Tuning of the 2.1 µm Ho3+-doped silica fibre laser is demonstrated for the first time. The 5I7→5I8 transition provides tuning over 144 nm, from 2019 to 2163 nm, and a maximum pump-limited output power of 1.58 W at 2100 nm was produced.
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Jackson et al. (2004) studied this question.
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