Directly diode-pumped holmium fiber lasers.

@article{Jackson2007DirectlyDH,
  title={Directly diode-pumped holmium fiber lasers.},
  author={Stuart D. Jackson and Frank Bugge and Goetz Erbert},
  journal={Optics letters},
  year={2007},
  volume={32 17},
  pages={2496-8}
}
Sensitizer-free holmium-doped silica and fluoride mid-infrared fiber lasers are pumped using a high-power diode laser operating at 1148 nm. A maximum output power of 162 mW at 2.86 microm was produced at a slope efficiency of 24% using Ho(3+), Pr(3+)-doped fluoride fiber. Using Ho(3+)-doped silica fiber, a maximum output power of 55 mW at 2.1 microm was generated at a slope efficiency of 27%, a value limited by the presence of pump excited state absorption. 
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