Beam quality factor of higher order modes in a step-index fiber

Hidehiko Yoda; Pavel Polynkin; Masud Mansuripur

doi:10.1109/JLT.2005.863337

Beam quality factor of higher order modes in a step-index fiber

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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 V → ∞. 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 important.

Original language	English (US)
Pages (from-to)	1350-1355
Number of pages	6
Journal	Journal of Lightwave Technology
Volume	24
Issue number	3
DOIs	https://doi.org/10.1109/JLT.2005.863337
State	Published - Mar 2006

Keywords

Beam quality factor
Fiber modes
Multimode fiber

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

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10.1109/JLT.2005.863337

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title = "Beam quality factor of higher order modes in a step-index fiber",

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 V → ∞. 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 important.",

keywords = "Beam quality factor, Fiber modes, Multimode fiber",

author = "Hidehiko Yoda and Pavel Polynkin and Masud Mansuripur",

note = "Funding Information: Manuscript received November 17, 2004; revised November 10, 2005. This work was supported by Air Force Office of Scientific Research (AFOSR) under Contract F49620-02-1-03-80. H. Yoda is with The Faculty of Engineering, Utsunomiya University, Utsunomiya 321-8585, Japan. P. Polynkin and M. Mansuripur are with the College of Optical Sciences, University of Arizona, Tucson, AZ 85721 USA (e-mail: ppolynkin@optics. arizona.edu). Digital Object Identifier 10.1109/JLT.2005.863337 Fig. 1. Choice of the rectangular and polar coordinate systems. The scanning slit of the beam analyzer is shown with the black vertical stripe in the x−y plane.",

year = "2006",

month = mar,

doi = "10.1109/JLT.2005.863337",

language = "English (US)",

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AU - Yoda, Hidehiko

AU - Polynkin, Pavel

AU - Mansuripur, Masud

N1 - Funding Information: Manuscript received November 17, 2004; revised November 10, 2005. This work was supported by Air Force Office of Scientific Research (AFOSR) under Contract F49620-02-1-03-80. H. Yoda is with The Faculty of Engineering, Utsunomiya University, Utsunomiya 321-8585, Japan. P. Polynkin and M. Mansuripur are with the College of Optical Sciences, University of Arizona, Tucson, AZ 85721 USA (e-mail: ppolynkin@optics. arizona.edu). Digital Object Identifier 10.1109/JLT.2005.863337 Fig. 1. Choice of the rectangular and polar coordinate systems. The scanning slit of the beam analyzer is shown with the black vertical stripe in the x−y plane.

PY - 2006/3

Y1 - 2006/3

N2 - 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 V → ∞. 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 important.

AB - 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 V → ∞. 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 important.

KW - Beam quality factor

KW - Fiber modes

KW - Multimode fiber

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Beam quality factor of higher order modes in a step-index fiber

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Keywords

ASJC Scopus subject areas

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