Results are presented on a 1064 nm upconversion pumped thulium doped fluoride fibre laser operating on the 3F4 – 3H4 transition around 1.47 µm. A minimum threshold of 8.7mW (3.6mW absorbed), and a maximum slope efficiency of 58% (80% photon conversion efficiency), with respect to launched pump power has been observed. In addition a maximum gain efficiency of 0.22 dB/mW has been demonstrated.
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Percival et al. (1994) studied this question.
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