A high-power tandem-pumped Ho<sup>3+</sup>, Pr<sup>3+</sup> -doped ZBLAN fiber laser is demonstrated. Using the free-running 1100-nm output from a diode-cladding-pumped Yb<sup>3+</sup> -doped silica fiber laser as the pump source, a maximum output power of 2.5 W was generated at a slope efficiency of 29% after the threshold of ~30 mW was reached. Saturation of the output is avoided with Pr<sup>3+</sup> codoping, which allows single-transition output. The center wavelength of the output was 2.86μm and the bandwidth at maximum power was ~15 nm .
© 2004 Optical Society of America
Stuart D. Jackson, "Single-transverse-mode 2.5-W holmium-doped fluoride fiber laser operating at 2.86 μm," Opt. Lett. 29, 334-336 (2004)