The characteristics of a Tm3+ doped fibre laser pumped by a laser diode are reported. Operating at a wavelength of 1.94 μm, the laser had a threshold of 4.4 mW, a launched power slope efficiency of 17% and 1 mW output power. Measurements on the tuning range of Tm3+ are presented and lasing is found to be possible from 1.65–2.0 μm, the specific range depending on the fibre type. The largest range for a single laser was 300 nm.
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Barnes et al. (1990) studied this question.
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