Abstract
The beam quality factor M2 of multimode fiber lasers using coiling technique is studied based on the fiber bend loss theory. M2 is obtained through calculating bend loss and intensity change of different modes in a multimode fiber. The influence of bend-induced field deformation on M2 is evaluated. Relationship of M2 to coiling radius is studied for the multimode fiber lasers. It is shown that M2 keeps almost unchanged in some range of the coiling radius. The performance of mode selection is compared between fibers with the same V-parameter but different NA values. Fibers with smaller NA value are shown to be more effective for mode selection and are more conducive to achieving good beam quality laser output.
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