We report on a 976 nm pumped erbium doped fluoride (Er:ZBLAN) fiber laser emitting at 2.8 m with nearly 70 W of output power in a quasi-continuous wave (Q-CW) regime with the slope efficiency versus launched pump power of ∼20%. It is believed to be the highest Q-CW power ever demonstrated from an Er:ZBLAN fiber laser . We also present the results of a study demonstrating that the Er:ZBLAN fiber laser slope efficiency versus absorbed pump power increases monotonically with the pump wavelength from 19% to 29% over the wavelength range of 960–985 nm. The achieved slope efficiency of 29% is, to the best of our knowledge, the highest efficiency ever reported for an Er:ZBLAN fiber non-cascaded laser.

我们报告了 976 nm 泵浦掺铒氟化物 (Er:ZBLAN) 光纤激光器，发射波长为 2.8 m 在准连续波 (Q-CW) 状态下具有近 70 W 的输出功率，斜率效率与发射泵浦功率的关系约为 20%。它被认为是 Er:ZBLAN 光纤激光器所展示的最高 Q-CW 功率。我们还展示了一项研究结果，证明 Er:ZBLAN 光纤激光器斜率效率与吸收的泵浦功率在 960-985 nm 的波长范围内随着泵浦波长从 19% 到 29% 单调增加。据我们所知，实现的 29% 斜率效率是 Er:ZBLAN 光纤非级联激光器有史以来报告的最高效率。