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Opt Express. 2019 May 13;27(10):14283-14297. doi: 10.1364/OE.27.014283.

Effects of ion clustering and excited state absorption on the performance of Ho-doped fiber lasers.

Abstract

The effects of ion clustering and excited state absorption occurring in holmium-doped fiber lasers are investigated experimentally and theoretically. It is found that the slope efficiencies of holmium-doped fiber lasers are reduced by inhomogeneous upconversion associated with the clustering of Ho3+ ions. Via theoretical analysis based upon Judd-Ofelt theory, it is also found that the effect of excited state absorption on the performance of Ho-doped fiber lasers is negligible, a fact indicating that ion clustering is the dominant cause of the lower-than-expected slope efficiencies observed in holmium-doped fiber lasers. We argue that ion clustering is an intrinsic flaw of holmium-doped fibers and is difficult to eliminate, because our research efforts are based on commercially available low-concentration fiber, which is fabricated with state-of-the-art techniques.

PMID:
31163879
DOI:
10.1364/OE.27.014283

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