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Dissertations / Theses on the topic 'Laguerre- Gaussian'

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Published: 4 June 2021
Last updated: 1 February 2022

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1

Kampouridis, Anastasios. "Laguerre-Gaussian modes in the free electron laser." Thesis, Monterey, Calif. : Naval Postgraduate School, 2007. http://bosun.nps.edu/uhtbin/hyperion-image.exe/07Jun%5FKampouridis.pdf.

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Thesis (M.S. in Physics)--Naval Postgraduate School, June 2007.<br>Thesis Advisor(s): William B. Colson, Robert L. Armstead. "June 2007." Includes bibliographical references (p. 71-72). Also available in print.
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2

Thaller, Kristian. "Optical cooling of solids and Laguerre-Gaussian mode generation." Thesis, University of Southampton, 2011. https://eprints.soton.ac.uk/336048/.

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This thesis covers two areas of laser physics: optical cooling of rare-earth-doped solids by anti-Stokes fluorescence and the generation of pure Laguerre-Gaussian laser modes using a ring-shaped pump beam. A novel laser-based approach to determining local variations in the temperature of transparent samples is developed. This technique is based on monitoring the frequency-shift of the axial modes of a simple, diode-pumped solid-state laser resonator in which the sample is placed. A theoretical resolution of <4.5mK is calculated for a perfectly isolated probe resonator. The technique is validat
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3

Santiago, Condori Jordy Guilbert. "Non-collinear interaction of Laguerre-Gaussian modes in second harmonic generation." Master's thesis, Pontificia Universidad Católica del Perú, 2018. http://tesis.pucp.edu.pe/repositorio/handle/123456789/12114.

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Esta tesis aborda las interacciones no colineales de los modos Laguerre-Gaussianos. Estas interacciones se utilizan para lograr la transferencia del momento angular orbital (OAM) en la mezcla de ondas no lineales. Esto se hace mediante conmutación controlada por polarización. Ajustando la geometría de los haces de entrada, es posible producir una salida OAM de tres canales con cargas topológicas arbitrarias que se generan simultáneamente y se resuelven espacialmente en la longitud de onda del segundo armónico. El uso de grados de libertad de trayectoria y polarización permite una conmutación
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4

VanValkenburgh, Michael James. "Hermite / Laguerre-Gaussian modes & lower bounds for quasimodes of semiclassical operators." Diss., Restricted to subscribing institutions, 2009. http://proquest.umi.com/pqdweb?did=1905663061&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.

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5

Zhang, Weiya. "Effect of a thin optical Kerr medium on a Laguerre-Gaussian beam and the applications." Online access for everyone, 2006. http://www.dissertations.wsu.edu/Dissertations/Fall2006/W_Zhang_121306.pdf.

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6

Cabrera, Gutiérrez Naty Citlali. "Modes de Laguerre-Gauss et canalisation d’atomes froids." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112360/document.

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Les modes de Laguerre-Gauss sont une des solutions de l’équation de propagation de la lumière dans l’approximation paraxiale en coordonnées cylindriques. Ces modes sont caractérisés par deux indices (azimutal et radial) et présentent des propriétés particulières : une structure en forme d’anneau et une phase en hélice. Ces propriétés ont été mises au profit pour plusieurs applications allant de la microscopie à l’astronomie. Cette thèse a été dédiée à l’étude de ces modes et à leur application dans le domaine des atomes froids. Dans un premier temps, la pureté des modes fabriqués par la méthod
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7

Ruys, Wesley da Silva. "Classes de hipersuperfícies Weingarten generalizadas tipo Laguerre." Universidade Federal de Goiás, 2017. http://repositorio.bc.ufg.br/tede/handle/tede/8082.

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Submitted by Franciele Moreira (francielemoreyra@gmail.com) on 2017-12-27T13:50:44Z No. of bitstreams: 2 Tese - Wesley da Silva Ruys - 2017.pdf: 2660976 bytes, checksum: 3c6402ac0974e65da560b50e1f65b52e (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)<br>Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2017-12-28T09:42:07Z (GMT) No. of bitstreams: 2 Tese - Wesley da Silva Ruys - 2017.pdf: 2660976 bytes, checksum: 3c6402ac0974e65da560b50e1f65b52e (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)<br>Made available
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8

Paufler, Willi [Verfasser], Stephan [Gutachter] Fritzsche, Jan-Michael [Gutachter] Rost, and Andrey [Gutachter] Surzhykov. "High-harmonic generation with Laguerre-Gaussian beams / Willi Paufler ; Gutachter: Stephan Fritzsche, Jan-Michael Rost, Andrey Surzhykov." Jena : Friedrich-Schiller-Universität Jena, 2020. http://d-nb.info/1212509161/34.

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9

Paquet, Romain. "Nouvelles sources lasers pour génération THz." Thesis, Montpellier, 2016. http://www.theses.fr/2016MONTS017.

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Cette thèse porte sur la conception, la réalisation et l'étude expérimentale d'une source laser bifréquence de haute cohérence émettant à 1 µm en vue d'obtenir par photomélange un émetteur THz. Nous nous intéressons plus particulièrement aux lasers à semiconducteur émettant par la surface en cavité externe verticale (VeCSEL), l'objectif étant d'obtenir un fonctionnement laser bifréquence robuste en régime continu, basé sur la coexistence simultanée de deux modes transverses de Laguerre-Gauss. La sélection de seulement deux modes transverses est réalisée grâce à des masques de pertes insérés in
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10

Sevilla, Carlos Andres. "Direct Observation of Conservation of Orbital Angular Momentum in Collinear Type-I Spontaneous Parametric Down-Conversion." University of Dayton / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1543326773239719.

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11

McLaren, Melanie. "Tailoring quantum entanglement of orbital angular momentum." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/95868.

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Thesis (PhD)--Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: High-dimensional quantum entanglement offers an increase in information capacity per photon; a highly desirable property for quantum information processes such as quantum communication, computation and teleportation. As the orbital angular momentum (OAM) modes of light span an infinite-dimensional Hilbert space, they have become frontrunners in achieving entanglement in higher dimensions. In light of this, we investigate the potential of OAM entanglement of photons by controlling the parameters in both the generation and m
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12

Bolze, Tom [Verfasser], Patrick [Gutachter] Nürnberger, Tobias [Gutachter] Brixner, and Tobias [Gutachter] Hertel. "Photodynamics of a fluorescent tetrazolium salt and shaping of femtosecond Laguerre-Gaussian laser modes in time and space / Tom Bolze ; Gutachter: Patrick Nürnberger, Tobias Brixner, Tobias Hertel." Würzburg : Universität Würzburg, 2018. http://d-nb.info/1160877025/34.

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13

Chappuis, Céline. "Génération d'harmoniques d'ordre élevé à deux faisceaux portant du moment angulaire." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS022/document.

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La génération d’harmoniques d’ordre élevé est un processus d’interaction lumière-matière hautement non-linéaire permettant la synthèse d’impulsions sub-femtosecondes, dites attosecondes (1 as = 10⁻¹⁸ s). Mes travaux de thèse portent sur l’étude du transfert de moment angulaire lors de ce processus, afin de contrôler les caractéristiques spatiales et de polarisation du rayonnement émis dans l’extrême ultraviolet. Comme pour la matière, le moment angulaire de la lumière peut être séparé en une composante de spin, associée à l’état de polarisation du faisceau, et une composante orbitale, reliée à
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14

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 libe
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15

Gherardi, David Mark. "Studies of particle and atom manipulation using free space light beams and photonic crystal fibres." Thesis, St Andrews, 2009. http://hdl.handle.net/10023/703.

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16

Granata, Massimo. "Développements optiques pour les détecteurs d'ondes gravitationnelles de deuxième et troisième génération: cavités de recyclage pour Advanced Virgo et modes de Laguerre-Gauss d'ordre supérieur." Phd thesis, Université Paris-Diderot - Paris VII, 2011. http://tel.archives-ouvertes.fr/tel-00665858.

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Les ondes gravitationnelles sont des perturbations de l'espace-temps qui pourraient être détectées par un interféromètre de Michelson avec cavités Fabry-Perot. Plusieurs interféromètres sont à présent en opération: LIGO, Virgo, GEO. Ces instruments ont atteint leur sensibilité nominale et ont accompli plusieurs acquisitions de données scientifiques. Aucune détection n'a été reportée. Advanced Virgo, Advanced LIGO et LCGT sont les projets d'amélioration de sensibilité des détecteurs actuels d'un ordre de grandeur. Ces instruments, dont la construction est en cours, permettront la première détec
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17

Tsow, Tsing Wai Francis. "Representing arbitrary beam shapes in terms of Laguerre-Gaussian modes." 1997. http://catalog.hathitrust.org/api/volumes/oclc/37537991.html.

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Thesis (M.S.)--University of Wisconsin--Madison, 1997.<br>Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leav 54).
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18

Wang, Li-Wen, and 王立文. "The study of polarization states of superposed Laguerre-Gaussian beams." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/7b4cg3.

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碩士<br>國立臺灣師範大學<br>物理學系<br>105<br>It has been more than fifty years that laser was invented, because of the properties of laser are not common with the general light. By the rapid development of technology not only the laser has a great applications in many other fields but also more thorough and wide we know about laser than before. Laser has many different kinds of properties like coherent, polarization, distribution of intensity and concentrated energy. We focus on the laser modes, superposed modes and both the distribution of polarization in this topic. Using the method of numerical simula
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19

賀政浩. "Selective three-dimensional superposed Laguerre-Gaussian modes in c-cut Nd：YVO4 laser cavities." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/18463616787289225255.

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碩士<br>國立臺灣師範大學<br>物理學系<br>102<br>The laser cavity system mentioned in the thesis is different from the traditional solid state laser. We can manipulate the pump offset to generate a variety of the laser beams with complex spatial structures. We investigate the geometric beams generated from a c-cut Nd:YVO4 laser. The Nd:YVO4 acts as a birefringence crystal. In this work, we focused on six spots of the circular geometric mode. In the far field, the structured laser beam is left-handed circularly polarized and right-handed circularly polarized at the same time. This particular property has many
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20

Tsai, Chih-Wei, and 蔡智惟. "Selective generation of radically and azimuthally polarized Laguerre-Gaussian beam in Nd:YAG laser." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/32269008821243732406.

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碩士<br>逢甲大學<br>光電學系<br>103<br>The purpose of this thesis is to construct a selective generation of radically (RP) and azimuthally polarized (AP) Laguerre-Gaussian beam by using a diode-end-pumping Nd:YAG laser and a spot-defect cavity. The spot defect can suppress the generation of Hermite-Gaussian modes. The thermal induced bifocusing of Nd:YAG can help to select RP and AP beams at different pump power. Two Cr coated spot-defects, 50 and 100 μm in diameter, were used. A flat/flat cavity resonated at 1.06 μm was constructed and the cavity length was kept around 2 cm. At 5.64 W diode pump power,
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21

Tsai, Yu-Wen, and 蔡裕雯. "The study of using hemi-cylindrical cavity to generate high-order superposed Laguerre-Gaussian modes." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/43407945606635141267.

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碩士<br>國立臺灣師範大學<br>物理學系<br>103<br>In 1993 M. W. Beijersbergen and L. Allen found when Hermite-Gaussian modes pass through a pair of cylindrical lens which can change the phase of light, Laguerre-Gaussian modes would be generated. We combined hemi-spherical cavity and a pair of cylindrical lens to set up a hemi-cylindrical cavity. In our experiment, we verified that astigmatic Hermite-Gaussian modes can be generated from hemi-cylindrical cavity, and can convert to Laguerre-Gaussian modes by using an extra-cavity cylindrical lens. In degenerate hemi–cylindrical cavity, by controlling the pump of
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22

Bolze, Tom. "Photodynamics of a fluorescent tetrazolium salt and shaping of femtosecond Laguerre-Gaussian laser modes in time and space." Doctoral thesis, 2018. https://nbn-resolving.org/urn:nbn:de:bvb:20-opus-160902.

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This thesis will outline studies performed on the fluorescence dynamics of phenyl-benzo- [c]-tetrazolo-cinnolium chloride (PTC) in alcoholic solutions with varying viscosity using time-resolved fluoro-spectroscopic methods. Furthermore, the properties of femtosecond Laguerre-Gaussian (LG) laser pulses will be investigated with respect to their temporal and spatial features and an approach will be developed to measure and control the spatial intensity distribution on the time scale of the pulse. Tetrazolium salts are widely used in biological assays for their low oxidation and reduction thresho
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23

Chanu, Sapam Ranjita. "High-Resolution Spectroscopy in Atoms Using Coherent Control." Thesis, 2014. http://etd.iisc.ernet.in/handle/2005/2730.

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The subject of this thesis is the study of coherent interaction of light with matter (atoms) to improve the precision measurements and techniques. Special attention is drawn to get the narrow subnatural electromagnetically induced transmission (EIT), electromagnetically induced absorption (EIA) and nonlinear magneto-optic rotation (NMOR) caused by alkali atoms contained in a vapor cell. Subnatural polarization rotation introduces by a strong circularly polarized light in the absence of any external magnetic field was also studied. A detailed theoretical treatment, given in this dissertation, a
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