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

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122 Scopus citations


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 languageEnglish (US)
Pages (from-to)1350-1355
Number of pages6
JournalJournal of Lightwave Technology
Issue number3
StatePublished - Mar 2006


  • Beam quality factor
  • Fiber modes
  • Multimode fiber

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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