Дисертації з теми "Silica fibers laser"
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Holmberg, Patrik. "Laser processing of Silica based glass." Doctoral thesis, KTH, Laserfysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-173929.
Повний текст джерелаHuvudtemana i denna avhandling är fotokänslighet och fotostrukturering av optiska fibrer och bulk glas. Trots att forskning inom fotokänslighet i glas och optiska fibrer har pågått under mer än tre decennier är de bakomliggande mekanismerna ännu inte klarlagda. Syftet var att få en bättre förståelse för fotoresponsen genom att studera fotokäsligheten ur ett termodynamiskt perspektiv, i motsats till etablerad forskning med fokus på punktdefekter och strukturförändringar, samt mekaniska spännings effekter i optiska fibrer. Optiska fibrer användes för flertalet av de experimentella studierna av två skäl; för det första är fotokänsligheten i fibrer större och dessutom vet man mindre om bakomliggande mekanismer jämfört med motsvarande bulk glas, och för det andra kan fibrer vara enklare att studera eftersom de experimentellt kan ses som en endimensionell struktur.Inledningsvis utfördes ablaherings experiment på bulk glas med en infraröd laser med pikosekund pulser. Raka kanaler med ett designtvärsnitt på 40x40 μm tillverkades på ovansidan (mot infallande ljus) och bottensidan av provet och de resulterande geometrierna analyserades. Resultaten visar en högre känslighet för variationer i experimentella parametrar vid ablahering på undersidan vilket kan förklaras av inkubations effekter i materialet. Dessutom är den resulterande geometrin på ovansidan V-formad, oavsett experimentella parametrar, vilket kunde relateras till den numeriska aperturen hos den fokuserande linsen, vilket förklaras av skuggningseffekter.Efter detta arbete flyttades fokus mot optiska fibrer, UV inducerade fiber Bragg gitter (FBG), och termisk bearbetning med konventionell ugn samt även med en CO2-laser som källa för strålningsvärme.Först konstruerades ett system för CO2-laservärmning av fibrer. För mätning av temperaturen hos bearbetade fibrer användes en speciell sorts FBG med hög temperaturstabilitet, kallade ”Chemical Composition Gratings” (CCG). En grundlig karaktärisering och temperaturkalibrering utfördes och temperaturdynamiken mättes med en tidsupplösning på under en millisekund. Temperaturprofilen i fibern, och laserns strålprofil, kunde mätas med en spatiell upplösning begränsad av gitterlängden och fiberns diameter. Temperaturer upp till ~1750 °C, vilket är högre än mjukpunktstemperaturen, kunde mätas med korresponderande uppvärmnings- och avsvalningshastighet på 10.500 K/s och 6.500 K/s.Därefter gjordes en omfattande undersökning av värmebearbetning och termisk regenerering av FBG:er i telekomfiber. Resultaten visar att termisk gitter-regenerering aktiveras av flera olika mekanismer. Värmebearbetning vid en temperatur omkring 900 °C resulterade i starka gitter efter en regenerering vid en temperatur på 1100 °C. Två olika aktiveringsenergier kunde extraheras från en Arrhenius plot avseende brytningsindexmodulation och Braggvåglängd, med en skärningspunkt tillika runt 900 °C, vilket indikerar en avvägning mellan två motverkande mekanismer vid denna temperatur.Slutligen undersöktes temperaturdynamiken och de spektrala egenskaperna under tillverkning av långperiodiga fibergitter (LPG). Gittren tillverkades med CO2-vi iilasersystemet genom att skapa en periodisk urgröpning medelst termisk ablahering. Transmissionsförluster kunde reduceras med noggrant valda processparametrar. Dessa parametrar identifierades genom mätningar av ablaherat djup och transmissionsförlust som funktion av laserintensitet och exponeringstid.
QC 20150924
Barnini, Alexandre. "Mise au point et caractérisation de nouvelles compositions de verres de silice dopée ytterbium par méthode plasma (SPCVD) pour application en tant que fibre laser." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066392/document.
Повний текст джерелаYtterbium-doped silica optical fibers are widely used for high power laser applications for several years. These powers keep on increasing due to continuous improvements in optical fibers fabrication processes. The aim of this PhD is to synthesize ytterbium-doped silica optical fibers’ cores using a plasma process named SPCVD. This method has been created in 1986 for telecommunications optical fibers synthesis, and we have adapted it to fit the fabrication of rare earth-doped large-mode-area optical fiber cores. We first present the development of ways of evaporating low vapor pressure reagents. All the synthesized optical fiber cores are silica-rich, and slightly doped with both aluminum, fluorine and ytterbium. Radial and longitudinal homogeneities are discussed, and we propose several options in order to improve them. Then, the glassy network structure of the fabricated cores and also the neighborhood and dispersal of Yb3+ ion in the silicate network are studied. Thus, we used several spectroscopic studies: nuclear magnetic resonance enables to focus on non-zero nuclear spin nucleus (29Si, 27Al, 19F) whereas electronic paramagnetic resonance is used to probe the neighborhood and the dispersal of Yb3+ ions. We also based our study on optical characterizations as absorption and luminescence of Yb3+ ions. Finally, the fibers’ cores we synthesized using the SPCVD process have been characterized in a laser cavity. We present the power conversion efficiency, the beam quality and the resistance to photodarkening of several ytterbium and fluorine-co-doped aluminosilicate cores
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.
Повний текст джерелаAlcock, Ian Peter. "Laser action in neodymium doped silica fibre." Thesis, University of Southampton, 1988. https://eprints.soton.ac.uk/404730/.
Повний текст джерелаKalita, Mridu P. "Development of bismuth doped silica fibres for high power sources & long wavelength generation from ytterbium doped fibre lasers." Thesis, University of Southampton, 2010. https://eprints.soton.ac.uk/185965/.
Повний текст джерелаBaz, Assaad. "Modélisation et réalisation de fibres à bandes interdites photoniques pour la génération et le transport des faisceaux laser puissants." Thesis, Lille 1, 2013. http://www.theses.fr/2013LIL10100/document.
Повний текст джерелаThese works concern the design and realization of micro-structured optical fibers, in particular, large mode area, active and passive, photonic bandgap fibers for high power laser beams generation and delivery. The first part of the work focused on the study of a new geometry of micro-structured fiber - so called "pixilated Bragg fiber" - in order to obtain a large, practically singlemode, core. For that geometry, the fiber is made singlemoded by optimizing the distances between the high index rings (Half wave stack condition). A first realization allowed to report a mode field diameter of 26μm measured at 1400nm wavelength in a passive fiber. The second aspect of this work included theoretical and experimental studies, of photonic bandgap fibers having a hetero-structured cladding. Specially designed resonators are added to the cladding of these fibers in order to eliminate higher order modes. Thus, 19μm to 65μm mode field diameters have been obtained in a singlemode regime at 1050nm wavelength for several passive fibers used in different bandgaps. An active fiber with hetero-structured cladding was also presented: the core was made of pure silica, ytterbium doped, synthesized using the Sol-Gel technique. The realized fiber allowed the observation of a laser emission with an efficiency of 62.5% and a mode field diameter of 36μm
Sinha, Supriyo. "Power scaling long-wavelength Yb³⁺-doped silica fiber lasers for frequency doubling to yellow /." May be available electronically:, 2007. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.
Повний текст джерелаPerry, Ian Richard. "Investigations into ytterbium, ytterbium-erbium and thulium-doped silica-based fibre lasers." Thesis, University of Southampton, 1991. https://eprints.soton.ac.uk/427927/.
Повний текст джерелаLi, Kun. "Laser micro-processing of silicon using nanosecond pulse shaped fibre laser at 1 μm wavelength". Thesis, University of Cambridge, 2012. https://www.repository.cam.ac.uk/handle/1810/245313.
Повний текст джерелаPommarede, Xavier. "Circuits photoniques intégrés III-V/Si pour les applications en télécommunications optiques." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLC020/document.
Повний текст джерелаIn order to follow the new needs in terms of optical bandwidth, optical fiber communications require the elaboration of numerous building blocks: laser, modulator, photo-detector...and their integration with signal processing circuits. This thesis has for objective the conception and caracterisation of various active and passive building blocks using the hybrid III-V/Si technology. These building blocks are then used in photonic integrated circuits (PIC) with all the necessary emission and reception functions. This enables a reduced footprint, a lower power consumption and fabrication cost.After an introduction section, several passive elements are studied in detail in the second part: waveguides, bends, power splitters, waveguide crossings and hybrid 90°. All these designs present good performances compatible with their integration in PICsThe third part treats the problem of wavelength (de)-multiplexing. Three types of device were studied: a demultiplexer based on ring resonators, echelle gratings and arrayed waveguide gratings (AWG). For the echelle gratings, state-of-the-art performances were demonstrated, first on a sample with 16 channels separated 100GHz and on the other hand a sample with 4 channels separated 20nm with a flettened profile. A simulation method for the AWG was presented with experimental and theoretical results to support the method.The last part is about "active" devices and the integration of all the previous designs in PICs. The studied active components are the lasers, semi-conductor optical amplifiers (SOA), electro-absorption modulators (EAM) and finally silicon PN junctions used as phase modulators. Two generations of a tunable laser integrated with an EAM were studied with a transmission at 10Gbit/s over 50km. The next section studied I/Q modulators with an integrated tunable laser source, using either PN silicon junction modulators or EAM with a target speed of 25Gbaud/s.A general conclusion is drawn at the end of the thesis. Short term and mid-term perspectives were also drawn
Kordás, K. (Krisztián). "Laser-assisted chemical liquid-phase deposition of metals for micro- and optoelectronics." Doctoral thesis, University of Oulu, 2002. http://urn.fi/urn:isbn:9514266862.
Повний текст джерелаLeconte, Bruno. "Contribution à l'étude de la photosensibilité des fibres en silice sous l'effet d'une insolation par un laser à ArF." Lille 1, 1998. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/1998/50376-1998-397.pdf.
Повний текст джерелаPotter, Jason. "The average holographic interferometry with single mode optical fibres and the photorefractive crystal - bismuth silicon oxide." Thesis, Brunel University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316927.
Повний текст джерелаGoutaland, François. "Processus multiphotoniques, défauts ponctuels et mécanismes de leur formation dans les fibres optiques : étude par spectroscopie laser." Saint-Etienne, 1998. http://www.theses.fr/1998STET4021.
Повний текст джерелаBernier, Martin. "Inscription de réseaux de bragg à fibre optique à l'aide d'impulsions brèves et applications aux lasers à fibre." Thesis, Université Laval, 2010. http://www.theses.ulaval.ca/2010/27475/27475.pdf.
Повний текст джерелаWang, Yuan. "Friction surface development and its structure on carbon fibre reinforced silicon carbide disc." Thesis, Loughborough University, 2011. https://dspace.lboro.ac.uk/2134/10003.
Повний текст джерелаBrasse, Gurvan. "Fibres optiques nanostructurées par voie sol-gel dans le système silice-zircone dopé terre rare : élaboration, caractérisation microstructurale et étude des propriétés de luminescence." Limoges, 2009. http://aurore.unilim.fr/theses/nxfile/default/0062135b-4c89-459a-b1f7-8746d2cce606/blobholder:0/2009LIMO4018.pdf.
Повний текст джерелаThe nanomaterials and the optical fibers are respectively in the center of the scientific and technological revolution of the last years. This thesis suggest to associate these two fields of applications, in order to elaborate new kinds of optical fibers, which present a solid core nanostructured by the sol-gel process in the silica-zirconia system doped with rare earth ions. Based on a rheological study of silica-zirconia sols, as well as thermogravimetric, thermodifferential and microstructural analysis of silica-zirconia xerogels, an elaboration method of such a fiber is defined. The so elaborated fibers are then characterized on a microstructural point of view (XRD, SEM), as well as on an optical point of view (transmission, index profile, chromatic dispersion, losses). The luminescence properties of the erbium and/or ytterbium doped fibers and undoped fibers are studied and the corresponding mechanisms are discussed. Whole of this work leads to the realization of optical fibers which present a solid nanocomposite core, with good waveguiding properties and weak losses, by taking into account the aimed applications. Original luminescence properties are finally highlighted
Razafimahatratra, Dominique. "Etude de la stabilité de la variation d'indice de réfraction photoinduite par insolation laser dans les guides d'ondes optiques germanosilicates." Lille 1, 2000. https://pepite-depot.univ-lille.fr/RESTREINT/Th_Num/2000/50376-2000-145.pdf.
Повний текст джерелаLes reseaux inscrits dans les fibres hydrogenees montrent une stabilite thermique inferieure a ceux inscrits dans les fibres non chargees en hydrogene. L'utilisation du bore comme codopant degrade fortement la tenue thermique des reseaux de bragg. Les reseaux de type iia presentent une stabilite thermique largement superieure aux reseaux de type i. Dans la deuxieme partie de ce travail, nous nous sommes propose d'etudier la photosensibilite et la stabilite des reseaux de bragg realises dans les films germanosilicates elabores par voie sol-gel. L'hydrogenation de ces guides a ete necessaire afin d'ameliorer leur photosensibilite. Des etudes de la surface insolee a l'aide de microscope a forces atomiques et du profilometre ont ete effectuees pour mieux comprendre les mecanismes a l'origine de la photosensibilite de ces guides. L'etude de la stabilite thermique des reseaux a ete realisee en utilisant la methode isochrone. Nous avons pu en deduire une estimation de l'amplitude de la variation d'indice photoinduite de l'ordre de 10 3 et les valeurs obtenues sont en accord avec les resultats obtenus dans les verres germanosilicates
Lancry, Matthieu. "Contribution à l'étude de méthodes de sensibilisation de fibres optiques de communication et mécanismes associés." Lille 1, 2004. https://ori-nuxeo.univ-lille1.fr/nuxeo/site/esupversions/ede850ab-f1c9-467d-9f5c-9ca2b64ac672.
Повний текст джерелаChahadih, Abdallah. "Photo-croissance organisée de nano-objets métalliques ou semiconducteurs dans les matériaux diélectriques destinés à la photonique." Thesis, Lille 1, 2012. http://www.theses.fr/2012LIL10060/document.
Повний текст джерелаThe thesis project aims to master the localization and organization of metallic and semiconducting nano-objects formed inside sol-gel silica materials for novel applications. The nanostructuration method used in this thesis is based on the laser irradiation and, if necessary, heat-treatment. The local character of the matter-light interaction leads to the formation of nano-objects only in the irradiated areas. Hence, it is possible to control the spatial distribution of the nano-crystallites as well as their size distribution by varying the irradiation parameters. In this thesis, porous silica monoliths produced via the sol-gel process were doped and densified. Different kinds of semiconductors (CdS, PbS) and metallic (Au, Ag) nanoparticles incorporated inside the porous SiO2 matrix have been precipitated with the assistance of laser irradiation at room temperature or by an annealing process. The local generation of nanoparticles could be performed directly on the surface of the silica xerogel using a visible continuous laser or inside the volume of the matrix by a femtosecond laser irradiation. Moreover, it has been shown that the nanoparticle size could be adjusted by choosing the concentration of the precursors in the post-doping solution, the laser wavelength, the irradiation power and/or the annealing temperature in the case of thermal precipitation. Furthermore, different methods were used to precipitate metallic nanoparticles (Ag or Cu) inside dense silica matrix. Those techniques are based on laser irradiations and/or heat treatments. Under pulsed laser irradiation, the space selective growth of noble metal nanoparticles was achieved in two steps: first, metallic nucleation centres were generated by the pulsed laser (nanosecond or femtosecond) in the irradiated areas; next, the metallic nanoparticles growth was obtained by annealing at 600°C. Besides, the doping of glassy matrices with copper nanoparticles allows foreseeing their use in the core of microstructured optical fibres. First capillary drawings have shown that the copper nanoparticles can be preserved after undergoing a melting at 2000°C
Piqueras, Ruipérez Miguel Ángel. "Photonic Vector Processing Techniques for Radiofrequency Signals." Doctoral thesis, Universitat Politècnica de València, 2016. http://hdl.handle.net/10251/63264.
Повний текст джерела[ES] El procesamiento de señales de radiofrecuencia (RF) utilizando medios fotónicos es una disciplina que apareció casi al mismo tiempo que el láser y la fibra óptica. La fotónica ofrece la capacidad de manipular señales de radiofrecuencia de banda ancha, una baja atenuación, procesados basados en una amplia variedad de fenómenos lineales y no lineales y, recientemente, el potencial para implementar subsistemas fotónicos integrados. Estas características ofrecen un gran potencial para la implementación de múltiples funcionalidades incluyendo transporte óptico, conversión de frecuencia, filtrado óptico de RF, multiplexación y demultiplexación de señales, encaminamiento y conmutación, muestreo óptico, generación de tonos, líneas de retardo, conformación de haz en agrupaciones de antenas o generación fotónica de modulaciones digitales, e incluso una combinación de varias de estas funcionalidades. Esta tesis se centra en la aplicación del procesamiento vectorial en el dominio óptico de señales de radiofrecuencia en dos campos de aplicación: la conformación óptica de haces y la modulación y demodulación vectorial fotónica de señales digitales en cuadratura. El control fotónico vectorial permite manipular la amplitud y fase de las señales de radiofrecuencia en el dominio óptico, que es el procesamiento fundamental que se requiere en diferentes aplicaciones tales como las redes de conformación de haces para agrupaciones de antenas y en la modulación en cuadratura. El trabajo descrito en esta tesis incluye diferentes técnicas para implementar una versión fotónica de las redes de conformación de haces de en agrupaciones de antenas, conocidas como redes ópticas de conformación de haces (OBFN). Se estudian dos familias de redes: arquitecturas de retardo en fibra óptica y arquitecturas integradas. Las primeras permiten el control de señales de banda ancha utilizando fibras ópticas dispersivas con técnicas de multiplexado por división de longitud de onda y funcionalidades avanzadas tales como la estimación del ángulo de llegada de la señal en la antena receptora. En la segunda, se estudian redes de conformación pasivas basadas en Matrices de Butler ópticas integradas, incluyendo una solución ultra-compacta utilizando técnicas ópticas heterodinas en silicio sobre aislante (SOI), y una alternativa homodina en sílice dopado con germanio. En esta tesis, también se han investigado técnicas de procesado vectorial fotónico para la generación de modulaciones digitales en cuadratura. Las modulaciones multinivel codifican la información digital en estados discretos de fase y amplitud de una señal eléctrica para aumentar su eficiencia espectral, como por ejemplo la modulación en cuadratura. El procesado necesario para generar y demodular este tipo de señales implica el procesamiento vectorial (control de amplitud y fase) y la conversión de frecuencia. A diferencia de la implementación electrónica o digital convencional, en esta tesis se estudian diferentes técnicas de procesado fotónico tanto para la generación de modulaciones digitales (modulación vectorial fotónica, PVM) como para su demodulación (PVdM). Esto es de particular interés en el caso de señales de banda ancha, donde la velocidad de datos requerida es del orden de gigabits por segundo, para aplicaciones como backhaul inalámbrico de redes ópticas metropolitanas (conocida como fibra hasta el aire). Las técnicas descritas se basan en explotar la dispersión cromática de la fibra óptica, la multiplexación por división de longitud de onda y la conversión en frecuencia. Además, se presenta una solución heterodina implementada monolíticamente en un circuito integrado fotónico (PIC).
[CAT] El processament de senyals de radiofreqüència (RF) utilitzant mitjans fotònics és una disciplina que va aparèixer gairebé al mateix temps que el làser i la fibra òptica. La fotònica ofereix la capacitat de manipular senyals de radiofreqüència de banda ampla, una baixa atenuació, processats basats en una àmplia varietat de fenòmens lineals i no lineals i, recentment, el potencial per implementar subsistemes fotònics integrats. Aquestes característiques ofereixen un gran potencial per a la implementació de múltiples funcionalitats incloent transport òptic, conversió de freqüència, filtrat òptic de RF, multiplexació i demultiplexació de senyals, encaminament i commutació, mostreig òptic, generació de tons, línies de retard, conformació de feix en agrupacions d'antenes i la generació fotònica de modulacions digitals, i fins i tot una combinació de diverses d'aquestes funcionalitats. Aquesta tesi es centra en l'aplicació del processament vectorial en el domini òptic de senyals de radiofreqüència en dos camps d'aplicació: la conformació òptica de feixos i la modulació i demodulació vectorial fotònica de senyals digitals en quadratura. El control fotònic vectorial permet manipular l'amplitud i la fase dels senyals de radiofreqüència en el domini òptic, que és el processament fonamental que es requereix en diferents aplicacions com ara les xarxes de conformació de feixos per agrupacions d'antenes i en modulació multinivell. El treball descrit en aquesta tesi inclou diferents tècniques per implementar una versió fotònica de les xarxes de conformació de feixos en agrupacions d'antenes, conegudes com a xarxes òptiques de conformació de feixos (OBFN), amb els objectius de proporcionar un control precís en aplicacions terrestres de senyals de banda ampla a freqüències molt altes per sobre de 40 GHz en antenes de comunicacions, optimitzant la mida i el pes quan es compara amb els homòlegs elèctrics en aplicacions espacials, i la presentació de noves funcionalitats fotòniques per agrupacions d'antenes. Per tant, s'estudien dues famílies de OBFNs: arquitectures de retard en fibra òptica i arquitectures integrades. Les primeres permeten el control de senyals de banda ampla utilitzant fibres òptiques dispersives amb tècniques de multiplexació per divisió en longitud d'ona i funcionalitats avançades com ara l'estimació de l'angle d'arribada del senyal a l'antena receptora. A la segona, s'estudien xarxes de conformació passives basades en Matrius de Butler òptiques en fotònica integrada, incloent una solució ultra-compacta utilitzant tècniques òptiques heterodinas en silici sobre aïllant (SOI), i una alternativa homodina en sílice dopat amb germani. D'altra banda, també s'ha investigat en aquesta tesi tècniques de processament vectorial fotònic per a la generació de modulacions digitals en quadratura. Les modulacions multinivell codifiquen la informació digital en estats discrets de fase i amplitud d'un senyal elèctric per augmentar la seva eficiència espectral, com ara la modulació en quadratura. El processat necessari per generar i desmodular aquest tipus de senyals implica el processament vectorial (control d'amplitud i fase) i la conversió de freqüència. A diferència de la implementació electrònica o digital convencional, en aquesta tesi s'estudien diferents tècniques de processament fotònic tant per a la generació de modulacions digitals (modulació vectorial fotònica, PVM) com per la seva demodulació (PVdM). Això és de particular interès en el cas de senyals de banda ampla, on la velocitat de dades requerida és de l'ordre de gigabits per segon, per a aplicacions com backhaul sense fils de xarxes òptiques metropolitanes (coneguda com fibra fins l'aire). Les tècniques descrites es basen en explotar la dispersió cromàtica de la fibra òptica, la multiplexació per divisió en longitud d'ona i la conversió en freqüència. A més, es prese
Piqueras Ruipérez, MÁ. (2016). Photonic Vector Processing Techniques for Radiofrequency Signals [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/63264
TESIS
Jacksén, Johan. "Improved techniques for CE and MALDI-MS including microfluidic hyphenations foranalysis of biomolecules." Doctoral thesis, KTH, Analytisk kemi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-27342.
Повний текст джерелаQC 20101214
Prakash, Roopa. "Enabling Spectral Diversity in Fiber Laser Systems: Architectures and Applications." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5378.
Повний текст джерелаMinistry of Electronics and Information technology (NNetra, Visvesvaraya PhD Scheme); Department of Science and Technology, Ministry of Science and Technology, India (NNetra)
Arun, S. "Continuous-Wave Supercontinuum Generation using Cascaded Raman Fiber Lasers." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/4888.
Повний текст джерелаCheng, Ching-Ting, and 鄭景庭. "The Study and Fabrication of Yb:YAG-Silica Fiber Laser." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/61948268486749559995.
Повний текст джерела國立高雄應用科技大學
光電與通訊研究所
96
The trivalent rare-earth-doped silica glasses based on 4f-4f transitions have recently attracted world attention as materials that can be used for high-efficiency fiber lasers. Among these materials, Yb3+-doped silica glass is an exceptionally promising fiber laser gain medium that exhibit highly efficient emission using InGaAs laser diodes as the excitations. The key advantages of the Yb3+-doped silica glass are the absence of intermediated energy levels between the two manifold levels of 2F7/2 ground state and 2F5/2 excited state, which can prevent up-conversion, excited state absorption, and self-quenching by cross relaxation, resulting in maintaining high Yb3+-doped concentration with the longer radiative lifetime. In this study, we used laser heated pedestal growth (LHPG) method to grow crystal fiber, which can grow with small diameters at very fast rate with computer control system. High quality Yb:YAG-silica fibers with a diameter ranging from 105 to 115 μm were grown. After the processes of alloy packaging, grinding, polishing, and coating, we successfully fabricated the Yb:YAG-silica fiber lasers. We discovered that the gradient concentration of Yb3+ ions distributed over the cross-section of fibers is helpful in guiding lights. The absorption, emission spectra and fluorescence lifetime of Yb:YAG-silica at room temperature have also been studied. The Yb3+ absorption band is centered at 976nm. It is also suitable to be pumped by InGaAs diode lasers. The main fluorescence band is also located around 976nm. The fluorescence lifetime of Yb:YAG-silica is about 450 s. The Yb:YAG-silica fiber with high doping concentration is a promising laser material for high power laser output . We have successfully implemented the Ti:sapphire laser (915 nm) pumped Yb:YAG-silica fiber lasers with a lasing wavelength of 1089 nm. The laser operates at a low threshold of 100 mW, and a maximum slope efficiency of 67.2%. The corresponding maximum output power is 654 mW. In the future, we will improve the cooling system, the alloy packaging, and coating to further increase the conversion efficiency and output power.
"Hybrid fiber-silicon multi-wavelength laser." 2012. http://library.cuhk.edu.hk/record=b5549121.
Повний текст джерела在論文中,我們會集中討論選取光波長的器件及整體結構的設計。在首次的結構設計上,我們利用了分佈在矽波導兩側的布拉格反射鏡作為選取光波長的器件和一小段以鉺摻雜的光纖作為放大器。我們將會詳細形容該器件的設計、模擬效果和實驗結果。我們已經透過實驗証明了單波長的光纖-矽波導混合激光器,其側模抑制超過35分貝。
另一方面,為了製作多波長的光纖-矽波導混合激光器,我們利用微環諧震器來取代分佈在矽波導兩側的布拉格反射鏡作為選取光波長的器件。我們將會討論微環諧震器的設計以及達到穩定多波長的光纖和矽波導混合激光器的設計要求。
Motivated by potential applications for optical interconnects in high performance computing, low cost optical access networks in telecommunications and integrated optical sensors, there has been much research in recent years on silicon photonics. Different silicon-based photonic devices have been studied, including optical modulators, detectors and various types of active and passive components. However, since the bandgap of silicon is indirect, the recombination of carriers injected by electrical pumping is dominated by non-radiative transitions and thus it is not possible to get optical gain via current injection into silicon diodes.
To implement integrated laser, different approaches such as erbium doping on silicon waveguide and hybrid integration of III-V semiconductors on silicon have been investigated. In this thesis, we propose and demonstrate a novel approach for making a hybrid fiber-silicon laser to simplify the design and fabrication processes. We propose the use of Erbium-doped fiber (EDF) to provide gain and silicon devices to provide all the other functionalities needed for a modulated laser.
The thesis focuses on the design of wavelength selective element and the structure of hybrid fiber-silicon laser. The first design includes a silicon waveguide side-cladding distributed Bragg reflector (WSC-DBR) as the wavelength selective component on silicon-on-insulator (SOI) wafer and a short length of EDF as the gain medium. The details of design, simulation and experimental results of the WSC-DBR will be described. Single wavelength WSC-DBR hybrid fiber-silicon laser is demonstrated with a side mode suppression ratio (SMSR) of over 35dB.
We also investigate the use of a micro-ring resonator to replace WSC-DBR for selecting multiple wavelengths. Details of the micro-ring resonator are given and we discuss the requirement and design criteria to achieve stable multi-wavelength lasing.
Detailed summary in vernacular field only.
Detailed summary in vernacular field only.
Detailed summary in vernacular field only.
Fung, Ka Yan.
Thesis (M.Phil.)--Chinese University of Hong Kong, 2012.
Includes bibliographical references.
Abstracts also in Chinese.
ABSTRACTOF THESIS ENTITLED: --- p.ii
ACKNOWLEDGEMENT --- p.v
TABLE OF CONTENT --- p.vii
Chapter 1 --- INTRODUCTION --- p.10
Chapter 1.1 --- Photonic Integrated Circuits --- p.10
Chapter 1.2 --- Silicon Photonics --- p.13
Chapter 1.3 --- Lasers in Silicon --- p.20
Chapter 1.4 --- Motivation --- p.27
Chapter 1.5 --- References --- p.29
Chapter 2 --- ERBIUM DOPED FIEBR AND FIBER LASERS --- p.34
Chapter 2.1 --- Erbium doped fiber --- p.34
Chapter 2.2 --- Multi-wavelength lasers --- p.45
Chapter 2.3 --- References --- p.54
Chapter 3 --- SINGLE CHANNEL HYBRID FIBER-SILICON LASER --- p.59
Chapter 3.1 --- Introduction of Distributed Bragg reflector --- p.60
Chapter 3.2 --- Design of waveguide side-cladding distributed Bragg reflector --- p.63
Chapter 3.3 --- Simulation results of waveguide side-cladding distributed Bragg reflector --- p.66
Chapter 3.4 --- Device fabrication --- p.69
Chapter 3.5 --- Experimental results of waveguide side-cladding distributed Bragg reflector --- p.71
Chapter 3.6 --- Experimental results of hybrid fiber-silicon laser --- p.77
Chapter 3.7 --- Introduction of micro-ring resonator --- p.81
Chapter 3.8 --- Design of race track micro-ring resonator --- p.85
Chapter 3.9 --- Experimental results of race track micro-ring resonator --- p.88
Chapter 3.10 --- Experimental results of hybrid fiber-silicon laser with ring resonator --- p.95
Chapter 3.11 --- Summary --- p.99
Chapter 3.12 --- References --- p.101
Chapter 4 --- DUAL WAVELENGTH HYBRID FIBER SILICON LASER --- p.102
Chapter 4.1 --- Design of micro-ring resonator for dual wavelength --- p.103
Chapter 4.2 --- Experimental results of micro-ring resonator --- p.104
Chapter 4.3 --- Experimental results of dual wavelength hybrid fiber-silicon laser --- p.108
Chapter 4.4 --- Summary --- p.119
Chapter 4.5 --- References --- p.121
Chapter 5 --- DUAL WAVELENGTH VERTICAL GRATING COUPLER --- p.123
Chapter 5.1 --- Introduction of grating coupler --- p.123
Chapter 5.2 --- Design of dual wavelength vertical grating coupler --- p.125
Chapter 5.3 --- Simulation of dual wavelength vertical grating coupler --- p.127
Chapter 5.4 --- Experimental results of dual wavelength vertical grating coupler --- p.135
Chapter 5.5 --- Summary --- p.138
Chapter 5.6 --- References --- p.139
Chapter 6 --- CONCLUSION AND FUTURE WORK --- p.141
Chapter 6.1 --- Conclusion --- p.141
Chapter 6.2 --- Future work --- p.144
Chapter 6.3 --- References --- p.146
Chapter APPENDIX A: --- PUBLICATION LIST --- p.147
Chapter APPENDIX B: --- LIST OF TABLES --- p.149
Chapter APPENDIX C: --- LIST OF FIGURES --- p.150
Chapter APPENDIX D: --- METHODS OF LINEWIDTH MEASUREMENT --- p.155
Chapter APPENDIX E: --- EQUIPMENT INFORMATION --- p.164
Ji, Kuan-Dong, and 紀寬東. "The Study and Fabrication of Optical Coatings on Cr4+:YAG Crystal Fiber Laser and Yb3+:YAG-silica Fiber Laser." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/ke937p.
Повний текст джерела國立中山大學
光電工程研究所
96
Recently, with the escalating demands for optical communication, the need to use broadband laser light sources in optical communication network system has increased. Henceforward, the broadband characteristes of Cr4+:YAG crystal fiber possess signifies its indispensability. Furthermore, Yb3+:YAG-silica also has its advantages in high power laser domain. In this thesis, the crystal fiber grown by the laser heated pedestal growth method is used as the laser gain medium with fused silica packaging technique. Cr4+:YAG double-clad crystal fiber with a core diameter as small as 11 μm was achieved. Moreover, a Yb3+:YAG-silica layer was formed due to the strong inter-diffusion between silica capillary and Yb3+:YAG crystal. When the silica all diffused into the Yb3+:YAG, a Yb3+:YAG-silica fiber with 125-μm core was obtained with waveguide structure. By directly coating the optical thin films onto the end faces of the two types of fibers, the laser configuration is compact and cost effective. Besides, heat dissipation is also improved. By Cu-Al alloy packaging, a record-low Cr4+:YAG double-clad crystal fiber laser was achieved with threshold of 0.75 mW and a record-high slope efficiency of 6.9% at room temperature. And we also successfully fabricate the Yb3+:YAG-silica fiber laser with low threshold (100 mW) and high efficiency (67.2%) at room temperature. In fiber laser development, we have successfully fabricated the coating of high-reflective thin films which match the faces of fiber heterostructure (single cladding and double cladding structures). It forms a cavity with anti-reflectivity for pumping wavelength and high-reflectivity for lasing wavelength. For these reasons, low threshold, high slope efficiency, and stable laser output have been achieved. Finally, through different thin-film designs, the strain effect between thin film and heterosubstrate is significantly reduced, which facilitates the realization of high performance fiber lasers.
"Nonlinear silicon waveguides for integrated fiber laser systems." 2013. http://library.cuhk.edu.hk/record=b5884460.
Повний текст джерелаThesis (Ph.D.)--Chinese University of Hong Kong, 2013.
Includes bibliographical references (leaves 134-149).
Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Abstract also in Chinese.
Tseng, Han-Wei, and 曾瀚緯. "Study of cladding-pumped Tm3+ doped silicate fiber laser." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/rw3w6g.
Повний текст джерела國立臺北科技大學
光電工程系研究所
102
In this thesis, we report on the theoretical and experimental investigation of a heavily Tm3+-doped silicate fiber. This silicate gain fiber has Tm3+ concentration of 7wt.% (8.35x1020/cm3). To the best of our knowledge, it is the highest concentration in Tm3+ doped fibers.The theoretical work is based on a commercial simulation code, LiekkiTM. Through the simulation, we verify that Tm3+ doped silicate fibers are more suitable than thulium-doped silica fibers for long-wavelength ASE emission. Furthermore, the laser and amplifier performance under the 793-nm and 1567-nm cladding pump are addressed. Finally, we experimentally demonstrate the potential of watt-level fiber amplifier and relatively long-wavelength fiber amplifier using the 50-cm 7wt.% Tm3+-doped silicate fiber. The 793nm laser diode was employed in our research to gain the advantage of “two-to-one” cross relaxation effect, enabling up to 200% quantum efficiency. The experiment work was divided into two parts. First, we have successfully developed linear and ring-cavity fiber laser at 1978.4 nm and 2013 nm with the slope efficiency of 33.8% and 15.9%, respectively. Second, a 1.48-W 1985-nm fiber amplifier as well as an 18.2 dB 2013-nm fiber amplifier were successfully demonstrated.
Ng, Sebastian Wai Seng. "Development of air-clad holmium-doped silica fibre lasers." Thesis, 2016. http://hdl.handle.net/2440/105549.
Повний текст джерелаThesis (Ph.D.) -- University of Adelaide, School of Physical Sciences, 2016.
Yang, Ling-Gang, and 楊凌岡. "Study of Fiber Lasers using Silicon Micro Ring Resonator." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/d3y85b.
Повний текст джерела國立交通大學
光電工程研究所
103
In this thesis, a narrow-linewidth and wavelength-tunable optical source at C-band (1520-1560 nm) was implemented by a ring structure of fiber laser with a mode-selective and high quality factor microcavity, so-called silicon-micro-ring-resonator (SMRR). Both of continuous-wave (CW) and mode-locking sources were demonstrated experimentally and incorporated with fiber optics technology. For CW source it operates single-longitudinal-mode (SLM) with a narrow linewidth of 4 KHz that possesses the ability to achieve a low bit-error-rate (BER). A tolerable alignment device for passive packaging ease is also considered here. Hence, SMRR was integrated with two straight waveguides and an efficient grating coupler (GC) for C-band transmission that the coupling loss between fiber and SMRR is reduced to 7 dB. Meanwhile, the GC was optimized for TE-polarization that makes tunable wavelength covers the whole C-band in a bandwidth of 35.2 nm through controlling of mode retardance inside cavity. This configuration eases the alignment tolerance (± 3 um) to 2-dimensions and shows the stably lasing modes was observed over 30 minutes. For case of mode-locking source operated by method of filter-driven four wave mixing, it exhibits a linewidth of less 1 KHz. Compared with prior arts, the proposed sources exhibit an advanced results, making the combination of microcavity and fiber optics, and it would be a new kind of wide-tunable low error optical source, offering beat signal with high spectral purity and providing additional bandwidth for wavelength-division-multiplexing in wired or wireless communication systems.
Cheng, Hao-Yun, and 鄭皓允. "Research of Silicon-Micro-Ring Resonant (SMRR)-Based Erbium-Doped Fiber Laser." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/2u8a5y.
Повний текст джерела逢甲大學
光電學系
106
In the thesis, in order to achieve a single longitudinal mode output with wavelength-tunable erbium-doped fiber ring laser, and according to the recent development of SOI, it is very interesting to construct a unique fiber laser with a sigma-based ring resonator. It is expected to be applied in optical communication, optical sensing, material processing, spectroscopy and instruments, medical diagnostics, and optical imaging. In the first section, we proposed a wavelength-tunable erbium-doped fiber (EDF) ring laser with stable single-longitudinal-mode (SLM) oscillation is proposed and investigated. Here, a silicon-micro-ring-resonator (SMRR) can be applied in a laser cavity for tuning wavelength in the C-band range. To complete the SLM oscillation, an unpumped EDF-based saturable absorber (SA) is used to act as ultra-narrowband filter for suppressing other oscillation modes. Additionally, the output stabilities of power and wavelength in the proposed EDF ring laser are also executed and discussed. In the second section, we propose and investigate a wavelength-switchable EDF glasses-type compound-ring (GTCR) laser with SLM oscillation. To accomplish wavelength-tunable operation, a SMRR is utilized inside the ring cavity, when the birefringent loss of EDF laser is adjusted properly. Moreover, the GTCR configuration is proposed serving as the mode-filter for suppressing the multi-longitudinal-mode (MLM) to achieve the SLM oscillation. Here, the measured linewidth of output wavelength is ~61 kHz. The output stabilities of the proposed SMRR EDF compound-ring laser are also discussed experimentally. In the third section, we proposed a wavelength-selectable EDF ring laser with stable SLM operation is proposed and investigated. To complete the wavelength tunability and SLM output, the SMRR and unpumped EDF-based SA are applied in the laser cavity. The output powers and optical signal to noise ratios (OSNRs) are observed in the ranges from 0.9 to 2.0 dBm and 25.8 to 32.3 dB, respectively, in the tuning range of 1530.54 to 1557.81 nm. The output wavelength linewidth of ~25 kHz can be also achieved. Moreover, the observed output power and wavelength fluctuations are less than 0.8 dB and 0.08 nm in an observation time of 30 minutes. Keywords: erbium-doped fiber ring laser; silicon-micro-ring-resonator; single-longitudinal-mode
Chen, Jhih-Yu, and 陳志宇. "Study of mode-locked Thulium-doped nanoengineering Yttrium-Alumina Silica fiber laser using semiconductor saturable absorber mirrors." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/gdbzq6.
Повний текст джерела國立臺北科技大學
光電工程系研究所
105
Because of the eye-safe properties and strong water absorption, 2 m mode-locked fiber laser sources are of big interest in applications of medicine, environmental sensing and materials processing. In this paper,we report on the investigation of mode-locked fiber lasers utilizing a Tm3+-doped nano-engineered yttrium–alumina(YA) silica glass fiber and semiconductor saturable absorber mirrors(SESAMs). The gain fiber, produced by Dr. M. C. Paul’s group in India, presents several benefits, especially the high efficiency and low loss. The pump source is a 1567-nm lab-made double-cladding-pumped Er3+ doped fiber laser. We study the mode-locked laser operation, laser slope efficiency, and output spectra under different reflectivities. Two types of cavity reflector are used. One in the fiber Bragg grating and the other is the fiber loop mirror. We successfully demonstrate the potential of the novel Tm3+-doped yttrium–alumina–silica fiber to produce a self-starting passively mode-locked fiber laser.
"Graphene-silicon waveguides as saturable absorbers in mode-locked fiber lasers." 2013. http://library.cuhk.edu.hk/record=b5549288.
Повний текст джерела單層石墨烯可以透過97.7% 垂直入射的光,吸收2.3% 左右,並且吸收的光頻非常寬。雖然對於單層碳原子結構,這個吸收率很大,但是在一些器件中,我們需要更高的光吸收率。爲了突破單層石墨烯光吸收的極限,一種可行的辦法是延長石墨烯與光相互作用的長度。將單層石墨烯轉移到長的硅波導上,可以延長石墨烯與光作用的長度。除了線性光吸收特性,石墨烯的飽和吸收特性也有廣泛的應用。很多脉衝激光發生器是利用被動鎖模的原理,即激光器中的飽和吸收器將連續的光波轉變成頻率固定的脉衝。石墨烯已經被證明是恢復速度快、調製範圍大的飽和吸收器。 但是,石墨烯和硅波導結合作為飽和吸收器的特性和它們的應用還從來沒有被研究過。
在論文中,我們研究了石墨烯轉移到硅波導后的線形光學性質和飽和吸收特性。首先我們討論了石墨烯轉移的方法,然後我們通過實驗調查了石墨烯在貴波導上的線形光學性質和飽和吸收特性。爲了研究石墨烯/硅波導在被動鎖模光纖激光器中的作用,我們利用石墨烯/硅波導作為飽和吸收器製造了一個光纖激光器。之後,通過在激光腔體中加入可调滤波器, 我們用成功的演示了波長可調製被動鎖模光纖激光器。
多脉衝激光光源在光纖通信,測量學和光學器件性能鑒定中有重要作用。所以研究緊湊、穩定並且價格實惠的多脉衝鎖模激光器非常有意義。爲了實現多脉衝鎖模光纖激光器,我們將硅基濾波器和石墨烯/硅波導集成在一起. 在論文中,我們設計并優化了能被應用於多脉衝鎖模激光器的寬帶寬濾波器凹凸光栅。
Graphene, a single 2D sheet of carbon atoms arranged in a honeycomb lattice, has superior electrical and optical properties including extremely high charge-carrier mobility, broadband optical absorption, gate-variable optical transitions and saturable absorptions. Its unique optical properties have led to a range of promising optoelectronic devices, such as photo detectors, saturable absorbers, optical modulators and nonlinear media for four-wave mixing. Graphene’s complementary metal-oxide-semiconductor (CMOS) integration processes at wafer scale and its electrochemical stability make it a promising candidate for post CMOS electronics.
Monolayer grapheme transmits 97.7% of the normal incident light and absorbs 2.3%, independent of wavelength. In order to overcome the challenge of limited absorption of a monolayer and better exploit graphene optical properties, a long interaction length is needed. By integrating graphene directly on top of silicon waveguides, longer light/graphene interactions can be achieved. In addition to the linear optical properties of the graphene, its saturable absorption also finds useful applications. Many ultra-short pulse lasers are based on passive mode-locking, where a saturable absorber turns continuous wave output of the laser into a train of optical pulses. And graphene has been shown to make an excellent saturable absorber. However, the saturable absorption behavior of graphene-silicon wavguides and their applications have never been studied.
In this thesis, the linear and saturable absorption of monolayer graphene films transferred onto silicon waveguide are investigated. The transfer process of monolayer graphene to silicon waveguides is studied and linear and saturable absorption measurements are carried out. To investigate applications of graphene-silicon waveguides, a passive mode-lock fiber lasers in which graphene-silicon waveguides act as saturable absorbers to mode-lock pulses is constructed. By adding a tunable filter in cavity, a tunable mode-locked fiber laser based on graphene-silicon waveguide is demonstrated.
Multi-wavelength pulse sources are important for applications including optical fiber communication, instrumentation, and photonic component characterization. The availability of compact, reliable and cost effective multi-wavelength mode-locked lasers is of great importance. We also hope to build multiwavelength mode-locked fiber lasers by integrating CWDM silicon filters with graphene-silicon waveguides. The design process and optimization of a silicon filter called echelle grating is demonstrated.
Detailed summary in vernacular field only.
Detailed summary in vernacular field only.
Detailed summary in vernacular field only.
Detailed summary in vernacular field only.
Shi, Zerui.
Thesis (M.Phil.)--Chinese University of Hong Kong, 2013.
Includes bibliographical references.
Abstracts also in Chinese.
Chapter Chapter 1: --- Introduction --- p.1
Chapter 1.1 --- Photonic Integrated Circuit (PIC) --- p.1
Chapter 1.2 --- Silicon on Insulator (SOI) Photonics --- p.3
Chapter 1.2.1 --- SOI Waveguides --- p.5
Chapter 1.2.2 --- SOI Waveguide Based Wavelength Division Multiplexing --- p.6
Chapter 1.3 --- Graphene Photonics --- p.9
Chapter 1.3.1 --- Band Structure of Monolayer Graphene --- p.9
Chapter 1.3.2 --- Optical Absorption of Graphene --- p.13
Chapter 1.3.3 --- Graphene Based Passive Mode-Locked Fiber Lasers --- p.18
Chapter 1.4 --- Motivation --- p.22
Chapter 1.5 --- Thesis Outline --- p.23
Chapter 1.6 --- Reference --- p.24
Chapter Chapter 2: --- Optical Properties of Graphene-Silicon Waveguides --- p.27
Chapter 2.1 --- Fabrication and Transfer Process of Graphene-Silicon Waveguides --- p.28
Chapter 2.1.1 --- Fabrication of SOI Waveguides --- p.28
Chapter 2.1.2 --- Transfer Process of Monolayer Graphene onto SOI Waveguides --- p.29
Chapter 2.2 --- Linear Optical Absorption of Graphene-Silicon Waveguides --- p.35
Chapter 2.2.1 --- Introduction to Photoexcitation in Monolayer Graphene --- p.35
Chapter 2.2.2 --- Experimental Results of Linear Absorption --- p.37
Chapter 2.3 --- In-Plane Saturable Absorption of Graphene-Silicon Waveguides --- p.38
Chapter 2.3.1 --- Experimental Result of In-Plane Saturable Absorption of Graphene-Silicon Waveguides --- p.39
Chapter 2.3.2 --- Mechanism of Saturable Absorption of Graphene-Silicon Waveguides --- p.42
Chapter 2.4 --- Summary --- p.44
Chapter 2.5 --- Reference --- p.45
Chapter Chapter 3: --- Hybrid Graphene-Silicon Waveguides Based Mode-Locked Fiber Lasers --- p.47
Chapter 3.1 --- Background of Graphene Based Mode-Locked Fiber Lasers --- p.47
Chapter 3.1.1 --- Passive Mode-Locked Lasers Fundamentals --- p.47
Chapter 3.1.2 --- Review of Recent Works of Graphene Based Mode-Locked Fiber Lasers . --- p.52
Chapter 3.2 --- Hybrid Graphene-Silicon Waveguides Based Mode-Locked Fiber Lasers --- p.55
Chapter 3.2.1 --- Experimental Set Up and Results --- p.55
Chapter 3.2.2 --- Discussion --- p.59
Chapter 3.3 --- Tunable Graphene-Silicon Waveguides Based Mode-Locked Fiber Lasers --- p.62
Chapter 3.4 --- Summary --- p.66
Chapter 3.5 --- Reference --- p.66
Chapter Chapter 4: --- Conclusion and Future Work --- p.68
Chapter 4.1 --- Conclusion --- p.68
Chapter 4.2 --- Future Work --- p.69
Chapter 4.2.1 --- Design and Simulation Results of Echelle Grating --- p.69
Chapter 4.2.2 --- Optimization and Experiment Results of Echelle Gratings --- p.77
Chapter 4.2.3 --- Integration of Echelle Grating with SOI Waveguides --- p.82
Chapter 4.3 --- Summary --- p.84
Chapter 4.4 --- Reference --- p.85
Chapter APPENDIX A: --- PUBLICATION LIST --- p.86
Chapter APPENDIX B: --- LIST OF FIGURES --- p.87
Chapter APPENDIX C: --- LIST OF TABLES --- p.91
Chapter APPENDIX D: --- atlab Code of Simulation of Echelle Grating --- p.92
Hsu, Yi-ting, and 許誼亭. "Silicate Bonding Process Applied in Glass Optical Device Coupling of Ytterbium-doped Fiber Laser System." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/26133863966322112761.
Повний текст джерела國立成功大學
光電科學與工程研究所
97
In this paper, we divided the research of fiber lasers into two parts. First, in fiber lasers, we solved the damage problem present at the output facet in high-peak power laser systems. Unlike other approaches, such as the use of a large core fiber, which would produce multimode laser output, or the use of fusion-splicing coreless end caps to increase the spot size at the silica-air interface, which would limit the allowable bend radius of the fiber, in this paper, we bonded an optical flat at the fiber exit facet to decrease intensity and to maintain good beam quality with a matched refraction index of the bond. We also showed that the output power efficiency through the bond could reach up to 96 %. The bond could increase the reliability of a high-peak power fiber laser demonstrated beyond 1 kW with a 70 nanosecond pulse width and a repetition rate of 80 kHz. Secondly, we extended the application of the bonding process to replace costly Fiber Bragg Grating (FBG) with the optical filter by a silicate bonding process. We set up a simple fiber laser system with the optical filter and showed the transmission efficiency of the filter could reach up to 88 % and operated the bond in the CW fiber laser system to produce 3.17 W laser power at 1.1 μm. The low manufacturing cost and good temperature stability made the optical filter an excellent candidate for FBG.
Krause, Michael [Verfasser]. "Efficient Raman amplifiers and lasers in optical fibers and silicon waveguides : new concepts / von Michael Krause." 2007. http://d-nb.info/994801556/34.
Повний текст джерела