Gotowe bibliografie tematyczne / Beam shaping

Gotowa bibliografia na temat „Beam shaping”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 20 lutego 2023

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Artykuły w czasopismach na temat "Beam shaping"

Dickey, Fred M. "Laser Beam Shaping". Optical Engineering 42, nr 11 (1.11.2003): 3077. http://dx.doi.org/10.1117/1.1624611.

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Dickey, Fred M. "Laser Beam Shaping". Optics and Photonics News 14, nr 4 (1.04.2003): 30. http://dx.doi.org/10.1364/opn.14.4.000030.

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Hao, Bing, i James Leger. "Polarization beam shaping". Applied Optics 46, nr 33 (19.11.2007): 8211. http://dx.doi.org/10.1364/ao.46.008211.

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Shiloh, Roy, Roei Remez i Ady Arie. "Electron-Beam Shaping". Microscopy and Microanalysis 21, S3 (sierpień 2015): 2305–6. http://dx.doi.org/10.1017/s1431927615012301.

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Jabbour, Toufic G., i Stephen M. Kuebler. "Vectorial beam shaping". Optics Express 16, nr 10 (2.05.2008): 7203. http://dx.doi.org/10.1364/oe.16.007203.

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Leavitt, Dennis D. "Dynamic Beam Shaping". Medical Dosimetry 15, nr 2 (1990): 47–50. http://dx.doi.org/10.1016/0958-3947(90)90033-e.

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Lavelle, John, i Créidhe O'Sullivan. "Beam shaping using Gaussian beam modes". Journal of the Optical Society of America A 27, nr 2 (29.01.2010): 350. http://dx.doi.org/10.1364/josaa.27.000350.

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Salik, Boaz, Joseph Rosen i Ammon Yariv. "One-dimensional beam shaping". Journal of the Optical Society of America A 12, nr 8 (1.08.1995): 1702. http://dx.doi.org/10.1364/josaa.12.001702.

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Romero, L. A., i F. M. Dickey. "Lossless laser beam shaping". Journal of the Optical Society of America A 13, nr 4 (1.04.1996): 751. http://dx.doi.org/10.1364/josaa.13.000751.

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Jia, Jia, Changhe Zhou, Xiaohui Sun i Liren Liu. "Superresolution laser beam shaping". Applied Optics 43, nr 10 (1.04.2004): 2112. http://dx.doi.org/10.1364/ao.43.002112.

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Rozprawy doktorskie na temat "Beam shaping"

Litvin, Igor A. "Intra–cavity laser beam shaping". Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/4018.

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Thesis (PhD (Physics))--University of Stellenbosch, 2010.
ENGLISH ABSTRACT: There are many applications where a Gaussian laser beam is not ideal, for example, in areas such as medicine, data storage, science, manufacturing and so on, and yet in the vast majority of laser systems this is the fundamental output mode. Clearly this is a limitation, and is often overcome by adapting the application in mind to the available beam. A more desirable approach would be to create a laser beam as the output that is tailored for the application in mind – so called intra-cavity laser beam shaping. The main goal of intra-cavity beam shaping is the designing of laser cavities so that one can produce beams directly as the output of the cavity with the required phase and intensity distribution. Shaping the beam inside the cavity is more desirable than reshaping outside the cavity due to the introduction of additional external losses and adjustment problems. More elements are required outside the cavity which leads to additional costs and larger physical systems. In this thesis we present new methods for phase and amplitude intra– cavity beam shaping. To illustrate the methods we give both an analytical and numerical analysis of different resonator systems which are able to produce customised phase and intensity distributions. In the introduction of this thesis, a detailed overview of the key concepts of optical resonators is presented. In Chapter 2 we consider the well–known integral iteration algorithm for intra–cavity field simulation, namely the Fox–Li algorithm and a new method (matrix method), which is based on the Fox–Li algorithm and can decrease the computation time of both the Fox–Li algorithm and any integral iteration algorithms. The method can be used for any class of integral iteration algorithms which has the same calculation integrals, with changing integrants. The given method appreciably decreases the computation time of these algorithms and approaches that of a single iteration. In Chapter 3 a new approach to modeling the spatial intensity profile from Porro prism resonators is proposed based on rotating loss screens to mimic the apex losses of the prisms. A numerical model based on this approach is presented which correctly predicts the output transverse field distribution found experimentally from such resonators. In Chapter 4 we present a combination of both amplitude and phase shaping inside a cavity, namely the deployment of a suitable amplitude filter at the Fourier plane of a conventional resonator configuration with only spherical curvature optical elements, for the generation of Bessel–Gauss beams as the output. In Chapter 5 we present the analytical and numerical analyses of two new resonator systems for generating flat–top–like beams. Both approaches lead to closed form expressions for the required cavity optics, but differ substantially in the design technique, with the first based on reverse propagation of a flattened Gaussian beam, and the second a metamorphosis of a Gaussian into a flat–top beam. We show that both have good convergence properties, and result in the desired stable mode. In Chapter 6 we outline a resonator design that allows for the selection of a Gaussian mode by diffractive optical elements. This is made possible by the metamorphosis of a Gaussian beam into a flat–top beam during propagation from one end of the resonator to the other. By placing the gain medium at the flat–top beam end, it is possible to extract high energy in a low–loss cavity.
AFRIKAANSE OPSOMMING: Daar is verskeie toepassings waar ŉ Gaussiese laser bundel nie ideaal is nie, in gebiede soos mediese veld, stoor van data, vervaardiging en so meer, en tog word die meeste laser sisteme in die fundamentele mode bedryf. Dit is duidelik ’n beperking, en word meestal oorkom deur aanpassing van die toepassing tot die beskikbare bundel. ’n Beter benadering sou wees om ŉ laser bundel te maak wat afgestem is op die toepassing - sogenaamde intra-resonator bundel vorming. Die hoofdoel van intra-resonator bundel vorming is om resonators te ontwerp wat direk as uitset kan lewer wat die gewenste fase en intensiteits-distribusie vertoon. Vorming van die bundel in die resonator is voordeliger omdat die vorming buite die resonator tot addisionele verliese asook verstellings probleme bydra. Meer elemente word benodig buite die resonator wat bydra tot hoër koste en groter sisteme. In hierdie tesis word nuwe fase en amplitude intra-resonator bundelvormings metodes voorgestel. Om hierdie metode te demonstreer word analitiese en numeriese analises vir verskillende resonator sisteme wat aangepaste fase en intensiteit distribusies produseer, bespreek. In die inleiding van die tesis word ŉ detailleer oorsig oor die sleutel konsepte van optiese resonators voorgelê. In hoofstuk 2 word die bekende integraal iterasie algoritme vir intraresonator veld simulasie, naamlik die Fox-Li algoritme, en ŉ nuwe metode (matriks metode), wat gebaseer is op die Fox-Li algoritme, en die berekeningstyd van beide die Fox-Li algoritme en enige ander integraal iterasie algoritme verminder. Die metode kan gebruik word om enige klas van integraal iterasie algoritmes wat dieselfde berekenings integrale het, met veranderde integrante (waar die integrand die veld van die lig golf is in die geval van die Fox-Li algoritme, IFTA, en die skerm metode. Die voorgestelde metode verminder die berekeningstyd aansienlik, en is benaderd die van ŉ enkel iterasie berekening. In hoofstuk 3 word ŉ nuwe benadering om die modellering van die ruimtelike intensiteitsprofiel van Porro prisma resonators, gebaseer op roterende verliese skerms om die apeks-verliese van die prismas te benader, voorgestel. ŉ Numeriese model gebaseer op hierdie benadering wat die uitset van die transversale veld distribusie in eksperimentele resonators korrek voorspel, word voorgestel. In hoofstuk 4 word ŉ tegniek vir die generering van Bessel-Gauss bundels deur die gebruik van ŉ kombinasie van amplitude en fase vorming in die resonator en ŉ geskikte amplitude filter in die Fourier vlak van ŉ konvensionele resonator konfigurasie met optiese elemente wat slegs sferiese krommings het, voorgestel. In hoofstuk 5 word die analitiese en numeriese analises van twee nuwe resonator sisteme vir die generering van sogenaamde “flat–top” bundels voorgestel. Beide benaderings lei na ŉ geslote vorm uitdrukking vir die resonator optika wat benodig word, maar verskil noemenswaardig in die ontwerptegniek. Die eerste is baseer op die terug voortplanting van plat Gaussiese bundel, en die tweede op metamorfose van Gaussiese “flat-top” bundel. Ons toon aan dat beide tegnieke goeie konvergensie het, en in die gevraagde stabiele modus lewer. In hoofstuk 6 skets ons die resonator ontwerp wat die selektering van ŉ Gaussiese modus deur diffraktiewe optiese element moontlik maak. Dit word moontlik deur die metamorfose van ’n Gaussiese bundel na ŉ “flat-top” gedurende die voortplanting van die een kant van die resonator na die ander. Deur die wins medium aan die “flat–top” kant van die bundel te plaas word dit moontlik om hoë energie te onttrek in ŉ lae verlies resonator.

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Zeng, Danyong. "ANNULAR BEAM SHAPING AND OPTICAL TREPANNING". Doctoral diss., University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2593.

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Percussion drilling and trepanning are two laser drilling methods. Percussion drilling is accomplished by focusing the laser beam to approximately the required diameter of the hole, exposing the material to one or a series of laser pulses at the same spot to melt and vaporize the material. Drilling by trepanning involves cutting a hole by rotating a laser beam with an optical element or an x–y galvo-scanner. Optical trepanning is a new laser drilling method using an annular beam. The annular beams allow numerous irradiance profiles to supply laser energy to the workpiece and thus provide more flexibility in affecting the hole quality than a traditional circular laser beam. Heating depth is important for drilling application. Since there are no good ways to measure the temperature inside substrate during the drilling process, an analytical model for optical trepanning has been developed by considering an axisymmetric, transient heat conduction equation, and the evolutions of the melting temperature isotherm, which is referred to as the melt boundary in this study, are calculated to investigate the influences of the laser pulse shapes and intensity profiles on the hole geometry. This mathematical model provides a means of understanding the thermal effect of laser irradiation with different annular beam shapes. To take account of conduction in the solid, vaporization and convection due to the melt flow caused by an assist gas, an analytical two-dimensional model is developed for optical trepanning. The influences of pulse duration, laser pulse length, pulse repetition rate, intensity profiles and beam radius are investigated to examine their effects on the recast layer thickness, hole depth and taper. The ray tracing technique of geometrical optics is employed to design the necessary optics to transform a Gaussian laser beam into an annular beam of different intensity profiles. Such profiles include half Gaussian with maximum intensities at the inner and outer surfaces of the annulus, respectively, and full Gaussian with maximum intensity within the annulus. Two refractive arrangements have been presented in this study. Geometric optics, or ray optics, describes light propagation in terms of rays. However, it is a simplification of optics, and fails to account for many important optical effects such as diffraction and polarization. The diffractive behaviors of this optical trepanning system are stimulated and analyzed based on the Fresnel diffraction integral. Diffraction patterns of the resulting optical system are measured using a laser beam analyzer and compared with the theoretical results. Based on the theoretical and experimental results, the effects of experimental parameters are discussed. We have designed the annular beam shaping optical elements and the gas delivery system to construct an optical trepanning system. Laser drilling experiments are performed on the Stainless Steel-316 (SS 316) plate and the Inconel 718 (IN 718) plate. The geometry of the trepanning holes with different sizes is presented in this study.
Ph.D.
Department of Mechanical, Materials and Aerospace Engineering;
Engineering and Computer Science
Mechanical Engineering

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Mi, Yongcui. "Novel beam shaping and computer vision methods for laser beam welding". Licentiate thesis, Högskolan Väst, Avdelningen för produktionssystem (PS), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-16970.

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Laser beam welding has been widely applied in different industrial sectors due to its unique advantages. However, there are still challenges, such as beam positioning in T-joint welding, and gap bridging in butt joint welding,especially in the case of varying gap width along a joint. It is expected that enabling more advanced control to a welding system, and obtaining more in-depth process knowledge could help to solve these issues. The aim of this work is to address such welding issues by a laser beam shaping technology using a novel deformable mirror together with computer vision methods and also to increase knowledge about the benefits and limitations with this approach. Beam shaping in this work was realized by a novel deformable mirror system integrated into an industrial processing optics. Together with a wave front sensor, a controlled adaptive beam shaping system was formed with a response time of 10 ms. The processes were monitored by a coaxial camera with selected filters and passive or active illumination. Conduction mode autogenous bead-on-plate welding and butt joint welding experiments have been used to understand the effect of beam shaping on the melt pool geometry. Circular Gaussian, and elliptical Gaussian shapes elongated transverse to and along the welding direction were studied. In-process melt pool images and cross section micrographs of the weld seams/beads were analyzed. The results showed that the melt pool geometry can be significantly modified by beam shaping using the deformable mirror. T-joint welding with different beam offset deviations relative to the center of the joint line was conducted to study the potential of using machine learning to track the process state. The results showed that machine learning can reach sufficient detection and estimation performance, which could also be used for on-line control. In addition, in-process and multidimensional data were accurately acquired using computer vision methods. These data reveal weaknesses of current thermo-fluid simulation model, which in turn can help to better understand and control laser beam welding. The obtained results in this work shows a huge potential in using the proposed methods to solve relevant challenges in laser beam welding.
Lasersvetsning används i stor utsträckning i olika industrisektorer på grund av dess unika fördelar. Det finns emellertid fortfarande utmaningar, såsom rätt positionering av laserstrålen vid genomträngningssvetsning av T-fogar och hantering av varierande spaltbredd längs fogen vid svetsning av stumfogar. Sådana problem förväntas kunna lösas med avancerade metoder för automatisering, metoder som också förväntas ge fördjupade kunskaper om processen. Syftet med detta arbete är att ta itu med dessa problem med hjälp av en teknik för lasereffektens fördelning på arbetsstycket, s.k. beam shaping. Det sker med hjälp av en ny typ av i realtid deformerbar spegel tillsammans med bildbehandling av kamerabilder från processen. För- och nackdelar med detta tillvägagångssätt undersöks.Beam shaping åstadkoms med hjälp av ny typ av deformerbart spegelsystem som integreras i en industriell processoptik. Tillsammans med en vågfrontsensor bildas ett adaptivt system för beam shaping med en svarstid på 10 ms. Processen övervakas av en kamera linjerad koaxialt med laserstrålen. För att kunna ta bilder av svetspunkten belyses den med ljus av lämplig våglängd, och kameran är försedd med ett motsvarande optiskt filter. Försök har utförts med svetsning utan tillsatsmaterial, direkt på plåtar, svetsning utan s.k. nyckelhål, för att förstå effekten av beam shaping på svetssmältans geometri. Gauss fördelade cirkulära och elliptiska former, långsträckta både tvärs och längs svetsriktningen har studerats. Bilder från svetssmältan har analyserats och även mikrostrukturen i tvärsnitt från de svetsade plåtarna. Resultaten visar att svetssmältans geometri kan modifieras signifikant genom beam shaping med hjälp av det deformerbara spegelsystemet. Genomträngningssvetsning av T-fogar med avvikelser relativt foglinjens centrum genomfördes för att studera potentialen i att använda maskininlärning för att fånga processens tillstånd. Resultaten visade att maskininlärning kan nå tillräcklig prestanda för detektering och skattning av denna avvikelse. Något som också kan användas för återkopplad styrning. Flerdimensionell processdata har samlats i realtid och analyserats med hjälp av bildbehandlingsmetoder. Dessa data avslöjar brister i nuvarande simuleringsmodeller,vilket i sin tur hjälper till med att bättre förstå och styra lasersvetsning.Resultaten från detta arbete uppvisar en god potential i att använda de föreslagna metoderna för att lösa relevanta utmaningar inom lasersvetsning.

Till licentiatuppsats hör 2 inskickade artiklar, som visas inte nu.

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Sinigardi, Stefano <1985&gt. "Laser driven proton acceleration and beam shaping". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amsdottorato.unibo.it/6230/.

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In the race to obtain protons with higher energies, using more compact systems at the same time, laser-driven plasma accelerators are becoming an interesting possibility. But for now, only beams with extremely broad energy spectra and high divergence have been produced. The driving line of this PhD thesis was the study and design of a compact system to extract a high quality beam out of the initial bunch of protons produced by the interaction of a laser pulse with a thin solid target, using experimentally reliable technologies in order to be able to test such a system as soon as possible. In this thesis, different transport lines are analyzed. The first is based on a high field pulsed solenoid, some collimators and, for perfect filtering and post-acceleration, a high field high frequency compact linear accelerator, originally designed to accelerate a 30 MeV beam extracted from a cyclotron. The second one is based on a quadruplet of permanent magnetic quadrupoles: thanks to its greater simplicity and reliability, it has great interest for experiments, but the effectiveness is lower than the one based on the solenoid; in fact, the final beam intensity drops by an order of magnitude. An additional sensible decrease in intensity is verified in the third case, where the energy selection is achieved using a chicane, because of its very low efficiency for off-axis protons. The proposed schemes have all been analyzed with 3D simulations and all the significant results are presented. Future experimental work based on the outcome of this thesis can be planned and is being discussed now.

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Ratsibi, Humbelani Edzani. "Laser drilling of metals and glass using zero-order bessel beams". University of the Western Cape, 2013. http://hdl.handle.net/11394/5428.

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>Magister Scientiae - MSc
This dissertation consists of two main sections. The first section focuses on generating zero order Bessel beams using axicons. An axicon with an opening angle y = 5⁰ was illuminated with a Gaussian beam of width ω₀ = 1.67 mm from a cw fiber laser with central wavelength λ = 1064 nm to generate zero order Bessel beams with a central spot radius r₀ = 8.3 ± 0.3 μm and propagation distance ½zmax = 20.1 ± 0.5 mm. The central spot size of a Bessel beam changes slightly along the propagation distance. The central spot radius r₀ can be varied by changing the opening angle of the axicon, y, and the wavelength of the beam. The second section focuses on applications of the generated Bessel beams in laser microdrilling. A Ti:Sapphire pulsed femtosecond laser (λ = 775 nm, ω₀ = 2.5 mm, repetition rate kHz, pulse energy mJ, and pulse duration fs) was used to generate the Bessel beams for drilling stainless steel thin sheets of thickness 50 μm and 100 μm and microscopic glass slides 1 mm thick. The central spot radius was r₀ = 15.9 ± 0.3 μm and ½zmax = 65.0 ± 0.5 mm. The effect of the Bessel beam shape on the quality of the holes was analysed and the results were discussed. It was observed that Bessel beams drill holes of better quality on transparent microscopic glass slides than on stainless steel sheet. The holes drilled on stainless steel sheets deviated from being circular on both the top and bottom surface for both thicknesses. However the holes maintained the same shape on both sides of each sample, indicating that the walls are close to being parallel. The holes drilled on the glass slides were circular and their diameters could be measured. The measured diameter (15.4±0.3 μm) of the hole is smaller than the diameter of the central spot (28.2 ± 0.1 μm) of the Bessel beam. Increasing the pulse energy increased the diameter of the drilled hole to a value close to the measured diameter of the central spot.

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Rafayelyan, Mushegh. "Singular beam shaping from spin-orbit flat optics". Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0583/document.

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Dans ce travail nous avons résolu deux problèmes principaux de la mise en forme topologique de faisceau paraxial pour les composants plans : la modalité et le polychromatisme.Nous les résolvons en introduisant de nouveaux concepts d’éléments optiques à interaction spin orbite,à savoir la “q-plate modale” et la “q-plate Bragg-Berry”. D’un côté, la q-plate modale convertit un faisceau gaussien incident en un faisceau de Laguerre-Gauss pour un indice radial et un indice d’azimut donnés, ce qui par conséquent dépasse les capacités des q-plates conventionnelles qui ne modifient que le degré de liberté azimutal, c.à.d. le moment orbital angulaire de la lumière. À des fins expérimentales, deux approches ont été développées : une basée sur des lames de verres nanostructurées artificiellement, l’autre sur des défauts topologiques de cristaux liquides auto-organisés naturellement. D’un autre côté, la q-plate Bragg-Berry consiste en une fine couche inhomogène de cristaux liquides chiraux (cholestériques) devant un miroir, ce qui fournit une mise en forme de faisceau spin-orbite pleinement efficace sur une large bande spectrale du faisceau incident, contrairement au q-plates conventionnelles qui ne sont fabriqués que pour une longueur d’onde donnée. Par ailleurs, nous obtenons une mise en forme de faisceau spin-orbite ultra-large bande en induisant une modulation de la structure supramoléculaire torsadée des cristaux liquides cholestériques selon la direction de propagation de la lumière. Nous montrons également que la présence du miroir derrière permet un puissant contrôle spatio-temporel des propriétés vectorielles de la polarisation du champ lumineux générées par la q-plate Bragg-Berry
It is well-known that paraxial coherent electromagnetic fields can be completelycharacterized in terms of their radial and azimuthal spatial degrees of freedom in the transverse planethat add to the polarization degree of freedom and wavelength. In this work we address two mainissues of paraxial beam shaping that are the modality and the polychromaticity in the context of flatopticsthat we address by introducing novel concepts of spin-orbit optical elements. Namely, the‘modal q-plate’ and the ‘Bragg-Berry q-plate’. On the one hand, modal q-plate converts an incidentfundamental Gaussian beam into a Laguerre-Gaussian beam of given radial and azimuthal indices,hence going beyond the capabilities of conventional q-plates that only control the azimuthal degreeof freedom, i.e. the orbital angular momentum content of light. Towards experimental realization ofmodal q-plates, two approaches are developed: one based on artificially nanostructured glasses andanother based on naturally self-organized liquid crystal topological defects. On the other hand,Bragg-Berry q-plate consist of mirror-backed inhomogeneous thin film of chiral liquid crystal(cholesteric) that provides fully efficient spin-orbit beam shaping over broad spectral range of theincident beam, in contrast to the conventional q-plates that are designed for single wavelength.Furthermore, ultra-broadband spin-orbit beam shaping is achieved by inducing an extra modulationof the supramolecular twisted structure of the cholesteric liquid crystal along the propagationdirection. We also show that the presence of a back-mirror allows a powerful spatio-temporal controlof the polarization vectorial properties of the light fields generated by Bragg-Berry q-plate

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Maigyte, Lina. "Shaping of light beams with photonic crystals : spatial filtering, beam collimation and focusing". Doctoral thesis, Universitat Politècnica de Catalunya, 2014. http://hdl.handle.net/10803/277571.

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The research developed in the framework of this PhD thesis is a theoretical, numerical and experimental study of light beam shaping (spatial filtering, beam collimation and focusing) in the visible frequency range using photonic crystal structures. Photonic crystals (PhCs) are materials with periodic, spatially modulated refractive index on the wavelength scale. They are primarily known for their chromatic dispersion properties. However, they can also modify the spatial dispersion, which allows managing the spatial properties of the monochromatic light beams. In the first part of my thesis we experimentally show that particular spatial dispersion modification in PhCs can lead to spatial (angular) filtering of light beams. The study is focused on the spatial filtering efficiency improvement by introducing chirp (the variation of longitudinal period of the structure) in the crystal structure. Additionally, to enhance the effect, we consider different geometries and materials. The work presented in this PhD thesis brings closer to reality the creation of a new generation spatial filters for micro-photonic circuits and micro-devices. The second part of the study is devoted to the theoretical, numerical and experimental analysis of the formation of negative spatial dispersion in PhCs, which gives rise to collimation and focusing effects behind the PhCs. The ideas developed in my PhD also work in lossy systems, in particular in metallic PhCs. The simulation results for metallic PhCs are presented, in which both effects- spatial filtering and beam focusing, are shown.
La recerca desenvolupada en el marc d'aquesta tesi doctoral és un estudi teòric, numèric i experimental de la modificació de la forma de feixos de llum (filtratge espacial, col·limació i focalització) en el rang visible de freqüències utilitzant estructures de cristall fotònic. Els cristalls fotònics (CFs) són materials amb una modulació periòdica de l'índex de refracció en l'escala de la longitud d'ona, i són principalment coneguts per les seves propietats relacionades amb la dispersió temporal. Tot i això, la dispersió espacial també pot ser modificada mitjançant CFs, fet que permet controlar les propietats espacials de feixos monocromàtics de llum. En la primera part de la tesi, mostrem experimentalment el fet que certes modificacions de la dispersió espacial en CFs poden donar lloc a filtratge espacial (angular) de feixos de llum. L'estudi es focalitza en la millora de l'eficiència del filtratge espacial mitjançant la introducció de "chirp" (la variació del període longitudinal de l'estructura) en el CF. A més, per tal d'incrementar l'efecte considerem diferents estructures i materials. El treball presentat en aquesta tesi doctoral acosta a la realitat la creació d'una nova generació de filtres espacials per a circuits micro-fotònics i micro-dispositius. La segona part d'aquest estudi se centra en l'anàlisi teòric, numèric i experimental de la formació de dispersió espacial negativa en CFs, la gual dóna lloc a efectes de col·limació i focalització un cop travessat el CF. Les idees desenvolupades en aquesta tesi doctoral també són aplicables a sistemes amb pèrdues, en particular a CFs metàl·lics. Els resultats de les simulacions mostren l'existència d'ambdós efectes, filtratge espacial i focalització, en CFs metàl·lics.

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Yang, Zhengyi. "Optical and acoustic beam shaping for imaging and manipulation". Thesis, University of Dundee, 2014. https://discovery.dundee.ac.uk/en/studentTheses/18d650a0-53ba-4f4d-9d61-78c3a6b68bf6.

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Sound and light show many similarities because they both propagate as waves. This means they share the same wave properties such as reflection, refraction, scattering, diffraction, and so on. The similarities between them bring a lot of opportunities for translating knowledge of one onto the other. When compared to ultrasound, and particularly in microscopy and micromanipulation, optics is a more-developed and better-understood area, partly due to the difficulty of producing complex ultrasonic beams. Hence it makes perfect sense to explore sound based on the research of optics. Differences between light and sound are mainly due to the nature variety of their mechanisms and different scale of their wavelength. Those difference makes either light or sound suitable for certain applications. This thesis will focus on the currently technology for beam shaping for acoustic and optical waves, making use of their similarities, especially for imaging and manipulation purposes. When light scattering and absorption is low, optical scattering is able to provide high resolution and suitable for imaging. A low-cost Light-Sheet Tomography imaging system is built for monitoring the growth of plant roots based on optical scattering from the roots. When optical scattering and absorption is severe it dramatically decreases spatial resolution, optical absorption can be employed to generate less-scattered acoustic signals to form high contrast images of the optical absorbing structure in a sample. A photoacoustic imaging system featuring light sheet illumination is built, along with an automatic data acquisition system. 2D images acquired with this system are reconstructed with inverse Radon transformation. The short wavelength of optical waves makes them suitable for interaction with micron-scale objects, but less suitable for macro objects because the force does not easily scale up with the size of the targets. On the other hand, ultrasonic waves have the suitable wavelength and power level for interaction with mm- or even cm- size objects. Various ultrasonic beams with vortex wavefront were generated with a 1000-element phase-control transducer array to levitate and rotate a macro acoustic absorber by transferring linear and angular momentum from the acoustic beam to the absorber. The ratio between linear and angular momentum in the beam was measured simultaneously. With the same ultrasound transducer array, the delivery of a controllable negative radiation force onto prism-shape target is demonstrated to pull the prism towards the sound source. This is the first demonstration of macroscopic and ultrasonic tractor beam. The study of ultrasound and optical beam shaping has proven that the similarities between sound and light waves can be utilized to extend our existing knowledge on them, and further provides more opportunities on wave-matter interaction applications.

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Liu, Lihong. "Beam shaping of incoherent white light with faceted structure". Thesis, Strasbourg, 2018. http://www.theses.fr/2018STRAD010.

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La mise en forme de lumière blanche incohérente à l’aide d’un nouveau composant est proposée dans cette thèse. L'objectif était de réaliser une carte d'irradiance arbitraire sur un écran à l’aide d’une structure originale contenant seulement des facettes, légèrement inclinées par rapport à la direction d'origine selon leurs axes propres. Une approche basée sur l’optique géométrique a été utilisée pour concevoir et analyser la structure proposée. Celle-ci est constituée d’une matrice de facettes jouant le rôle de déflecteur. Nous avons étudié le cas en transmission et en réflexion. L’obtention des angles d’inclinaison s’est faite avec deux approches différentes : l'optimisation sous Zemax et le calcul analytique. Plusieurs critères de qualité ont été proposés pour comparer la carte d'irradiance. Le tolérancement a démontré qu’il est plus intéressant de travailler en transmission qu’en réflexion. Une réalisation a été faite avec succès en utilisant une technologie additive innovante
Beam shaping of incoherent white light with a large spectrum is proposed in this PhD thesis. The objective was to realize an arbitrary irradiance map on a target plane using a faceted structure. To maintain the design result within the geometrical optics domain, large facet element dimensions are required to obtain usable results. Each facet element can slightly tilt along its own axes to deflect the incident light, either by reflection, either by transmission. The calculation of the tilt angles is made by an analytical approach, and also by automatic optimization with Zemax. Several quality factors are proposed in order to qualify the illumination/irradiance chart on the screen. Because of the required tolerances on the fabrication technique, we show that it is more interesting to design a transmissive structure than a reflective one. With a new additive technology, a structure is realized successfully, showing the interest of the concept

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Victor, Brian M. "Custom Beam Shaping for High-Power Fiber Laser Welding". The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1238014676.

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Książki na temat "Beam shaping"

1941-, Dickey Fred M., Holswade Scott C. 1963- i Shealy David L, red. Laser beam shaping applications. Boca Raton, FL: Taylor & Francis/CRC Press, 2006.

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1941-, Dickey Fred M., i Holswade Scott C. 1963-, red. Laser beam shaping: Theory and techniques. New York: Marcel Dekker, 2000.

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Dickey, Fred M., i Todd E. Lizotte, red. Laser Beam Shaping Applications. Second edition. | Boca Raton, FL : CRC Press, Taylor & Francis Group, [2017]: CRC Press, 2017. http://dx.doi.org/10.1201/9781315371306.

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Diego, Calif ). Laser Beam Shaping (Conference) (14th 2013 San. Laser Beam Shaping XIV: 26 August 2013, San Diego, California, United States. Bellingham, Washington: SPIE, 2013.

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Andrew, Forbes. Laser beam shaping X: 3-4 August 2009, San Diego, California, United States. Redaktor SPIE (Society). Bellingham, Wash: SPIE, 2009.

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Andrew, Forbes. Laser beam shaping X: 3-4 August 2009, San Diego, California, United States. Redaktor SPIE (Society). Bellingham, Wash: SPIE, 2009.

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Kajzar, F., i R. Reinisch, red. Beam Shaping and Control with Nonlinear Optics. Boston: Kluwer Academic Publishers, 2002. http://dx.doi.org/10.1007/b117080.

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F, Kajzar, Reinisch Raymond, North Atlantic Treaty Organization. Scientific Affairs Division. i NATO Advanced Study Institute on Beam Shaping and Control with Nonlinear Optics (1997 : Cargèse, France), red. Beam shaping and control with nonlinear optics. New York: Plenum Press, 1998.

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Forbes, Andrew. Laser beam shaping X: 3-4 August 2009, San Diego, California, United States. Bellingham, Wash: SPIE, 2009.

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Wischeropp, Tim Marten. Advancement of Selective Laser Melting by Laser Beam Shaping. Berlin, Heidelberg: Springer Berlin Heidelberg, 2021. http://dx.doi.org/10.1007/978-3-662-64585-7.

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Części książek na temat "Beam shaping"

Dickey, Fred M., i Scott C. Holswade. "Beam Shaping A Review". W Laser Beam Shaping Applications, 383–418. Second edition. | Boca Raton, FL : CRC Press, Taylor & Francis Group, [2017]: CRC Press, 2017. http://dx.doi.org/10.1201/9781315371306-12.

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Lizotte, Todd E., i Orest Ohar. "Laser Beam Shaping through Fiber Optic Beam Delivery". W Laser Beam Shaping Applications, 293–327. Second edition. | Boca Raton, FL : CRC Press, Taylor & Francis Group, [2017]: CRC Press, 2017. http://dx.doi.org/10.1201/9781315371306-9.

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Dickey, Fred, i Scott Holswade. "Beam ShapingA Review". W Laser Beam Shaping Applications, 383–429. Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2017. http://dx.doi.org/10.1201/9781315371306-13.

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Donges, Axel, i Reinhard Noll. "Beam Shaping and Guiding". W Springer Series in Optical Sciences, 63–97. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-662-43634-9_4.

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Lizotte, Todd E. "Introduction". W Laser Beam Shaping Applications, 1–5. Second edition. | Boca Raton, FL : CRC Press, Taylor & Francis Group, [2017]: CRC Press, 2017. http://dx.doi.org/10.1201/9781315371306-1.

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Cherezova, T. Yu, i A. V. Kudryashov. "Laser Beam Shaping by Means of Flexible Mirrors". W Laser Beam Shaping Applications, 329–56. Second edition. | Boca Raton, FL : CRC Press, Taylor & Francis Group, [2017]: CRC Press, 2017. http://dx.doi.org/10.1201/9781315371306-10.

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Moskalev, I. S., V. V. Fedorov, S. B. Mirov, T. T. Basiev i P. G. Zverev. "Application of Laser Beam Shaping for Spectral Control of “Spatially Dispersive” Lasers". W Laser Beam Shaping Applications, 357–81. Second edition. | Boca Raton, FL : CRC Press, Taylor & Francis Group, [2017]: CRC Press, 2017. http://dx.doi.org/10.1201/9781315371306-11.

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Michaloski, Paul. "Illuminators for Microlithography". W Laser Beam Shaping Applications, 7–56. Second edition. | Boca Raton, FL : CRC Press, Taylor & Francis Group, [2017]: CRC Press, 2017. http://dx.doi.org/10.1201/9781315371306-2.

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Kurtz, Andrew F., Daniel D. Haas i Nissim Pilossof. "Laser Beam Shaping in Array-Type Laser Printing Systems". W Laser Beam Shaping Applications, 57–115. Second edition. | Boca Raton, FL : CRC Press, Taylor & Francis Group, [2017]: CRC Press, 2017. http://dx.doi.org/10.1201/9781315371306-3.

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Sercel, Jeffrey P., i Michael von Dadelszen. "Practical UV Excimer Laser Image System Illuminators". W Laser Beam Shaping Applications, 117–57. Second edition. | Boca Raton, FL : CRC Press, Taylor & Francis Group, [2017]: CRC Press, 2017. http://dx.doi.org/10.1201/9781315371306-4.

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Streszczenia konferencji na temat "Beam shaping"

Braunschweig, Robert, Paul Etienne Martin, José Antonio Ramos de Campos, Axel Kupisiewicz, Sébastien Estival i Mathieu Dijoux. "High-power femtosecond laser cutting and drilling combining beam-shaping and beam-splitting". W Laser Beam Shaping XVIII, redaktorzy Angela Dudley i Alexander V. Laskin. SPIE, 2018. http://dx.doi.org/10.1117/12.2322106.

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O'Dea, Brendan, Roger L. Farrow, Brian Victor, Juan Lugo, Ryan Hawke, Ken Gross, Aaron Hodges i in. "Variable beam high power fiber laser with optimized beam characteristics for metal cutting". W Laser Beam Shaping XIX, redaktorzy Angela Dudley i Alexander V. Laskin. SPIE, 2019. http://dx.doi.org/10.1117/12.2528809.

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Xu, Lixin, Zhipeng Dong, Shujie Li, Chun Gu i Peijun Yao. "High power wide band square-wave pulse generation at 1 μm in a passively mode-locked fiber laser". W Laser Beam Shaping XVIII, redaktorzy Angela Dudley i Alexander V. Laskin. SPIE, 2018. http://dx.doi.org/10.1117/12.2320186.

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Barthels, Thilo, i Martin Reininghaus. "High precision ultrashort pulsed laser drilling of thin metal foils by means of multibeam processing". W Laser Beam Shaping XVIII, redaktorzy Angela Dudley i Alexander V. Laskin. SPIE, 2018. http://dx.doi.org/10.1117/12.2320268.

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Rosales-Guzmán, Carmelo, Nkosiphile Andile Bhebhe i Andrew Forbes. "Generation of multiple vector beams using a single hologram". W Laser Beam Shaping XVIII, redaktorzy Angela Dudley i Alexander V. Laskin. SPIE, 2018. http://dx.doi.org/10.1117/12.2320451.

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Forbes, Andrew, i Adam Valles Mari. "Quantum mechanics with patterns of light (Conference Presentation)". W Laser Beam Shaping XVIII, redaktorzy Angela Dudley i Alexander V. Laskin. SPIE, 2018. http://dx.doi.org/10.1117/12.2320460.

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Faulhaber, Andreas, Tobias Haist, Wolfgang Osten, Stefan Haberl, Marc Gronle, Yousef Baroud i Sven Simon. "Dynamic holography for speckle noise reduction in hybrid measurement system". W Laser Beam Shaping XVIII, redaktorzy Angela Dudley i Alexander V. Laskin. SPIE, 2018. http://dx.doi.org/10.1117/12.2320486.

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Bourgin, Yannick, Falk Nagel, Patrick Fesser, Jean-Pierre Bergmann i Stefan Sinzinger. "High power laser beam shaping for welding applications by means of diffractive elements". W Laser Beam Shaping XVIII, redaktorzy Angela Dudley i Alexander V. Laskin. SPIE, 2018. http://dx.doi.org/10.1117/12.2320579.

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Köhler, Philipp, Andrei Ruskuc, Marius A. Weber, Michael H. Frosz, Ana Andres-Arroyo, Philip S. Russell i Tijmen G. Euser. "Excitation of higher-order modes in optofluidic hollow-core photonic crystal fiber". W Laser Beam Shaping XVIII, redaktorzy Angela Dudley i Alexander V. Laskin. SPIE, 2018. http://dx.doi.org/10.1117/12.2320594.

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Bhebhe, Nkosiphile Andile, Carmelo Rosales-Guzmán i Andrew Forbes. "Generation of propagation invariant vector flat-top beams". W Laser Beam Shaping XVIII, redaktorzy Angela Dudley i Alexander V. Laskin. SPIE, 2018. http://dx.doi.org/10.1117/12.2320887.

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Raporty organizacyjne na temat "Beam shaping"

Bowers, M. NIF Beam Shaping Masks. Office of Scientific and Technical Information (OSTI), październik 2001. http://dx.doi.org/10.2172/802916.

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Neveu, Nicole, Petr Anisimov i Dinh Nguyen. Optimization and Beam Shaping. Office of Scientific and Technical Information (OSTI), luty 2021. http://dx.doi.org/10.2172/1765843.

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Halavanau, Aliaksei. ELECTRON BEAM SHAPING AND ITS APPLICATIONS. Office of Scientific and Technical Information (OSTI), styczeń 2018. http://dx.doi.org/10.2172/1439279.

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Doerry, Armin W. Simple Array Beam-Shaping Using Phase-Only Adjustments. Office of Scientific and Technical Information (OSTI), lipiec 2015. http://dx.doi.org/10.2172/1194893.

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Malyzhenkov, Alexander, i Nikolai Yampolsky. Optimization of Compton Source Performance through Electron Beam Shaping. Office of Scientific and Technical Information (OSTI), wrzesień 2016. http://dx.doi.org/10.2172/1329533.

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Plotkowski, Alex. Fabrication and Modeling of Laser Additive Manufactured Materials with Multi-Beam Adaptive Beam Shaping. Office of Scientific and Technical Information (OSTI), grudzień 2018. http://dx.doi.org/10.2172/1550767.

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Miller, J. D., R. F. Schneider, H. S. Uhm, K. T. Nguyen i K. W. Struve. Pulse Shaping a High-Current Relativistic Electron Beam in Vacuum. Fort Belvoir, VA: Defense Technical Information Center, czerwiec 1990. http://dx.doi.org/10.21236/ada230674.

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J. Vujic, E. Greenspan, W.E. Kastenber, Y. Karni, D. Regev, K. N. Leung J.M. Verbeke, D. Chivers i in. Optimal Neutron Source & Beam Shaping Assembly for Boron Neutron Capture Therapy. Office of Scientific and Technical Information (OSTI), kwiecień 2003. http://dx.doi.org/10.2172/810841.

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Ellison, Chad M., Matthew J. Perricone, Kevin M. Faraone i Jerome T. Norris. Pulse shaping effects on weld porosity in laser beam spot welds : contrast of long- & short- pulse welds. Office of Scientific and Technical Information (OSTI), październik 2007. http://dx.doi.org/10.2172/921738.

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Klett, Jr, i Karl K. An Analysis of the Far-Field Radiation Pattern of the Ultraviolet Light-Emitting Diode (LED) Engin LZ4-00UA00 Diode with and without Beam Shaping Optics. Fort Belvoir, VA: Defense Technical Information Center, wrzesień 2015. http://dx.doi.org/10.21236/ada622302.

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