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Dissertations / Theses on the topic 'Fiber laser amplifier'

Author: Grafiati
Published: 4 June 2021
Last updated: 26 July 2025

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1

Currey, Ronnie. "Investigation of Specialized Laser and Optical Techniques to Improve Precision Atomic Spectroscopy of Helium." Thesis, University of North Texas, 2020. https://digital.library.unt.edu/ark:/67531/metadc1703412/.

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The aim of this thesis is to develop both Yb and Tm fiber laser sources with all fiber cavities. Both wavelength ranges provide useful laser sources for optical pumping of helium. The goal is to develop Tm laser sources operating at 2058 nm to optically quench 3He (2058.63 nm) and 4He (2058.69 nm) singlets (21S0). We also have developed Yb laser sources at 1083 nm to optical pump the triplet states of helium and laser cool an atomic beam of helium.
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2

Zhou, Renjie. "Developments of Narrow-Linewidth Q-switched Fiber Laser, 1480 nm Raman Fiber Laser, and Free Space Fiber Amplifier." Thesis, The University of Arizona, 2011. http://hdl.handle.net/10150/202931.

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In the first chapter, a Q-switched fiber laser that is capable of generating transform-limited pulses based on single-frequency fiber laser seeded ring cavity is demonstrated. The output pulse width can be tuned from hundreds of nanoseconds to several microseconds. This Q-switched ring cavity fiber laser can operate over the whole C-band. In addition, a theoretical model is developed to numerically study the pulse characteristics, and the numerical results are in good agreements with the experimental results. In the next chapter, a Raman fiber laser is developed for generating signal at 1480 n
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3

Song, Jiawei, and Jiawei Song. "Nd-doped Fiber Lasers and Fiber Amplifiers at 9xx nm." Thesis, The University of Arizona, 2016. http://hdl.handle.net/10150/620827.

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The lasers operating in the wavelength range of 900 - 1000 nm have caused intense attention because they are in great demands for: 1. Highpower blue and deep UV laser generation 2. High power single-mode pump laser source 3. Light detection and Lidar , etc. And now, there are actually many different types of lasers can generate laser in this wavelength range. For example, Nd and Yb doped fiber laser, Nd and Yb doped glass and crystal lasers, OPO and SHG laser, etc. Among all this options, we decided to study the Nd-doped fiber laser for their outstanding advantages: 1. As fiber laser, it posse
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4

Oppermann, Patrick [Verfasser]. "Characterization and stabilization of a high power fiber amplifier laser / Patrick Oppermann." Hannover : Technische Informationsbibliothek (TIB), 2017. http://d-nb.info/1136882707/34.

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5

Willis-Ott, Christina. "Ytterbium-doped fiber-seeded thin-disk master oscillator power amplifier laser system." Doctoral diss., University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5890.

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Lasers which operate at both high average power and energy are in demand for a wide range of applications such as materials processing, directed energy and EUV generation. Presented in this dissertation is a high-power 1 ?m ytterbium-based hybrid laser system with temporally tailored pulse shaping capability and up to 62 mJ pulses, with the expectation the system can scale to higher pulse energies. This hybrid system consists of a low power fiber seed and pre-amplifier, and a solid state thin-disk regenerative amplifier. This system has been designed to generate high power temporally t
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6

Natile, Michele. "High-repetition rate CEP-stable Yb-doped fiber amplifier for high harmonic generation." Electronic Thesis or Diss., Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS149.

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Depuis une vingtaine d’années, la physique attoseconde, via le phénomène de génération d’harmoniques d’ordres élevés (HHG), a permis de nombreuses avancées dans la compréhension des phénomènes de dynamique ultra-rapide. Les lasers femtoseconde émettant des impulsions de fortes énergies et de durées de quelques cycles optiques sont les outils indispensables à cette physique. De plus, la phase entre la porteuse et l’enveloppe (CEP) des impulsions doit être contrôlée. Récemment les lasers basés sur les fibres dopées ytterbium ont permis de transposer les expériences d’HHG à haute cadence. La stab
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7

Natile, Michele. "High-repetition rate CEP-stable Yb-doped fiber amplifier for high harmonic generation." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS149.

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Depuis une vingtaine d’années, la physique attoseconde, via le phénomène de génération d’harmoniques d’ordres élevés (HHG), a permis de nombreuses avancées dans la compréhension des phénomènes de dynamique ultra-rapide. Les lasers femtoseconde émettant des impulsions de fortes énergies et de durées de quelques cycles optiques sont les outils indispensables à cette physique. De plus, la phase entre la porteuse et l’enveloppe (CEP) des impulsions doit être contrôlée. Récemment les lasers basés sur les fibres dopées ytterbium ont permis de transposer les expériences d’HHG à haute cadence. La stab
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8

Leigh, Matthew. "HIGH POWER PULSED FIBER LASER SOURCES AND THEIR USE IN TERAHERTZ GENERATION&#8194." Diss., The University of Arizona, 2008. http://hdl.handle.net/10150/193797.

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In this dissertation I report the development of high power pulsed fiber laser systems. These systems utilize phosphate glass fiber for active elements, instead of the industry-standard silica fiber. Because the phosphate glass allows for much higher doping of rare-earth ions than silica fibers, much shorter phosphate fibers can be used to achieve the same gain as longer silica fibers.This single-frequency laser technology was used to develop an all-fiber actively Q-switched fiber lasers. A short cavity is used to create large spacing between longitudinal modes. Using this method, we demon
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9

Lesparre, Fabien. "Amplificateurs impulsionnels à base de fibres cristallines dopées Ytterbium." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLO001/document.

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Les lasers à impulsions ultra-courtes (< 10 ps) ont largement démontré leur intérêt pour de nombreuses applications scientifiques, industrielles ou encore médicales. Le domaine du micro-usinage par impulsions laser est l'un des domaines les plus actifs du moment. Les dernières avancées en la matière privilégient deux axes de recherche, l'augmentation du taux de répétition associé à de fortes puissances moyennes et une montée en énergie. Nos travaux s'inscrivent dans ce contexte et visent à développer des amplificateurs d'impulsions ultracourtes innovants à base de fibres cristallines Yb:YAG
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10

Tison, Guillaume. "Étude, réalisation et applications d’une chaîne amplificatrice laser compacte pour l’allumage de turbomoteurs." Thesis, Bordeaux 1, 2013. http://www.theses.fr/2013BOR14779/document.

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Ce travail porte sur l’étude et la réalisation d’une cellule d’allumage laser pour turbomoteurs. Une étude bibliographique nous a permis d’identifier les caractéristiques nécessaires : des impulsions nanosecondes d’au moins 10mJ. La spécificité de l’application impose de nombreuses contraintes qui ont influencé le choix d’une architecture avec deux étages amplificateurs : un amplificateur fibré suivi d’un amplificateur à base de fibre cristalline. Nous avons développé un code permettant de simuler l’amplification d’une impulsion nanoseconde dans ces milieux et ainsi déterminé les caractéristiques techn
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11

Malik, Bilal Hameed. "Erbium-doped fiber ring laser tuning using an intra-cavity Fabry-Perot filter." [College Station, Tex. : Texas A&M University, 2006. http://hdl.handle.net/1969.1/ETD-TAMU-1779.

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12

Guiraud, Germain. "Développement de sources laser à fibres dopées ytterbium haute puissance, monofréquence et à bas bruit d'intensité." Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0648.

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Les sources laser à fibre, haute puissance et de faible largeur spectrale sont de plus en plus utiles pour des applications à la fois industrielle et scientifique. Cependant, le développement de ces sources est limité par les seuils d’apparition d’effets non-linéaires tels que la Diffusion Brillouin Stimulée (DBS) du fait d’un fort confinement de la lumière dans le coeur de la fibre. Un premier amplificateur en régime monofréquence de puissance moyenne égale à 50W a été développé à partir d’une diode laser signal de 50 mW. L’étude du bruit d’intensité sur cet amplificateur a montré que l’utili
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13

Gaida, Christian. "Peak Power Scaling of Nanosecond Pulses in Thulium based Fiber Lasers." Master's thesis, University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5742.

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Thulium based fiber lasers represent a promising alternative for pulse energy scaling and high peak power generation with ytterbium based systems at 1 micrometer. Advantages of thulium arise from the operation at longer wavelengths and a large gain bandwidth (1.8-2.1 m icrometer). Nonlinear effects, such as self phase modulation, stimulated Raman scattering and stimulated Brillouin scattering generally limit peak power scaling in fiber lasers. The longer wavelength of thulium fiber lasers and large mode field areas can significantly increase the nonlinear thresholds. Compared to 1 m sys
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14

Guichard, Florent. "Combinaison cohérente d'impulsions femtoseconde - Optimisation des performances des amplificateurs fibrés ultracourts." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLO001.

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Les lasers à fibre optique délivrant des impulsions femtoseconde sont aujourd'hui utilisés dans de nombreuses applications scientifiques ou industrielles. Pour étendre l'éventail de ces applications, l'augmentation des performances en termes de durée, énergie par impulsion, et puissance moyenne délivrée par ces sources a fait l'objet de nombreux développements. Ce travail a pour objectif d'utiliser l'idée de combinaison cohérente d'impulsions femtoseconde dans le but de poursuivre l'amélioration des caractéristiques des amplificateurs à fibre ultrabrefs selon deux axes.La première partie est c
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15

Kim, Kyungbum. "ALL-SEMICONDUCTOR HIGH POWER MODE-LOCKED LASER SYSTEM." Doctoral diss., University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2482.

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The objective of this dissertation is to generate high power ultrashort optical pulses from an all-semiconductor mode-locked laser system. The limitations of semiconductor optical amplifier in high energy, ultrashort pulse amplification are reviewed. A method to overcome the fundamental limit of small stored energy inside semiconductor optical amplifier called "eXtreme Chirped Pulse Amplification (X-CPA)" is proposed and studied theoretically and experimentally. The key benefits of the concept of X-CPA are addressed. Based on theoretical and experimental study, an all-semiconductor mode-locked
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16

Wei, Li-Wei. "Système laser de haute-puissance pour le projet Advanced Virgo : les amplificateurs à fibre combinés de façon cohérente." Thesis, Nice, 2015. http://www.theses.fr/2015NICE4091/document.

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Virgo est un interféromètre de Michelson dont les bras contiennent des cavités Fabry-Perot. Il a été construit pour détecter directement les ondes gravitationnelles. Le projet Advanced Virgo est une amélioration majeure de Virgo pour atteindre une sensibilité encore plus élevée avec laquelle la détection des ondes gravitationnelles deviendra probable. On prévoit un système laser mono-fréquence de 175 Watts de puissance optique présentant des stabilités accrues pour le bruit relatif de puissance et pour le bruit de fréquence. Ce travail de thèse a pour objet la réalisation de ce système laser d
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17

Jouanno, Jean-Marc. "Amplification optique dans des guides d'ondes réalises par échange d'ions dans des verres phosphates dopes par des terres rares." Grenoble INPG, 1995. http://www.theses.fr/1995INPG0013.

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Les amplificateurs optiques realises a partir de fibres dopees par des ions erbiums ont fait, grace a leurs bonnes performances, fortement evoluer les systemes de transmission a fibre optique. Nous en avons transpose les principes pour realiser des composants actifs d'optique integree sur des verres dopes par des terres rares. Cette technologie permet en effet une meilleure compacite et l'insertion simultanee de fonctions variees. Nous presentons les resultats obtenus dans des guides fabriques par echange ionique dans des verres phosphates. Les ions de terres rares, inclus des la synthese du m
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18

Pierrot, Simonette. "Propagation non linéaire et amplification d'impulsions picosecondes dans des fibres microstructurées dopées ytterbium." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4026/document.

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Intensivement étudié depuis son apparition en 1960, le laser est un outil qui a su trouver sa place au-delà du monde académique : ses performances uniques l'ont rendu indispensable dans nombres d'applications de la vie courante. Les particularités les plus attractives du rayonnement laser sont la directivité de son émission, et le caractère quasi-monochromatique de son rayonnement.La première permet de propager un faisceau laser sur des longues distances, et également de concentrer la lumière sur des cibles aux dimensions extrêmement réduites : on parle de cohérence spatiale de l'émission lase
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19

Riou, Fabienne. "Modélisation et caractérisation d'un amplificateur optique à semiconducteurs avec adaptateurs de mode." Saint-Etienne, 1994. http://www.theses.fr/1994STET4002.

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Ce mémoire traite de la conception et de la caractérisation d'un amplificateur optique à semiconducteurs dans lequel sont inclus des adaptateurs de mode. L'idée est ici de modifier la structure guidante afin de faciliter le couplage entre le mode guide de l'amplificateur et celui d'une fibre standard. Pour cela, le guide est affiné, dans ses parties terminales, au moyen de marches gravées. Ainsi, le mode guide est déconfiné, ce qui lui permet de s'élargir et d'être plus adapté au mode guide de la fibre. Dans un premier temps, un modèle décrivant la propagation du mode le long d'un guide plan p
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20

Bai, Jinxu. "High Power High Energy Ytterbium-doped Fiber Amplifier System." Research Showcase @ CMU, 2016. http://repository.cmu.edu/dissertations/728.

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Fiber amplifiers with high power and high pulse energy are strongly in demand for both scientific research and industrial applications. Ytterbium-doped fiber has been an outstanding choice for its broad-gain bandwidth and excellent power conversion efficiencies. In this dissertation, we introduced a compact high power high pulsed energy laser system with chirally coupled core (3C) Yb-doped fibers as the gain media. Traditional standard fibers and photonic crystal fibers are not suitable for compact high power high pulse energy laser systems because of poor higher order modes (HOMs) management
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21

Suzuki, Shigeru. "Optical Fiber Devices: Novel Fiber Lasers and Image Amplifier." Diss., The University of Arizona, 2008. http://hdl.handle.net/10150/194910.

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Three fiber based optical devices: all phosphate glass fiber laser, single hybrid mode fiber laser, and fiber image amplifier, were investigated in this dissertation. Phosphate fiber Bragg grating (FBG) is desired to improve performance of recently developed high power single frequency lasers that were based on highly rare earth ion doped phosphate fibers because these lasers were fabricated with silica FBGs that have incompatible properties with standard phosphate glasses. Since standard phosphate glasses are not photosensitive, Ge-doped phosphate glasses were fabricated and their UV-photosen
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22

Fu, Shijie, Guannan Shi, Quan Sheng, et al. "Dual-wavelength fiber laser above 2 mu m based on cascaded single mode-multimode-single mode structures." IEEE, 2016. http://hdl.handle.net/10150/622786.

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A stable dual-wavelength Tm:Ho co-doped fiber laser operating above 2 mu m based on cascaded single mode-multimode-single mode (SMS) all-fiber structures has been proposed and experimentally demonstrated for the first time.
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23

Zhu, Xiushan. "Multimode Interference in Optical Fibers and Its Applications in Fiber Lasers and Amplifiers." Diss., The University of Arizona, 2008. http://hdl.handle.net/10150/195318.

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Multimode interference (MMI) in optical fibers has been studied and its applications in optical fiber lasers and amplifiers have been proposed and demonstrated in this thesis. When a single-mode fiber is spliced onto a multimode fiber, quasi-reproduction of the field from the single-mode fiber, also called “self-imaging”, occurs periodically along the multimode fiber where the phase differences between the strongly excited modes are very small. The properties of self-imaging in multimode optical fibers have been investigated experimentally and theoretically in this thesis. Key parameters for t
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24

Li, Qin, and 李沁. "All-fiber laser sources for fiber optical parametric amplifiers in 1 um." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B47175898.

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Fiber optical parametric amplifier (FOPA) is undoubtedly one of the most thriving research topics about optical amplifiers during the past decades. The high optical gain, arbitrary gain regions and wavelength conversion with large frequency shift make FOPA outstanding in diverse application areas like the high-speed all-optical communication, wavelength-tunable laser sources and optical imaging systems. Special fiber gain medium and proper pump source are two essential elements in an FOPA setup. As the research interest on FOPAs has recently gradually extended from the conventional 1.5-_m reg
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25

Zhu, Yanjun. "Novel fibre lasers and amplifiers." Thesis, King's College London (University of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.392685.

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26

Mears, Robert Joseph. "Optical fibre lasers and amplifiers." Thesis, University of Southampton, 1987. https://eprints.soton.ac.uk/396453/.

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This thesis describes the development and characterisation of single-mode optical fibre lasers and amplifiers. Although the fibre laser configuration was first employed over twenty years ago, its application to conventional optical fibre technology has not been demonstrated previously. The new devices are based on single-mode fibres doped with rare-earth ions, notably neodymium and erbium. The combination of strong absorption bands, long fluorescence lifetimes; low fibre losses in the infra-red and small fibre cores have made possible very low threshold and efficient fibre lasers. Experiments
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27

Shalibeik, Hotan. "Rare-earth-doped fiber lasers and amplifiers." Göttingen Cuvillier, 2007. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=016360105&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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28

Mart, Cody W., and Cody W. Mart. "Characterization and Power Scaling of Beam-Combinable Ytterbium-Doped Microstructured Fiber Amplifiers." Diss., The University of Arizona, 2017. http://hdl.handle.net/10150/625641.

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In this dissertation, high-power ytterbium-doped fiber amplifiers designed with advanced waveguide concepts are characterized and power scaled. Fiber waveguides utilizing cladding microstructures to achieve wave guidance via the photonic bandgap (PBG) effect and a combination of PBG and modified total internal reflection (MTIR) have been proposed as viable single-mode waveguides. Such novel structures allow larger core diameters (>35 μm diameters) than conventional step-index fibers while still maintaining near-diffraction limited beam quality. These microstructured fibers are demonstrated as
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29

Chestnut, David Alexander. "Fibre lasers and amplifiers with nonlinearity." Thesis, Imperial College London, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.410006.

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30

Gapontsev, Denis Valentinovitch. "Fiber Raman lasers and amplifiers and their applications." Thesis, Imperial College London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.322403.

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31

Chan, Jaclyn Su Phin. "Power scaling concepts in fiber lasers and amplifiers." Thesis, University of Southampton, 2011. https://eprints.soton.ac.uk/300420/.

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Fiber lasers and amplifiers have undergone rapid development in the past two decades, evidenced by the almost exponential rise in their output powers. This project investigates various concepts relating to high-power operation of fiber sources, focussing particularly on mode-area scaling, with the goal of developing a strategy for further power-scaling of fiber sources. The first concept examined is the phenomena of multimode interference (MMI), which occurs when fiber core areas are scaled to the extent that they support the propagation of more than one mode. MMI gives rise to self-imaging, w
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32

Wu, Jingwei, Xiushan Zhu, Valery Temyanko, LaComb L. Valery, R. A. Norwood, and N. Peyghambarian. "Power scaling of single-frequency fiber amplifiers at 976 nm." IEEE, 2016. http://hdl.handle.net/10150/622788.

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Cladding pumped single-frequency Yb3+-doped fiber amplifiers at 976 nm were investigated. Over 4 W output power was obtained and further power scaling can be achieved by reducing the cladding diameter of the Yb3+-doped fiber.
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33

Hu, Yongdan. "High-concentration erbium-doped glasses, fiber amplifiers and lasers." Diss., The University of Arizona, 2001. http://hdl.handle.net/10150/279804.

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Upconversion coefficients in a new high-concentration erbium-doped tellurite glass were obtained a schematic study of experiments and modeling. The upconversion coefficient for ⁴I₁₃/₂ + ⁴I₁₃/₂ → ⁴I₉/₂ + ⁴I₁₅/₂ is found to be 2.74 x 10⁻¹⁸ cm³/s and for ⁴I₁₁/₂ + ⁴I₁₁/₂ → ⁴I₁₅/₂ + ²F₇/₂ is 1.09 x 10⁻¹⁸ cm³/s. The performance of high concentration Er³⁺+-Yb³⁺ -codoped phosphate fiber amplifiers and the performance of a high-power Er³⁺-Yb³⁺-codoped phosphate fiber laser were presented. From a 3.6cm-long fiber, 18 dB internal gain i.e. 5 dB/cm, for small signal input at 1535 nm, was achieved. With
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34

Heilmann, Anke. "Highly scalable femtosecond coherent beam combining system of high power fiber amplifiers." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLX112/document.

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Allier de fortes puissances moyennes et crêtes donne accès à un champ applicatif très large pour un système laser ultrarapide. Une technique qui s’est avérée capable de satisfaire ces exigences est la combinaison cohérente de faisceaux (CBC). Elle permet de séparer spatialement les faisceaux avant l’amplification pour les recombiner ensuite d’une manière cohérente en un unique faisceau. Afin d’obtenir une recombinaison efficace, les propriétés spatiales et spectrales de tous les faisceaux doivent être parfaitement en accord.Pour des applications comme l’accélération de particules, le recours à
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35

Han, Jiho. "Phase modulated fibre amplifier array for high power real-time arbitrary beam shaping." Thesis, University of Cambridge, 2017. https://www.repository.cam.ac.uk/handle/1810/267906.

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36

Fallnich, Carsten. "Diode-pumped ultrafast fiber lasers and amplifiers for precision applications." [S.l.] : [s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=981637965.

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37

Haxsen, Frithjof [Verfasser]. "Ultrashort pulse thulium-doped fiber lasers and amplifiers / Frithjof Haxsen." Hannover : Technische Informationsbibliothek und Universitätsbibliothek Hannover (TIB), 2013. http://d-nb.info/1035469146/34.

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38

Thipparapu, Naresh Kumar. "Development of bi-doped fibre amplifiers and lasers & broadband Er-doped multi-element fibre amplifiers." Thesis, University of Southampton, 2018. https://eprints.soton.ac.uk/423478/.

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The demand for fibre optic communication is continuously increasing over the years. This is due to the increased accessibility to the World Wide Web using internet of things. The capacity of current fibre optic communication through the single mode fibre is limited by the amplification bandwidth of Er-doped fibres. To increase the capacity of fibre optic communication research community around the world are proposing different approaches. One of them is to use the low loss window (1260-1625nm) of silica optical fibres by developing efficient fibre amplifiers and lasers. Another one is to use n
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39

Ye, Chen Chun. "Spectroscopy of erbium-doped fibre amplifiers and lasers." Thesis, University of Southampton, 1995. https://eprints.soton.ac.uk/399077/.

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This thesis describes work done in investigating Er3+-doped fibre amplifiers and lasers, with emphasis on the spectral properties and diagnosis of ion-ion interaction processes in the glasses and fibres. Ion-pair upconversion and uniform upconversion in Er3+-doped silicate fibres have been directly and separately observed for the first time, by examining upconversion fluorescence. An upper limit to the Er3+ ion-pair lifetime of a few microseconds has been determined. Different effects of the two upconversion mechanisms on the 1.54µm fluorescence have been examined. Ion-pair upconversion in an
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40

Movassaghi, Mahan. "Characterization and modeling of erbium-doped fiber amplifiers and impact of fiber dispersion on semiconductor laser noise." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0016/NQ56592.pdf.

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41

Magne, Sylvain. "Etat de l'art des lasers à fibre : étude d'un laser à fibre dopée ytterbium et spectroscopie laser de fibres dopées." Saint-Etienne, 1993. http://www.theses.fr/1993STET4027.

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Cette thèse montre l'intérêt de l'amplification optique et des lasers à fibres dopées par des ions de terres-rares pour l'instrumentation et les capteurs à fibres optiques. Nous détaillons les avantages et les inconvénients d'une telle technologie placée dans son contexte d'optique intégrée, ainsi que ses perspectives d'utilisation. Apres rappel de la théorie de la propagation guidée dans les fibres optiques, les technologies permettant de réaliser des fibres optiques dopées sont décrites. Une étude comparative des méthodes d'analyses de préformes et de fibres dopées permettant de déterminer l
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42

Barnard, Chris. "Properties and applications of rare-earth doped fiber amplifiers and lasers." Thesis, University of Ottawa (Canada), 1994. http://hdl.handle.net/10393/6507.

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An analytical model for two-, three-, and four-level system rare-earth-doped fiber amplifiers and lasers is presented. Fiber amplifier gain is expressed in terms of easily measured attenuation coefficients, intrinsic saturation powers, and cross saturation powers at the pump and signal wavelengths. System-independent formulas are given for the slopes and thresholds of ring and linear fiber lasers. Good agreement between theory and experiment is shown for erbium-doped fiber amplifiers and lasers and thulium-doped fiber lasers. Approximate system-independent solutions are also given for fiber am
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43

Takayanagi, Jun, Norihiko Nishizawa, Hiroyuki Nagai, Makoto Yoshida, and Toshio Goto. "Generation of high-power femtosecond pulse and octave-spanning ultrabroad supercontinuum using all-fiber system." IEEE, 2005. http://hdl.handle.net/2237/6770.

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44

Zhu, Gongwen. "Q-switched and Mode-locked Mid-IR Fiber Lasers." Diss., The University of Arizona, 2015. http://hdl.handle.net/10150/578593.

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Mid-infrared (IR) lasers (2-12 μm) have found tremendous applications in medical surgeries, spectroscopy, remote sensing, etc. Nowadays, mid-IR emissions are usually generated from semiconductor lasers, gas lasers, and solid-state lasers based on nonlinear wavelength conversion. However, they usually have disadvantages including poor beam quality, low efficiency, and complicated configurations. Mid-IR fiber lasers have the advantages of excellent beam quality, high efficiency, inherent simplicity, compactness, and outstanding heat-dissipating capability, and have attracted significant interest
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45

Wu, Jingwei, Xiushan Zhu, Valery Temyanko, et al. "Yb^3+-doped double-clad phosphate fiber for 976 nm single-frequency laser amplifiers." OPTICAL SOC AMER, 2017. http://hdl.handle.net/10150/624035.

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Highly ytterbium (Yb3+)-doped double-clad phosphate fiber was fabricated for the investigation of power scaling of a 976 nm single-frequency laser. Over 3 W single-frequency laser output power was obtained with gain fibers shorter than 10 cm. Our experimental results show that Yb3+-doped phosphate fiber is a promising gain medium for 976 nm laser amplifiers. (C) 2017 Optical Society of America
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46

Carter, Jeremy Nigel. "Investigations of rare earth doped fluorozirconate fibre lasers and amplifiers." Thesis, University of Southampton, 1992. https://eprints.soton.ac.uk/399360/.

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This thesis presents the results of a three year study into the use of thulium and praseodymium doped fluorozirconate fibres as low threshold, potentially miniature laser sources at a variety of wavelengths from the visible to the infrared. Thulium doped fluorozirconate fibre is also investigated as a high gain optical amplifier at 810nm. Pumped at the semiconductor diode compatible wavelength of 790nm, laser emission has been demonstrated at 1.9µm, 2.3µm, 1.47µm and 810nm in thulium doped fluorozirconate fibres, with diode pumped operation achieved at 1.91µm. The transition at 810nm has been
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47

Zhang, S. L. "Optical amplifiers for fibre communications : modelling and system performance assessment." Thesis, Bangor University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303377.

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48

Mo, Weiyang, Mariya Bhopalwala, Houman Rastegarfar, and Daniel C. Kilper. "Proactive and Nondisruptive Channel Probing for Wavelength Switching in Optical Transmission." IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2017. http://hdl.handle.net/10150/626438.

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Proactive and nondisruptive channel probing is investigated for the measurement of channel power, amplifier channel gain, and optical signal-to-noise ratio (OSNR) without disrupting established wavelength-division multiplexed channels. Using a nondisruptive probe signal over a three-span link, wavelength switching-induced power excursions are predicted to be within +/- 0.2 dB, and OSNR as high as 20 dB is accurately measured with a maximum of 0.5 dB error.
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49

Sperber, Tom. "Control of light in a disordered medium with gain : wavefront-shaping the pump in fiber amplifiers and fiber lasers." Thesis, Sorbonne université, 2019. http://www.theses.fr/2019SORUS366.

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L'émergence récente des techniques de façonnage spatial a démontré la possibilité de contrôler la propagation de la lumière à travers des milieux désordonnés, telles que des fibres multimodes. Le cas particulier d'une fibre multimode à gain présente une complexité supplémentaire, car la pompe, elle-même multimode, peut agir sur le signal dans des profils d'amplification spatialement complexes. Le gain hétérogène résultant est donc équivalent à un processus de diffusion non unitaire. Ces systèmes peuvent trouver leur applications plusieurs domaines, notamment les communications optiques, les la
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50

Yahel, Eldad. "Spectrally-resolved approach to rare-earth-doped fibre lasers and amplifiers." Thesis, University of Surrey, 2007. http://epubs.surrey.ac.uk/843263/.

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This work presents a new theoretical framework that extends the standard theory of quasi continuous-wave (CW) rare-earth-doped fibres to the ultrashort pulsed regime. We derive a time dependent, spectrally-resolved, nonlinear propagation equation for the coupled spectral components of the amplified pulse, within the rate-equation approximation. Our approach combines in a unified manner the effects of gain saturation, gain dispersion, fibre dispersion, fibre nonlinearity, stimulated Raman scattering, spontaneous Raman emission (with its temperature dependence) and amplified spontaneous emission
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