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We present a single-mode, monolithic holmium-doped silica fibre laser resonantly pumped by thulium-doped fibre lasers through a fused fibre pump combiner. We report the highest achieved output power for a holmium laser of 407 W.
We present results from a mid-IR ZGP ring OPO that demonstrates further power scaling of a cascaded mid-IR laser system. The system achieved 30.2 W of mid-IR output with excellent beam quality of M2 = 1.3.
The quantum efficiency of Nd3+-doped ZBLAN glass under sunlight excitation was measured as more than 70 %, which would be due to the low loss in the VIS-UV region and phonon energy of the glass.
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