Bibliografie tematiche / Lasers à fibres

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Letteratura scientifica selezionata sul tema "Lasers à fibres"

Autore: Grafiati
Pubblicato: 25 gennaio 2025

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Articoli di riviste sul tema "Lasers à fibres"

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Hennings, T., D. Hennings e C. Lindsay. "Thrombus formation using endovenous lasers: an in vitro experiment". Phlebology: The Journal of Venous Disease 29, n. 3 (6 maggio 2013): 171–78. http://dx.doi.org/10.1177/0268355512473921.

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Objectives: The purpose of these experiments was to simulate thrombus formation during endovenous laser closure by measuring coagulum formation of in vitro laser exposures in porcine blood and investigate the role of procedures and equipment in thrombus formation. Methods: Continuous wave 810, 940, 980, 1310 and 1470 nm lasers and microsecond pulsed wave 1064 nm Nd:YAG (neodymium-doped yttrium aluminium garnet), 1320 nm Nd:YAG and 2100 nm THC:YAG (thulium holmium chromium-doped yttrium aluminium garnet) lasers were tested with standard fibres with diameters of 365, 550 and 600 μm as well as two prototype modified tip fibres. Results: The results show that pulsed lasers with high-peak power densities form less coagulum. Fibre specifications were found not to influence coagulum formation, and prototype modified tip fibres designed to prevent contact between the fibre tip and the vein wall did not eliminate coagulum formation. Conclusion: Microsecond-pulsed wave lasers with high-peak power densities may be a better choice to minimize soft thrombus formation during endovenous laser ablation treatments.
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Popov, S. M., O. V. Butov, A. O. Kolosovskii, V. V. Voloshin, I. L. Vorob’ev, V. A. Isaev, D. V. Ryakhovskii et al. "Optical fibres with an inscribed fibre Bragg grating array for sensor systems and random lasers". Quantum Electronics 51, n. 12 (1 dicembre 2021): 1101–6. http://dx.doi.org/10.1070/qel17659.

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Abstract We report the latest results on inscribing extended fibre Bragg grating (FBG) arrays upon fibre drawing, obtained at the Kotelnikov Institute of Radioengineering and Electronics of RAS. The properties of these structures are considered, and examples of their application in sensor systems of microwave dense wavelength multiplexing and as a basis for designing single-frequency fibre lasers are considered. The optical and laser characteristics of FBG arrays, inscribed (using 248-nm UV laser radiation) both in standard single-mode telecommunication fibres of the SMF-28 type and in erbium-doped active fibres, are investigated.
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He, Wentao, e Zhiwei Men. "Analysis on Transmission Characteristics of Stimulated Raman Scattering Based on the Multi-Sensor Signal Enhancement Technique". Scientific Programming 2022 (11 maggio 2022): 1–9. http://dx.doi.org/10.1155/2022/5726718.

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In recent 20 years, fibre laser system has been developed rapidly and widely used for its high quality, high efficiency, high robustness, and compactness. However, there are still many factors (such as non-linear effect, thermal effect, and mode instability) that limit the further increase of power of fibre laser system. Stimulated Raman scattering (SRS) is one of the main limitations in the transmission process of fibre lasers. It not only reduces the output efficiency of fibre lasers, but also increases the damage risk of reverse Stokes light to the system. Recent studies have shown that SRS in low-mode fibres can lead to quasi-static mode degradation in addition to mode instability. With the introduction of multi-sensor enhancement technology in the fibre field, it becomes an effective means to popularise high-power and high-beam quality fibre lasers. Based on the multi-sensor signal enhancement technology, this paper explores the influence of this technology on the output efficiency of SRS in the mode-reducing fibre laser, which provides a new idea and method for the output efficiency and transmission analysis method of fibre laser.
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Provino, Laurent, Achille Monteville, David Landais, Olivier Le Goffic, Adil Haboucha, Thiery Taunay e David Mechin. "Les fibres microstructurées : 20 ans d’existence et un vaste éventail d’applications". Photoniques, n. 99 (novembre 2019): 40–44. http://dx.doi.org/10.1051/photon/20199940.

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Les fibres optiques microstructurées, également appelées fibres à trous ou fibres optiques à cristal photonique sont un type récent de guides de lumières originaux et performants apparues dans le milieu des années 1990. Elles se sont depuis imposées comme une technologie incontournable de la photonique moderne. L’originalité première de ce genre de fibre a été de permettre le guidage de la lumière dans un matériau unique grâce à leur structuration périodique. Après une vingtaine d’années de recherche, la gamme possible de structures de ces fibres optiques s’est grandement étoffée, donnant lieu à plusieurs catégories de fibres microstructurées classifiées par type de mécanisme de guidage (par réflexion totale interne, par bande interdite photonique, et par couplage inhibé). Arrivées à maturité aujourd’hui, ces fibres optiques ont démontré au fil des années un potentiel d’applications extrêmement vaste et ce, dans des domaines très variés allant de la défense aux applications biophotoniques, sous la forme de capteurs optiques ou de lasers fibrés de forte puissance.
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McCaffer, C. J., L. Pabla e C. Watson. "Curved adjustable fibre-optic diode laser in microscopic cholesteatoma surgery: description of use and review of the relevant literature". Journal of Laryngology & Otology 132, n. 4 (8 marzo 2018): 360–63. http://dx.doi.org/10.1017/s0022215118000117.

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AbstractObjective:The use of lasers in cholesteatoma surgery is common and well accepted. The most commonly used laser fibres are straight and non-adjustable; these have several limitations. This paper describes the use of an alternative laser fibre.Method:This ‘How I Do It’ paper describes and illustrates the use of an alternative curved adjustable fibre-optic diode laser in microscopic cholesteatoma surgery.Results:The curved, adjustable laser fibre allows accurate and atraumatic disease removal when the use of a straight laser fibre may be less effective or accurate. It reduces potential damage to delicate structures without the need for extra drilling or bone removal.Conclusion:It is suggested that the curved adjustable laser fibre is superior to the traditional straight fibre for cholesteatoma surgery.
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Canning, John, Nathaniel Groothoff, Kevin Cook, Cicero Martelli, Alexandre Pohl, John Holdsworth, Somnath Bandyopadhyay e Michael Stevenson. "Gratings in Structured Optical Fibres". Laser Chemistry 2008 (1 dicembre 2008): 1–19. http://dx.doi.org/10.1155/2008/239417.

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Grating writing in structured optical fibres and their properties and applications are reviewed. To date, most gratings have been written in a straightforward manner into structured fibres containing a photosensitive germanosilicate step-index core. However, gratings have also been written directly into single material, structured silica fibres and into air-clad cores using two and higher-photon processes with both UV and near IR pulsed (nanosecond-femtosecond) light. Given the intrinsic-added functionality possible within a structured optical fibre, structured fibre gratings offer further capabilities for sensors, diagnostics, lasers, and devices.
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Ivanenko, A. V., B. N. Nyushkov e S. V. Smirnov. "Generation of high-energy single pulses and pulse clusters in ytterbium fibre lasers with quasi-synchronous modulation of the pump power". Quantum Electronics 51, n. 12 (1 dicembre 2021): 1061–67. http://dx.doi.org/10.1070/qel17653.

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Abstract Additional capabilities of the method of quasi-synchronous pump power modulation developed by the authors for nanosecond high-energy pulsed oscillation of fibre lasers with a long-lived (about 1 ms) upper laser level are investigated. Using an Yb fibre laser as an example, it is shown that quasi-synchronous pump power modulation makes it possible to generate not only a periodic sequence of single nanosecond pulses, but also regular pulse clusters with a controlled number of nanosecond subpulses that make up a cluster. In addition, the feasibility of scaling the energy of laser pulses obtained by the method of quasi-synchronous modulation of the pump power is studied when proceeding to the use of active double-clad fibres and higher-power multimode pump sources. Pulses with energies up to 430 nJ are obtained in a laser configuration maintaining linear polarisation of radiation. The results obtained significantly expand the possibilities of applying the method of quasi-synchronous modulation of the pump power in conventional fibre lasers based on stimulated emission.
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Dianov, Evgenii M., Igor' A. Bufetov, V. M. Mashinsky, Aleksei V. Shubin, O. I. Medvedkov, A. E. Rakitin, Mikhail A. Mel'kumov, V. F. Khopin e A. N. Gur'yanov. "Raman fibre lasers based on heavily GeO2-doped fibres". Quantum Electronics 35, n. 5 (31 maggio 2005): 435–41. http://dx.doi.org/10.1070/qe2005v035n05abeh003415.

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Gambling, W. Alex. "Optical fibres, lasers, and amplifiers". Endeavour 16, n. 1 (gennaio 1992): 17–22. http://dx.doi.org/10.1016/0160-9327(92)90112-3.

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Leconte, Baptiste, Laurent Bigot, Philippe Roy, Raphael Jamier, Romain Dauliat, Marie-Alicia Malleville, Yves Quiquempois, Hicham El Hamzaoui e Olivier Vanvincq. "Lasers de forte puissance : vers l’avènement de fibres optiques à aire effective extrême". Photoniques, n. 99 (novembre 2019): 23–27. http://dx.doi.org/10.1051/photon/20199923.

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Abstract (sommario):
Les systèmes lasers fibrés sont au coeur de nombreuses recherches académiques et constituent un marché annuel mondial dépassant le milliard d’euros. L’augmentation de la puissance en sortie de ces dispositifs a été rendue possible grâce à une innovation permanente portant sur la géométrie de fibres, les matériaux qui les constituent et les méthodes de synthèse associées. Après un bref rappel historique, nous rappelons quelques éléments de contexte et présentons quelques avancées récentes en matière de fibres à très grandes aires effectives.
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Più fonti

Tesi sul tema "Lasers à fibres"

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Guezennec, Tristan. "Sοurces paramétriques fibrées pοmpées par impulsiοns à fοrte dérive de fréquence : Ρerfοrmances et dynamique". Electronic Thesis or Diss., Normandie, 2024. http://www.theses.fr/2024NORMR074.

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Abstract (sommario):
L'utilisation de la spectroscopie Raman cohérente dans divers domaines scientifiques a motivé la conception de sources optiques multi-longueur d'onde. Dans ce contexte, le développement d'amplificateurs paramétriques fibrés à dérive de fréquence (FOPCPAs), puis d'oscillateurs paramétriques fibrés à dérive de fréquence (FOPCPOs) a permis la génération d'impulsions ultra-courtes, énergétiques et accordables. Ces travaux de thèse portent sur l'étude de FOPCPOs suivant deux axes principaux : la montée en énergie de ces sources, avec ici une production d'impulsions portant plus de 1 µJ à cadence élevée, et l'étude de la dynamique de ces sources. Une comparaison avec un FOPCPA démontre ainsi l'intérêt des FOPCPOs, générant un train d'impulsions moins bruité qu'un FOPCPA équivalent. Ces travaux ouvrent ainsi la voie à l'intégration de ces sources, permettant d'envisager l'utilisation de ces sources hors du laboratoire, mais aussi au développement de nouvelles méthodes de spectroscopie Raman de part la grande diversité de régimes qu'il est possible d'obtenir à partir de ces architectures
The use of coherent Raman spectroscopy in various scientific fields has led to the design of multi-wavelength optical sources. In this context, the development of fiber optical parametric chirped-pulse amplifiers (FOPCPAs), the fiber optical parametric chirped-pulse oscillators (FOPCPOs), has enabled the generation of ultrafast, energetic and tunable pulses. This thesis work focuses on the study of FOPCPOs along two main axes: the energy scaling of these sources, with here the production of pulses carrying more than 1 µJ at high repetition rate, and the study of the dynamics of these sources. A comparison with a FOPCPA demonstrates the benefits of FOPCPOs, which tend to generate a less noisy pulse train than an equivalent FOPCPA. This work pavs the way for the integration of these sources, enabling them to be used outside of the laboratory, and also for the development of new Raman spectroscopy methods, thnaks to the wide range of regimes that can be obtained from these architectures
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Guionie, Marie. "Lasers à fibres bifréquences bipolarisations : stabilisation et montée en fréquence du battement". Thesis, Rennes 1, 2020. http://www.theses.fr/2020REN1S059.

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Cette étude porte sur les lasers à fibres bifréquences bipolarisations. Le contrôle de la différence de fréquence de ces lasers représente un enjeu important en photonique microonde. En effet, maîtriser le battement permettrait la réalisation de sources compactes et à faible bruit visant des applications de métrologie ou télécom. Nous travaillons ici sur des sources émettant à 1,5 μm, de type DFB ou DBR, soit dopés Er soit co-dopés Er-Yb. Ils présentent une fréquence de battement d'environ 1 GHz pour les DFB, et 100 MHz pour les DBR. Les objectifs de la thèse ont été, d'abord de stabiliser le battement, puis d'explorer différentes méthodes pour modifier la biréfringence de la fibre et ainsi accroître la fréquence de battement. Nous avons d'abord utilisé la méthode de stabilisation par boucle à verrouillage de phase pour asservir le battement sur une fréquence de référence. En nous servant de la diode de pompe comme actuateur, nous avons réussi à stabiliser des battements entre 300 MHz et 10 GHz pendant plusieurs jours. Ensuite, nous avons mis en place une méthode de stabilisation par réinjection optique décalée en fréquence. Un modèle théorique basé sur des équations-bilan couplées a été utilisé et a permis de retrouver les observations expérimentales. En stabilisant le battement sur une référence extérieure, différents régimes dynamiques ont été observés. Dans la zone stable, on réduit le bruit de phase jusqu'à −100 dBc/Hz à 1 kHz de la porteuse. Puis, nous avons couplé le montage de la réinjection optique a une ligne à retard, afin de stabiliser efficacement le battement sur lui-même. Enfin, nous avons étudié plusieurs pistes pour augmenter la fréquence de battement des lasers DBR pour répondre aux besoins des applications. Nous avons pu suivre en temps réel la modification de biréfringence photo-induite par un faisceau UV. Nous avons aussi étudié une méthode de modification réversible de la biréfringence, en exploitant l'effet élasto-optique. Quelque soit la méthode employée, nous avons observé un accroissement de la fréquence de battement depuis 100 MHz jusqu'à plus de 10 GHz dans le meilleur des cas
This work is about dual-polarization dual-frequency fibers lasers. The control of the frequency difference of these lasers is a major challenge in microwave photonics. Controlling the beat frequency could allow compact and low-noise sources, in order to develop applications in metrology or telecom. Here, we focus on 1.5 μm sources, in either DFB or DBR configurations, made of Er-doped or co-doped Er:Yb silica fibres. Their beat frequency is about 1 GHz for DFB lasers, and 100 MHz for DBR lasers. This thesis investigates several methods to stabilize the beat note, then to modify the fiber birefringence, to increase the beat frequency. First, an optical phase-locked loop method is used to lock the beat note on a frequency reference. By using the pump diode as an actuator, we have successfully stabilized beat frequencies between 300 MHz and 10 GHz for days. We then study a stabilization method by frequency-shifted optical feedback. A theoretical model based on rate equations model is used and allows to retrieve the experimental observations. We observe different dynamical regimes by locking the beat note on a reference frequency. In the stable area, we reduce the phase noise to −100 dBc/Hz at 1 kHz from the carrier. Next, we have mixed the set-up of the injection-locking to a delay line, in order to effectively stabilize the beat note on itself. Finally, various approaches have been explored to increase the beat frequency of DBR lasers, to the needs of applications. It has been possible to continuously monitor the impact of a UV beam on the fiber birefringence. We also studied a method for reversible modification of the birefringence, exploiting the elasto-optical effect. Regardless of the method used, we observed an increase in the beat frequency from 100 MHz to more than 10 GHz in the best case
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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 leurs profils de guidage et de dopage est également présentée. Le comportement amplificateur des fibres optiques dopées est ensuite décrit théoriquement en insistant sur les limites fixées par l'élargissement inhomogène de la transition laser. L'évolution du gain intégré de la fibre est mise en évidence en fonction des paramètres influants (longueur, rayon de dopage. . . ) en soulignant l'intérêt d'un rayon de dopage optimisé. Le seuil d'accrochage du laser est modélisé par des équations et des abaques sans dimension déterminant la longueur de fibre optimale en fonction des pertes de la cavité laser. La conception générale du laser à fibre est ensuite synthétisée et les technologies des composants d'optique intégrée adaptés à la fibre amplificatrice le constituant sont comparées. Les techniques expérimentales concernent principalement l'étude de l'accordabilité par excitation sélective de sites et de la limitation du gain par émission stimulée sur la transition de pompage induisant une absorption résiduelle non saturable ; l'étude des effets de transferts dans les fibres dopées par luminescence coopérative : l'étude d'un procédé de changement de valence par irradiation y conduisant à une réduction des ions uranium placés en matrice verre fluoré (zblan) ; la démonstration d'un effet laser à trois niveaux, fonctionnant en régime continu et en contre-réaction externe par réseau
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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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Didierjean, Julien. "Etude thermique des cristaux lasers, Réalisation de lasers à fibres monocristallines". Phd thesis, Université Paris Sud - Paris XI, 2007. http://tel.archives-ouvertes.fr/tel-00417564.

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Les systèmes lasers solides s'imposent de plus en plus dans de nombreuses applications de la lumière laser. L'évolution rapide des diodes laser de pompe vers des systèmes de plus en plus puissants et compacts permet d'espérer une montée en puissance de ces systèmes. Néanmoins, cette montée en puissance est limitée par la résistance des milieux amplificateurs aux fortes puissances de pompe. Les cristaux massifs habituellement utilisés dans ces systèmes sont en particuliers limités par d'importants effets thermiques. De nouvelles architectures ont été développées pour tenter de résoudre cette difficulté, mais aucune ne permet aujourd'hui de combiner simplicité, forte puissance moyenne, et forte puissance crête. Les travaux que nous présentons sont répartis sur deux axes de recherche. Notre premier objectif est de mieux comprendre les effets thermiques dans les cristaux laser. Notre deuxième objectif est de mettre au point un nouveau milieu laser ayant le potentiel de dépasser les limites actuelles. Nous avons mis en place d'un banc de caractérisation thermique complet, permettant de caractériser de mesurer la conductivité thermique et le coefficient thermo-optique des matériaux laser, en condition d'utilisation, sans nécessiter de données extérieures issues de la bibliographie. Nous présentons quelques exemples d'utilisations pratiques de ce banc. En collaboration avec l'entreprise Lyonnaise Fibercryst, nous avons également développé un nouvel concept laser, le laser à fibre monocristalline, alliant les avantages de la géométrie des lasers à fibre en silice et les qualités intrinsèques des cristaux massifs. Nous présentons la caractérisation des fibres obtenues par croissance micro-pulling down, ainsi que leurs résultats laser. Nous montrons que ces milieux sont très prometteurs pour la réalisation de laser alliant forte puissance moyenne et forte puissance crête.
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Delevaque, Eric. "Contribution à l'étude de composants actifs à fibre de silice dopée aux ions de terres rares". Lille 1, 1993. http://www.theses.fr/1993LIL10040.

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Cette these traite de l'etude du comportement de composants a fibre de silice dopee aux ions de terres rares. Les fibres dopees sont particulierement attractives comme milieu amplificateur: elles permettent des gains d'amplification superieurs a 40 decibels avec des moyens de pompage compatibles avec la technologie des diodes laser semi-conducteur. Les composants etudies sont: l'amplificateur, le laser et la source superluminescente. Des experiences ont permis de montrer qu'une fraction des ions de terre rare dans les fibres se presente sous forme d'agregats de quelques ions. Ceci constitue un des points fondamentaux de cette etude. Un modele analytique est propose. Sa conception simple a permis la description du comportement des composants et une approche quantitative simplifiee de leur optimisation. Les coupleurs selectifs en frequence sont une des deux innovations technologiques experimentees. Ils ont permis le developpement de l'amplificateur a 1. 55 microns et de la source superluminescente a fibre dopee a l'erbium. Les reseaux de bragg photo-inscrits constituent la seconde innovation. Leurs possibilites ont ete testees sur un laser a fibre dopee au neodyme emettant a 1. 08 microns.
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Xu, Mengrong. "Advances in hollow core fibres and application to mid-infrared fibre gas lasers". Thesis, University of Bath, 2018. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760959.

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Abstract (sommario):
Anti-resonant hollow core fibre is a new kind of optical fibre waveguide in which light is trapped in a hollow core surrounded by the capillary formed microstructured cladding. This fibre exhibits high damage threshold, low dispersion and ultra-low nonlinearity with relatively low loss of a few tens of dB/km. Its intrinsic feature of multimode delivery limits the applications with high requirements of single mode transmission. In my thesis, I demonstrate how the design of hollow core fibre can be improved with single mode guidance. S2 imaging measurement was used to analyse the mode content of the solid core fibres. In my research, I established S2 measurement to measure the mode contents in hollow core fibres for the first time. Two hollow core fibres with 8 capillaries and 7 capillaries in their claddings were fabricated in same fashion and showed differences in low attenuations. By comparing the mode contents in both of the fibres via S2 imaging measurement, 7-capillary HCF was demonstrated to give better performance on single mode guidance. Among the applications of the HCF, the property of delivering high power in HCF makes the gas filled HCF laser possible. In my research, a continuous-wave mid-infrared acetylene filled hollow core laser was built with a slope efficiency of 33% and an output power of over 1 watt at the wavelength region of 3.1~3.2 μm. The pump source is an Erbium-doped fibre amplified tunable laser diode which works at C-band wavelength. The fibre without the gain medium has two transmission bands with low attenuation of 0.037 dB/m and 0.063 dB/m at pumping and lasing wavelengths respectively. This laser system works in either cavity-based configuration or single pass ASE configuration. The latter configuration shows a better performance in high output power and high slope efficiency. The optimized laser system was studied experimentally with the proper fibre length and gas pressure. This laser system could be extended to be filled with other molecules to longer wavelengths and has potential for high power output.
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8

Sakr, Hesham. "Towards mid-infrared fibre lasers : rare earth ion doped chalcogenide glasses and fibres". Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/33338/.

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Abstract (sommario):
This Project is aimed at developing rare earth ion doped chalcogenide glasses targeting mid-infrared (MIR) fibre lasers, emitting in the wavelength region 4 - 5 μm. The work reported in this thesis has two objectives: (i) a study of the Ge-As-In-Se glass system when doped with a single species of rare earth (RE) ions, i.e. praseodymium (Pr3+) or cerium (Ce3+), or when co-doped with two rare earth ion species: Pr3+ and Ce3+, and (ii) a study of the effect of replacing a gallium (Ga) additive with an indium (In) additive on the physical and optical properties of the undoped and Pr3+ doped Ge-As-(Ga/In)-Se glasses and fibres. The MIR, i.e. 3 - 25 μm wavelength, offers to advance many photonics areas including bio-medical imaging spectroscopy for human tissue sensing in vivo for early cancer diagnosis. Low loss RE-ion doped MIR fibre lasers are potential pumps for MIR supercontinuum generation (SCG) sources for a compact MIR broadband device. Also, MIR fibre narrowband lasers offer potential new wavelengths for laser medical surgery. To date, there are no MIR rare earth ion doped glass fibre lasers emitting at wavelengths ≥ 4 μm. Selenide (Se)-based glasses, a member of the chalcogenide glass family, are known for their wide transparency up to 12 μm and good rare earth ion solubility. In the Project, an additive to the Ge-As-Se glass system of indium or gallium is considered to help decluster the rare earth ions and increase their solubility in the as-prepared Pr3+ doped Ge-As-(Ga/In)-Se glasses. However, an indium additive is concluded here to achieve a lower rare earth ion solubility limit than that obtained using the equivalent gallium additive in the Ge-As-(Ga/In)-Se glass systems. On the other hand, the photoluminescent intensity is concluded here to be approximately doubled when using an indium additive in Pr3+ doped Ge-As-In- Se, compared to the analogous gallium glasses. Furthermore, the decay lifetime, at the same emission wavelength of 4.7 μm, is found to be longer in the Pr3+ doped Ge-As-In-Se glasses when compared to the Pr3+ doped Ge-As- Ga-Se glasses. Overall, for a singly-doped Ge-As-In-Se glass system, Pr3+ offer wide photoluminescence spectral emission in the range 3 - 6 μm, which promotes this type of glass fibre as an active source for MIR laser emission in the target range of 4 - 5 μm. However, the photoluminescent decay lifetime, at 4.7 μm, of Pr3+ doped Ge-As-In-Se is concluded to decrease substantially with the number of thermal processes invoked to fabricate the glass-based fibres; a lifetime of 7 - 9 ms measured on the as-prepared fibres is compared to the decay lifetime of 9 - 10.1 ms that were found in the bulk glasses. Alternatively, the addition of Ce3+ in the Ge-As-In-Se glass system is concluded to offer a larger absorption cross-section than that of the Pr3+ in the wavelength range 3.5 - 5 μm. Co-doping the Pr3+ / Ce3+ in Ge-As-In-Se in order to enhance the MIR photoluminescence emission in the range 3 - 6 μm is also investigated. It is concluded that rare earth ions, in particular Ce3+ and / or Pr3+, doped chalcogenide glass fibres based on the Ge-As-In-Se glass system, developed through this Project, are strong candidates towards achieving MIR fibre lasers.
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Nguty, T. A. "Light sensitive optical fibres". Thesis, University of Salford, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360457.

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Scurria, Giuseppe. "High power 2 μm fiber laser for mid-infrared supercontinuum generation in fluoride fibers". Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0342.

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Le développement de sources optiques ayant une forte brillance et un large spectre est nécessaire pour différentes applications telles que les contremesures optroniques, les systèmes LIDAR et la spectroscopie. Ce travail de thèse est consacré à l'étude de la génération de supercontinuum de forte puissance dans le domaine spectral allant de 2 à 5 μm. Un laser à fibre dopé thulium, émettant à 2 μm, a été réalisé et caractérisé en régimes continu, déclenché et à verrouillage de modes déclenchés. En régime continu, une puissance de 45 W a été atteinte avec un rendement différentiel de 58%. L'intégration de deux embouts en quartz fondu, fusionnés aux extrémités de la fibre active, a permis une amélioration drastique du contrôle de la température et de la stabilité générale du système dans tous les régimes de fonctionnement précédemment mentionnés. En régime combiné, de verrouillage de modes déclenchés, la puissance moyenne maximale en sortie de laser était de 40 W à une fréquence de déclenchement de 150 kHz. Pour une puissance moyenne en sortie de 20 W et une fréquence de déclenchement de 50 kHz, l'impulsion verrouillée la plus énergétique avait une énergie de 88 μJ et une puissance crête estimée de 60 kW. Dans tous les régimes de fonctionnement mentionnés, le facteur de propagation du faisceau M2 était proche de la limite de diffraction avec une excellente valeur de 1,1. Le faisceau de ce laser fibré a été utilisé pour pomper des fibres optiques en fluorure pour la génération de supercontinuum dans le domaine spectral de 2 à 5 μm. Les travaux expérimentaux ont été focalisés sur les matériaux en fluorure que sont le ZBLAN et le fluorure d’indium (InF3). Avec la fibre en ZBLAN, plus de 10 W ont été générés sur l'ensemble du domaine spectral avec une limite supérieure de domaine spectrale allant jusqu'à 4,4 μm. L'efficacité de conversion du supercontinuum a été mesurée à 35%, 28%, 15% et 8% pour un faisceau généré de longueur d'onde supérieure à 2,15 μm, 2,65 μm, 3,1 μm et 3,5 μm, respectivement. Concernant la fibre en InF3, la réalisation d'un nouveau système d'injection (combinant une fibre ZBLAN large coeur et un coupleur commercial fibre à fibre) a permis d'atteindre une grande stabilité thermo-mécanique de la fibre pendant les expériences à haute puissance. La génération de supercontinuum dans cette fibre s'est concrétisée par un faisceau de sortie dont le spectre atteignait la longueur d'onde de 4,7 μm et une puissance de 7 W sur l'ensemble du domaine spectral. À notre connaissance, ceci est le premier faisceau supercontinuum, ayant une puissance de l'ordre de quelques watts, généré dans une fibre en InF3 pompée par un oscillateur unique
High brightness and broad spectrum optical sources in the mid-infrared (mid-IR) are promising for different applications such as optronic countermeasures, LIDAR systems and spectroscopy. This thesis research work is dedicated to the investigation of high power supercontinuum generation in the 2-5 μm range. A thulium-doped fiber laser emitting at 2 μm has been built and characterized in continuous wave, Q-switching and Q-switched mode-locking regime. In continuous wave operation, as much as 45 W have been reached with a slope efficiency of 58%. The implementation of two fused-quartz end-caps fusion spliced at the extremities of the active-fiber improved the thermal management and the overall stability of the entire system in all mentioned regimes of operation, allowing for higher pump powers. In Q-switched mode-locking, the maximum average output power level was 40 W, for a Q-switch repetition rate of 150 kHz. At the average output power level of 20 W and 50 kHz of Q-switch repetition rate, the most energetic mode-locked pulse had an energy of 88 μJ and an estimated peak power of ~60 kW. In all the mentioned operation regimes, the measured beam parameter M2 of the fiber laser was 1.1, close to the diffraction limit. This laser has been used to pump fluoride optical fibers (ZBLAN and InF3) for supercontinuum generation in the 2-5 μm range. In ZBLAN, more than 10 W in all spectral bands have been obtained, with an output spectrum extending up to 4.4 μm. A conversion efficiency of 35%/28%/15%/8% has been measured for wavelengths longer than 2.15 μm/2.65 μm/3.1 μm/3.5 μm, respectively. For the InF3 fiber, a new design of an injection system, consisting of a large core diameter ZBLAN optical fiber and a commercial fiber-to-fiber coupler, allowed to enhance the thermo-mechanical stability of the fiber. The supercontinuum radiation generated in InF3 showed an output spectrum spanning up to around 4.7 μm with an output power level of 7 W in all spectral bands. To the best of our knowledge, this was the first Watt-level supercontinuum radiation in an InF3 fiber pumped by a singleoscillator
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Libri sul tema "Lasers à fibres"

1

Young, Matt. Optics and lasers: Including fibers and optical waveguides. 5a ed. Berlin: Springer, 2000.

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Young, Matt. Optics and lasers: Including fibers and optical waveguides. 4a ed. Berlin: Springer-Verlag, 1992.

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Young, Matt. Optics and lasers: Including fibers and optical waveguides. 3a ed. Berlin: Springer-Verlag, 1986.

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F, Digonnet Michel J., a cura di. Rare-earth-doped fiber lasers and amplifiers. 2a ed. New York: Marcel Dekker, 2001.

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Quoc, Ngo Nam, a cura di. Ultra-fast fiber lasers: Principles and applications with MATLAB models. Boca Raton: CRC Press, 2010.

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Erwin-Ulrich, Kotte, e FAST (Program), a cura di. Technologies of light: Lasers, fibres, optical information processing, early monitoring of technological change : a report from the FAST Programme of the Commission of the European Communities. Berlin: Springer-Verlag, 1988.

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Erwin-Ulrich, Kotte, e FAST (Program), a cura di. Technologies of light: Lasers, fibres, optical information processing : early monitoring of technological change : a report from the FAST Programme of the Commission of the European Communities. Berlin: Springer-Verlag, 1989.

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Derge, Klaus. Technologies of Light: Lasers · Fibres · Optical Information Processing Early Monitoring of Technological Change A Report from the FAST Programme of the Commission of the European Communities. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989.

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Masato, Kimura, a cura di. Fiber lasers: Research, technology, and applications. Hauppauge, NY, USA: Nova Science, 2009.

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Heikkinen, Veli. Tunable laser module for fibre optic communications. Espoo [Finland]: VTT Technical Research Centre of Finland, 2004.

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Capitoli di libri sul tema "Lasers à fibres"

1

Adams, M. J., e I. D. Henning. "Semiconductor Lasers". In Optical Fibres and Sources for Communications, 59–82. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4899-3710-0_6.

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Grivas, Christos, Pantelis Papadopoulos e Argiro Klini. "Excimer Laser Assisted Deposition and Characterization of Molybdenum Films — Fabrication of Molybdenum Coatings on Optical Fibres". In High Power Lasers — Science and Engineering, 549–59. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-015-8725-9_35.

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Meyer, Johan, Justice Sompo e Sune von Solms. "Optical Fibers". In Fiber Lasers, 13–66. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003256380-2.

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Ferguson, A. I., M. W. Phillips, D. C. Hanna e A. C. Tropper. "Fibre Lasers". In Laser Spectroscopy VIII, 422–25. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-540-47973-4_135.

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Hanna, David C. "Fibre Lasers". In NATO ASI Series, 231–45. Boston, MA: Springer US, 1993. http://dx.doi.org/10.1007/978-1-4615-2998-9_16.

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Eichler, Hans Joachim, Jürgen Eichler e Oliver Lux. "Optical Waveguides and Glass Fibers". In Lasers, 245–66. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99895-4_13.

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Heidt, Alexander M., Dirk-Mathys Spangenberg, Anupamaa Rampur, Alexander Hartung e Hartmut Bartelt. "All-Normal Dispersion Fiber Supercontinuum: Principles, Design, and Applications of a Unique White Light Source". In The Supercontinuum Laser Source, 299–341. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-06197-4_6.

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AbstractUltrafast and low-noise supercontinuum (SC) sources based on all-normal dispersion (ANDi) fibers are emerging as key-enabling technology for new applications in spectroscopy, microscopy, and ultrafast photonics. In this chapter we review the fundamental physics, fiber designs, and applications of this unique white light source.
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Romaniuk, Ryszard S. "Special Optical Fibres". In Laser/Optoelektronik in der Technik / Laser/Optoelectronics in Engineering, 766–69. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-48372-1_162.

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Young, Matt. "Fibers and Optical Waveguides". In Optics and Lasers, 265–92. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-662-04260-1_10.

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Ghatak, Ajoy, e K. Thyagarajan. "Optical Fibers". In Springer Handbook of Lasers and Optics, 1171–208. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-19409-2_14.

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Atti di convegni sul tema "Lasers à fibres"

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Podrazky, Ondrej, Jan Mrazek, Petr Varák, Jana Proboštová, Ivo Barton e Ivan Kašík. "Nanocrystalline ceramic coatings for the capillary fiber lasers". In Specialty Optical Fibres, a cura di Pavel Peterka, Kyriacos Kalli e Alexis Mendez, 33. SPIE, 2023. http://dx.doi.org/10.1117/12.2665632.

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Theodosiou, Antreas, Loukas Koutsokeras, Andreas Ioannou, Andrei Stancalie, Daniel C. Negut, Jan Aubrecht, Pavel Peterka, Georgios Constantinides e Kyriacos Kalli. "Post-radiation effects of core pumped monolithic holmium-doped silica fibre lasers". In Specialty Optical Fibres, a cura di Pavel Peterka, Kyriacos Kalli e Alexis Mendez, 30. SPIE, 2023. http://dx.doi.org/10.1117/12.2665051.

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Weber, HP, e W. Lüthy. "Fibre lasers for surgery". In The European Conference on Lasers and Electro-Optics. Washington, D.C.: Optica Publishing Group, 1996. http://dx.doi.org/10.1364/cleo_europe.1996.cthm1.

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According to the absorption properties of tissue, a laser for microsurgery should emit radiation of 2.9 µm wavelength. This wavelength is absorbed in tissue within 1 µm and leads to evaporation with a minimum thermal damage in the walls of the incision. If monomode emission is used, the laser light can be focused to a very small spot. The resulting thin coagulation layer, however, cannot stop bleeding from larger vessels. For haemostasis a wavelength of 2 µm with a penetration depth of several hundred µm is preferable. For application in surgery therefore both wavelength 2 µm and 3 µm have to be available. These wavelengths can be generated in fibre lasers doped with Erbium for 3µm emission [1] or Thulium and Holmium for 2 µm emission [2]. Monomode fibre lasers are optically excited with a pump beam that has to be launched into the small rare earth- doped core of the fibre with a diameter of typically less than 10 µm. In view of this small target also the pump laser has to be operated in low transverse mode order or even in fundamental mode. For such a pump laser the available power is limited to about 1 Watt. In our experiments an output power of 158 mW has been reached for ZBLAN:Er3+ fibres [1] and 30 mW for silica:Tm:Ho fibres. These values were only limited by the available pump power. The output power of CW monomode fiber lasers, can be enhanced using a double clad fibre structure [3]. Double clad fibres can be excited with powerful multimode laserdiode arrays. An output power of several Watts has already been demonstrated in a Nd3+ doped double clad fibre [4,5].
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Langridge, P. E., e W. J. Firth. "Doubly Nonlinear Fibre Loop Lasers". In Nonlinear Guided-Wave Phenomena. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/nlgwp.1991.tue6.

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Over the last decade, fibre-based devices incorporating single or multiple linear directional couplers have been the subject of theoretical and experimental investigation. These include fibre resonators [1-6] and linear [4] and nonlinear [7] loop mirrors. Except in [6] and [7], the devices involve linear propagation of a continuous wave (cw) or long pulse input. Only [7] studies operation with narrow pulses. Fibres have been incorporated in laser systems since the development of the soliton laser [8]. Recently, lasers with rare earth doped (neodymium [9] or erbium [10]) fibres as the active medium have been developed. All the above laser systems involve linear coupling to and from the fibre.
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Yoo, S., S. Raghuraman, D. Ho, M. S. Yue, X. Wu e L. Zhang. "Fibre fabrications for high power laser fibres and high nonlinearity fibres". In 2015 11th Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR). IEEE, 2015. http://dx.doi.org/10.1109/cleopr.2015.7376503.

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Tropper, A. C. "Visible Upconversion Fiber Lasers". In Compact Blue-Green Lasers. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/cbgl.1992.thb1.

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Over the past two years several upconversion-pumped visible laser systems based on lanthanide-doped fluorozirconate glass fibre have been reported[1-5], illustrating the great potential of this medium for efficient infrared to visible conversion. Confinement of pump radiation in a small core fiber lead to rapid multiple step pumping of high-lying metastable energy levels for fairly modest levels of pump power. Compared to silica fibers the low vibrational energies of the heavy metal fluoride glass matrix leads to a greatly reduced competition to optical pumping and emission processes from nonradiative decay. A further advantage relative to silica is the narrowness of the absorption and fluorescence bands giving higher peak cross-sections and less likelihood of unwanted excited state absorption(ESA). Fluoride fibre fabrication technology has now reached a point at which small core fibres (i.e. monomode in the visible) with scattering losses down to ~ 0.2dBm−1 can be made, so that the remarkable properties of the fluoride glass host can be embodied in efficient compact devices.
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Nishimura, Junji, e Katsumi Morishita. "Varied Spectral Properties of Annealed Dispersive Fibres". In The European Conference on Lasers and Electro-Optics. Washington, D.C.: Optica Publishing Group, 1996. http://dx.doi.org/10.1364/cleo_europe.1996.cthb7.

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Optical fibres made from core and cladding materials with different dispersions are proposed theoretically to get optical fibre devices that have not yet been achieved by conventional fibres [1]. The fibres are called dispersive fibres due to their large wavelength dependence of the index difference. Dispersive fibres arc fabricated from optical glasses whose refractive-index curves interseet [2]. However, it is difficult to make dispersive fibres with various chromatic characteristics because of limited number of optical glasses. In this paper, it is shown that spectral properties of dispersive fibres can be changed greatly by annealing under the proper conditions.
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Hereth, R., D. Garus e F. Schliep. "Transient behaviour of fibre optic Brillouin ring lasers". In Nonlinear Dynamics in Optical Systems. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/nldos.1992.mc26.

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Stimulated Brillouin scattering (SBS) is the dominant non-linearity in silica optical fibres. In high­finesse all-fibre ring resonators with fibre lengths of the order of 10 m stimulated Brillouin scattering can be observed at input power levels in the range of 10 to 100 μW [1]. Above pump threshold fibre optic ring resonators show intensive laser oscillation at the Stokes wavelength and therefore are called Brillouin ring lasers (BRL). An important application of Brillouin ring lasers is the all-fibre optic ring laser gyro [2].
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Sinclair, A. G., I. S. Ruddock e R. Illingworth. "Optical Assessment of Single Crystal Fibres". In Nonlinear Optics. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/nlo.1992.we9.

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Single crystal fibres are grown by the Laser Heated Miniature Pedestal Growth technique [1] in lengths of up to ~ 50mm and with diameters in the range 50-500 μm. By this method, doped fibres, for example Cr3+ and Ti3+ in sapphire (alumina) for use in solid-state lasers or fibres of various nonlinear crystals may be produced. For laser action to be possible or for a fibre to be used in an optoelectronic device, there are several requirements to be met:- (i) the fibre diameter and cross-section must be uniform, (ii) the direction of the optic axis in an anisotropic crystal should be known, (iii) the fibre ends should be flat and preferably normal to the fibre axis, (iv) the fibre surface should be smooth so as to minimise scattering losses, and (v) for a fibre to be incorporated into a laser cavity a polarised Gaussian beam entering the fibre at one end must emerge from the other as a Gaussian beam of a known state of polarisation.
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Birks, T. A., e J. C. Knight. "Excitation of Whispering Gallery Modes in Fibres by Fibres". In The European Conference on Lasers and Electro-Optics. Washington, D.C.: Optica Publishing Group, 1998. http://dx.doi.org/10.1364/cleo_europe.1998.cthi2.

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We have recently reported the use of a narrow single-mode fibre taper to excite whispering gallery modes (WGMs) in fused silica microspheres[1]. Here we demonstrate the similar excitation of WGMs in dielectric cylinders. The dielectric cylinder is itself a tapered fibre, made by stretching the fibre in a flame to give a filament of predictable diameter. The two tapers are positioned at right angles and in contact. The transmission spectrum of the "sensor" taper (measured using a tunable diode laser) has dips at wavelengths where light is coupled from its guided mode to a WGM in the "target" taper.
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Rapporti di organizzazioni sul tema "Lasers à fibres"

1

Holdren. L51934 Feasibility of Nd-Yag Laser-Arc Welding Processes for Girth Welding. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), dicembre 2002. http://dx.doi.org/10.55274/r0010632.

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Laser beam welding (LBW) has become standard in many high-production and critical applications where the return on investment can be quickly realized due to the process' inherent efficiency in terms of weld penetration and travel speed. Also, some promising work has been done internationally related to the use of hybrid laser/arc welding (HLAW) for some applications (primarily shipbuilding), so this process variation was also included in the study. However, virtually all of the current LBW or HLAW applications are considered 'factory' applications, and therefore do not represent the logistical challenge associated with bringing laser technology to on or offshore pipeline welding operations. This project was aimed at studying the feasibility of overcoming those logistical challenges in order to realize the potential cost savings of applying this high production process. This study was limited to the application of Nd:YAG lasers (which can be delivered via fiber-optic cable) since the logistics of incorporating higher power CO2 lasers was felt to be impractical. The focus of the project was to study the potential productivity of the LBW and HLAW processes in terms of the thickness of material that could be welded in a single pass at a given travel speed. Additionally, the robustness of the process was determined using weld joints with less than ideal fit up. Potential feasibility of the processes were then determined by considering both the practical aspects of their application as well as the economic justification.
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Morse, T. F. Advances in Fiber Lasers. Fort Belvoir, VA: Defense Technical Information Center, maggio 2002. http://dx.doi.org/10.21236/ada409019.

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Morse, T. F. Research in Fiber Lasers. Fort Belvoir, VA: Defense Technical Information Center, gennaio 2002. http://dx.doi.org/10.21236/ada430983.

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Ballato, John, Martin Richardson, Michael Bass e Bryce Samson. High Power Fiber Lasers. Fort Belvoir, VA: Defense Technical Information Center, agosto 2012. http://dx.doi.org/10.21236/ada570856.

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Weist, Todd E., Daniel S. Hinkel e Kevin Whitcomb. Blue Emitting Fiber Lasers. Fort Belvoir, VA: Defense Technical Information Center, febbraio 1998. http://dx.doi.org/10.21236/ada341571.

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Morse, T. F. Advances in Fiber Lasers. Fort Belvoir, VA: Defense Technical Information Center, novembre 1999. http://dx.doi.org/10.21236/ada380043.

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Brueck, Steven, Craig Robin e Thomas M. Shay. Developing Pulsed Fiber Lasers. Fort Belvoir, VA: Defense Technical Information Center, giugno 2007. http://dx.doi.org/10.21236/ada472993.

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Sutton, Jacob O. FIBER LASER CONSTRUCTION AND THEORY INCLUDING FIBER BRAGG GRATINGS Photonic Crystal Fibers (PCFs) and applications of gas filled PCFs. Office of Scientific and Technical Information (OSTI), marzo 2017. http://dx.doi.org/10.2172/1346829.

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Simpson, Thomas B. Fiber Laser Array. Fort Belvoir, VA: Defense Technical Information Center, gennaio 2002. http://dx.doi.org/10.21236/ada403729.

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Kautz, D. D., L. V. Berzins, E. P. Dragon, M. E. Werve e B. E. Warner. Drilling with fiber-transmitted, visible lasers. Office of Scientific and Technical Information (OSTI), febbraio 1994. http://dx.doi.org/10.2172/10136734.

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