Готові списки джерел за темами / Silica fibers laser

Добірка наукової літератури з теми "Silica fibers laser"

Автор: Grafiati

Опубліковано: 6 вересня 2023

Оновлено: 7 вересня 2023

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Статті в журналах з теми "Silica fibers laser"

Cozic, Solenn, Simon Boivinet, Christophe Pierre, Johan Boulet, Samuel Poulain, and Marcel Poulain. "Splicing fluoride glass and silica optical fibers." EPJ Web of Conferences 215 (2019): 04003. http://dx.doi.org/10.1051/epjconf/201921504003.

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Splicing fluoride glass fibers and silica fibers is a critical point for manufacturing all fibered laser modules. As these materials are extremely different, various problems must be considered: thermal, expansion, mechanical, chemical. Reliability and power handling make priority concerns. We report splices made on a 200/220 multimode silica fiber and a double clad 15/250/290 ZBLAN fiber. Splices are proof tested at 300 g tensile strength. No damage is observed after thermal cycling from -30 °C to 85 °C, at 40 % RH during 24 hours. Typical optical splice loss is about 0.2 dB. They withstand 220 W input power at 976 nm without any damage and drastic temperature increasing.

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Khotiaintsev, S., and A. N. Castro-Martinez. "Thermal treatment of silica optical fibers with CO2-laser radiation." Electronics and Communications 16, no. 4 (March 31, 2011): 172–76. http://dx.doi.org/10.20535/2312-1807.2011.16.4.246655.

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We investigate theoretically and experimentally the effect of high-power CO2–laser radiation on silica optical fibers. We show that it takes several tens of milliseconds to heat the standard single–mode silica optical fiber to the fusing temperature of silica with the focused radiation of the CO2 laser of an output power of about 5 W. A point by point exposure of the optical fiber to the focused radiation of the CO2 laser under simultaneous axial tension results in a periodic necking of the optical fiber. Such an alteration of fiber parameters constitutes the Long Period Fiber Grating

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Храмов, И. О., та О. А. Рябушкин. "Исследование разогрева кварцевых волоконных световодов с металлической спиралью проходящим по сердцевине лазерным излучением". Письма в журнал технической физики 49, № 14 (2023): 31. http://dx.doi.org/10.21883/pjtf.2023.14.55823.19601.

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The thermo-optical properties of passive silica optical fibers with a metal spiral applied on their lateral polymer surface are investigated. It is shown that the heating of these optical fibers by transmitted laser radiation due to microbending losses causes a change in their temperature and electrical resistance of the metal spiral. Based on this, a simple method for measuring and real-time monitoring the output power of fiber lasers is proposed.

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Lim, Ki-Dong, Hun-Kook Choi, Ik-Bu Sohn, Byeong-Ha Lee, and Jin-Tae Kim. "Fabrication of Lensed Optical Fibers for Biosensing Probes Using CO2 and Femtosecond Lasers." Applied Sciences 11, no. 9 (April 21, 2021): 3738. http://dx.doi.org/10.3390/app11093738.

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We propose a new method for precisely fabricating a lensed fiber with a desired focal length by first cleaving a coreless silica fiber using an ultrafast femtosecond laser without thermal effects and subsequently shaping the radius of curvature at the optical-fiber end using a CO2 laser. The precisely cleaved segment of the coreless silica fiber obtained with the femtosecond laser is attached to a long single-mode fiber. The beam-exposure time and laser power of the CO2 laser are adjusted to melt the coreless-fiber end to yield a uniform, consistent, and precise radius of curvature, thereby realizing a lensed optical fiber. The precision of the radius of curvature in this case is greater than those obtained with the conventional arc discharge method with thermal treatment requiring fairly complex processes and yielding relatively low fabrication accuracy. In our study, we observe a difference between the measured and calculated focal lengths of the fabricated lens, possibly because the exact value of the mode field diameter is uncertain. On the other hand, the beam size measured using the knife-edge method matches closely with the theoretical size. Our findings confirm the feasibility of fabricating lensed optical fibers for fiber-based biosensing using CO2 and femtosecond lasers.

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Lu, Jiafeng, Ye Dai, Qin Li, Yali Zhang, Chunhua Wang, Fufei Pang, Tingyun Wang, and Xianglong Zeng. "Fiber nanogratings induced by femtosecond pulse laser direct writing for in-line polarizer." Nanoscale 11, no. 3 (2019): 908–14. http://dx.doi.org/10.1039/c8nr06078a.

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Wójcik, Grzegorz Michał. "Optimization of silica glass capillary and rods drawing process." Photonics Letters of Poland 11, no. 1 (April 3, 2019): 19. http://dx.doi.org/10.4302/plp.v11i1.891.

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Diameter fluctuations of silica glass rods and capillaries, during drawing process have been studied. We investigated an influence of drawing conditions on the quality of capillaries and rods. We fabricated two preforms made from different quality material. Fabricated preforms were used to draw microstructured fibers. Full Text: PDF ReferencesS. Habib et al., "Broadband dispersion compensation of conventional single mode fibers using microstructure optical fibers", Int. J. Lig. Opt. 124, 3851-3855 (2013) CrossRef A. Ziolowicz et al. "Overcoming the capacity crunch: ITU-T G.657.B3 compatible 7-core and 19-core hole-assisted fibers", Proc SPIE 10130, 101300C (2017) CrossRef T.M. Monro et al. "Sensing with microstructured optical fibres", Meas. Sci. Technol. 12, 854-858 (2001) CrossRef G. Statkiewicz-Barabach et al.,"Hydrostatic Pressure and Temperature Measurements Using an In-Line Mach-Zehnder Interferometer Based on a Two-Mode Highly Birefringent Microstructured Fiber", Sensors 2017, 17, 1648 (2017) CrossRef T. Yoon, M. Bajcsy, "Laser-cooled cesium atoms confined with a magic-wavelength dipole trap inside a hollow-core photonic-bandgap fiber", Phys. Rev. A 99, 023415 (2019) CrossRef A.N. Ghosh et al., "Supercontinuum generation in heavy-metal oxide glass based suspended-core photonic crystal fibers", J. Opt. Soc. Am. B 35, 2311-2316 (2018) CrossRef G. Wójcik et al. "Microbending losses in optical fibers with different cross-sections", Proc. SPIE 10830, 108300H (2018) CrossRef F. Xu, Selected topics on optical fiber technology and applications (IntechOpen 2018) CrossRef

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Goates, Andrew J., Raymond W. Kung, Chad R. Tracy, and Henry T. Hoffman. "Intraductal Laser Fiber Tip Fracture and Retrieval During Sialendoscopic Laser-Assisted Lithotripsy." Annals of Otology, Rhinology & Laryngology 126, no. 11 (September 12, 2017): 774–77. http://dx.doi.org/10.1177/0003489417728736.

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Fragmentation of flexible laser fiber tips has been reported to occur during therapeutic bronchoscopy and urologic stone treatment. We report fragmentation of 200-µm single-use silica-based fibers during sialendoscopy-controlled Holmium:YAG laser treatment of a parotid and a submandibular stone. The technique employed to successfully retrieve the fiber tips is described in the context of identifying this potential complication from endoscopic management of sialolithiasis.

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Koptev, Maksim Yu, Olga N. Egorova, Oleg I. Medvedkov, Sergey L. Semjonov, Boris I. Galagan, Sergey E. Sverchkov, Boris I. Denker, Alexander E. Zapryalov, and Arkady V. Kim. "Narrow-Linewidth Single-Frequency Ytterbium Laser Based on a New Composite Yb3+-Doped Fiber." Photonics 9, no. 10 (October 12, 2022): 760. http://dx.doi.org/10.3390/photonics9100760.

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Fiber single-frequency lasers are currently being actively developed, primarily due to the growing number of applications that require compact and reliable narrow-band sources. However, the most developed single-frequency fiber lasers based on phosphate fibers have the disadvantages of low mechanical strength of both the phosphate fibers themselves and their splices. In this paper we demonstrate a single-frequency laser based on a new composite Yb3+-doped active fiber. The core of this fiber is made of phosphate glass with a high concentration of ytterbium ions and its cladding is made of standard silica glass. This structure ensures a higher splicing strength of the fiber compared to the phosphate fibers and provides high resistance to atmospheric moisture. Despite the multimode structure of this fiber, we achieved stable single-frequency lasing with an average power of 10 mW and a spectral contrast of more than 60 dB in the scheme with a short (1.1 cm) cavity formed by two fiber Bragg gratings. We believe that further optimization of this fiber will make it possible to create powerful and reliable single-frequency lasers in the one-micron wavelength range.

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Romano, Valerio, Soenke Pilz, and Dereje Etissa. "Sol-gel-based doped granulated silica for the rapid production of optical fibers." International Journal of Modern Physics B 28, no. 12 (April 7, 2014): 1442010. http://dx.doi.org/10.1142/s0217979214420107.

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In the recent past we have studied the granulated silica method as a versatile and cost effective way of fiber preform production. We have used the sol-gel technology combined with a laser-assisted remelting step to produce high homogeneity rare earth or transition metal-activated microsized particles for the fiber core. For the fiber cladding pure or index-raised granulated silica has been employed. Silica glass tubes, appropriately filled with these granular materials, are then drawn to fibers, eventually after an optional quality enhancing vitrification step. The process offers a high degree of compositional flexibility with respect to dopants; it further facilitates to achieve high concentrations even in cases when several dopants are used and allows for the implementation of fiber microstructures. By this "rapid preform production" technique, that is also ideally suited for the preparation of microstructured optical fibers, several fibers have been produced and three of them will be presented here.

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Bourdine, Anton V., Alexey Yu Barashkin, Vladimir A. Burdin, Michael V. Dashkov, Vladimir V. Demidov, Konstantin V. Dukelskii, Alexander S. Evtushenko, et al. "Twisted Silica Microstructured Optical Fiber with Equiangular Spiral Six-Ray Geometry." Fibers 9, no. 5 (May 2, 2021): 27. http://dx.doi.org/10.3390/fib9050027.

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This work presents fabricated silica microstructured optical fiber with special equiangular spiral six-ray geometry, an outer diameter of 125 µm (that corresponds to conventional commercially available telecommunication optical fibers of ratified ITU-T recommendations), and induced chirality with twisting of 200 revolutions per minute (or e.g., under a drawing speed of 3 m per minute, 66 revolutions per 1 m). We discuss the fabrication of twisted microstructured optical fibers. Some results of tests, performed with pilot samples of designed and manufactured stellar chiral silica microstructured optical fiber, including basic transmission parameters, as well as measurements of near-field laser beam profile and spectral and pulse responses, are represented.

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Більше джерел

Дисертації з теми "Silica fibers laser"

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.

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The main topic of this thesis work is photosensitivity and photo-structuring of optical fibers and bulk glass. Although research in the field of photosensitivity in glass and optical fibers has been ongoing for more than three decades, the underlying mechanisms are still not well understood. The objective was to gain a better understanding of the photo-response by studying photosensitivity from a thermodynamic perspective, as opposed to established research focusing on point defects and structural changes, and strain and stress in optical fibers. Optical fibers was mainly used for experimental studies for two reasons; first, photosensitivity in fibers is more pronounced and more elusive compared to its bulk counterpart, and secondly, fibers provide a simplified structure to study as they experimentally can be seen as one-dimensional.Initially, ablation experiments on bulk glass were performed using picosecond infrared pulses. With a design cross section of 40x40 μm, straight channels were fabricated on the top (facing incident light) and bottom side of the sample and the resulting geometries were analyzed. The results show a higher sensitivity to experimental parameters for bottom side ablation which was ascribed to material incubation effects. Moreover, on the top side, the resulting geometry has a V-shape, independent of experimental parameters, related to the numerical aperture of the focusing lens, which was ascribed to shadowing effects.After this work, the focus shifted towards optical fibers, UV-induced fiber Bragg gratings (FBGs) and thermal processing with conventional oven and with a CO2 laser as a source of radiant heat.First, a system for CO2 laser heating of optical fibers was constructed. For measuring the temperature of the processed fibers, a special type of FBG with high temperature stability, referred to as "Chemical Composition Grating" (CCG) was used. A thorough characterization and temperature calibration was performed and the results show the temperature dynamics with a temporal resolution of less than one millisecond. The temperature profile of the fiber and the laser beam intensity profile could be measured with a spatial resolution limited by the grating length and diameter of the fiber. Temperatures as high as ~ 1750 °C could be measured with corresponding heating and cooling rates of 10.500 K/s and 6.500 K/s.Subsequently, a thorough investigation of annealing and thermal regeneration of FBGs in standard telecommunication fibers was performed. The results show that thermal grating regeneration involves several mechanisms. For strong regeneration, an optimum annealing temperature near 900 C was found. Two different activation energies could be extracted from an Arrhenius of index modulation and Braggv iwavelength, having a crossing point also around 900 °C, indication a balance of two opposing mechanisms.Finally, the thermal dynamics and spectral evolution during formation of long period fiber gratings (LPGs) were investigated. The gratings were fabricated using the CO2 laser system by periodically grooving the fibers by thermal ablation. Transmission losses were reduced by carefully selecting the proper processing conditions. These parameters were identified by mapping groove depth and transmission loss to laser intensity and exposure time.
Huvudtemana 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

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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.

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Анотація:

Les fibres optiques en silice dopées ytterbium sont couramment utilisées pour des applications laser à forte puissance depuis plusieurs années. Ces puissances ne cessent de croître en raison de progrès continus sur les procédés de fabrication des fibres optiques. Cette thèse s’intéresse à l’élaboration de cœurs de fibres optiques en silice vitreuse dopée ytterbium par un procédé plasma (SPCVD). Cette technique a été inventée en 1986 pour la fabrication de fibres optiques de télécommunications et nous l’avons adaptée dans ces travaux de thèse à la fabrication de cœurs de fibres à grande aire effective dopés en terres rares. Dans un premier temps, la mise au point du procédé et des différentes sources d’évaporation des précurseurs est présentée. Les principaux cœurs de fibres élaborés sont très riches en silice, et faiblement dopés en aluminium, en fluor et en ytterbium. L’homogénéité radiale et longitudinale des cœurs est discutée, et plusieurs options sont proposées pour l’améliorer. Dans un deuxième temps, la structure du réseau vitreux des cœurs élaborés ainsi que l’environnement et la dispersion de l’ion Yb3+ au sein du réseau vitreux silicaté sont étudiés. Pour cela, une approche multi-spectroscopique est utilisée : la résonance magnétique nucléaire informe sur l’environnement des noyaux à spin nucléaire non nul 29Si, 27Al et 19F tandis que la résonance paramagnétique électronique à impulsions permet à la fois de sonder spécifiquement l’environnement de l’ion Yb3+ et d’étudier sa dispersion au sein du réseau vitreux. Ces expériences sont complétées par des caractérisations optiques telles que l’absorption et la luminescence des ions Yb3+. Enfin, les cœurs de fibres élaborés par la méthode SPCVD sont caractérisés en cavité laser. L’efficacité de conversion, la qualité de faisceau et la résistance au photonoircissement de plusieurs cœurs aluminosilicatés co-dopés en fluor et en ytterbium sont présentés
Ytterbium-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

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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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Alcock, Ian Peter. "Laser action in neodymium doped silica fibre." Thesis, University of Southampton, 1988. https://eprints.soton.ac.uk/404730/.

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This thesis describes an investigation into the suitability of neodymium doped monomode optical fibre as a gain medium for miniature laser systems. Characterisation of the material and parameters required for quantitative analysis of such laser systems are presented in a spectroscopic analysis carried out in the first part of the thesis. Measurements performed in this section also indicate that at room temperature the wide fluorescence bands of the neodymium doped silica fibre are spectrally broadened by a homogeneous process. The behaviour of a longitudinally pumped continuous-wave fibre laser is modelled in the next section followed by the design and realisation of a practical system. Efficiencies of approximately 6% and threshold pump powers of 8-12 mW have been obtained, even under narrow linewidth operation. Tunability over ranges of 45-60nm has also been demonstrated. The thesis is concluded by experiments on pulsed fibre lasers. Q-switching the laser has achieved peak powers of several watts in pulses 180ns wide with good agreement between the results obtained and predicted values. Shorter pulses 450ps wide have been realised by mode-locking a fibre laser. Suggestions for reducing the pulse width further and the effects of material dispersion are also given. Finally modulated pump sources have been investigated and it is shown that synchronous pumping with short pulses has limitations due to dispersion, while resonantly pumping relaxation oscillations is a simple means of obtaining a pulsed output.

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Kalita, 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/.

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A detailed study of fabrication and characterisation of bismuth (Bi) doped silica optical fibre has been investigated. Three different fibre fabrication techniques were applied to study the possible influence on Bi-luminescence: modified chemical vapour deposition (MCVD) and the solution doping technique, MCVD chemicalin- crucible deposition technique and the powder-in-tube (PIT) technique. Spectroscopic absorption and Bi luminescence and fluorescence decay properties under different pumping wavelengths and with different host glass compositions are presented and provide important information for device applications. The influence of unsaturable loss on laser performance is investigated. The feasibility of direct laser diode pumping of Bi-doped fibre lasers at the wavelengths of 915 and 975 nm was examined by measuring excited state absorption in Bi-doped silicate fibres for the wavelength range of 900 -1300 nm. Enhancement in spectroscopic properties of Bi-doped fibre, by H2-loading, has been examined. Bi-doped fibre laser operating in the wavelength region of 1160-1179 nm has been demonstrated. The fibre laser performance at 1179 nm was investigated incorporating different cooling arrangements. The operation of Bi-doped fibre amplifier at 1179 nm, in both low and high input signal regime, was also examined. An all-fibre, narrow-linewidth, high power Yb-doped silica fibre laser at 1179 nm has been demonstrated. Furthermore, theoretical work confirms that the proposed laser architecture can be easily scaled to higher power

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Baz, 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.

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Ces travaux concernent la modélisation et la réalisation de fibres optiques micro-structurées, et plus particulièrement de fibres à bandes interdites photoniques actives et passives, à grande aire effective et destinées au transport ou à la génération de faisceaux lasers puissants.Une première partie du travail a porté sur l’étude d’une nouvelle géométrie de fibre micro-structurée - baptisée « fibre de Bragg pixélisée » - étudiée pour l’obtention d’un large cœur, monomode en pratique. Pour cette géométrie la fibre est rendue monomode en ajustant de façon optimale les distances entre les anneaux de haut indice de réfraction (condition dite demi-onde). Une première réalisation a permis de démontrer un diamètre de mode de 26μm à la longueur d'onde 1400nm dans une fibre passive. Un second aspect de ce travail a consisté en des études théoriques et expérimentales menées sur des fibres à bandes interdites photoniques présentant une gaine hétéro-structurée. Dans ces structures, la gaine comporte des résonateurs conçus pour éliminer les modes d’ordre supérieur par filtrage par les pertes. Des diamètres de mode allant de 19μm à 65μm ont ainsi été obtenus en régime monomode à 1050nm dans plusieurs fibres passives utilisées dans des bandes interdites photoniques différentes. Une fibre hétéro-structurée active a également été réalisée: le cœur, en silice pure dopée avec des ions ytterbium, a été obtenu via le procédé Sol-Gel. La fibre issue de cette réalisation a permis l’observation d’un effet laser avec une efficacité de 62.5%, pour un mode présentant un diamètre de 36μm
These 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

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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.

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Perry, 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/.

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Li, 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.

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Processing of Si in the semiconductor and solar cell industry has been dominated by the Diode Pumped Solid State (DPSS) Ultraviolet (UV) laser. Recent advances in laser source technology have produced fibre lasers with Master Oscillator Power Amplifier (MOPA) architectures that offer high repetition rates, high operational efficiencies, and pulse modulation controls exceeding those of typical Q-switched DPSS lasers. The aim of this research is to investigate 1 μm fibre laser machining of Si with a view to identifying the influential laser parameters for optimum processing of high quality, high efficiency micro drilling and surface texturing applications. A secondary aim is to develop a greater understanding of the laser material interactions and material removal mechanism when using fast rise-time nanosecond laser pulse envelopes. The IR fibre laser was able to perform percussion drilling and single pulse machining on the polished Si over a range of intensities up to 1.22 GW/cm2. With the optimum parameters, the micro-sized holes generated by the IR laser have a well defined edge, no heavy recast and no cracks. With a pulse shape of fast rise time (<7.5 ns for a 10-90% rise in signal), a high front peak power zone (approaching 14 kW) and an energetic long tail (40-180 ns), the absorption coefficient of Si at IR wavelength increased dramatically with time and temperature due to the fact that the liquid Si has a metal like absorption behavior. As a result, Si was quickly melted and the rest of pulse energy was able to remove the liquid Si effectively. The machining process left a limited amount of resolidified melt droplets and vapor condensates, which could be washed off ultrasonically. The drilling process was energy efficient when melt expulsion dominated the machining mechanism (0.08-0.2 mJ pulse energy depending on the pulse durations). The low energy pulse (~0.2 mJ) can achieve similar depth as the high energy pulse (~0.7 mJ), so high repetition rates of 100 kHz can be used to instead of 25 kHz, resulted in high processing speed. In addition, by comparing the single pulse machining with the state of the art UV laser, the IR fibre laser machined deeper features and better surface finish in the pulse energy region of >0.07 mJ. With the pulse shaping capability, the material properties can be varied and the wavelength factor can be minimized. The results suggest that applications like microvia drilling can now be carried out with the more flexible and low cost IR fibre laser. The increased repetition rates of fibre laser can increase production speed to satisfy the needs of drilling ~10 thousands holes per second, required by the modern semiconductor and solar cell production. The shortened optical penetration length of 1 μm wavelength laser on Si with increasing temperature and sufficient thermal diffusion length resulted from the asymmetrical fibre laser pulse and the dynamic properties of Si produced a thick liquid layer. A one-dimensional heat conduction model based on the surface heating source predicted that this superheated liquid layer was able to stay above 4706 K (0.905 times the thermal critical temperature 5200 K of Si) for longer than 70 ns to induce explosive boiling. This proposed material removal mechanism was also confirmed by the shadowgraph images, showing particulates ejection lasting up to ten microseconds after the laser pulse. The estimated hole depth based on the explosive boiling alone were different from the measured ones at varying peak power densities (<1.22 GW/cm2) but fixed pulse duration (200 ns), since Si was removed by a mixture of mechanisms. With varying pulse durations (40-200 ns) but fixed peak power density (~0.63 GW/cm2), the estimated depth based on the explosive boiling was in close agreement with the measured ones (6% difference on average). The SEM images at this power density showed a micron- /submicron-sized debris field, which was also observed with the explosive boiling in the past. Although the improved quality of Si machining was demonstrated with the 1 μm MOPA based fibre laser, the setup of this system was only applicable to surface texturing, blind holes and through holes of less than 100 μm in depth. Further research is required to demonstrate the capability of more energetic pulse with higher peak power and large pulse duration range to explore more machining options.

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Pommarede, 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.

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Afin de poursuivre leur montée en débit, les composants des télécommunications par fibre optique nécessitent l'élaboration de nombreuses briques de base : laser, modulateur, photo-détecteur, multiplexeur... et leur intégration avec les circuits de traitement du signal. Cette thèse a pour objectifs de concevoir et de caractériser ces différentes briques actives et passives en utilisant la technologie hybride III-V/Si. Ces briques sont ensuite utilisées dans des circuits photoniques intégrés (PIC) complets d'émission et de réception, qui présentent des avantages tels qu'une. taille réduite, une consommation et un coût de fabrication faibles. . Après une partie d'introduction, plusieurs éléments passifs sont étudiés en détail dans la 2ème partie : guides d 'ondes, virages, diviseurs de puissance, croisements de guides et hybride 90°. Tous ces dispositifs présentent de bonnes performances compatibles avec leur utilisation dans les PICs.La 3ème partie traite le problème du (dé)-multiplexage en longueur d'onde. Trois dispositifs sont étudiés : le démultiplexeur basé sur des résonateurs en anneau, des réseaux échelle et des AWG (arrayed waveguide grating). Pour les réseaux échelles, des performances à l'état de l'art ont été démontrées, d'une part sur un composant de 16 canaux séparés de 100GHz et d'autre part sur un composant de 4 canaux séparés de 20nm avec un profil aplati. Une méthode de simulation d'AWG a ensuite été présentée avec des résultats expérimentaux et théoriques à l'appui. La dernière partie traite des composants dits "actifs" et de l'intégration de toutes les fonctions précédentes dans des circuits photoniques intégrés. Les composants actifs étudiés sont les lasers, les Amplificateurs optiques en semi-conducteurs (SOA), les modulateurs à électro-absorption (EAM) et enfin les jonctions PN sur silicium comme modulateur de phase. Les PICs présentés sont d'abord deux générations de laser accordable intégré avec un EAM avec une transmission à 10Gbit/s sur 50km. Puis sont étudiés des modulateurs I/Q avec source laser accordable intégrée, d'une part avec des jonctions PN en silicium et d'autre part avec des EAM comme modulateurs pour des débits cibles de 25Gbaud/s.Une conclusion générale est tirée à la fin de la thèse. Des perspectives à court et moyen termes sont également tracées
In 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

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Частини книг з теми "Silica fibers laser"

Efremov, V. P., V. E. Fortov, A. A. Frolov, E. M. Dianov, and I. A. Bufetov. "Laser Driven Burning and Detonation Waves in Silica-Based Optical Fibers." In 28th International Symposium on Shock Waves, 783–88. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-25685-1_119.

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Meyer, Johan, Justice Sompo, and Sune von Solms. "Continuous-Wave Silica Fiber Lasers." In Fiber Lasers, 127–232. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003256380-5.

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Sleiman, Khodor, Katharina Rettschlag, Peter Jäschke, Stefan Kaierle, and Ludger Overmeyer. "Experimental Investigation of Additive Manufacturing of Fused Silica Fibers for the Production of Structural Components in the Laser Glass Deposition Process." In Innovative Product Development by Additive Manufacturing 2021, 273–85. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-05918-6_18.

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Gheewala, Shailesh M. "Fabrication of Macro Porous Silicon Structures Using Pulsed Fiber Laser Technique for Capacitive Sensor Application." In Communications in Computer and Information Science, 68–79. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-7219-7_7.

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Alaruri, Sami D. "A Step-Index Multimode Fiber-Optic Microbend Displacement Sensor Wavelength Dependent Loss." In Strategic Applications of Measurement Technologies and Instrumentation, 47–60. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-5406-6.ch003.

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In this chapter, the wavelength dependence of bend loss in a step-index multimode optical fiber (100 µm core diameter; fused silica) was investigated for fiber bend radii ranging between 2.0 and 4.5 mm using six laser excitation wavelengths, namely, 337.1, 470, 590, 632.8, 750, and 810 nm. The results obtained from fitting the bend loss measurements to Kao's model and utilizing MATLAB® indicate that bend loss is wavelength dependent and transmission loss in multimode optical fibers increases with the decrease in the fiber bend radius. Furthermore, the response of a microbend fiber-optic displacement sensor was characterized at 337.1, 470, 632.8, 750, and 810 nm. Measurements obtained from the microbend sensor indicate that the sensor output power is linear with the applied displacement and the sensor output is wavelength dependent. Lastly, references for industrial and biomedical applications of microbend fiber-optic sensors are provided. Finally, a brief description for the transmission loss mechanisms in optical fibers is given.

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Telbiz, G., O. Shvets, S. Boron, V. Vozny, M. Brodyn, and G. D. Stucky. "22-P-20-Laser dye doped mesoporous silica fibers: host-guest interaction and fluorescence properties." In Studies in Surface Science and Catalysis, 363. Elsevier, 2001. http://dx.doi.org/10.1016/s0167-2991(01)81854-1.

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Wen, Jianxiang, Ying Wan, Yanhua Dong, Yi Huang, Yanhua Luo, Gang-Ding Peng, Fufei Pang, and Tingyun Wang. "Radiation Effect on Optical Properties of Bi-Related Materials Co-Doped Silica Optical Fibers." In Bismuth - Fundamentals and Optoelectronic Applications. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.93495.

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Three kinds of Bi-related materials co-doped silica optical fibers (BRDFs), including Bi/Al, Bi/Pb, and Bi/Er co-doped fibers, were fabricated using atomic layer deposition (ALD) and modified chemical vapor deposition (MCVD). Then, the effect of irradiation on the optical properties of BRDFs was investigated. The experimental results showed that the fluorescence intensity, the fluorescence lifetime of BRDFs at the 1150 nm band, increased significantly with low-dose treatment, whereas it decreased with a further increase in the radiation dose. In addition, the merit Mα values of the BRDFs, a ratio of useful pump absorption to total pump absorption, decreased with an increase of the radiation doses. The Verdet constants of different doped fibers increased up to saturation level with increases in the radiation dose. However, for a Bi-doped fiber, its Verdet constant decreased and the direction of Faraday’s rotation changed under low-dose radiation treatment. In addition, the Verdet constant increase of the Bi-doped silica fiber was much faster than that of other single mode fiber (SMF) and Pb-doped silica fibers treated with high-dose radiation. All of these findings are of great significance for the study of the optical properties of BRDFs.

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Koch, Brian R., Sudharsanan Srinivasan, and John E. Bowers. "Hybrid Silicon Lasers." In Optical Fiber Telecommunications, 461–500. Elsevier, 2013. http://dx.doi.org/10.1016/b978-0-12-396958-3.00013-5.

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Digonnet, Michel. "Continuous-Wave Silica Fiber Lasers." In Optical Science and Engineering. CRC Press, 2001. http://dx.doi.org/10.1201/9780203904657.ch3.

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Huang, Mengyuan, Kelly Magruder, Yann Malinge, Parastou Fakhimi, Hao-Hsiang Liao, David Kohen, Gregory Lovell, et al. "Germanium on Silicon Avalanche Photodiode for High-Speed fiber Communication." In Photodetectors - Recent Advances, New Perspectives and Applications [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.107971.

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Silicon photonics is one of the promising technologies for high-speed optical fiber communications. Among various silicon photonic devices, germanium on silicon avalanche photodiode (Ge/Si APDs) received tremendous attentions because of its superior performance and integration compatibility. In 2016, normal incidence Ge/Si APD demonstrated a NRZ 10−12 sensitivity of −23.5 dBm at 25 Gb/s; more recently, a waveguide-integrated Ge/Si APD receiver presents a 106Gb/s PAM4 sensitivity of −18.9 dBm. These results are best reported performance among all APD-based devices, and these breakthroughs are mainly benefited from Ge/Si APD’s structure and material characteristics. Ge/Si APD adopts a separated charge-absorption-multiplication (SCAM) structure with a pure Ge absorber and an intrinsic Si avalanche layer. Since, Si is one of well-known best avalanche materials with large gain-bandwidth products and low ionization noise ratio, which make Ge/Si APDs demonstrating superior performance at high data rates. Moreover, this Si-based device is manufactured by standard CMOS foundries and is process-compatible with other silicon photonic devices including silicon-based waveguides, demux, hybrid, etc. This advantage simplifies the assembly of photonic systems and makes a large-scale integrated silicon photonic chip possible, which provides compact solutions for high-density communication systems. In this chapter, we review recent progresses on Ge/Si APD structure design, material, and performance.

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Тези доповідей конференцій з теми "Silica fibers laser"

Snitzer, Elias. "Rare-earth-doped fibers." In Integrated Photonics Research. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/ipr.1991.ma1.

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With the availability of compact high brightness laser diodes as pumps and low loss glasses as the hosts for rare earths, a significant new category of lasers has emerged. The small diameters for single mode fibers gives high thermal gradients that readily dissipate any heating so as to allow CW operating for outputs as high as several watts. The greatest attenuation has been given to erbium in silica operating at 1.53-1.55 μm as an optical amplifier for communications. It gives gains approaching 40 dB, gain coefficients greater titan 5 dB/mW for pumping at 0.98 or 1.47 nm, and saturation outputs of 18 dBm in fibers that are readily compatible with commercial fibers. In a double clad silica fiber, Nd at 1.06 μm can give an efficiency greater than 50% when pumped with a high output multiple stripe laser diode. In silica, laser emission has also been obtained from Pr, Sm, Ho, Tm and Yb. The lower energy phonon spectra of heavy metal fluorides has allowed for significant population in energy levels that are quenched in silicates, thereby giving additional laser transitions. Particularly striking in this regard are Ho and Tm which lase at shorter wave lengths than the pump by up-conversion through stepwise absorption of successive pump photons. Tm can lase at 455 and 480 nm when pumped with 640-690 nm radiation. Energy transfer between ions has been used for fluorescence sensitization, terminal state depletion and up-conversion. The configurations for laser oscillators, amplifiers, and super-luminescent sources will be discussed.

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Camacho Rosales, Angeles L., Martin A. Núñez Velázquez, Xiao Zhao, and Jayanta K. Sahu. "Optical fibers fabricated from 3D printed silica preforms." In Laser 3D Manufacturing VII, edited by Henry Helvajian, Bo Gu, and Hongqiang Chen. SPIE, 2020. http://dx.doi.org/10.1117/12.2543210.

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Lee, J. W., G. H. Sigel, and Jie Li. "Photosensitivity of oxygen deficient type bulk silica and fibers." In Bragg Gratings, Photosensitivity, and Poling in Glass Fibers and Waveguides. Washington, D.C.: Optica Publishing Group, 1997. http://dx.doi.org/10.1364/bgppf.1997.jma.5.

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With the development of fiber gratings, the investigations of optical phenomena induced by UV-laser irradiation such as the photosensitivity of silica-based glasses and optical fibers have been areas of active research. The severe conditions implicit in the fiber fabrication process including high melting temperatures, shear stress, neck down and rapid quenching were found to generate structural defects that are different from those present in bulk rods. Subsequent exposure of the fibers to UV-laser radiation therefore results in the modified photosensitivity of the drawn fibers. In this study, the effects of UV excimer laser (KrF) irradiation on the optical properties of silica fibers are compared to bulk rods from which they have been drawn.

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Jiang, Huawei, Lei Zhang, Xuezong Yang та Yan Feng. "Efficient silica-based fiber laser source at > 2.1 μm". У Specialty Optical Fibers. Washington, D.C.: OSA, 2016. http://dx.doi.org/10.1364/sof.2016.sotu2g.2.

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McCann, Brian P. "Comparison of silica-core optical fibers." In Optics, Electro-Optics, and Laser Applications in Science and Engineering, edited by Abraham Katzir. SPIE, 1991. http://dx.doi.org/10.1117/12.43872.

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Skutnik, Bolesh J. "Hard-plastic-clad silica optical fibers: the first decade." In OE/LASE'93: Optics, Electro-Optics, & Laser Applications in Science& Engineering, edited by Abraham Katzir. SPIE, 1993. http://dx.doi.org/10.1117/12.146333.

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Woolsey, Gerry A., and D. W. Lamb. "Absorption of polarized 10.6-um CO2 laser radiation by fused silica optical fibers." In Fibers '92, edited by Eric Udd and Ramon P. DePaula. SPIE, 1993. http://dx.doi.org/10.1117/12.141251.

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Jetschke, Sylvia, Volker Reichel, Klaus Moerl, Sonja Unger, Ulrich Roepke, and Hans-Rainer Mueller. "Nd:Yb-codoped silica fibers for high power fiber lasers: fluorescence and laser properties." In Lasers and Applications in Science and Engineering, edited by L. N. Durvasula, Andrew J. W. Brown, and Johan Nilsson. SPIE, 2005. http://dx.doi.org/10.1117/12.593408.

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Karlitschek, Peter, and Georg Hillrichs. "Characteristics of optical fibers for UV-laser sensor applications." In The European Conference on Lasers and Electro-Optics. Washington, D.C.: Optica Publishing Group, 1994. http://dx.doi.org/10.1364/cleo_europe.1994.cmi4.

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Fiber optical sensor applications for the determination of pollutants are often based on molecular fluorescence. Excitation is achieved by UV radiation that has to be transmitted through an optical fiber. Unfortunately, interaction of intense UV radiation with the commonly used fused silica fibers induces additional absorption by formation of colour centers, which is highly undesirable in sensing applications.

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Ferraro, Mario, Fabio Mangini, Yifan Sun, Mario Zitelli, Rocco Crescenzi, Alioune Niang, Maria Caterina Crocco, et al. "Laser-induced damages in silica multimode optical fibers." In Fiber Lasers and Glass Photonics: Materials through Applications III, edited by Stefano Taccheo, Maurizio Ferrari, and Angela B. Seddon. SPIE, 2022. http://dx.doi.org/10.1117/12.2623746.

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Звіти організацій з теми "Silica fibers laser"

Monro, Tanya. Silica and Germanate Glass High Power Fiber Laser Sources. Fort Belvoir, VA: Defense Technical Information Center, January 2014. http://dx.doi.org/10.21236/ada595231.

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Daly, C. H., Mark E. Tuttle, and William Kuykendall. Design and Analysis for the Carbon Fiber Composite Support Structure for Layer 0 of the D0 Silicon Micro Tracker. Office of Scientific and Technical Information (OSTI), January 2009. http://dx.doi.org/10.2172/971000.

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