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Beam quality of photonic-crystal fibers

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2 Author(s)
Mafi, A. ; Arizona Center for Math. Sci., Univ. of Arizona, Tucson, AZ, USA ; Moloney, J.V.

In this paper, we investigate the beam quality of photonic-crystal fibers (PCFs) with one, three, and seven missing airholes. The beam quality factor M2 of a PCF is generally larger than unity, even if it is single mode. The results are especially important for the design and measurements of single-mode PCF lasers. A comparison between an M2 measurement of the laser beam and the reported numbers can establish whether a PCF laser is operating as single mode or is contaminated by higher order modes.

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Lightwave Technology, Journal of  (Volume:23 ,  Issue: 7 )