Journal ArticleDOI
Beam quality factor of higher order modes in a step-index fiber
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In this paper, the beam quality factor (or M2-parameter) for linearly polarized (LP)-modes of a step-index fiber is calculated in a closed form, as a function of the fiber V-number.Abstract:
The beam quality factor (or M2-parameter) for linearly polarized (LP)-modes of a step-index fiber is calculated in a closed form, as a function of the fiber V-number. It is shown that M2 sharply peaks for all fiber modes when they are close to cutoff. Particularly simple expressions are derived in the limit Vrarrinfin. Two practically important coherent superpositions of modes are considered for which the degree of degradation of the beam quality due to the higher order mode content is calculated. The reported results can be useful for designing large-core high-power fiber lasers, amplifiers, and fiber-based beam delivery systems, when preservation of the spatial beam quality is importantread more
Citations
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Journal ArticleDOI
High Power Fiber Lasers: A Review
TL;DR: In this article, the fundamental properties and latest developments in high-power fiber lasers are summarized and reviewed, focusing primarily on the most common fiber laser configurations and the associated cladding pumping issues.
Journal ArticleDOI
Spatially and spectrally resolved imaging of modal content in large-mode-area fibers
TL;DR: A new measurement technique, capable of quantifying the number and type of modes propagating in large-mode-area fibers is both proposed and demonstrated, based on both spatially and spectrally resolving the image of the output of the fiber under test.
Journal ArticleDOI
Complete modal decomposition for optical fibers using CGH-based correlation filters.
TL;DR: Novel results are presented for the complete modal decomposition of optical fields by using computer-generated holographic filters and the suitability of this method is proven by reconstructing various fields emerging from a weakly multi-mode fiber with arbitrary mode contents.
Journal ArticleDOI
Erbium:Ytterbium Codoped Large-Core Fiber Laser With 297-W Continuous-Wave Output Power
Yoonchan Jeong,Seongwoo Yoo,C.A. Coderaard,Johan Nilsson,J.K. Sahu,David N. Payne,R. Horley,Paul Turner,L.M.B. Hickey,A. Harker,M. Lovelady,A. Piper +11 more
TL;DR: In this paper, a high power and high efficiency erbium:ytterbium (Er:Yb) codoped fiber laser was demonstrated, which produces 297 W of continuous-wave output at 1567 nm.
Journal ArticleDOI
Al/Ge co-doped large mode area fiber with high SBS threshold.
Ming-Jun Li,Xin Chen,Ji Wang,Stuart Gray,Anping Liu,Jeffrey Demeritt,A.B. Ruffin,Alana M. Crowley,Donnell T. Walton,Luis A. Zenteno +9 more
TL;DR: A novel approach of making large effective area laser fiber with higher threshold for the stimulated Brillouin scattering (SBS) using Al/Ge co-doping in the fiber core using an Yb-doped double clad fiber fabricated by the OVD process.
References
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Book
Table of Integrals, Series, and Products
TL;DR: Combinations involving trigonometric and hyperbolic functions and power 5 Indefinite Integrals of Special Functions 6 Definite Integral Integral Functions 7.Associated Legendre Functions 8 Special Functions 9 Hypergeometric Functions 10 Vector Field Theory 11 Algebraic Inequalities 12 Integral Inequality 13 Matrices and related results 14 Determinants 15 Norms 16 Ordinary differential equations 17 Fourier, Laplace, and Mellin Transforms 18 The z-transform
Journal ArticleDOI
Weakly guiding fibers.
TL;DR: Simple formulas and functions for the fiber parameters are presented as a help for practical design work that considers the propagation constant, mode delay, the cladding field depth, and the power distribution in the fiber cross section.
Journal ArticleDOI
Single-mode operation of a coiled multimode fiber amplifier
TL;DR: This technique will permit scaling of pulsed fiber lasers and amplifiers to significantly higher pulse energies and peak powers and cw fiber sources to higher average powers while maintaining excellent beam quality.