A high-power red fibre laser with a Pr-doped waterproof fluoro-aluminate glass fibre (Pr:WPFGF) is reported. Even though a Pr:WPFGF is a fluoride material, it possesses low deliquescence and enough long-term stability. A blue/violet GaN laser diode at 442 nm was launched into the Pr:WPFGF (core diameter 8 µm, length 40 mm), both end surfaces of which were directly coated to construct a resonator. The maximum output power was measured to be 311.4 mW at 800 mW pumping power. The oscillation wavelength was 638 nm and the slope efficiency was calculated to be 41.6%. These results showed good agreement with theoretical predictions.
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Nakanishi et al. (2010) studied this question.
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