Dissertationen zum Thema „Lasers à fibre – Innovation“
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Tiabi, Nadia. „Synthèse de préformes dopées ytterbium par voie poudre pour la réalisation des lasers à fibre de haute puissance“. Electronic Thesis or Diss., Limoges, 2023. http://www.theses.fr/2023LIMO0049.
The work presented in this manuscript is part of a PhD thesis carried out by CIFRE in collabora-tion between the laboratory of Xlim and the technological center of optics and lasers "ALPhA-NOV". The main objective of this thesis is to design ytterbium doped preforms that are resistant to the photodarkening (PD) phenomenon for use in high power laser applications.This phenomenon degrades laser performance and leads to reduced output. Two main areas are focused in this thesis. The first is the definition of the core composition and the appropriate synthesis method for the production of preform cores which are resistant to photodarkening (PD). The second is to develop, characterize and evaluate the optical performance of the resulting fiber. The matrix that has been chosen for the study is the alumino-phosphosilicate matrix. To obtain this matrix, a synthesis method called "powder in suspension" was used.From the synthesis of the preform to the drawing of the optical fiber, the different stages of the process have been validated. Excellent performance, with low attenuation of 0.1 dB/m and a very promising optical-to-optical conversion efficiency of 76%, was obtained from the optical tests performed on the fiber. The evaluation of the fiber against photodarkening showed an exceptional resistance. No performance degradation was observed over 100 hours
Baker, Stephen Ross. „Optical fibre lasers“. Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239585.
Pendock, Graeme John. „Optical fibre dye lasers“. Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308241.
Alvarez-Chavez, Jose Alfredo. „High-power fibre lasers“. Thesis, University of Southampton, 2003. https://eprints.soton.ac.uk/15478/.
Malleville, Marie-Alicia. „Évaluation du potentiel des fibres apériodiques à très large aire modale pour la réalisation de sources laser impulsionnelles“. Thesis, Limoges, 2020. http://www.theses.fr/2020LIMO0009.
These Ph.D work is conducted in the context of a long-term collaboration between Xlim laboratory and the company EOLITE Systems in order to develop new large mode area fibers typically capable of providing up to 200 W of average output power and a peak power of 1 MW while maintaining a transverse single-mode emission at 1030 nm. For that purpose, optical fibers with an aperiodic microstructuration (FA-LPF) were developed in order to improve the performances of commercial fibers, mainly by pushing further the transverse mode instabilities power threshold. An unprecedented experimental study has been conducted to investigate the influence of the fiber structure, the laser source architecture and the mode field diameter. Furthermore, by replacing the commercial fiber by a FA-LPF in an industrial laser prototype, as a proof-of-concept, the FA-LPF permits to obtain a laser source with at least similar properties as those of the laser sources of the company regarding the laser efficiency or the lifetime test. The feasibility of a microstructured fiber shorter and still efficient (50 cm-long), has also been studied, by increasing the ytterbium ions concentration in the FA-LPF core or by improving the core to clad ratio. Finally, a new concept of fiber with a depressed-index core led to core diameters higher than 110 μm while maintaining a transverse single-mode emission
Gloag, Andrew John. „Tunable erbium doped fibre lasers“. Thesis, University of Strathclyde, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249838.
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.
Lin, Jin Tong. „Polarisation effects in fibre lasers“. Thesis, University of Southampton, 1990. https://eprints.soton.ac.uk/404646/.
Mears, Robert Joseph. „Optical fibre lasers and amplifiers“. Thesis, University of Southampton, 1987. https://eprints.soton.ac.uk/396453/.
Hu, Tomonori. „Ultrafast Mid-infrared Fibre Lasers“. Thesis, The University of Sydney, 2015. http://hdl.handle.net/2123/13885.
Kelleher, Edmund J. R. „Advancements in mode-locked fibre lasers and fibre supercontinua“. Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/9584.
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.
Cowle, Gregory John. „Narrow-linewidth erbium-doped fibre lasers“. Thesis, University of Southampton, 1991. https://eprints.soton.ac.uk/399361/.
Gray, Stuart. „Fibre soliton lasers and their applications“. Thesis, University of Southampton, 1997. https://eprints.soton.ac.uk/394565/.
Burns, David. „Fibre-compatible modelocked lasers at 1.5μm“. Thesis, University of St Andrews, 1991. http://hdl.handle.net/10023/14158.
Leung, Ian Kin-Hay Electrical Engineering & Telecommunications Faculty of Engineering UNSW. „Development of composite cavity fibre lasers for fibre laser hydrophone systems“. Publisher:University of New South Wales. Electrical Engineering & Telecommunications, 2008. http://handle.unsw.edu.au/1959.4/41248.
Xiang, Dao. „Study of Random Fibre Lasers and Applications“. Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/32767.
Rulkov, Andrey. „All-fibre lasers for nonlinear wavelength conversion“. Thesis, Imperial College London, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.501290.
BOETTI, NADIA GIOVANNA. „Nd3+ doped phosphate glass optical fibre lasers“. Doctoral thesis, Politecnico di Torino, 2014. http://hdl.handle.net/11583/2543408.
Cranch, Geoffrey Alan. „Large-scale remotely interrogated arrays of fibre-optic interferometric sensors and fibre lasers“. Thesis, Heriot-Watt University, 2001. http://hdl.handle.net/10399/1197.
Wright, Fiona Cameron. „Highly polarised ytterbium doped photonic crystal fibre lasers“. Thesis, University of Strathclyde, 2010. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=11869.
Olivier, Michel. „Interactions de solitons dans les lasers à fibre“. Thesis, Université Laval, 2008. http://www.theses.ulaval.ca/2008/25290/25290.pdf.
Burns, David. „Fibre-compatible modelocked lasers at 1.5#mu#m“. Thesis, University of St Andrews, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317786.
Kallimani, Klio I. „Modelling of external cavity lasers using fibre gratings“. Thesis, University of Essex, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336948.
Ye, Chen Chun. „Spectroscopy of erbium-doped fibre amplifiers and lasers“. Thesis, University of Southampton, 1995. https://eprints.soton.ac.uk/399077/.
Selvas-Aguilar, Romeo de Jesus. „Cladding-pumped neodymium and ytterbium doped fibre lasers“. Thesis, University of Southampton, 2004. https://eprints.soton.ac.uk/41526/.
Debut, Alexis. „Cohérence temporelle des lasers Brillouin à fibre optique“. Lille 1, 2000. http://www.theses.fr/2000LIL10094.
Ivanenko, Aleksey. „Ultra-long mode-locked Er-droped fibre lasers“. Thesis, Aston University, 2013. http://publications.aston.ac.uk/20855/.
Alcon, Camas Mercedes. „Applications of ultralong Raman fibre lasers in photonics“. Thesis, Aston University, 2011. http://publications.aston.ac.uk/15795/.
Wong, Yuk Lun. „Short optical pulses from injection lasers“. Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293009.
Horikis, Theodore. „Soliton radiation in optical fibre“. Thesis, Imperial College London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.251957.
Richards, Billy Donald Orac. „Tellurite glass mid-infrared (1.9 - 2.1 um) fibre lasers“. Thesis, University of Leeds, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.493606.
Lapointe, Marc-André. „Lasers à fibre de puissance opérés en régime continu“. Thesis, Université Laval, 2010. http://www.theses.ulaval.ca/2010/27088/27088.pdf.
This research project focuses on high power fiber lasers operated in the continuous regime. The main objective is the implementation of a 400-W fiber laser using ytterbium- doped double clad fiber. The wide variety of high power fiber lasers assembled during this work has enabled the study of the thermal effects, the power limitations and the behavior of the output spectrum. The study includes simulations that characterize the behavior of fiber lasers operated in the continuous regime. Different laser configurations were tested at a signal power of 100 W. The heat transfer in double clad fibers was analyzed to circumvent the difficulties caused by the important amount of heat generated by these lasers. The concept of contact resistance is brought in to explain the temperature rise of active fibers. This was necessary for the realization of single-mode fiber lasers with over 350W of output power. The output power was only limited by the availability of pumps. Several compromises were necessary to achieve the high output power and the diffraction-limited beam quality. Thus, the photodarkening of the ytterbium doped fiber is still an issue for this kind of lasers. A tool to predict the spectral broadening of high power fiber lasers has been developed. It is shown that four-wave mixing broadens the outpu t spectrum of these lasers as a function of output power. The broadening of the output spectrum has been experimentally verified by the implementation of various lasers with different configurations. A theoretical model is presented, which shows a good agreement with experimental data.
O, Cochlain Ciaran R. „Tunable erbium doped fibre lasers for lightwave communication systems“. Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.283935.
Runcorn, Timothy. „Extending the wavelength coverage of frequency-doubled fibre lasers“. Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/61332.
Kbashi, Hani. „Vector optical rogue waves in mode-locked fibre lasers“. Thesis, Aston University, 2018. http://publications.aston.ac.uk/37771/.
Hideur, Ammar. „Etude et réalisation de lasers à fibre de puissance“. Rouen, 2001. http://www.theses.fr/2001ROUES043.
This work deals with the study of an ytterbium-doped double-clad fibre laser side-pumped using the v-groove technique operating in different regimes around 1. 06mm. In the first part, we present the last developments in the field of high-power diode-pumped fibre laser including the double-clad structures and the pumping techniques. In the second part we investigate experimentally the dynamics of a high power ytterbium-doped double-clad fibre laser in various optical configurations. Different self-pulsing regimes are identified resulting from third-order non-linear effects. The third part is devoted to the study and the realisation of a passively mode-locked ytterbium-doped fibre laser using the non-linear polarisation rotation technique
Lhermite, Jérôme. „Auto-synchronisation et combinaison cohérente de lasers à fibre“. Limoges, 2008. https://aurore.unilim.fr/theses/nxfile/default/71cfaacc-0380-4854-a1a0-1a1586b5ef3b/blobholder:0/2008LIMO4049.pdf.
Power scaling in single-mode fiber lasers or amplifiers is accompanied with detrimental nonlinear effects, due to the strong spatial confinement of the field inside the optical guide. A key to achieve high powers is laser beam combining. In this thesis, we have investigated two laser architectures performing coherent combining in a passive way. A first interferometric configuration uses an intracavity frequency filter ensuring the coherent summation of the fields amplified in a tree arrangement. The combined beam emerges from the common arm of the laser interferometer. The continuous, Q-switched and mode-locked regimes, were studied. The second laser architecture realizes the phase locking of the parallel amplifiers by an intracavity spatial filter. The multiple cophased emissions are then combined in far field
Papachristos, Thalis. „Generation of microwaves using a mode locked fibre ring laser for radio-over-fibre systems“. Thesis, University of Kent, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.344148.
Davies, D. A. O. „Twin stripe lasers for switching and logic“. Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333272.
Webb, Andrew. „Novel optical fibre fabrication techniques for Yb-doped high-power fibre lasers and sensing applications“. Thesis, University of Southampton, 2012. https://eprints.soton.ac.uk/349228/.
Gray, John W. D. „The use of loop mirrors and chirped fibre Bragg gratings in actively-modelocked fibre lasers“. Thesis, Aston University, 1998. http://publications.aston.ac.uk/7980/.
Inci, M. Naci. „Optical coatings for fibre optic sensors“. Thesis, Heriot-Watt University, 1992. http://hdl.handle.net/10399/1455.
Smith, Richard. „Optical fibre sensors for radioactive environments“. Thesis, University of Liverpool, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318305.
Crawford, Stephanie. „The Development of a High Power, Broadly Tunable 3 µm Fibre Laser for the Measurement of Optical Fibre Loss“. Thesis, The University of Sydney, 2015. http://hdl.handle.net/2123/13989.
Duval, Simon. „Laser femtoseconde à fibre optique émettant dans l'infrarouge moyen“. Doctoral thesis, Université Laval, 2019. http://hdl.handle.net/20.500.11794/37364.
The development of lasers emitting in the mid-infrared, a spectral region where the funda-mental resonances of several molecules are found, is one of the most promising avenues in laserscience. However, the democratization of these coherent light sources is required for enablingbreakthrough applications in healthcare, environment, industry and research. Thanks to theirsimplicity, robustness, reliability and their unequaled optical performances, fiber lasers are thecandidates of choice for enabling this technological shift toward the mid-infrared.In this project, the first femtosecond fiber laser emitting in the mid-infrared was realized. Thishigh added-value laser offers exceptionnal temporal, spectral and spatial properties that pavethe way for several applications in spectroscopy and laser-matter interaction.The design, optimization and theoretical study of this femtosecond laser cavity emitting at 2.8μm are presented in chapters 1 and 2 as well as in appendix B. The generation of ultrashortpulses in this laser relies on a mode-locking technique based on nonlinear polarization evolutionof the signal propagating inside an erbium-doped fluoride fiber. Pulses with durations below300 fs and estimated peak powers above 20 kW were directly generated from this oscillator.The second part of this thesis (chapters 3 and 4) presents the design and numerical studyof an external fiber amplifier that significantly improves the performances of the oscillator.This amplifier that uses only one segment of erbium-doped fluorozirconate fiber enables thegeneration of ultrashort pulses with peak powers above 200 kW. Due to the soliton self-frequency shift process occuring inside the amplifier, the central wavelength of the outputpulses can be tuned from 2.8 to 3.6μm. This tunable femtosecond system in the mid-infraredcan be further simplified and improved and can also be adapted to other novel laser transitionsin the mid-infrared. This work paves the way for new applications to emerge both in thescientific and the industrial worlds.
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/.
Dalloz, Nicolas. „Formation du spectre optique dans les lasers Raman à fibre“. Phd thesis, Université des Sciences et Technologie de Lille - Lille I, 2011. http://tel.archives-ouvertes.fr/tel-00628627.
Brunet, François. „Lasers à fibre de verre fluoré pompés par transitions multiples“. Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0023/MQ51119.pdf.
Forster, Richard John. „Development and applications of single frequency erbium doped fibre lasers“. Thesis, University of Strathclyde, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.248516.