Relevant bibliographies by topics / Lasers Laser beams

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Lasers Laser beams'

Author: Grafiati
Published: 4 June 2021
Last updated: 8 February 2022

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Journal articles on the topic "Lasers Laser beams"

1

Lisiecki, A. "Comparison of Titanium Metal Matrix Composite Surface Layers Produced During Laser Gas Nitriding of Ti6Al4V Alloy by Different Types of Lasers." Archives of Metallurgy and Materials 61, no. 4 (December 1, 2016): 1777–84. http://dx.doi.org/10.1515/amm-2016-0287.

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Abstract The article presents the results of a comparative study of the nitriding process of titanium alloy substrate using two lasers with different characteristics of laser beams. One of the applied lasers was a high power diode laser emitting at a dominant wavelength of 808 nm, with a rectangular laser beam spot, and multimode energy distribution across the spot. The second laser was a solid state Yb:YAG disk laser emitting at a wavelength of 1.03 μm, with a circular beam spot, characterized by near Gaussian energy distribution across the spot. In a case of both lasers single stringer beads with a similar width and at similar energy input were produced. As a result of melting of the substrate with a laser beam in a pure gaseous nitrogen atmosphere composite surface layers with in situ precipitated titanium nitrides embedded in the metallic matrix of titanium alloy were produced, in both cases. However, the surface topography and structure is different for the surface layers produce by different lasers at the same processing parameters and width of laser beams.
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Ivashko, A. M., V. E. Kisel, and N. V. Kuleshov. "POWER SCALING IN CONTINUOUS-WAVE YB:YAG MICROCHIP LASER FOR MEASURING APPLICATIONS." Devices and Methods of Measurements 8, no. 3 (September 27, 2017): 222–27. http://dx.doi.org/10.21122/2220-9506-2017-8-3-222-227.

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Characteristics optimization of lasers used in different measuring systems is of great interest up to now. Diode-pumped microchip lasers is one of the most perspective ways for development of solid-state light sources with minimal size and weight together with low energy power consumption. Increasing of output power with good beam quality is rather difficult task for such type of lasers due to thermal effects in the gain crystal under high pump power.The investigation results of continuous-wave longitudinally diode-pumped Yb:YAG microchip laser are presented. In the presented laser radiation from multiple pump laser diodes were focused into the separate zone in one gain crystal that provides simultaneous generation of multiple laser beams. The energy and spatial laser beam characteristics were investigated.Influence of neighboring pumped regions on energy and spatial laser beams parameters both for separate and for sum laser output was observed. The dependences of laser output power from distance between neighboring pumped regions and their number were determined. Decreasing of laser output power was demonstrated with corresponding distance shortening between pumped regions and increasing their quantity with simultaneous improvement of laser beam quality.Demonstrated mutual influence of neighboring pumped regions in the longitudinally diode pumped Yb:YAG microchip laser allow as to generate diffraction limited Gaussian beam with 2W of continuous-wave output power that 30 % higher than in case of one pumped zone.
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Bingham, Robert. "Basic concepts in plasma accelerators." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 364, no. 1840 (February 2006): 559–75. http://dx.doi.org/10.1098/rsta.2005.1722.

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In this article, we present the underlying physics and the present status of high gradient and high-energy plasma accelerators. With the development of compact short pulse high-brightness lasers and electron and positron beams, new areas of studies for laser/particle beam–matter interactions is opening up. A number of methods are being pursued vigorously to achieve ultra-high-acceleration gradients. These include the plasma beat wave accelerator (PBWA) mechanism which uses conventional long pulse (∼100 ps) modest intensity lasers ( I ∼10 14 –10 16 W cm −2 ), the laser wakefield accelerator (LWFA) which uses the new breed of compact high-brightness lasers (<1 ps) and intensities >10 18 W cm −2 , self-modulated laser wakefield accelerator (SMLWFA) concept which combines elements of stimulated Raman forward scattering (SRFS) and electron acceleration by nonlinear plasma waves excited by relativistic electron and positron bunches the plasma wakefield accelerator. In the ultra-high intensity regime, laser/particle beam–plasma interactions are highly nonlinear and relativistic, leading to new phenomenon such as the plasma wakefield excitation for particle acceleration, relativistic self-focusing and guiding of laser beams, high-harmonic generation, acceleration of electrons, positrons, protons and photons. Fields greater than 1 GV cm −1 have been generated with monoenergetic particle beams accelerated to about 100 MeV in millimetre distances recorded. Plasma wakefields driven by both electron and positron beams at the Stanford linear accelerator centre (SLAC) facility have accelerated the tail of the beams.
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Sharma, Prerana. "Cross Focusing of two Coaxial Gaussian Beams with Relativistic and Ponderomotive Nonlinearity." Zeitschrift für Naturforschung A 67, no. 1-2 (February 1, 2012): 10–14. http://dx.doi.org/10.5560/zna.2011-0064.

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This paper presents the cross focusing of two high power lasers by taking off-axial contributions of the laser beams in a collisionless plasma. Due to relativistic and ponderomotive nonlinearities the two laser beams affect the dynamics of each other and cross focusing takes place. The expressions for the laser beam intensities by using the eikonal method are derived. The contributions of the r2 and r4 terms are incorporated. By expanding the eikonal and the other relevant quantities up to the fourth power of r, the solution of the pump laser beam is obtained within the extended paraxial ray approximation. Filamentary structures of the laser beams are observed due to the relativistic and the ponderomotive nonlinearity. The focusing of the laser beams is shown to become fast in the extended paraxial region. Using the laser beam and the plasma parameters, appropriate for beat wave processes, the filaments of the laser beams are studied and the relevance of these results to beat wave processes is pointed out.
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MALKA, V., A. F. LIFSCHITZ, J. FAURE, and Y. GLINEC. "GeV MONOENERGETIC ELECTRON BEAM WITH LASER PLASMA ACCELERATOR." International Journal of Modern Physics B 21, no. 03n04 (February 10, 2007): 277–86. http://dx.doi.org/10.1142/s0217979207042057.

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Laser plasma accelerators produce today ultra short, quasi-monoenergetic and collimated electron beams with potential applications in material science, chemistry and medicine. The laser plasma accelerator used to produce such an electron beam is presented. The design of a laser based accelerator designed to produce more energetic electron beams with a narrow relative energy spread is also proposed here. This compact approach should permit a miniaturization and cost reduction of future accelerators and associated X-Free Electrons Lasers (XFEL).
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Kiefer, Johannes, Anna-Lena Sahlberg, Dina Hot, Marcus Aldén, and Zhongshan Li. "Misalignment Effects in Laser-Induced Grating Experiments." Applied Spectroscopy 70, no. 12 (July 20, 2016): 2025–28. http://dx.doi.org/10.1177/0003702816653128.

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Laser-induced grating spectroscopy (LIGS) is an experimental method in which two pulsed laser beams and a continuous-wave laser beam have to be superimposed under well-defined angles to generate a coherent signal beam. In this Note, the possible effects of different forms of misalignment are examined. This includes the overlap of the pump lasers as well as the influence of the probe laser alignment on the temporal profile of the signal.
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7

Huang, Cing-Yi, Kuo-Chih Chang, and Shu-Chun Chu. "Experimental Investigation of Generating Laser Beams of on-Demand Lateral Field Distribution from Digital Lasers." Materials 12, no. 14 (July 10, 2019): 2226. http://dx.doi.org/10.3390/ma12142226.

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A new type of laser system, known as a digital laser, was proposed in 2013. Many well-known laser beams with known analytical forms have been successfully generated in digital lasers. However, for a light field that does not have an analytical form, such as a multi-point light field or a light field with an arbitrary lateral distribution, how to generate such a light field from a digital laser has not been explored. The goal of this study was to experimentally explore how to generate an on-demand lateral laser field in a digital laser. In this study, a multi-point Gaussian laser beam was successfully generated in a digital laser by both controlling the range of the laser gain and the modulation of the phase boundary of the end of the cavity. This study then generated laser beams with an on-demand lateral field distribution by generating a superimposed multi-point laser field in a digital laser. Examples of triangles, rectangles, and letter T-shaped light fields produced by digital lasers were experimentally demonstrated. In summary, this study experimentally showed that a laser beam with an on-demand lateral field distribution could be generated in a digital laser by generating a superimposed multi-point laser field in a digital laser, in which a laser gain region covering the entire intra-cavity multi-point light field and the projected SLM (spatial light modulator) modulation function adopting a mimic amplitude mask are both used.
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Varshnety, Prateek, Vivek Sajal, Prashant Chauhan, Ravindra Kumar, and Navneet K. Sharma. "Effects of transverse static electric field on terahertz radiation generation by beating of two transversely modulated Gaussian laser beams in a plasma." Laser and Particle Beams 32, no. 3 (June 10, 2014): 375–81. http://dx.doi.org/10.1017/s026303461400024x.

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AbstractResonant excitation of terahertz (THz) radiation by nonlinear coupling of two filamented spatial-Gaussian laser beams of different frequencies and wave numbers is studied in plasma having transverse static electric field. The static ponderomotive force due to filamented lasers is balanced by the pressure gradient force which gives rise to transverse density ripple, while, the nonlinear ponderomotive force at frequency difference of beating lasers couples with density ripple giving rise to stronger transverse nonlinear current which results into the excitation of THz radiation at resonance. The coupling is further enhanced by the presence of static electric field and spatial-Gaussian nature of laser beams. An increase of six-fold in the normalized amplitude of THz is observed by applying a direct current field of about 50 KV. Effects of frequency, laser beam width, and periodicity factor of modulated laser amplitude are studied for the efficient THz radiation generation. These results can be utilized for generating controlled tunable THz sources for medical applications using low filament intensities (~ 1014 W/cm2) of beating lasers.
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Raitsin, A. M., and M. V. Ulanovskii. "Correct measurement methodology spatial-energy characteristics of laser beams." Metrologiya, no. 2 (July 4, 2021): 4–19. http://dx.doi.org/10.32446/0132-4713.2021-2-4-19.

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A methodology for correct measurements of the spatial and energy characteristics of a laser beam is considered, based on the determination of the initial moments of the spatial intensity distribution in the beam cross section. The classification of radiation fields participating in the measuring process is given: emitted, measured and measured. It is shown that ISO 11146:2005 “Lasers and laser-related equipment. Test methods for laser beam widths, divergence angles and beam propagation ratios, Part 1-3” for measuring the spatial and energy characteristics of laser beams leads to incorrect measurements. This is due to the fact that the recommendations for the application of ISO 11146:2005 do not take into account the dynamic range of the used matrix radiation detectors, and the characteristics of the emitted field of interest to the user turn out to be diverging, which violates the uniformity of measurements. Moreover, the conditions ensuring the convergence of the results are practically impracticable. To solve these problems, it is proposed to establish and regulate the lower level of the dynamic range of measurements of the intensity of the used matrix receivers and to consider the spatial and energy characteristics of the emitted field of interest to the user, depending on the set value of the lower level. It is shown that measurements with this methodology become correct and make it possible to compare the characteristics of laser beams obtained by different array detectors. Formulas are given that take into account the effect of the lower level of the dynamic range of the matrix radiation detectors on the measurement result. These formulas should be recommended for inclusion in the updated edition of the national standard GOST R ISO 11146-2008 “Lasers and laser installations (systems). Methods for measuring widths, divergence angles and propagation coefficients of laser beams. Parts 1-3”.
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Adonin, A., V. Turtikov, A. Ulrich, J. Jacoby, D. H. H. Hoffmann, and J. Wieser. "Intense heavy ion beams as a pumping source for short wavelength lasers." Laser and Particle Beams 27, no. 3 (July 17, 2009): 379–91. http://dx.doi.org/10.1017/s0263034609000494.

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AbstractThe high energy loss of heavy ions in matter as well as the small angular scattering makes heavy ion beams an excellent tool to produce almost cylindrical and homogeneously excited volumes in matter. This aspect can be used to pump short wavelength lasers. For the first time, a beam of heavy ions was used to pump a short wavelength gas laser in an experiment performed at the GSI ion accelerator facility in December 2005. In this experiment, the well-known KrF* excimer laser was pumped with an intense uranium beam. Pulses of an uranium beam compressed down to 110 ns (full width at half maximum) with initial particle energy of 250 MeV per nucleon were stopped inside a gas laser cell. A mixture of an excimer laser premix gas (95.5%Kr + 0.5%F2) and a buffer gas (Ar) in different proportions was used as the laser gas. The maximum beam intensity reached in the experiment was 2.5 × 109particles per pulse, which resulted in 34 J/g specific energy deposited in the laser gas. The laser effect on the transition at λ = 248 nm has been successfully demonstrated by various independent methods. There, the laser threshold was reached with a beam intensity of 1.2 × 109particles per pulse, and the energy of the laser pulse of about 2 mJ was measured for an ion beam intensity of 2 × 109particles per pulse. As a next step, it is planned to reduce the laser wavelength down to the vacuum ultraviolet spectral region, and to proceed to the excimer lasers of the pure rare gases. The perspectives for such experiments are discussed and the detailed estimations for Xe and Kr cases are given. We believe that the use of heavy ion beams as a pumping source may lead to new pumping schemes on the higher lying level transitions and considerably shorter wavelengths, which rely on the high cross sections for multiple ionization of the target species.
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Dissertations / Theses on the topic "Lasers Laser beams"

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De, Kock Trevor Neil. "The development and evaluation of a Nd:YAG laser incorporating an unstable resonator." Thesis, Rhodes University, 1986. http://hdl.handle.net/10962/d1008566.

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Introduction: For approximately the last eight years the Laser Section of the National Physical Research Laboratory (NPRL) has been interested in inter alia, pulsed solid-state lasers and in particular, Nd:YAG. Investigations of various resonator types were undertaken with a view to the improvement of the laser parameters such as output energy, pulse width, beam quality and sensitivity to mirror misalignment. In 1980 a Nd: YAG laser employing a rotating prism Q-switch was constructed (Preussler (1980)). It involves rotating one of the two cavity reflectors so that they are parallel for only a brief instant in time. Typically the prism must rotate at a speed of 20 000 r.p.m. to ensure a single pulse output. Such lasers suffer from the tendency to emit multiple pulses, they are very noisy and they require frequent maintenance because of the short lifetime of the bearings. A resonator employing conventional curved mirrors and an electro-optical Q-switch was constructed in 1980 (Robertson & Preussler (1982)). In 1981 an electro-optically Q-swi tched laser making use of a crossed Porro-prism resonator was investigated due to its relative insensitivity to misalignment of the reflectors compared with the conventional mirror resonator (Nortier (1981)). Improvements in terms of output power, beam divergence and beam quality can be achieved by making use of a so-called unstable resonator. Such a laser has been investigated and is reported on in this study. Chapter 2 provides some background into laser theory and operation while chapter 3 deals with the theory of the unstable resonator. Chapter 4 provides details of the experimental equipment and techniques used in the work and chapter 5 discusses the evaluation of the project and results obtained.
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Singh, Abhyudai. "A mechanistic approach to tuning of MEMS resonators." Diss., Connect to online resource - MSU authorized users, 2006.

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Serkan, Mert Kirkici Hulya. "Laser beam shaping optical system design methods and their application in edge-emitting semiconductor laser-based lidar systems." Auburn, Ala., 2007. http://repo.lib.auburn.edu/2007%20Fall%20Dissertations/Serkan_Mert_22.pdf.

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Shaarawi, Mohammed Saad. "Laser chemical vapor deposition of millimeter scale three-dimensional shapes." Access restricted to users with UT Austin EID Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3023559.

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Arumugam, Anitha. "Development of method for measurement of passive losses in Cr²⁺:ZnSe and Cr²⁺:ZnS laser crystals using polarized laser beam." Birmingham, Ala. : University of Alabama at Birmingham, 2008. https://www.mhsl.uab.edu/dt/2008m/arumugam.pdf.

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Park, Gyoungwon. "GaAs-based long-wavelength quantum dot lasers /." Digital version, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3008414.

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Zhang, Tao. "Laser surface hardening of AISI 1518 alloy steel." Thesis, Nelson Mandela Metropolitan University, 2010. http://hdl.handle.net/10948/723.

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The laser surface hardening process will enhance the hardness profile of automotive components and ensure better process control and predictability of quality as compared to the conventional hardening processes. A 2KW Nd-YAG laser system was used to harden the surface of alloy steel with various process parameters (laser power, focal spot diameter and beam velocity). The results (microhardness, microstructure change and residual stress distribution) were measured and analyzed with Vickers microhardness tester, optical/electron microscope and hole-drilling residual stress equipment. Statistical analyses of the experimental data were used for explaining the relationships between process parameters, microhardness and microstructure. General thermal hardening was applied in the research to show the influence of heating temperature and cooling method on microstructure and mechanical properties. Also, the results were compared with laser surface hardening process from microhardness, microstructure and residual stress to show the advantage of laser surface hardening. Through analysis of the results of the laser surface hardening experiments, a suitable laser power density and interaction time for optimum hardening was obtained. The presented laser surface hardening process can also be applied to other alloy steel surface hardening process.
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Petkov, Theodor. "Statics and dynamics of ellipsoidal particles in laser beams." Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0878/document.

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Ce travail de thèse est une contribution au projet national AMOCOPS, financé par l’ANR. Le thème central du projet est la diffusion de lumière par des particules de formes complexes et de grandes tailles (plusieurs dizaines de µm au moins), domaine où les méthodes de simulation numérique existantes trouvent leurs limites d’applicabilité. Nous abordons le problème par le biais des effets mécaniques de la lumière, autrement dit les forces et couples créés par la pression de radiation. Etant la conséquence du transfert d’impulsion entre l’onde et la matière, ces effets sont directement liés à la diffusion de lumière. La thèse comprend une partie expérimentale –majoritaire- concernant les réponses mécaniques de particules de polystyrène de forme ellipsoïdale et d’allongement variable sous illumination par un ou deux faisceaux laser. Les cas de faisceaux faiblement focalisés (lévitation optique) et d’un faisceau très fortement focalisé (pincette optique) sont examinés successivement. Nous caractérisons différents types d’équilibre statique, certains d’entre eux non décrits auparavant, obtenus dans les deux géométries. Par ailleurs nous confirmons l’existence de réponses purement dynamiques, où la particule oscille en permanence. Trois nouveaux modes sont observés, deux dans la géométrie lévitation optique et un autre sous pincette optique. Cette étude nous permet de distinguer les oscillations dites de Simpson-Hanna dans le régime linéaire de celles non linéaires mises en évidence avant nous par Mihiretie et al..Les résultats de nos expériences sont comparés à ceux obtenus par les simulations de J.C. Loudet, sur la base de la simple optique géométrique (OG) et limitées à 2 dimensions (2d). Nous montrons que ces simulations permettent de reproduire qualitativement et comprendre physiquement la plupart des comportements observés dans nos expériences. La principale limitation de ces calculs tient à ce que l’OG ignore le caractère ondulatoire de la lumière. Pour faire mieux et aller vers des simulations fiables quantitativement, il faut développer un modèle alliant optique géométrique et optique ondulatoire. C’est la fonction du modèle VCRM (Vectorial Complex Ray Model) développé récemment par K.F. Ren en 2d. Le but du projet Amocops est de mettre au point la version 3d de la méthode et de la valider sur la base d’expériences comme celles que nous avons conduites. La deuxième partie de la thèse est consacrée à la méthode VCRM. Nous en exposons les principes, et nous présentons quelques résultats des travaux en cours avec une version intermédiaire entre 2d et 3d, dite « 2d+ ». Quelques illustrations sont proposées sur des exemples impliquant des sphères et ellipsoïdes de grandes tailles
This work is a contribution to the “AMOCOPS” project, funded by Agence Nationale de la Recherche. AMOCOPS is dedicated to the development of new computation schemes to simulate the light scattering patterns of large complexly shaped particles. Particle sizes are of the order of several 10s of micrometres, which is at the limit, or beyond the capabilities of currently available computation techniques.Our work indirectly deals with light scattering through the corresponding mechanical effects of light. Light scattering is the source of momentum transfer between light and matter, and therefore of the forces and torques acting on the exposed particles. The majority of Part A of this thesis is about the mechanical responses of ellipsoidal polystyrene particles of varying aspect ratios, under illumination by one or two laser beams. We investigate the case of weakly focused beams (optical levitation), and that of a single large aperture beam (optical tweezers). Different types of static equilibria, some of which are new, are observed and characterized in both geometries. We confirm the existence of dynamic states, whereby the particle permanently oscillates within the laser beam(s). Three new oscillation modes are observed, two of them in the conditions of optical levitation, and another one in the optical tweezer geometry. The study allows us to make a distinction between noise-driven oscillations in the linear regime, of the type predicted by Simpson and Hanna, and nonlinear oscillations such as those evidenced prior to this work, by Mihiretie et al..Results from our experiments are compared to simulations by J.C. Loudet, using simple ray-optics (RO) in two dimensions (2D). We show that results from 2D-RO qualitatively match most of our observations, and allow us to physically understand the main mechanisms at work in the observed phenomena. The simulations cannot be quantitatively exact, due to the 2D limitation, and because RO essentially ignores the wave nature of light. In Part B of the manuscript, we present the principles of the Vectorial Complex Ray Model (VCRM), which was recently developed by K.F. Ren in 2d. The goal of AMOCOPS is to develop a full 3D version of VCRM, able to simulate light scattering by particles of any shape with a smooth surface. We explain the basics of the model, as well as the “2D+” version, which is an extension of the basic 2D-VCRM. A few illustrative examples of light scattering patterns computed with 2d+-VCRM for large-sizes spheres and ellipsoids are presented
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Tovar, Anthony A. "Beam Modes of Lasers with Misaligned Complex Optical Elements." PDXScholar, 1995. https://pdxscholar.library.pdx.edu/open_access_etds/1363.

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A recurring theme in my research is that mathematical matrix methods may be used in a wide variety of physics and engineering applications. Transfer matrix techniques are conceptually and mathematically simple, and they encourage a systems approach. Once one is familiar with one transfer matrix method, it is straightforward to learn another, even if it is from a completely different branch of science. Thus it is useful to overview these methods, and this has been done here. Of special interest are the applications of these methods to laser optics, and matrix theorems concerning multipass optical systems and periodic optical systems have been generalized here to include, for example, the effect of misalignment on the performance of an optical system. In addition, a transfer matrix technique known as generalized beam method has been derived to treat misalignment effects in complex optical systems. Previous theories used numerical or ad hoc analytical solutions to a complicated diffraction integral. The generalized beam matrix formalism was also extended to higher-order beam modes of lasers and used to study mode discrimination in lasers with misaligned complex optical elements.
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Du, Plessis Anton. "A characterization of beam shaping devices and a tunable Raman laser." Thesis, Stellenbosch : University of Stellenbosch, 2003. http://hdl.handle.net/10019.1/16313.

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Thesis (MSc)--University of Stellenbosch, 2003.
ENGLISH ABSTRACT: The efficient manipulation of various nonlinear optical processes frequently requires the shaping of the laser beams used for these processes. Three beam shaping techniques were investigated in this thesis. The focussing of Gaussian laser beams was investigated analytically, in order to efficiently manipulate the focussed beam characteristics. The beam-shaping characteristics of a diffractive optical element (DOE) was investigated numerically, which illustrates the beamshaping capability of the DOE, and identifies the critical parameters in experimental situations. The use of a waveguide as beam shaping device was investigated analytically and experimentally, and characterized for use with the available tunable laser sources. A Raman laser, or Raman shifter, employs stimulated vibrational Raman scattering to generate laser radiation at shifted frequencies. The waveguide was successfully applied as a beam shaping device in the Raman laser system, for optimisation of the process. The Raman laser system was investigated experimentally and characterized for use with the available tunable laser sources. The successful generation of laser radiation at shifted frequencies illustrates the usefulness of the system for generating tunable red-shifted frequencies. The results of this work allow the simple and efficient application of the Raman laser to generate laser radiation at shifted frequencies, in particular tunable infrared laser radiation which is desirable for molecular spectroscopy.
AFRIKAANSE OPSOMMING: Nie-liniêre optiese prosesse kan meer effektief benut word deur die vervorming van die laserbundels wat gebruik word in die prosesse. In hierdie tesis word drie laserbundel-vervormings tegnieke ondersoek. Die fokussering van Gaussiese laserbundels word analities ondersoek, om die gefokusseerde bundel se eienskappe effektief te manipuleer. Die bundel-vervormings eienskappe van ’n diffraktiewe optiese element word numeries ondersoek, wat die effektiwiteit van die bundelvervorming en die sensitiewe parameters in die sisteem uitwys. Die gebruik van ’n golfgeleier as ’n bundel-vervormings tegniek word ook analities en eksperimenteel ondersoek, en gekarakteriseer vir gebruik met die gegewe golflengte-verstelbare laser sisteme. ’n Raman laser, wat gestimuleerde vibrasionele Raman verstrooiing gebruik om laser lig te genereer by Stokes-verskuifde frekwensies, word ondersoek. Die golfgeleier word effektief gebruik as ’n bundel-vervormings tegniek in die Raman laser, om die bogenoemde nie-liniêre proses te optimeer. Die Raman laser was eksperimenteel ondersoek en gekarakteriseer vir gebruik met die gegewe golflengte-verstelbare lasers. Laser lig by verskuifde golflengtes is suksesvol gegenereer, wat die bruikbaarheid van die sisteem illustreer. Van belang is spesifiek verstelbare infrarooi laser lig, wat gebruik kan word in die laser-spektroskopie van molekules. Die resultate van hierdie werk lei tot die eenvoudige en effektiewe gebruik van die Raman laser, om langer golflengtes in die infrarooi gebied te genereer met ’n gegewe laser in die sigbare gebied.
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Books on the topic "Lasers Laser beams"

1

Pyatakhin, M. V. Spatiotemporal characteristics of laser emission. Commack, N.Y: Nova Science Pub., 1994.

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Farley, Dixie. Laser treatment to go: Outpatient uses of healing light abound. Rockville, Md: Dept. of Health and Human Services, Public Health Service, Food and Drug Administration, Office of Public Affairs, 1988.

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Ananʹev, I︠U︡riĭ Alekseevich. Laser resonators and the beam divergence problem. Bristol: Adam Hilger, 1992.

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Gao, Chunqing. Characterization and transformation of astigmatic laser beams. Berlin: Wissenschaft und Technik Verlag, 1999.

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1935-, Weber Horst, ed. Laser resonators and beam propagation: Fundamentals, advanced concepts and applications. 2nd ed. New York: Springer, 2005.

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M, Kane D., ed. Laser cleaning II. Hackensack, NJ: World Scientific, 2006.

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A, Gabriel Don, ed. Laser light scattering. New York: Dover, 1994.

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Morris, Timothy, and Eckhard Beyer. High power laser materials processing: Lasers, beam delivery, diagnostics, and applications : 24-26 January 2012, San Francisco, California, United States. Edited by SPIE (Society). Bellingham, Wash: SPIE, 2012.

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9

Kudryashov, Alexis V. Laser resonators, microresonators, and beam control XIV: 22-25 January 2012, San Francisco, California, United States. Edited by SPIE (Society). Bellingham, Wash: SPIE, 2012.

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Kudryashov, Alexis V. Laser resonators and beam control XI: 26-27 January 2009, San Jose, California, United States. Bellingham, Wash: SPIE, 2009.

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Book chapters on the topic "Lasers Laser beams"

1

Svelto, Orazio. "Properties of Laser Beams." In Principles of Lasers, 475–504. Boston, MA: Springer US, 2009. http://dx.doi.org/10.1007/978-1-4419-1302-9_11.

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Svelto, Orazio. "Properties of Laser Beams." In Principles of Lasers, 379–410. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4615-7670-9_7.

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Svelto, Orazio. "Properties of Laser Beams." In Principles of Lasers, 463–92. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4757-6266-2_11.

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Jüptner, W., R. Rothe, Th Kreis, and G. Sepold. "Diagnostics of High-Power Laser Beams." In Gas Flow and Chemical Lasers, 338–45. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-71859-5_51.

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Jüptner, W., R. Rothe, and G. Sepold. "Mirror Optics for High-Power Laser Beams." In Gas Flow and Chemical Lasers, 72–81. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-71859-5_13.

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Bollanti, S., P. Lazzaro, F. Flora, G. Giordano, T. Letardi, D. Murra, C. Petrucci, G. Schina, O. Uteza, and C. E. Zheng. "Experimental and Theoretical Results of High Optical Quality Excimer Laser Beams." In High Power Lasers — Science and Engineering, 191–98. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-015-8725-9_12.

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Korolenko, P. V. "Laser Beams with Helical Wavefront Dislocations and their Applications in the Diagnostical and Metrological Systems." In Gas Lasers - Recent Developments and Future Prospects, 241–48. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-0235-0_20.

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Minty, Michiko G., and Frank Zimmermann. "Cooling." In Particle Acceleration and Detection, 263–300. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-08581-3_11.

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AbstractMany applications of particle accelerators require beam cooling, which refers to a reduction of the beam phase space volume or an increase in the beam density via dissipative forces. In electron and positron storage rings cooling naturally occurs due to synchrotron radiation, and special synchrotron-radiation damping rings for the production of low-emittance beams are an integral part of electron-positron linear colliders. For other types of particles different cooling techniques are available. Electron cooling and stochastic cooling of hadron beams are used to accumulate beams of rare particles (such as antiprotons), to combat emittance growth (e.g., due to scattering on an internal target), or to produce beams of high quality for certain experiments. Laser cooling is employed to cool ion beams down to extremely small temperatures. Here the laser is used to induce transitions between the ion electronic states and the cooling exploits the Dopper frequency shift. Electron beams of unprecedentedly small emittance may be obtained by a different type of laser cooling, where the laser beam acts like a wiggler magnet. Finally, designs of a future muon collider rely on the principle of ionization cooling. Reference [1] gives a brief review of the principal ideas and the history of beam cooling in storage rings; a theoretical dicussion and a few practical examples can be found in [2].
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Poprawe, Reinhart, Konstantin Boucke, and Dieter Hoffman. "Laser Beams." In Tailored Light 1, 111–39. Berlin, Heidelberg: Springer Berlin Heidelberg, 2018. http://dx.doi.org/10.1007/978-3-642-01234-1_5.

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Kotlyar, V. V., A. A. Kovalev, and A. P. Porfirev. "A Spiral Phase Plate for an Optical Vortices Generation." In Vortex Laser Beams, 1–43. Boca Raton : Taylor & Francis, a CRC title, part of the Taylor & Francis imprint, a member of the Taylor & Francis Group, the academic division of T&F Informa, plc, 2018.: CRC Press, 2018. http://dx.doi.org/10.1201/9781351009607-1.

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Conference papers on the topic "Lasers Laser beams"

1

Gao, C., H. Weber, and M. Gao. "Characterization of laser beams by using intensity moments." In ICO20:Lasers and Laser Technologies, edited by Y. C. Chen, Dianyuan Fan, Chunqing Gao, and Shouhuan Zhou. SPIE, 2006. http://dx.doi.org/10.1117/12.667325.

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Rodas-Verde, María I., Humberto Michinel, Gaspar D. Montesinos, and Víctor M. Pérez-García. "Stable propagation of pulsed beams in Kerr focusing media with modulated dispersion." In ICO20:Lasers and Laser Technologies, edited by Y. C. Chen, Dianyuan Fan, Chunqing Gao, and Shouhuan Zhou. SPIE, 2005. http://dx.doi.org/10.1117/12.667167.

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Ding, Guilin, Xiao Yuan, Wanlin Wang, Feng Zhao, Jun Zhou, and Hongbing Yao. "Twisted-free ten-parameter family of partially coherent general anisotropic Gaussian Schell model (TF-AGSM) beams." In ICO20:Lasers and Laser Technologies, edited by Y. C. Chen, Dianyuan Fan, Chunqing Gao, and Shouhuan Zhou. SPIE, 2006. http://dx.doi.org/10.1117/12.667332.

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Sparkes, Martin, Walter Perrie, William M. Steen, and Peter J. Modern. "Automatic laser beam positioning for high-power CO 2 laser beams using high-reflective transmissive optics." In Europto High Power Lasers and Laser Applications V, edited by Eckhard Beyer, Maichi Cantello, Aldo V. La Rocca, Lucien D. Laude, Flemming O. Olsen, and Gerd Sepold. SPIE, 1994. http://dx.doi.org/10.1117/12.184726.

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Masychev, Victor I., Vladislav S. Alejnikov, and Valentin K. Sysoev. "Low-power instability of multiline CO lasers." In Intense Laser Beams and Applications. SPIE, 1993. http://dx.doi.org/10.1117/12.145229.

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Amarande, Stefan. "Approximation of super-Gaussian beams by generalized flattened Gaussian beams." In XI International Symposium on Gas Flow and Chemical Lasers and High Power Laser Conference. SPIE, 1997. http://dx.doi.org/10.1117/12.270255.

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Hu, J., and H. L. Tsai. "Fluid Flow and Weld Pool Dynamics in Dual-Beam Laser Keyhole Welding." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-41711.

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The use of dual or multiple laser beams is necessary for welding thick-section metals, especially for Nd:Yag lasers which are limited to relatively low power as compared to CO2 lasers. It was also reported that the use of dual laser beams for welding can increase keyhole stability leading to a better weld quality. So far, the development of dual-beam laser welding technologies has been in the experimental stage. The objective of this paper is to develop mathematical models and the associated numerical techniques to calculate the transient heat transfer and fluid flow in the weld pool and to study weld pool dynamics during the dual-beam laser welding process. The simulation was conducted for a three-dimensional stationary dual-beam laser welding. A very interesting change of the top-surface view of the weld pool was predicted. During the welding process, the top-view shape of the weld pool changes, starting from an oval-shape with the long-axis connecting the centers of the two laser beams, to a circle, and finally to an oval-shape with the short-axis connecting the centers of the two laser beams. Although a direct comparison with published experimental observation is impossible (due to the lack of detailed experimental data), the predicted weld pool shape is similar to that observed from experiments. The dynamical change of the weld pool shape can be well explained by the predicted fluid flow field.
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Pfotenhauer, S., O. Jackel, K. U. Amthor, H. Schwoerer, B. Liesfeld, W. Ziegler, R. Sauerbrey, K. W. D. Ledingham, and T. Esirkepov. "Monoenergetic proton beams from laser plasmas." In 2006 Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference. IEEE, 2006. http://dx.doi.org/10.1109/cleo.2006.4628445.

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Culpepper, Mark A. "Coherent combination of fiber laser beams." In High-Power Lasers and Applications, edited by Alexis V. Kudryashov. SPIE, 2002. http://dx.doi.org/10.1117/12.469476.

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Heebner, John, Michael Borden, Phil Miller, Chris Stolz, Tayyab Suratwala, Paul Wegner, Mark Hermann, et al. "A programmable beam shaping system for tailoring the profile of high fluence laser beams." In Laser Damage Symposium XLII: Annual Symposium on Optical Materials for High Power Lasers, edited by Gregory J. Exarhos, Vitaly E. Gruzdev, Joseph A. Menapace, Detlev Ristau, and M. J. Soileau. SPIE, 2010. http://dx.doi.org/10.1117/12.867728.

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Reports on the topic "Lasers Laser beams"

1

Roberson, Stephen, and Paul Pellegrino. Compression of Ultrafast Laser Beams. Fort Belvoir, VA: Defense Technical Information Center, March 2016. http://dx.doi.org/10.21236/ad1006025.

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2

Schiffer, J. P., J. S. Hangst, and J. S. Nielsen. Laser-cooled continuous ion beams. Office of Scientific and Technical Information (OSTI), August 1995. http://dx.doi.org/10.2172/166363.

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Fernandez, Juan C. Applications of laser-driven ion beams. Office of Scientific and Technical Information (OSTI), November 2013. http://dx.doi.org/10.2172/1104907.

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Hangst, Jeffrey Scott. Laser cooling of a stored ion beam: A first step towards crystalline beams. Office of Scientific and Technical Information (OSTI), September 1992. http://dx.doi.org/10.2172/10138609.

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Hangst, J. S. Laser cooling of a stored ion beam: A first step towards crystalline beams. Office of Scientific and Technical Information (OSTI), September 1992. http://dx.doi.org/10.2172/6731343.

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Cousineau, Sarah, Alexander Aleksandrov, Yun Liu, David Jonson, and Timofey Gorlov. Laser Stripping for High Intensity Proton Beams. Office of Scientific and Technical Information (OSTI), July 2018. http://dx.doi.org/10.2172/1496019.

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Ross, Marc C. LASER-BASED PROFILE MONITOR FOR ELECTRON BEAMS. Office of Scientific and Technical Information (OSTI), May 2003. http://dx.doi.org/10.2172/813156.

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Leong, K. H. Modeling laser beam-rock interaction. Office of Scientific and Technical Information (OSTI), July 2003. http://dx.doi.org/10.2172/822584.

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Hall, John L. Precision Atomic Beam Laser Spectroscopy. Fort Belvoir, VA: Defense Technical Information Center, February 1999. http://dx.doi.org/10.21236/ada360672.

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Cowan, T., T. Ditmire, and G. LeSage. Intense Laser - Electron Beam Interactions. Office of Scientific and Technical Information (OSTI), February 2000. http://dx.doi.org/10.2172/802605.

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