Measuring beam quality of hollow core photonic crystal fibers

Jonathan D. Shephard, Peter J. Roberts, J. D C Jones, Jonathan C. Knight, Duncan P. Hand

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


In this paper, the authors measure the quality of the delivered beam from hollow core photonic crystal fibers (HC-PCFs). The M2 parameter is determined, and the near- to far-field transition is examined. The influence on these properties due to the presence of a core surround mode is evaluated. The applicability of the International Standards Organization 11146:1999 standard for M2 measurement of the beam quality of HC-PCFs is discussed. Because they are dependent on the measurement parameters, such as choice of aperturing scheme and the axis of measurement, M2 values could vary from 1.32 to 3.17 for the same output beam. This highlights the need for careful consideration when measuring and describing the beam quality delivered by these novel photonic fibers. © 2006 IEEE.

Original languageEnglish
Pages (from-to)3761-3769
Number of pages9
JournalJournal of Lightwave Technology
Issue number10
Publication statusPublished - Oct 2006


  • Beam quality
  • Hollow core (HC)
  • Photonic crystal fibers (PCFs)


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