Relevant bibliographies by topics / High power fiber lasers

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'High power fiber lasers'

Author: Grafiati
Published: 6 September 2023

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Journal articles on the topic "High power fiber lasers"

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Zeng, Lingfa, Xiaolin Wang, Yun Ye, et al. "High Power Ytterbium-Doped Fiber Lasers Employing Longitudinal Vary Core Diameter Active Fibers." Photonics 10, no. 2 (2023): 147. http://dx.doi.org/10.3390/photonics10020147.

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Thanks to the advantage of balancing nonlinear effects and transverse mode instability, vary core diameter active fiber (VCAF) has been widely used in high power ytterbium-doped fiber lasers in recent years. Up to now, VCAF has developed from the basic form of the original tapered fiber to the spindle-shaped and saddle-shaped fiber with different characteristics and has been applied in conventional fiber lasers, oscillating–amplifying integrated fiber lasers, and quasi-continuous wave fiber lasers and successfully improved the performance of these lasers. In the present study, a 6110 W fiber laser amplifier is realized based on a tapered fiber. The maximum output power of a fiber laser amplifier based on spindle-shaped fibers is 6020 W with a beam quality of M2~1.86. In this paper, we first introduce the basic concept of VCAF and summarize its main fabrication methods and advantages in high-power fiber laser applications. Then, we will present the recent research results of high-power fiber laser employing VCAF in our group and clarify the outstanding advantages of VCAF compared with the constant core diameter active fiber (CCAF).
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Franczyk, Marcin, Dariusz Pysz, Filip Włodarczyk, Ireneusz Kujawa, and Ryszard Buczyński. "Yb3+ doped single-mode silica fibre laser system for high peak power applications." Photonics Letters of Poland 12, no. 4 (2020): 118. http://dx.doi.org/10.4302/plp.v12i4.1075.

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We present ytterbium doped silica single-mode fibre components for high power and high energy laser applications. We developed in-house the fibre laser with high efficiency of 65% according to the launched power, the threshold of 1.16W and the fibre length of 20 m. We also elaborated the fibre with 20 µm in diameter core suitable for amplifying the beam generated in oscillator. We implemented made in-house endcaps to prove the utility of the fibre towards high peak power applications. Full Text: PDF ReferencesStrategies Unlimited, The Worldwide Market for Lasers: Market Review and Forecast, 2020 DirectLink J. Zhu, P. Zhou, Y. Ma, X. Xu, and Z. Liu, "Power scaling analysis of tandem-pumped Yb-doped fiber lasers and amplifiers", Opt. Express 19, 18645 (2011) CrossRef IPG Photonics, Product information, accessed: October, 2020. DirectLink J.W. Dawson, M. J. Messerly, R. J. Beach, M. Y. Shverdin, E. A. Stappaerts, A. K. Sridharan, P. H. Pax, J. E. Heebner, C. W. Siders, and C. P. J. Barty, "Analysis of the scalability of diffraction-limited fiber lasers and amplifiers to high average power", Opt. Express 16, 13240 (2008) CrossRef W. Koechner, "Solid-State Laser Engineering", Springer Series in Optical Science, Berlin 1999 CrossRef A. V. Smith, and B. T. Do, "Bulk and surface laser damage of silica by picosecond and nanosecond pulses at 1064 nm", Appl. Opt. 47, 4812 (2008), CrossRef M. N. Zervas, C. Codemard, "High Power Fiber Lasers: A Review", IEEE J. Sel. Top. Quantum Electron. 20, 1, 2014 CrossRef D.J. Richardson, J. Nilsson, and W.A. Clarkson, "High power fiber lasers: current status and future perspectives [Invited]", J. Opt. Soc. Am. B, 27, 63, 2010, CrossRef M. Li, X. Chen, A. Liu, S. Gray, J. Wang, D. T. Walton; L. A. Zenteno, "Limit of Effective Area for Single-Mode Operation in Step-Index Large Mode Area Laser Fibers", J. Lightw. Technol., 27, 3010, 2009, CrossRef J. Limpert, S. Hofer, A. Liem, H. Zellmer, A. Tunnermann., S. Knoke, and H. Voelckel, "100-W average-power, high-energy nanosecond fiber amplifier", App.Phys.B 75, 477, 2002, CrossRef
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Yuanyuan Fan, Yuanyuan Fan, Bing He Bing He, Jun Zhou Jun Zhou, et al. "Efficient heat transfer in high-power fiber lasers." Chinese Optics Letters 10, no. 11 (2012): 111401–4. http://dx.doi.org/10.3788/col201210.111401.

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Fathi, Hossein, Mikko Närhi, and Regina Gumenyuk. "Towards Ultimate High-Power Scaling: Coherent Beam Combining of Fiber Lasers." Photonics 8, no. 12 (2021): 566. http://dx.doi.org/10.3390/photonics8120566.

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Fiber laser technology has been demonstrated as a versatile and reliable approach to laser source manufacturing with a wide range of applicability in various fields ranging from science to industry. The power/energy scaling of single-fiber laser systems has faced several fundamental limitations. To overcome them and to boost the power/energy level even further, combining the output powers of multiple lasers has become the primary approach. Among various combining techniques, the coherent beam combining of fiber amplification channels is the most promising approach, instrumenting ultra-high-power/energy lasers with near-diffraction-limited beam quality. This paper provides a comprehensive review of the progress of coherent beam combining for both continuous-wave and ultrafast fiber lasers. The concept of coherent beam combining from basic notions to specific details of methods, requirements, and challenges is discussed, along with reporting some practical architectures for both continuous and ultrafast fiber lasers.
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Michalska, Maria, Paweł Grześ, and Jacek Swiderski. "High power, 100 W-class, thulium-doped all-fiber lasers." Photonics Letters of Poland 11, no. 4 (2019): 109. http://dx.doi.org/10.4302/plp.v11i4.953.

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In this work, sub-kilowatt, compact thulium-doped fiber laser systems, operating at a wavelength of 1940 nm, have been presented. The continuous-wave laser power generated out of a single oscillator was 90 W with a slope efficiency of 56.7%. Applying a master oscillator – power amplifier configuration, an output power of 120.5 W with a slope efficiency of 58.2% was demonstrated. These are the first results of the works aimed at developing kW-class “eye-safe” laser systems in Poland. Full Text: PDF ReferencesZ. Liu, et al., "Implementing termination analysis on quantum programming", Sci. China Inf. Sci. 62, 41301 (2019) CrossRef S. D. Jackson, A. Sabella, D.G Lancaster, "Application and Development of High-Power and Highly Efficient Silica-Based Fiber Lasers Operating at 2 μm", IEEE J. Sel. Top. Quantum Electron. 13, 567, (2007). CrossRef E. Russell, N. Kavanagh, K. Shortiss, and F. C. G. Gunning, "Development of thulium-doped fibre amplifiers for the 2μm waveband", Proc. SPIE 10683, 106832Q (2018) CrossRef P. Peterka, B. Faure, W. Blanc, M. Karásek, and B. Dussardier, "Theoretical modelling of S-band thulium-doped silica fibre amplifiers", Opt. Quantum Electron. 36, 201 (2004) CrossRef M. Eichhorn, "Pulsed 2 μm fiber lasers for direct and pumping applications in defence and security", Proc. SPIE 7836, 78360B (2010). CrossRef O. Traxer and E. X. Keller, "Thulium fiber laser: the new player for kidney stone treatment? A comparison with Holmium:YAG laser", World J. Urol. 2019 Feb 6. doi: 10.1007/s00345-019-02654-5 CrossRef S. Das, "Optical parametric oscillator: status of tunable radiation in mid-IR to IR spectral range based on ZnGeP2 crystal pumped by solid state lasers", Opt. Quant. Electron. 51, 70 (2019) CrossRef M. Michalska, P. Hlubina, and J. Swiderski, "Mid-infrared Supercontinuum Generation to ∼4.7 μm in a ZBLAN Fiber Pumped by an Optical Parametric Generator", IEEE Photon. J 9, 3200207 (2017) CrossRef https://www.ipgphotonics.com DirectLink M.D. Burns, P. C. Shardlow, P. Barua, T. L. Jefferson-Brain, J. K. Sahu, and W. A.Clarkson, "47 W continuous-wave 1726 nm thulium fiber laser core-pumped by an erbium fiber laser", Opt. Lett. 44, 5230 (2019) CrossRef S.D. Jackson, "Cross relaxation and energy transfer upconversion processes relevant to the functioning of 2 μm Tm3+-doped silica fibre lasers", Opt. Commun. 230, 197 (2004). CrossRef X. Wang, P. Zhou, X. Wang, H. Xiao, and L. Si, "102 W monolithic single frequency Tm-doped fiber MOPA", Opt. Express 21, 32386 (2013) CrossRef K. Yin, R. Zhu, B. Zhang, G. Liu, P. Zhou, and J. Hou, "300 W-level, wavelength-widely-tunable, all-fiber integrated thulium-doped fiber laser", Opt. Express 24, 11085 (2016) CrossRef G. D. Goodno, L. D. Book, and J. E. Rothenberg, "600-W, single-mode, single-frequency thulium fibre laser amplifier", Proc. SPIE 7195, 71950Y (2009). CrossRef T. Ehrenreich, R. Leveille, I. Majid, K. Tankala, G. Rines, and P. Moulton, "1-kW, all-glass Tm: fiber laser", Proc. SPIE 7580, 1 (2010) DirectLink M. Michalska et al., "Highly stable, efficient Tm-doped fiber laser—a potential scalpel for low invasive surgery", Laser Phys. Lett. 13, 115101 (2016). CrossRef
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Nilsson, J., and D. N. Payne. "High-Power Fiber Lasers." Science 332, no. 6032 (2011): 921–22. http://dx.doi.org/10.1126/science.1194863.

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Galvanauskas, Almantas. "High Power Fiber Lasers." Optics and Photonics News 15, no. 7 (2004): 42. http://dx.doi.org/10.1364/opn.15.7.000042.

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Hecht, Jeff. "High-Power Fiber Lasers." Optics and Photonics News 29, no. 10 (2018): 30. http://dx.doi.org/10.1364/opn.29.10.000030.

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Lou, Qi-hong, and Jun Zhou. "High power fiber lasers." Frontiers of Physics in China 2, no. 4 (2007): 410–23. http://dx.doi.org/10.1007/s11467-007-0054-z.

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Tao, Mengmeng, Hongwei Chen, Guobin Feng, et al. "Comparisons between high power fiber systems in the presence of radiation induced photodarkening." Laser Physics 32, no. 5 (2022): 055101. http://dx.doi.org/10.1088/1555-6611/ac5dc4.

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Abstract Performance of high power fiber lasers and amplifiers with different pump sources are evaluated in the presence of radiation induced photodarkening in post-irradiated active fibers. Evolutions of output power and thermal mode instability threshold under different radiation doses are examined and analyzed. Severe degradation in both output power and thermal mode instability threshold is recorded for high power fiber systems with their active fibers exposed to radiations. Comparisons show that, amplifiers present a relatively better performance than lasers in adverse environments. Besides, 976 nm pump source is more favorable for high power laser sources in radioactive applications, even though 915 nm pump ensures a much lower temperature profile inside the active fiber.
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Dissertations / Theses on the topic "High power fiber lasers"

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

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Fiber amplifiers with high power and high pulse energy are strongly in demand for both scientific research and industrial applications. Ytterbium-doped fiber has been an outstanding choice for its broad-gain bandwidth and excellent power conversion efficiencies. In this dissertation, we introduced a compact high power high pulsed energy laser system with chirally coupled core (3C) Yb-doped fibers as the gain media. Traditional standard fibers and photonic crystal fibers are not suitable for compact high power high pulse energy laser systems because of poor higher order modes (HOMs) management and complicated air-hole structure. Newly invented 3C silica fibers solve these problems. A helical side-core around the Yb-doped central core extracts the HOMs from the central core. By adjusting this chirally structure, the core of the 3C fiber can be enlarged and the transverse mode of the fiber can be single mode at certain wavelengths. To simulate the amplification process with high power high pulse energy better, a new modeling method based on a combination of the rate equations and the nonlinear Schrödinger equations is invented. The gain was calculated from rate equations and the pulse evolution was analyzed using nonlinear Schrödinger equation. The simulation provided a good guidance for building compact high power high pulse energy laser systems. To achieve high power and high pulse energy, the system is designed as a two-stage structure. The laser
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BRAGLIA, ANDREA. "High Power Fiber Lasers for Industrial Applications." Doctoral thesis, Politecnico di Torino, 2013. http://hdl.handle.net/11583/2506061.

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Fiber lasers can be considered a revolutionary technology in the laser field thanks to their unique properties, such as high efficiency, simplicity, compactness and robustness. These features have allowed in the last ten years their outstanding growth both in scientific and industrial applications, eroding the market share of traditional laser sources like solid-state and gas lasers. Fiber lasers power scaling to the kilowatt range is now well established and, thanks to the fiber confinement, excellent output beam quality can be obtained, with a remarkable benefit for applications. Today, high power laser sources are based on ytterbium doped, large mode area fibers because ytterbium can be efficiently pumped in the range 915nm − 975nm (where pump sources are widely available), generating laser action at 1060nm − 1090nm. With this configuration, impressive power scaling has been demonstrated in the last few years. This Ph.D. thesis has been focused on the design and development of high power fiber lasers for a wide range of industrial applications, like cutting, wending, drilling and micro-machining. Both continuous and pulse wave fiber lasers have been demonstrated and particular attention has been devoted to the development of critical technological de-vices like fused fibers combiner, strategic components either for pump light coupling into the laser active fiber (pump combiner) and for power scaling through the beam combining of several fibers lasers (signal combiner). Ytterbium doped fiber lasers have been developed during the Ph.D activity and, in particular, after a theoretical analysis devoted to the modeling of fiber laser cavities and amplifiers, a continuous wave fiber laser and two pulsed laser systems have been demonstrated. The CW fiber laser has been developed with a modular approach: 7 laser modules, capable of emitting hundreds of Watts each, have been coupled together thanks to a fused fiber combiner. A multi-kilowatts output power has been demonstrated. The photo-darkening effect in the active fiber of the laser modules has also been exper-imentally investigated. The pulsed architectures are instead a Q-switched MOPA and a Seed MOPA fiber lasers. The first system is based on a fiber laser oscillator operating in the Q-switching regime, followed by a power amplifier. This laser is capable of delivering 100ns pulses with 10W average power (2kW maximum peak power). The Seed MOPA consists instead of a current modulated laser diode followed by two amplification stages; 2W output average power with adjustable pulse widths from 10 to 100ns has been demonstrated. In the last part of the activity, a preliminary version of a thulium doped fiber laser emitting at about 2000nm (i.e. in the so-called eye-safe region) has been developed. The laser is a Seed MOPA system that has been tested in cw regime but in the near future the pulsed behavior will be investigated.
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Vazquez, Zuniga Luis Alonso. "Ultrafast high power fiber lasers and their applications." Thesis, University of Southampton, 2012. https://eprints.soton.ac.uk/340703/.

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In this thesis I report experimental studies toward developing versatile, compact, and reliable ultrafast sources in the 1.5 micron wavelength region, and their power scalability. The first part of the thesis reports on the development of a stable all-fiberized wavelength-tunable frequency-shifted feedback (FSF) picosecond laser. Stability of the passive mode-locking mechanism is achieved by combining the effects of nonlinear polarization evolution and a frequency shifting mechanism carried out by an acousto-optic modulator. The novel configuration generates pulses in the range of ~ 34 to 66 ps, depending on the value of the frequency shift applied in the cavity. The cavity allows for continuous wavelength-tuning over 30 nm of the erbium gain bandwidth via a fiberized tunable filter. The stability of the laser cavity allows pulse analysis as a function of different parameters of the laser cavity. Additional extensive numerical analysis, combined with the experimental results, provide novel insights for understanding the dynamics of FSF lasers in the mode-locking regime, which have not been addressed in the literature before. The second part of the thesis reports on the development of a versatile, stable, compact mode-locked fibre laser using nonlinear polarization evolution and a semiconductor saturable absorber mirror(SESAM). The novel cavity can generate pulses with widths between ~ 2.7 and 11 ps over 25 nm of erbium gain bandwidth. This is achieved by integrating in the cavity state-of-the-art optical filters. The performance of this laser is compared to that of the FSF laser in terms of pulse energy, amplitude noise, timing jitter and power scaling. The third part of the thesis reports on the direct amplification of a mode-locked ~ 10 picosecond bandwidth-tunable laser source that I made by means of large-mode area (LMA) erbium-ytterbium co-doped and erbium-doped fibres. While cladding pumping amplification schemes have become a standard option for pulse amplification in the 1.5 μm region, core-pumped amplification in LMA erbium-doped fibres has been less studied. In this thesis, in addition to the amplification of picosecond pulses in an erbiumytterbium co-doped fibre; I present a novel scheme that uses a hybrid co-propagation core-pumped (1480 nm) and counter-propagation cladding-pumped (980 nm) scheme, which compensates for the low cladding absorption at 980 nm of the erbium-doped fibre. Picosecond pulses are amplified up to 1.5 W with peak powers exceeding 11 kW. The last part of this thesis reports on the study of a stable operating regime found in passive mode-locked lasers called noise-like pulses, which can generate broadband spectra directly from the main oscillator. Here, I report the record of a 135-nm bandwidth lineraly polarized noise-like pulse generation in an erbium-doped fibre laser by exploiting the birefringence of the cavity and the Raman gain of a highly nonlinear fibre (HNLF). Noise characterization of the source is carried out and compared to other commercial broadband sources in order to see its applicability in areas such as optical coherence tomography.
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Li, Hongbo. "Modeling Compact High Power Fiber Lasers and VECSELs." Diss., The University of Arizona, 2011. http://hdl.handle.net/10150/202712.

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Compact high power fiber lasers and the vertical-external-cavity surface-emitting lasers (VECSELs) are promising candidates for high power laser sources with diffraction-limited beam quality and are currently the subject of intensive research and development. Here three large mode area fiber lasers, namely, the photonic crystal fiber (PCF) laser, the multicore fiber (MCF) laser, and the multimode interference (MMI) fiber laser, as well as the VECSEL are modeled and designed.For the PCF laser, the effective refractive index and the effective core radius of the PCF are investigated using vectorial approaches and reformulated. Then, the classical step-index fiber theory is extended to PCFs, resulting in a highly efficient vectorial effective-index method for the design and analysis of PCFs. The new approach is employed to analyze the modal properties of the PCF lasers with depressed-index cores and to effectively estimate the number of guided modes for PCFs.The MCF laser, consisting of an active MCF and a passive coreless fiber, is modeled using the vectorial mode expansion method developed in this work. The results illustrate that the mode selection in the MCF laser by the coreless fiber section is determined by the MMI effect, not the Talbot effect. Based on the MMI and self-imaging in multimode fibers, the vectorial mode expansion approach is employed to design the first MMI fiber laser demonstrated experimentally.For the design and modeling of VECSELs, the optical, thermal, and structural properties of common material systems are investigated and the most reliable material models are summarized. The nanoscale heat transport theory is applied for the first time, to the best of my knowledge, to design and model VECSELs. In addition, the most accurate strain compensation approach is selected for VECSELs incorporating strained quantum wells to maintain structural stability. The design principles for the VECSEL subcavity are elaborated and applied to design a 1040nm VECSEL subcavity that has been demonstrated for high power operation of VECSELs where near diffraction-limited output over 20 W is obtained. Physical modeling of the VECSEL is also discussed and used to compare VECSEL subcavity designs on the laser level.
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Scurria, Giuseppe. "High power 2 μm fiber laser for mid-infrared supercontinuum generation in fluoride fibers". Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0342.

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Le développement de sources optiques ayant une forte brillance et un large spectre est nécessaire pour différentes applications telles que les contremesures optroniques, les systèmes LIDAR et la spectroscopie. Ce travail de thèse est consacré à l'étude de la génération de supercontinuum de forte puissance dans le domaine spectral allant de 2 à 5 μm. Un laser à fibre dopé thulium, émettant à 2 μm, a été réalisé et caractérisé en régimes continu, déclenché et à verrouillage de modes déclenchés. En régime continu, une puissance de 45 W a été atteinte avec un rendement différentiel de 58%. L'intégration de deux embouts en quartz fondu, fusionnés aux extrémités de la fibre active, a permis une amélioration drastique du contrôle de la température et de la stabilité générale du système dans tous les régimes de fonctionnement précédemment mentionnés. En régime combiné, de verrouillage de modes déclenchés, la puissance moyenne maximale en sortie de laser était de 40 W à une fréquence de déclenchement de 150 kHz. Pour une puissance moyenne en sortie de 20 W et une fréquence de déclenchement de 50 kHz, l'impulsion verrouillée la plus énergétique avait une énergie de 88 μJ et une puissance crête estimée de 60 kW. Dans tous les régimes de fonctionnement mentionnés, le facteur de propagation du faisceau M2 était proche de la limite de diffraction avec une excellente valeur de 1,1. Le faisceau de ce laser fibré a été utilisé pour pomper des fibres optiques en fluorure pour la génération de supercontinuum dans le domaine spectral de 2 à 5 μm. Les travaux expérimentaux ont été focalisés sur les matériaux en fluorure que sont le ZBLAN et le fluorure d’indium (InF3). Avec la fibre en ZBLAN, plus de 10 W ont été générés sur l'ensemble du domaine spectral avec une limite supérieure de domaine spectrale allant jusqu'à 4,4 μm. L'efficacité de conversion du supercontinuum a été mesurée à 35%, 28%, 15% et 8% pour un faisceau généré de longueur d'onde supérieure à 2,15 μm, 2,65 μm, 3,1 μm et 3,5 μm, respectivement. Concernant la fibre en InF3, la réalisation d'un nouveau système d'injection (combinant une fibre ZBLAN large coeur et un coupleur commercial fibre à fibre) a permis d'atteindre une grande stabilité thermo-mécanique de la fibre pendant les expériences à haute puissance. La génération de supercontinuum dans cette fibre s'est concrétisée par un faisceau de sortie dont le spectre atteignait la longueur d'onde de 4,7 μm et une puissance de 7 W sur l'ensemble du domaine spectral. À notre connaissance, ceci est le premier faisceau supercontinuum, ayant une puissance de l'ordre de quelques watts, généré dans une fibre en InF3 pompée par un oscillateur unique<br>High brightness and broad spectrum optical sources in the mid-infrared (mid-IR) are promising for different applications such as optronic countermeasures, LIDAR systems and spectroscopy. This thesis research work is dedicated to the investigation of high power supercontinuum generation in the 2-5 μm range. A thulium-doped fiber laser emitting at 2 μm has been built and characterized in continuous wave, Q-switching and Q-switched mode-locking regime. In continuous wave operation, as much as 45 W have been reached with a slope efficiency of 58%. The implementation of two fused-quartz end-caps fusion spliced at the extremities of the active-fiber improved the thermal management and the overall stability of the entire system in all mentioned regimes of operation, allowing for higher pump powers. In Q-switched mode-locking, the maximum average output power level was 40 W, for a Q-switch repetition rate of 150 kHz. At the average output power level of 20 W and 50 kHz of Q-switch repetition rate, the most energetic mode-locked pulse had an energy of 88 μJ and an estimated peak power of ~60 kW. In all the mentioned operation regimes, the measured beam parameter M2 of the fiber laser was 1.1, close to the diffraction limit. This laser has been used to pump fluoride optical fibers (ZBLAN and InF3) for supercontinuum generation in the 2-5 μm range. In ZBLAN, more than 10 W in all spectral bands have been obtained, with an output spectrum extending up to 4.4 μm. A conversion efficiency of 35%/28%/15%/8% has been measured for wavelengths longer than 2.15 μm/2.65 μm/3.1 μm/3.5 μm, respectively. For the InF3 fiber, a new design of an injection system, consisting of a large core diameter ZBLAN optical fiber and a commercial fiber-to-fiber coupler, allowed to enhance the thermo-mechanical stability of the fiber. The supercontinuum radiation generated in InF3 showed an output spectrum spanning up to around 4.7 μm with an output power level of 7 W in all spectral bands. To the best of our knowledge, this was the first Watt-level supercontinuum radiation in an InF3 fiber pumped by a singleoscillator
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Alvarez-Chavez, Jose Alfredo. "High-power fibre lasers." Thesis, University of Southampton, 2003. https://eprints.soton.ac.uk/15478/.

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This thesis reports on the experimental study of high-power, high-energy, cladding-pumped, rare-earth (Yb3+, Er3+/Yb3+)-doped fibre lasers. Some of the main capabilities of fibre lasers such as: High brightness and thermal properties were exploited for the development of a variety of continuous wave (CW) and Q-switched devices, whose characteristics also includes compactness. Our devices could already be considered an option for several applications. The 25-year long scientific and commercial evolution that fibre lasers have experienced is discussed in the first two chapters. The invention of Erbium-doped fibre amplifiers (EDFA's) and Internet were two major breakthroughs, which launched the need of WDM systems and laser sources. Fibre lasers, are now considered a flexible and powerful device whose technology has finally reached its maturity. Cladding pumping is the technique employed in these experiments in order to pump double clad fibre lasers using high power, broad stripes and bars. In this work, several inner cladding shapes have been used to overcome the normally high mismatch between diode laser beams and inner cladding areas of fibre lasers. Chapter Three consists of a review of cladding-pumped fibre lasers. It describes how inner cladding geometry and pump absorption limits the output power scalability of these devices. Nonlinear effects and amplified spontaneous emission are also studied due to their implication they have over fibre lasers performance. Results on conventional, continuous wave (CW) fibre lasers including fibre characterization and employed launching techniques are described in Chapter Four. A new method to obtain high intensity laser beam output from an Yb3+-doped, cladding-pumped, highly multimode fibre laser has been proposed. In this experiment, we propose the use of fibre tapers to increase intensity and improve beam quality. In CW regime, our results show an intensity increase of ~3.5 times with a low power penalty of ~1 dB. Also, without tapering, a maximum output power of 21-W was reached with a slope efficiency of >80%. Using a simple set of optic elements such as a l/2 waveplate, a polarizing beam-splitter and a bulk grating, we investigated the polarization characteristics of an Yb3+ fibre laser, from which we obtained 6.5 W of single polarization tunable output in the range of 1070 to 1106 nm. As a free running laser, the system produced 18 W at 1090 nm and showed a threshold of 1.8 Watts. The experiment is our first approach for developing a reliable high-power Yb3+-doped fibre source, that could be used in conjunction with optical parametric oscillators (OPO) and amplifiers (OPA) to frequency convert to a broad band of wavelengths. Using a new design of ytterbium-doped fibre made in-house with the conventional modified chemical vapor deposition (MCVD) process, we explored the possibilities of energy storage with such a large mode area (LMA) fibre. The fibre system was capable of delivering energetic pulses of >2 mJ, which could suggest the feasibility of a pulsed fibre laser in the region of tens of milli-Joules. The experiment is described in Chapter Six, on which the experiment that uses the tapered fibre laser in Q-Switched regime is also described and compared to LMA fibre laser. Gaussian-type pulses were obtained which reached pulse energies of 0.6 mJ at 4 kHz using a tapered fibre laser and 1.3 mJ at 500 Hz using conventional laser, corresponding to average powers of 2.1 Watts for the tapered laser and 0.8 watts for the conventional laser. Er3+/Yb3+-doped fibre lasers were part of our experimental work. This co-doping technique allows pumping of Yb3+ ions using broad-stripe high-power pump sources to reach much higher output power levels. Efficient energy transfer from excited Ytterbium ions into Erbium is achieved. From a preliminary study, the fibre laser showed a threshold of 160 mW and a slope efficiency of 49% with respect to absorbed pump power. The maximum output power was 6.2 watts at 1535 nm and a linewidth of 1 nm. One of our co-doped fibre devices produced 16.8 W of continuous wave, multimode laser power at the interesting wavelength of operation of 1550 nm. Finally, conclusions and future work are included in Chapter Eight.
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7

Sims, Robert. "Development of Thulium Fiber Lasers for High Average Power and High Peak Power Operation." Doctoral diss., University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5706.

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High power thulium fiber lasers are useful for a number of applications in both continuous-wave and pulsed operating regimes. The use of thulium as a dopant has recently gained interest due to its large bandwidth, possibility of high efficiency, possibility of high power and long wavelength ~1.8 – 2.1 [micro]m. The longer emission wavelength of Tm-doped fiber lasers compared to Yb- and/or Er-doped fiber lasers creates the possibility for higher peak power operation due to the larger nonlinear thresholds and reduced nonlinear phase accumulation. One primary interest in Tm-doped fiber lasers has been to scale to high average powers; however, the thermal and mechanical constraints of the fiber limit the average power out of a single-fiber aperture. One method to overcome the constraints of a single laser aperture is to spectrally combine the output from multiple lasers operating with different wavelengths into a single beam. In this thesis, results will be presented on the development of three polarized 100 W level laser systems that were wavelength stabilized for SBC. In addition to the development of the laser channels, the beams were combined using bandpass filters to achieve a single near diffraction-limited output. Concurrently, with the development of high average power systems there is an increasing interest in femotosecond pulse generation and amplification using Tm- doped fiber lasers. High peak power sources operating near 2 [micro]m have the potential to be efficient pump sources to generate mid-infrared light through supercontinuum generation or optical parametric oscillators. This thesis focuses on the development of a laser system utilizing chirped pulse amplification (CPA) to achieve record level energies and peak powers for ultrashort pulses in Tm-doped fiber. A mode-locked oscillator was built to generate femtosecond pulses operating with pJ energy. Pulses generated in the mode-locked oscillator were limited to low energies and contained spectral modulation due to the mode-locking mechanism, therefore, a Raman-soliton self-frequency shift (Raman-SSFS) amplifier was built to amplify pulses, decrease the pulse duration, and spectrally clean pulses. These pulses were amplified using chirped pulse amplification (CPA) in which, limiting factors for amplification were examined and a high peak power system was built. The primary limiting factors of CPA in fibers include the nonlinear phase accumulation, primarily through self-phase modulation (SPM), and gain narrowing. Gain narrowing was examined by temporally stretching pulses in a highly nonlinear fiber that both stretched the pulse duration and broadened the spectrum. A high peak power CPA system amplified pulses to 1 [micro]J energy with 300 fs compressed pulses, corresponding to a peak power >3 MW. High peak power pulses were coupled into highly nonlinear fibers to generate supercontinuum.<br>Ph.D.<br>Doctorate<br>Optics and Photonics<br>Optics and Photonics<br>Optics
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Li, Li. "Extremely Compact High-Power Er3+-Yb3+-Codoped Phosphate Glass Fiber Lasers." Diss., The University of Arizona, 2005. http://hdl.handle.net/10150/193824.

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Extremely compact high-power fiber lasers operating at eye-safe telecom wavelength of 1.5 μm have been achieved by systematic experimental studies. Heavily Er3+-Yb3+-codoped phosphate glasses have been chosen as the host glass for our fibers and 1.5 μm lasers have been realized when pumped with 975 nm laser diodes.The first short-length cladding-pumped fiber laser with watt-level CW output power has been demonstrated by an 11-cm-long doped step-index phosphate fiber. Without active cooling, 1.5 W output power at 1535 nm has been obtained.Thermoelectric cooler has been used for heavily doped phosphate step-index fibers. A dual-end-pumped actively cooled fiber laser has generated more than 11 W CW output power at 1535 nm from an 11.9 cm long active fiber. A fully 3-dimensional thermal analysis has been performed to calculate the internal temperature distribution of the short-length fiber laser and the simulated results have been experimentally verified.Phosphate glass microstructured optical fibers (MOFs) with large active cores have been fabricated. The first demonstrated short phosphate MOF laser has generated > 3 W single-mode CW output power from an 11-cm-long fiber. The impacts of depressed-core-index and annealing upon MOF's modal property have been systematically investigated. Extremely compact high-power fiber laser is demonstrated by a heavily doped MOF laser and > 4.5 W single-mode CW output power is delivered from a 3.5 cm long fiber. Finally, a high-power single-frequency fiber laser is realized by splicing a FBG with a 3.8 cm long MOF, which achieves > 2 W single-frequency output power.
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Jain, Apurva. "Applications of Volume Holographic Elements in High Power Fiber Lasers." Doctoral diss., University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5318.

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The main objective of this thesis is to explore the use of volume holographic elements recorded in photo-thermo-refractive (PTR) glass for power scaling of narrow linewidth diffraction-limited fiber lasers to harness high average power and high brightness beams. Single fiber lasers enable kW level output powers limited by optical damage, thermal effects and non-linear effects. Output powers can be further scaled using large mode area fibers, however, at the cost of beam quality and instabilities due to the presence of higher order modes. The mechanisms limiting the performance of narrow-linewidth large mode area fiber lasers are investigated and solutions using intra-cavity volume Bragg gratings (VBG) proposed. Self-pulsations-free, completely continuous-wave operation of a VBG-stabilized unidirectional fiber ring laser is demonstrated with quasi single-frequency (< 7.5 MHz) output. A method for transverse mode selection in multimode fiber lasers to reduce higher order mode content and stabilize the output beam profile is developed using angular selectivity of reflecting VBGs. By placing the VBG output coupler in a convergent beam, stabilization of the far-field beam profile of a 20 ?m core large mode area fiber laser is demonstrated. Beam combining techniques are essential to power scale beyond the limitations of single laser sources. Several beam combining techniques relevant to fiber lasers were compared in this study and found to be lacking in one or more of the following aspects: the coherence of the individual sources is compromised, the far-field beam quality is highly degraded with significant power in side lobes, spectrally broad and unstable, and uncertainty over scaling to larger arrays and higher power. Keeping in mind the key requirements of coherence, good far-field beam quality, narrow and stable spectra, and scalability in both array size and power, a new passive coherent beam combining technique using multiplexed volume Bragg gratings (M-VBGs) is proposed. In order to understand the mechanism of radiation exchange between multiple beams via these complex holographic optical elements, the spectral and beam splitting properties a 2nd order reflecting M-VBG recorded in PTR glass is experimentally investigated using a tunable single frequency seed laser. Two single-mode Yb-doped fiber lasers are then coherently combined using reflecting M-VBGs in both linear and unidirectional-ring resonators with >90% combining efficiency and diffraction-limited beam quality. It is demonstrated that the combining bandwidth can be controlled in the range of 100s of pm to a few pm by angular detuning of the M-VBG. Very narrow-linewidth (< 210 MHz) operation in a linear cavity and possibility of single-frequency operation in a unidirectional ring cavity of the coherently combined system is demonstrated using this technique. It is theoretically derived and experimentally demonstrated that high combining efficiency can be achieved even by multiplexing low-efficiency VBGs, with the required diffraction efficiency of individual VBGs decreasing as array size increases. Scaling of passive coherent beam combining to four fiber lasers is demonstrated using a 4th order transmitting M-VBG. Power scaling of this technique to 10 W level combined powers with 88% combining efficiency is demonstrated by passively combining two large mode area fiber lasers using a 2nd order reflecting M-VBG in a unidirectional ring resonator. High energy compact single-frequency sources are highly desired for several applications – one of which is as a seed for high power fiber amplifiers. Towards achieving the goal of a monolithic solid-state laser, a new gain medium having both photosensitive and luminescence properties is investigated – rare-earth doped PTR glass. First lasing is demonstrated in this new gain element in a VBG-stabilized external cavity.<br>Ph.D.<br>Doctorate<br>Optics and Photonics<br>Optics and Photonics<br>Optics
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Aydin, Yiğit Ozan. "Development of high-power 3 μm fiber laser sources and components". Doctoral thesis, Université Laval, 2019. http://hdl.handle.net/20.500.11794/37620.

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Les systèmes laser en fibre optique de verre fluoré se sont placés en tête de file pour la génération de lumière cohérente dans l’infrarouge moyen, de 2 à 5 μm. En particulier, les lasers à fibre opérant à 3 μm ont attiré une attention considérable puisqu’ils permettent le développement d’applications en spectroscopie, en contre-mesure militaire et en médecine. De ce fait, ces lasers ont connu des progrès considérables en termes de puissance, de qualité de faisceau, de fiabilité et de compacité dans la dernière décennie. Cette thèse s’inscrit dans cette démarche d’accroissement des performances des lasers à fibre infrarouges opérant à 3 μm. Ainsi, elle présente différents systèmes laser en fibre de verre fluoré et détaille les composants tout-fibre qui ont permis d’atteindre des records d’efficacité énergétique, de puissance et d’énergie par impulsion.Trois types de sources laser, chacune ayant établi un record de performance, ont été investiguées. Tout d’abord, une efficacité laser record de 50% a été obtenue à partir d’un laser à fibre opérant à 2.8 μm en utilisant le principe de cascade laser à 2.8 et 1.6 μm. Ensuite, un amplificateur à fibre, basé sur des fibres dopées à l’ion erbium et aux ions holmium et praséodyme, a permis d’amplifier des impulsions picosecondes à 3 μm d’une source laser à l’état solide pour obtenir une énergie par impulsion (122 μJ) et une puissance moyenne (2.45 W) records. Finalement, une cavité laser tout-fibre dopée à l’ion erbium opérant autour de 3 μm, dépourvue d’épissures fusionnées, a mené à la démonstration d’une puissance laser recordde 41.6 W. D’autre part, cette thèse a ciblé différents obstacles limitant l’accroissement de la puissance des lasers à fibre opérant à 3 μm, et a permis d’identifier des pistes de solutions pour pallier ces limitations. En l’occurrence, la photodégradation de l’extrémité de sortie des lasers à fibre à 3 μm, causée par la diffusion de la vapeur d’eau ambiante, limite la durée de vie et la puissance maximale de ce type de laser. Ainsi, le dernier volet de cette thèse a été consacré à l’étude expérimentale de la photodégradation d’embouts de protection à base de verre fluoré ou d’oxyde. Cette étude a mené au développement d’une nouvelle méthode permettant d’inhiber la diffusion de la vapeur d’eau dans les embouts de protection. Cette thèse représente une avancée majeure dans le contexte de l’accroissement de la puissance des sources laser en fibre optique opérant à 3 μm et démontre leur potentiel indéniable pour remplacer d’autres types de lasers dans une multitude d’applications.<br>Fluoride fiber laser technology is one of the noteworthy tools for generating coherent mid-infrared signal between 2 to 5 μm that has made outstanding progress over the last decade interms of compactness, reliability, high beam quality, and output power. In the mid-infrared spectral region, laser emission near 3 μm is crucial for many applications such as spectroscopy, counter measures and medicine. In addition, there has always been an increasing demand for higher laser output parameters to open new doors for potential applications.This dissertation presents a series of experimental studies of fluoride fiber laser systems, either in continuous wave or pulsed regime, and of their critical in-fiber components to achieve a laser emission with high slope efficiency, output power, and pulse energy near 3 μm. During this PhD project, three main 3 μm-class fluoride fiber laser sources, each representing at least one record output parameter in their own category, have been investigated. First, the highest optical-to-optical efficiency (50%) at 2.8 μm was achieved from a diode-pumped fiber laser cavity by cascaded transitions of 2.8 μm and 1.6 μm in a low-doped erbium fluoride fiber. Then, active media based on erbium and holmium/praseodymium zirconium fluoride fibers seeded by a sub-ns solid-state laser enabled to achieve highest pulse energy (122μJ)and average power (2.45 W) from a picosecond fiber laser amplifier operating near 3 μm. Lastly, the highest average power 3 μm-class laser (41.6 W) has been demonstrated by using asplice-less heavily erbium-doped fluoride fiber medium. The major problems during the high-power laser operation have been investigated and potential solutions were proposed. The most common problem of all the high-power 3 μm fiber laser demonstrations is the degradation of the fiber tips due to OH migration, which limits the output power and can lead to catastrophic failures. Therefore, in the last part of the PhD project, the performance of fluoride- and oxide-based endcap components under high-power 3 μm laser emission has been experimentally investigated and a novel endcapping method was proposed for suppressing the OH migration. Experimental studies in this PhD project represents a significant advance for further power scaling of 3 μm fluoride fiber laser sources and shows their potential to replace other laser technologies.
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Books on the topic "High power fiber lasers"

1

Mahmoud, Fallahi, Moloney Jerome V, and Society of Photo-optical Instrumentation Engineers., eds. High-power fiber and semiconductor lasers: 27 January, 2003, San Jose, California, USA. SPIE, 2003.

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name, No. High-power fiber and semiconductor lasers: 27 January, 2003, San Jose, California, USA. SPIE, 2003.

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Electronics and Electrical Engineering Laboratory (National Institute of Standards and Technology). Optoelectronics Division., ed. High-accuracy laser power and energy meter calibration service. U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 2003.

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Electronics and Electrical Engineering Laboratory (National Institute of Standards and Technology). Optoelectronics Division, ed. High-accuracy laser power and energy meter calibration service. U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 2003.

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Livigni, David J. High-accuracy laser power and energy meter calibration service. U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 2003.

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Electronics and Electrical Engineering Laboratory (National Institute of Standards and Technology). Optoelectronics Division., ed. High-accuracy laser power and energy meter calibration service. U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 2003.

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Electronics and Electrical Engineering Laboratory (National Institute of Standards and Technology). Optoelectronics Division, ed. High-accuracy laser power and energy meter calibration service. U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 2003.

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A, Niku-Lari, and Mordike B. L, eds. High power lasers. Pergamon, 1989.

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A, Niku-Lari, and Mordike Barry L, eds. High power lasers. Pergamon Press, 1989.

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Power lasers. E. Horwood, 1987.

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Book chapters on the topic "High power fiber lasers"

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Meyer, Johan, Justice Sompo, and Sune von Solms. "High-Power Fiber Lasers." In Fiber Lasers. CRC Press, 2021. http://dx.doi.org/10.1201/9781003256380-8.

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Feng, Yan, and Lei Zhang. "High Power Raman Fiber Lasers." In Raman Fiber Lasers. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-65277-1_1.

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Ter-Mikirtychev, Vartan V. "High-Power Fiber Lasers." In Springer Series in Optical Sciences. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-33890-9_10.

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Ter-Mikirtychev, Valerii. "High-Power Fiber Lasers." In Springer Series in Optical Sciences. Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-02338-0_10.

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Schreiber, Thomas, Ramona Eberhardt, Jens Limpert, and Andreas Tünnermann. "High-Power Fiber Lasers and Amplifiers: Fundamentals and Enabling Technologies to Enter the Upper Limits." In Fiber Lasers. Wiley-VCH Verlag GmbH & Co. KGaA, 2012. http://dx.doi.org/10.1002/9783527648641.ch2.

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Kotov, Leonid V., and Mikhail E. Likhachev. "High Power Continuous-Wave Er-doped Fiber Lasers." In Springer Series in Optical Sciences. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-12692-6_8.

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Yu, Xia, Biao Sun, Jiaqi Luo, and Elizabeth Lee. "Optical Fibers for High-Power Lasers." In Handbook of Optical Fibers. Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-1477-2_39-1.

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Yu, Xia, Biao Sun, Jiaqi Luo, and Elizabeth Lee. "Optical Fibers for High-Power Lasers." In Handbook of Optical Fibers. Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-10-7087-7_39.

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Willamowski, U., H. Zellmer, R. Henking, M. Dieckmann, and F. v. Alvensleben. "Dielectric Coatings on Fiber and Faces for High Power Laser Applications and Fiber Lasers." In Laser in Forschung und Technik / Laser in Research and Engineering. Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-642-80263-8_176.

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Glas, P., M. Naumann, A. Schirrmacher, and J. Townsend. "A Novel Design for High Brightness Fiber Lasers Pumped by High Power Diodes." In Laser in Forschung und Technik / Laser in Research and Engineering. Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-642-80263-8_74.

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Conference papers on the topic "High power fiber lasers"

1

Kasai, Yohei, Takuya Aizawa, and Daiichiro Tanaka. "High-power fiber-coupled pump lasers for fiber lasers." In High-Power Diode Laser Technology XVI, edited by Mark S. Zediker. SPIE, 2018. http://dx.doi.org/10.1117/12.2288139.

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Limpert, Jens. "High Power Fiber Lasers." In Optical Fiber Communication Conference. OSA, 2017. http://dx.doi.org/10.1364/ofc.2017.w1f.5.

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Paye, Corey, Jon Greene, and Chris Rose. "Gratings and fibers for high-power fiber lasers and amplifiers." In High-Power Lasers and Applications, edited by L. N. Durvasula. SPIE, 2003. http://dx.doi.org/10.1117/12.484166.

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Eom, Tae-Jung, and Byeong Ha Lee. "Novel optical fiber connector using long-period fiber gratings." In High-Power Lasers and Applications, edited by Michel J. F. Digonnet. SPIE, 2002. http://dx.doi.org/10.1117/12.467469.

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Gapontsev, V. P., and L. E. Samartsev. "High-Power Fiber Laser." In Advanced Solid State Lasers. OSA, 1991. http://dx.doi.org/10.1364/assl.1990.lsr1.

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Kosinski, S. G., and D. Inniss. "High-power fiber lasers." In Technical Digest Summaries of papers presented at the Conference on Lasers and Electro-Optics Conference Edition. 1998 Technical Digest Series, Vol.6. IEEE, 1998. http://dx.doi.org/10.1109/cleo.1998.675889.

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Nilsson, J., J. K. Sahu, Y. Jeong, et al. "High power fiber lasers." In 2005 Optical Fiber Communications Conference Technical Digest. IEEE, 2005. http://dx.doi.org/10.1109/ofc.2005.192624.

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Richardson, David. "High Power fiber lasers." In Novel Lasers and Devices-Basic Aspects. OSA, 1999. http://dx.doi.org/10.1364/nlda.1999.lwa1.

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Nilsson, Johan. "High power fiber lasers." In Conference on Lasers and Electro-Optics. OSA, 2010. http://dx.doi.org/10.1364/cleo.2010.ctuc1.

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Jeong, Yoonchan, Luis A. Vazquez-Zuniga, Seung Jong Lee, Geunchang Choi, Youngchul Kwon, and Hyuntai Kim. "High-power fiber lasers." In 2012 Opto-Electronics and Communications Conference (OECC). IEEE, 2012. http://dx.doi.org/10.1109/oecc.2012.6276581.

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Reports on the topic "High power fiber lasers"

1

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

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Mocofanescu, Anca, and Ravinder Jain. Advanced High-Power Near-Infrared Fiber Lasers. Defense Technical Information Center, 2005. http://dx.doi.org/10.21236/ada439073.

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Lancaster, David. Germanate Glass Fiber Lasers for High Power. Defense Technical Information Center, 2016. http://dx.doi.org/10.21236/ada637443.

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Wylangowski. Advances in High Power Optical Fiber Lasers. Phase 1. Defense Technical Information Center, 1999. http://dx.doi.org/10.21236/ada371342.

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Anan'ev, Yuri. Theoretical Studies of Scaling Double Clad Fiber Lasers to High Power. Defense Technical Information Center, 2001. http://dx.doi.org/10.21236/ada388956.

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Sprangle, Phillip, Antonio Ting, Joseph Penano, Richard Fischer, and Bahman Hafizi. Incoherent Combining of High-Power Fiber Lasers for Directed-Energy Applications. Defense Technical Information Center, 2008. http://dx.doi.org/10.21236/ada477887.

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Pax, P., and J. Dawson. Short-Wavelength, High-Power Fiber Laser Sources. Office of Scientific and Technical Information (OSTI), 2017. http://dx.doi.org/10.2172/1467813.

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Messerly, M. High Average Power, High Energy Short Pulse Fiber Laser System. Office of Scientific and Technical Information (OSTI), 2007. http://dx.doi.org/10.2172/923999.

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Rediker, Robert H. Communications: Fiber-Coupled External-Cavity Semiconductor High-Power Laser. Defense Technical Information Center, 1992. http://dx.doi.org/10.21236/ada257386.

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

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