdl.handle.net/10399/195.

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19

Al-Waidh, Aos. "Manufacture of metamaterials using laser processing techniques." Thesis, Liverpool John Moores University, 2016. http://researchonline.ljmu.ac.uk/4455/.

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20

Denning, Paul Michael. "High power laser surface processing of hydroxyapatite." Thesis, University of Liverpool, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399182.

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21

Sun, Yunlong. "Laser processing optimization for semiconductor based devices /." Full text open access at:, 1997. http://content.ohsu.edu/u?/etd,3.

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22

Yusoff, Nukman bin. "A study on laser processing of wood." Thesis, Loughborough University, 2006. https://dspace.lboro.ac.uk/2134/35072.

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The carbon dioxide (CO2) laser woodcutting has been used as an alternative to traditional wood machining processes. Smaller kerf width and non-contact machining were among the advantages and unique features of laser woodcutting. On the other hand, conventional wood machining such as sawing involves the application of force to separate chips from the workpiece until the desired size of workpiece is achieved. The focus of this research is to study and identify the quality of CO2 laser woodcutting. Various species of Malaysian wood have been used for this study. The initial experiment was carried

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23

Belloni, Valeria. "Spatial and temporal pulse shaping for ultrafast laser materials processing." Electronic Thesis or Diss., Bourgogne Franche-Comté, 2023. http://www.theses.fr/2023UBFCD055.

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Le traitement par laser ultrarapide a suscité un grand intérêt dans les applications industrielles en raison de sa capacité à réaliser une ablation précise et de haute qualité dans les matériaux. Cependant, les contraintes liées aux lasers, telles que l'énergie des impulsions et les taux de répétition, ont limité son développement, en particulier dans les environnements industriels.Dans ce cadre, la personnalisation des profils spatiaux et temporels des faisceaux laser peut améliorer l'interaction entre le laser et le matériau. Les techniques de mise en forme des faisceaux jouent un rôle cruci

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24

Gross, Markus Sebastian. "Transient numerical simulation of laser materials processing with focus on laser cutting." Thesis, Heriot-Watt University, 2004. http://hdl.handle.net/10399/1119.

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25

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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26

Fox, Mahlen David Thomas. "Control and monitoring techniques for laser materials processing." Thesis, Heriot-Watt University, 2002. http://hdl.handle.net/10399/398.

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27

Soib, Bin Selamat Mohmad. "Laser surface processing of Ti-6Al-4V alloy." Thesis, University of Strathclyde, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366777.

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28

Lobo, Leon M. "Solid phase by-products of laser material processing." Thesis, Loughborough University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.272931.

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29

Erk, Patrick P. (Patrick Peter). "Digital signal processing techniques for laser-doppler anemometry." Thesis, Massachusetts Institute of Technology, 1990. http://hdl.handle.net/1721.1/43026.

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30

Martinez-Jimenez, Gregorio. "Laser processing of amorphous silicon for photonic applications." Thesis, University of Southampton, 2017. https://eprints.soton.ac.uk/415853/.

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The topic of the research that is presented in this thesis is the development of a laser-based method for the crystallization of amorphous silicon (a-Si) films, deposited on various planar substrates for the fabrication of photonic structures. The emphasis is on lithium niobate which has many useful properties for photonic applications. This research stems from experimental evidence suggesting that it is possible to produce large Si crystallites by irradiating a-Si with continuous wave laser beams at visible wavelengths. This method has been particularly successful in semiconductor core optica

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31

Kamil, Ahmad. "Post processing for nylon 12 laser sintered components." Thesis, University of Newcastle upon Tyne, 2016. http://hdl.handle.net/10443/3480.

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This research investigates the effect of post-processing on the mechanical characteristics and behaviour of laser sintered components produced by selective laser sintering (SLS). It aims to understand the material’s behaviour and to develop postprocessing methods that can be used to improve and maintain consistency in the mechanical properties of the layer manufactured material. Duraform Polyamide (Nylon 12) and a Sinterstation VanguardTM SLS machine were used to produce test specimens. The behaviour of the layer material characteristics was established using different fabrication orientations

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32

Oliveira, Uazir Orion Bezerra de. "Laser treatment of alloys: processing, microstructure and structural properties." [S.l. : [Groningen : s.n.] ; University Library Groningen] [Host], 2007. http://irs.ub.rug.nl/ppn/298999803.

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33

Miroshnikova, Natalia. "Investigation of laser drilling processing using Speckle Correlation techniques." Licentiate thesis, Luleå, 2004. http://epubl.luth.se/1402-1757/2004/030.

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34

Nguyen, Hoang Cuong. "High speed processing for laser doppler blood flow imaging." Thesis, University of Nottingham, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.517694.

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35

England, James Mark Carson. "In situ laser reflectometry of thermal processing of silicon." Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239256.

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36

Bailey, Eric Stanton. "Sparse Frequency Laser Radar Signal Modeling and Doppler Processing." University of Dayton / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1271937372.

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37

Sun, Hongqing. "Microstructure Evolution of Bulk Metallic Glasses via Laser Processing." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1287025216.

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38

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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39

Chen, Xiaoming. "Laser-cluster interaction and its applications in semiconductor processing /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.

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40

Teppitaksak, Achaya. "Advanced laser sources for industrial processing and remote sensing." Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/46040.

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In the fifty years since their discovery, the use of laser oscillators and amplifiers has increased to cover a wide range of applications. This thesis develops diode-pumped solid-state (DPSS) lasers for two main applications: industrial processing and remote sensing. The first half of this thesis investigates the development of bounce geometry lasers that can be used to generate high power light sources suitable for industrial processing using diode-pumped Nd:YVO4 laser sources at both 1342nm and 1064nm transitions. The first of these investigations develops bounce geometry configuration Nd:YV

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41

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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42

Cevikbas, Orcun. "Data Acquisition And Processing Interface Development For 3d Laser Rangefinder." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607514/index.pdf.

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In this study, it is aimed to improve the previously developed data acquisition program which was run under DOS and 2D surface reconstruction program under Windows. A new system is set up and both data acquisition and processing software are developed to collect and process data within just one application, running under Windows. The main goal of the thesis is to acquire and process the range data taken from the laser rangefinder in order to construct the 3D image map of simple objects in different positions for indoor environments. The data acquisition program collects data in helical way.

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43

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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44

Sharp, Martin Charles. "Mathematical modelling of continuous wave CO2 laser processing of materials." Thesis, Imperial College London, 1986. http://hdl.handle.net/10044/1/38157.

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45

Gečys, Paulius. "Ultrashort pulsed laser processing of thin-films for solar cells." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2012. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20121001_093555-45841.

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Present PhD thesis is the experimental and theoretical analysis of thin layer ultrashort pulsed laser ablation processes for photovoltaic devices. Experimental work was supported by modeling and simulation of energy coupling and dissipation inside the layers. The absorbed laser energy was transformed to localized transient heating inside the structure. Selectiveness of the ablation process was defined by optical and mechanical properties of the materials, and selection of the laser wavelength facilitated control of the structuring process. The 1064 nm wavelength was found optimal for the CIGS

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46

Wagner, Franz X. "Excimer laser ablation and processing of II-VI compound semiconductors." Thesis, University of Hull, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363271.

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47

Shakeel, Safdar. "Effects of non-conventional beam geometries in laser materials processing." Thesis, University of Manchester, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.545860.

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The way the temperature is distributed inside the material is of prime importance in laser materials processing. Optimisation of different laser processes requires control over the temperature distribution in order to control microstructure and residual stressesb y manipulating heating/cooling rates and thermal gradients. Currently most of the laser material processing is carried out by either circular or rectangular beam geometry with variation in temperature distribution caused by either the variation of laser power, spot size or scanning speed. Variations in these parameters are often limit

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48

Shokeen, Lalit. "Multiscale simulation of laser ablation and processing of semiconductor materials." Doctoral diss., University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5495.

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We present a multiscale model of laser-solid interactions in silicon based on an empirical potential developed under conditions of strong electronic excitations. The parameters of the interatomic potential depends on the temperature of the electronic subsystem Te, which is directly related to the density of the electron-hole pairs and hence the number of broken bonds. We analyze the dynamics of this potential as a function of electronic temperature Te and lattice temperature Tion. The potential predicts phonon spectra in good agreement with finite-temperature density-functional theory (DFT), i

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49

Peters, Christopher N. D. "In process monitoring and control for Nd:YAG laser material processing." Thesis, University of Liverpool, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399233.

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50

Gomez, S. "Laser induced fluorescence measurements in inductivity coupled of processing plasmas." Thesis, Queen's University Belfast, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368755.

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