100-W-level single-mode ytterbium-free erbium fiber laser

We report on an ytterbium-free, erbium-doped single-mode all-fiber laser reaching a record output power of 107 W at 1598 nm, with slope efficiency 38.6% according to the absorbed pump 981 nm. The gain fiber, co-doped cerium, aluminum, and phosphorus, was fabricated in-house adjusted doping concentrations reduce erbium ions clustering, thereby increasing while keeping numerical aperture low ensure operation. addition cerium co-dopant in core glass system is used for first time, best our knowledge, order adjust fiber’s without concentration. Numerical modeling, validated by experimental results, demonstrates that adding aluminum phosphorus high concentration mitigates estimated paired only 5.0% reported fiber.