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You searched for +publisher:"Clemson University" +contributor:("Peter Dragic"). Showing records 1 – 2 of 2 total matches.

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Clemson University

1. Hawkins, Thomas Wade. The Materials Science and Engineering of Advanced YB-Doped Glasses and Fibers for High-Power Lasers.

Degree: PhD, School of Materials Science and Engineering, 2020, Clemson University

This research studies and yields new understandings into the materials science and engineering of advanced multicomponent glass systems, which is critical for next generation fiber lasers operating at high output powers. This begins with the study and development of Yb-doped glasses in the Al2O3-P2O5-SiO2 (APS) ternary system, fabricated using modified chemical vapor deposition (MCVD), that, despite being highly doped, possess an average refractive index matched to that of silica (SiO2). The highly doped active core material was subsequently processed through a multiple stack-and-draw process to realize a single fiber with high doping, compositionally-tailored index, and scalability for fiber lasers. Based on the knowledge gained in this first focal area, further strategic compositional tailoring to influence the glass’ photoelastic and thermo-optic coefficient, was performed in order to understand and realize significant decreases in Brillouin and thermal-Rayleigh scattering, which instigate parasitic stimulated Brillouin scattering (SBS) and transverse mode instabilities (TMI) in high power fiber lasers. In addition to understanding the composition / structure / properties of these glasses, a double-clad fiber laser will be fabricated, scaled to over 1 kW of output laser power, and studied in order to relate the materials science and engineering of multiple glass systems and fibers designs to laser performance and properties. Advisors/Committee Members: Liang Dong, John Ballato, Peter Dragic, Stephen Foulger, Phil Brown.

Subjects/Keywords: fiber laser; MCVD; optical fiber

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Hawkins, T. W. (2020). The Materials Science and Engineering of Advanced YB-Doped Glasses and Fibers for High-Power Lasers. (Doctoral Dissertation). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_dissertations/2585

Chicago Manual of Style (16th Edition):

Hawkins, Thomas Wade. “The Materials Science and Engineering of Advanced YB-Doped Glasses and Fibers for High-Power Lasers.” 2020. Doctoral Dissertation, Clemson University. Accessed September 21, 2020. https://tigerprints.clemson.edu/all_dissertations/2585.

MLA Handbook (7th Edition):

Hawkins, Thomas Wade. “The Materials Science and Engineering of Advanced YB-Doped Glasses and Fibers for High-Power Lasers.” 2020. Web. 21 Sep 2020.

Vancouver:

Hawkins TW. The Materials Science and Engineering of Advanced YB-Doped Glasses and Fibers for High-Power Lasers. [Internet] [Doctoral dissertation]. Clemson University; 2020. [cited 2020 Sep 21]. Available from: https://tigerprints.clemson.edu/all_dissertations/2585.

Council of Science Editors:

Hawkins TW. The Materials Science and Engineering of Advanced YB-Doped Glasses and Fibers for High-Power Lasers. [Doctoral Dissertation]. Clemson University; 2020. Available from: https://tigerprints.clemson.edu/all_dissertations/2585

2. Cavillon, Maxime. Molten Core Fabrication of Intrinsically Low Nonlinearity Glass Optical Fibers.

Degree: PhD, School of Materials Science and Engineering, 2018, Clemson University

Optical nonlinearities limit scaling to higher output powers in modern fiber-based laser systems. Paramount amongst these parasitic phenomena are stimulated Brillouin scattering (SBS), stimulated Raman scattering (SRS), and nonlinear refractive index (n2)-related wave-mixing phenomena (e.g., self-phase modulation, SPM, four-wave mixing, FWM). In order to mitigate these effects, the fiber community has largely focused on the development of micro-structured large mode area (LMA) fibers whereby the fiber geometry is engineered to spread the optical power over a larger effective area. In addition to increasing the resultant complexity and cost of these fibers, such LMA designs introduce new parasitic phenomena, such as transverse mode instability (TMI), which presently serves as the dominant limitation in power-scaling. This dissertation explores a different approach for mitigating these nonlinearities in optical fiber lasers; namely attacking the aforementioned effects at their fundamental origin, i.e., the material through which the light propagates. Indeed, the Brillouin gain coefficient (BGC), the Raman gain coefficient (RGC), the thermo-optic coefficient (TOC) and the nonlinear refractive index (n2) are all intrinsic material properties that respectively drive SBS, SRS, TMI and wave-mixing phenomena. Though less well studied within the fiber laser community, such a materials approach offers a powerful yet simpler way to address nonlinearities. Chapter I investigates the thermodynamic origins of light scattering and provides insight into the prime material properties that drive optical nonlinearities. Chapters II and III offer an overview of how these (and other) properties can be measured and modeled in multicomponent glass systems, considering both bulk or fiber geometries. In Chapter IV, a materials road map for binary and ternary glass material systems is provided to identify which compositions should be of specific focus for the development of intrinsically low optical nonlinearity optical fibers. These four Chapters have been adapted from a series of published journal articles1 entitled “A unified materials approach to mitigating optical nonlinearities in optical fiber” [1]–[4]. In Chapter V, the fabrication of oxyfluoride-core silica-cladding optical fibers using the molten core method is described and their core glass compositions and structures investigated. The thermodynamics and kinetics of fluoride-oxide reactions are also studied, and insights on the dominant mechanisms that drive the fluoride-oxide reactions during fiber processing are discussed. In Chapter VI, optical properties that drive optical nonlinearities are studied, and their relationships with glass compositions investigated. Oxyfluoride fibers exhibiting concomitant reductions of 6-9 dB in BGC, 0.5-1.5 dB in RGC, and 1.2-3.2 dB in TOC, relative to conventional silica fibers, as well as reduced linear and nonlinear refractive indices, are reported. Spectroscopic properties of active Yb-doped fibers are also considered,… Advisors/Committee Members: Dr. John Ballato, Committee Chair, Dr. Peter Dragic, Dr. Liang Dong, Dr. Stephen Foulger, Dr. Philip Brown.

Subjects/Keywords: Glass materials; Optical fibers; Optical nonlinearities; Oxyfluorides; Silicates

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Cavillon, M. (2018). Molten Core Fabrication of Intrinsically Low Nonlinearity Glass Optical Fibers. (Doctoral Dissertation). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_dissertations/2162

Chicago Manual of Style (16th Edition):

Cavillon, Maxime. “Molten Core Fabrication of Intrinsically Low Nonlinearity Glass Optical Fibers.” 2018. Doctoral Dissertation, Clemson University. Accessed September 21, 2020. https://tigerprints.clemson.edu/all_dissertations/2162.

MLA Handbook (7th Edition):

Cavillon, Maxime. “Molten Core Fabrication of Intrinsically Low Nonlinearity Glass Optical Fibers.” 2018. Web. 21 Sep 2020.

Vancouver:

Cavillon M. Molten Core Fabrication of Intrinsically Low Nonlinearity Glass Optical Fibers. [Internet] [Doctoral dissertation]. Clemson University; 2018. [cited 2020 Sep 21]. Available from: https://tigerprints.clemson.edu/all_dissertations/2162.

Council of Science Editors:

Cavillon M. Molten Core Fabrication of Intrinsically Low Nonlinearity Glass Optical Fibers. [Doctoral Dissertation]. Clemson University; 2018. Available from: https://tigerprints.clemson.edu/all_dissertations/2162

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