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Rare-earth-doped fiber lasers are emerging as promising high-powermid-infrared sources for the 2.6-3.0 {\mu}m and 3.3-3.8 {\mu}m regions based onerbium and holmium ions. The intermediate wavelength range, however, remainsvastly underserved, despite prospects for important manufacturing and defenseapplications. Here, we demonstrate the potential of dysprosium-doped fiber tosolve this problem, with a simple in-band pumped grating-stabilized linearcavity generating up to 1.06 W at 3.15 {\mu}m. A slope efficiency of 73% withrespect to launched power (77% relative to absorbed power) is achieved: thehighest value for any mid-infrared fiber laser to date, to the best of ourknowledge. Opportunities for further power and efficiency scaling are alsodiscussed.

Watt-level dysprosium fiber laser at 3.15 {\mu}m with 73% slope efficiency