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Dissertations / Theses on the topic 'Lasing'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Wille, Marcel, Evgeny Krüger, Steffen Blaurock, et al. "Lasing in cuprous iodide microwires." American Institute of Physics, 2017. https://ul.qucosa.de/id/qucosa%3A23549.

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We report on the observation of lasing in cuprous iodide (CuI) microwires. A vapor-phase transport growth procedure was used to synthesize CuI microwires with low defect concentration. The crystal structure of single microwires was determined to be of zincblende-type. The high optical quality of single microwires is indicated by the observed series of excitonic emission lines as well as by the formation of gain under optical excitation. Lasing of triangular whispering-gallery modes in single microwires is demonstrated for fs- and ns-excitation from cryogenic temperatures up to 200 K. Timeresol

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2

Li, Zairui. "Room Temperature Lasing in GeSn Alloys." University of Dayton / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1450105363.

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3

Spracklen, Edmund Francis. "Inner shell lasing via electron collisional ionisation." Thesis, University of York, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.442366.

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4

Szymanska, Marzena Hanna. "Bose condensation and lasing in optical microstructures." Thesis, University of Cambridge, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.620345.

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5

Ding, Pengji. "Lasing effect in femtosecond filaments in air." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLX053/document.

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La filamentation laser femtoseconde dans l'air est un phénomène qui implique une riche famille d'effets optiques non linéaires. Effet laser de filaments a émergé comme un phénomène nouveau en 2011. Il a été activement étudiée au cours des dernières cinq années, non seulement en raison de ses applications potentielles dans les techniques de télédétection mais aussi la physique pour découvrir. Cette thèse est consacrée principalment à l'étude de deux types d'effets laser à partir du plasma filamentaire généré par 800 nm impulsions laser femtosecondes dans l'air ou l'azote pur. Le premier est l'é

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6

Losio, Paolo Antonio. "Charge transport and mirrorless lasing in organic semiconductors." Zürich : ETH, 2007. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17492.

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7

McLaren-Jones, Jennifer Sian Elizabeth. "Band edge lasing in chiral nematic liquid crystals." Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/288382.

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For the last 20 years, there has been considerable interest in chiral nematic liquid crystal band edge lasers. The birefringent molecules of chiral nematic liquid crystals form a periodic helical structure, which results in a photonic bandgap for circularly polarised light with the same sense of rotation as the helix. A large increase in effective gain is seen for a fluorescent gain medium within the liquid crystal at the band edges, resulting in lasing. Applications of liquid crystal lasers could include miniature medical diagnostic tools, large-area holographic laser displays, and environmen

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8

Buscemi, Giuseppe. "Nanocrystals for resonance energy transfer and lasing applications." Thesis, University of Southampton, 2015. https://eprints.soton.ac.uk/426882/.

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The work at hand is structured into four chapters, the first of which is this introduction. An appendix explains a small experiment on a different topic of research that differs from the core of this thesis. The second chapter explains the physics of semiconductor crystals and semiconductor nanostructures. Introduces the mathematical framework to describe the exciton in semiconductor nanostructures. Chapter three outlines the mechanism of RET and is dedicated to the experimental and theoretical methods we employed during our research. We present the technique that has allowed us to perform a R

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9

Laferriere, Patrick. "Gain Dynamics of the N2+ Air Laser." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/38025.

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Lasing from femtosecond laser filaments is a relatively new field of study that has been studied since its first observation in 2003. Such lasing effect is of interest to the scientific community due to its possible application in remote sensing. This thesis studies the lasing dynamics of the excited molecular nitrogen ion N2+ which emits primarily at 391 nm and 428 nm wavelengths. We start by studying the ellipticity dependence of the gain from filaments in ambient air. We then study the ellipticity dependence in a vacuum in a supersonic gas jet to remove the complexity of filamentation. We s

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10

Sirigu, Lorenzo. "Stimulated emission and lasing in one-dimensional electronic systems /." [S.l.] : [s.n.], 2002. http://library.epfl.ch/theses/?nr=2604.

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11

Wenzlik, Daniel [Verfasser]. "Liquid crystalline cellulose derivatives for mirrorless lasing / Daniel Wenzlik." Mainz : Universitätsbibliothek Mainz, 2013. http://d-nb.info/1034878859/34.

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12

Christopoulos, S. "Lasing and BEC of microcavity polaritons at elevated temperatures." Thesis, University of Cambridge, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.597666.

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We investigate the room temperature polaritons dynamics of wide bandgap semiconductor microcavities. Our efforts are focused on microcavities based on wide bandgap semiconductors, such as GaN and ZnO, which possess large exciton binding energies and consequently exhibit enormous Rabi splittings, ensuring the thermal stability of excitons even at room temperature. In this context, the strong coupling regime is indeed observed for the first time in a hybrid bulk GaN microcavity at room temperature. The polaritonic properties are studied with a range of spectroscopic techniques and reveal the occ

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13

Karl, Markus. "Living lasers : lasing from biological and biocompatible soft matter." Thesis, University of St Andrews, 2018. http://hdl.handle.net/10023/16400.

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In recent years, the study of stimulated emission from and by biological systems has gained wide spread attention as a promising technology platform for novel biointegrated laser. However, the photonic properties and the associated physics of many biological laser systems are not yet fully understood and many promising resonator architectures and laser classes have not yet transitioned into the biological world. In this thesis, we investigate the fundamental photonic properties of lasers based on single biological cells and explore the potential of distributed feedback (DFB) gratings as novel

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14

Wille, Marcel, Tom Michalsky, Evgeny Krüger, Marius Grundmann, and Rüdiger Schmidt-Grund. "Absorptive lasing mode suppression in ZnO nano- and microcavities." American Institute of Physics, 2016. https://ul.qucosa.de/id/qucosa%3A23548.

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We conclusively explain the different lasing mode energies in ZnO nano- and microcavities observed by us and reported in literature. The limited penetration depth of usually used excitation lasers results in an inhomogeneous spatial gain region depending on the structure size and geometry. Hence, weakly or even nonexcited areas remain present after excitation, where modes are instantaneously suppressed by excitonic absorption. We compare the effects for ZnO microwires, nanowires, and tetrapod-like structures at room temperature and demonstrate that the corresponding mode selective effect is mo

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15

Michalsky, Tom, Marcel Wille, Christof P. Dietrich, et al. "Phonon-assisted lasing in ZnO microwires at room temperature." American Institute of Physics, 2014. https://ul.qucosa.de/id/qucosa%3A31211.

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We report on room temperature phonon-assisted whispering gallery mode (WGM) lasing in ZnO microwires. For WGM laser action on the basis of the low gain phonon scattering process high quality resonators with sharp corners and smooth facets are prerequisite. Above the excitation threshold power PTh of typically 100 kW/cm2, the recombination of free excitons under emission of two longitudinal optical phonons provides sufficient gain to overcome all losses in the microresonator and to result in laser oscillation. This threshold behavior is accompanied by a distinct change of the far and near field

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16

Yu, Zhangwei. "Fibre Bragg Grating Components for Filtering, Switching and Lasing." Doctoral thesis, Stockholm : Mikroelektronik och tillämpad fysik, Kungliga Tekniska högskolan, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4896.

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17

Velkov, Yasen. "Quantum nuclear dynamics in x-ray scattering and lasing." Doctoral thesis, Stockholm : Bioteknologi, Kungliga Tekniska högskolan, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-9728.

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18

Geburt, Sebastian [Verfasser]. "Lasing and ion beam doping of semiconductor nanowires / Sebastian Geburt." Jena : Thüringer Universitäts- und Landesbibliothek Jena, 2013. http://d-nb.info/1034073818/34.

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19

Su, Zhan Ph D. Massachusetts Institute of Technology. "Advanced silicon photonic microcavities for routing, detection and lasing applications." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/108845.

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Thesis: Ph. D. in Electrical Engineering, Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, February 2017.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (pages 155-167).<br>The theoretical background of microcavities for photonic applications has been extensively investigated in theory over the past two decades. These structures provide the ability

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20

Gaio, Michele. "Light emission in complex networks from single-photons to lasing." Thesis, King's College London (University of London), 2016. https://kclpure.kcl.ac.uk/portal/en/theses/light-emission-in-complex-networks-from-singlephotons-to-lasing(137751c8-fa87-48da-90d0-c632168636e9).html.

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Light-matter interaction, which is at the heart of the science and technology of light, can be controlled and designed in materials structured at the nanometre length-scale, for enhanced light emission and absorption, and down to the single photon level. The aim of this thesis is to investigate complex photonic geometries, i.e. systems where the collective interaction of a large number of constituents denes the optical properties with emergent phenomena beyond the sum of the response of the individual constituents. In particular, a central topic is the emission of light from sources located in

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21

Chauhan, Sumanyu. "Random lasing with resonant feedback in freestanding blue-phase microspheres." Kent State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=kent1586771560757746.

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22

Höfner, Michael. "Lasing and strong coupling in inorganic and organic photonic structures." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2016. http://dx.doi.org/10.18452/17519.

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Diese Arbeit beschäftigt sich mit der Untersuchung der starken Kopplung und Laseremission in Strukturen, die ZnO, ZnCdO oder organische Moleküle als aktives Material enthalten. Die ZnCdO basierten Vielfachquantengräben erreichen ihre Laserschwelle durch optische Ruckkopplung an streuenden Luftlöchern. Diese Emitter nennt man random laser. Die Dynamik ihrer Emission unter quasi-stationären Bedingungen ist der hier gezeigte Fokus. Hoch reproduzierbare Anregungen werden verwendet um sowohl die Dynamik eines einzelnen Beschusses aber auch die Unterschiede verschiedener Anregungen zu untersuchen. D

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23

De, Simoni Giorgio. "From anti-bunching to lasing: planar junctions in semiconductor heterostructures." Doctoral thesis, Scuola Normale Superiore, 2013. http://hdl.handle.net/11384/85866.

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24

Barlow, Guy F. "Analysis and design of organic semiconductor lasers." Thesis, Bangor University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.340445.

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25

Fake, Michael. "The effect of intra-cavity reflections on optical fibre amplifier performance." Thesis, University of Essex, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388155.

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26

Sartor, Janos [Verfasser], and H. [Akademischer Betreuer] Kalt. "Random Lasing in nanokristallinen ZnO-Pulvern / Janos Sartor. Betreuer: H. Kalt." Karlsruhe : KIT-Bibliothek, 2012. http://d-nb.info/1020230029/34.

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27

O'Neill, Domhnail M. "Soft x-ray lasing in laser-induced plasmas : an experimental study." Thesis, Queen's University Belfast, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335448.

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28

Wah, Jiing-Yeh. "Top Hat HELLISH (Hot electron light emitting and lasing in heterostructures)." Thesis, University of Essex, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.274381.

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29

Mischok, Andreas, Robert Brückner, Hartmut Fröb, Vadim G. Lyssenko, and Karl Leo. "Photonic lattices in organic microcavities: Bloch states and control of lasing." SPIE, 2015. https://tud.qucosa.de/id/qucosa%3A35053.

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Organic microcavities comprising the host:guest emitter system Alq3:DCM offer an interesting playground to experimentally study the dispersion characteristics of laterally patterned microlasers due to the broad emission spectrum and large oscillator strength of the organic dye. By structuring of metallic or dielectric sublayers directly on top of the bottom mirror, we precisely manipulate the mode structure and in fluence the coherent emission properties of the device. Embedding silver layers into a microcavity leads to an interaction of the optical cavity-state in the organic layer and the ne

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30

Ji, Kaiwen. "Exceptional Points Bifurcations and Zero Mode Lasing in Coupled Nanolaser Arrays." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASP167.

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La conservation de l'énergie façonne notre compréhension de la réalité. Néanmoins, ce principe peut être violé lorsqu’on considère un sous-système où l'énergie peut être échangée avec l'environnement externe. Un tel scénario physique peut être décrit par un Hamiltonien non-Hermitien présentant un spectre d'énergies complexes. L'étude des systèmes non-Hermitiens a connu des avancées remarquables depuis la découverte de la symétrie Parité-Temps (PT). Dans un tel système PT-symétrique, une singularité, appelée point exceptionnel (EP), a récemment suscité une attention considérable. Dans les systè

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31

Davuluri, Subrahmanya Bhima Sankar. "Effects of Quantum Coherence and Interference." Thesis, University of North Texas, 2013. https://digital.library.unt.edu/ark:/67531/metadc500094/.

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Quantum coherence and interference (QCI) is a phenomenon that takes place in all multi-level atomic systems interacting with multiple lasers. In this work QCI is used to create several interesting effects like lasing without inversion (LWI), controlling group velocity of light to extreme values, controlling the direction of propagation through non-linear phase matching condition and for controlling the correlations in field fluctuations. Controlling group velocity of light is very interesting because of many novel applications it can offer. One of the unsolved problems in this area is to achie

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32

Li, Yun. "Design of Laser Structures and Configurations With Solution Processed Active Materials." Thesis, The University of Sydney, 2022. https://hdl.handle.net/2123/29883.

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Major hurdles currently stunt progress into current-injection organic solid-state lasers. Degradation at the high excitation densities required to achieve lasing must be addressed if such devices are to ever see commercialization. To realize suitable active materials, increased throughput in material screening is necessary to accelerate the progress in material development. Beyond active material developments, sub-optimal waveguide and resonator design can hinder the maximum laser performance. An understanding of the structure to threshold relationship is therefore critical to minimize thresh

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33

Lohmeyer, Henning. "Optischer Einschluss, Lasing und Purcell-Effekt in Mikrosäulenkavitäten auf Basis breitlückiger Halbleiter." Berlin : Mensch- & -Buch-Verl, 2007. http://d-nb.info/994636245/34.

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34

Rahachou, Aliaksandr. "Theoretical studies of microcavities and photonic crystals for lasing and waveguiding applications." Licentiate thesis, Norrköping : Linköpings universitet, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-7482.

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35

Kim, Hun [Verfasser]. "Organic lasing: correlation between molecular structure, optical and optoelectronic properties / Hun Kim." Mainz : Universitätsbibliothek Mainz, 2013. http://d-nb.info/1043936122/34.

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36

Großmann, Tobias [Verfasser], and H. [Akademischer Betreuer] Kalt. "Whispering-Gallery-Mode Lasing in Polymeric Microcavities / Tobias Großmann. Betreuer: H. Kalt." Karlsruhe : KIT-Bibliothek, 2012. http://d-nb.info/1032243082/34.

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37

Adams, Richard Andrew. "Time resolved photoluminescence studies of the lasing mechanisms in II-VI semiconductors." Thesis, University of Oxford, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360020.

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38

Lyu, Chunhai [Verfasser], and Christoph H. [Akademischer Betreuer] Keitel. "Narrow-band hard-x-ray lasing / Chunhai Lyu ; Betreuer: Christoph H. Keitel." Heidelberg : Universitätsbibliothek Heidelberg, 2018. http://d-nb.info/1177252597/34.

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39

Sposito, Alberto. "Pulsed laser deposition of thin film magneto-optic materials and lasing waveguides." Thesis, University of Southampton, 2014. https://eprints.soton.ac.uk/364136/.

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The aim of this thesis was to study and improve the properties of optical materials deposited by the film growth technique called Pulsed Laser Deposition (PLD), a relatively fast, inexpensive and versatile deposition method using a laser to ablate a target and transfer material on top of a substrate. The materials of interest were titanium-doped sapphire (Ti:sapphire or Ti:Al2O3) for fabrication of compact, low-loss, high-efficiency and high-power waveguide lasers, which could be also operated in ultra-fast highrepetition-rate pulsed mode, and magneto-optic garnets, e.g. yttrium iron garnet (Y

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40

Robert, Cédric. "Study of III-V nanostructures on GaP for lasing emission on Si." Thesis, Rennes, INSA, 2013. http://www.theses.fr/2013ISAR1913/document.

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Ce travail de thèse porte sur l’étude de nanostructures semi- conductrices III-V pour le développement d’émetteurs laser sur silicium dans une approche pseudomorphique. Une croissance en accord de maille d’alliages à base de GaP ou plus précisément de nitrures dilués GaPN doit garantir une faible densité de défauts cristallins. Le modèle des liaisons fortes à base étendue est tout d’abord présenté afin de simuler les propriétés électroniques et optiques de structures semi-conductrices sur substrats de GaP ou Si. Les propriétés des alliages massifs GaPN et GaAsPN sont étudiées par des expérienc

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41

Bouteyre, Paul. "Lasers à pérovskites hybrides halogénées en microcavité." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLN069/document.

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Depuis 2012, les pérovskites hybrides halogénées de type CH3NH3PbX3 (X = I, Br ou Cl) sont apparues comme très prometteuses non seulement dans le domaine du photovoltaïque mais aussi pour les dispositifs émetteurs de lumière comme les diodes électroluminescentes et les lasers. L'un des avantages cruciaux de ces matériaux semiconducteurs est leur méthode de déposition à basse température et en solution. Le réglage de la longueur d'onde d'émission des pérovskites dans tout le spectre visible par de simples substitutions chimiques dans la partie halogénée est un autre atout. En particulier, les p

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42

Kok, Mang Hin. "Fluorescence and lasing in dye-doped 1D photonic bandgap structures from dichromated gelatin /." View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?PHYS%202007%20KOK.

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43

Sundar, Vikram C. (Vikram Chandraseker) 1975. "Novel II-IV semiconductor nanocrystal gain media : from amplified spontaneous emission to lasing." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/8177.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 2002.<br>Includes bibliographical references.<br>This thesis details efforts in using cadmium selenide (CdSe) nanocrystallites (NCs) as a novel lasing media. We begin with the synthesis of polymer/NC composites, in which the NCs are stabilized within a long-chain methacrylate polymer. This chapter serves to highlight the processing flexibility afforded by the NCs as well as some of the salient linear optical properties of NCs. The wide range of colors that are accessible using these NCs and the ability to excite them s

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44

Mohammadi, Fatemesadat. "Photon Emission and Lasing in Bare and Hybrid Plasmonic Semiconductor Nanowires and Nanorods." University of Cincinnati / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin153538145368204.

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45

Harankahage, Dulanjan Padmajith Dharmasena. "Quantum Confinement Beyond the Exciton Bhor Radius in Quantum Dot Nanoshells." Bowling Green State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1593955468720583.

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46

Frank, Regine [Verfasser]. "Microscopic Theory of Random Lasing and Light Transport in Amplifying Disordered Media / Regine Frank." Bonn : Universitäts- und Landesbibliothek Bonn, 2011. http://d-nb.info/1016111398/34.

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47

Florescu, Lucia. "Lasing in strongly scattering dielectric microstructures." 2004. http://link.library.utoronto.ca/eir/EIRdetail.cfm?Resources__ID=80229&T=F.

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48

"Lasing characteristics of non-spherical cavities." 2000. http://library.cuhk.edu.hk/record=b6073315.

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Pu Xiao-Yun.<br>"December 2000."<br>Thesis (Ph.D.)--Chinese University of Hong Kong, 2000.<br>Includes bibliographical references.<br>Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web.<br>Mode of access: World Wide Web.<br>Abstracts in English and Chinese.

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49

Wang, Cih-Su, and 王慈甦. "Lasing properties of TiO2/ZnO nanocomposites." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/93662725864747811756.

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碩士<br>國立臺灣大學<br>應用物理所<br>99<br>An improvement in random lasing action at ultraviolet wavelength has beenachieved from ZnO nanorod arrays grown on sapphire substrate with the assistance of TiO2 nanoparticles. Due to the inherent nature of high refractive index of TiO2 (n ~2.5)> ZnO(n~1.9), the TiO2 nanoparticles can serve efficiently as excellent nanoscatterers,which can promote the formation of closed-loop paths. In addition, the underlying origin of the pronounced lasing action can also be attributed to the enhanced emission arising from fluorescence resonance energy transfer (FRET) between t

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50

He, Yi-Ning, and 何依嚀. "Fabrication and lasing characteristics of GaN nanopillars." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/02644858072319249485.

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碩士<br>國立交通大學<br>光電工程學系<br>98<br>In this study, we studied GaN nanopillars structure fabricated by combined two methods top-approch and bottom-approch. The sample of GaN nanopillars etched down by ICP-RIE with Ni nano mask ,then regrowth GaN passivation layer in the sidewalls. The spotsize dependent photoluminescence (PL), and angle-resolved PL and low temperature were performed to investigate the optical properties of the GaN nanopillars. This research intends to investigate the lasing characteristics of GaN nanopillars under optical pumping. GaN nanopillars has lower threshold power densi

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