We describe erbium-ytterbium co-doped fiber lasers in different free-running and tunable configurations. The lasers were cladding-pumped by high-power multimode diode sources. We compare pumping at 915 and 980 nm. With a free-running laser, we obtained slope efficiencies of up to 50% with 915-nm pumping and 38% with 980-nm pumping, with respect to absorbed pump power. We reached a double-ended output power of 16.8 W from the free-running laser. Thanks to a high rare-earth concentration and a small inner cladding area (possible with the high-brightness pump sources we used), the operating pump absorption of the fiber reached 8 dB/m. With such high absorption, short fibers with high nonlinear thresholds are possible even with cladding pumping. The tunable fiber laser had a tuning range from 1533 to 1600 nm and emitted 6.7 W of output power at 1550nm in a high-brightness, single-polarization, narrow linewidth beam.
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机译：我们描述了在不同的自由运行和可调配置中掺入-fiber的光纤激光器。激光器由高功率多模二极管源进行熔覆泵浦。我们比较了915和980 nm的泵浦。使用自由运行的激光器，就吸收的泵浦功率而言，我们在915nm泵浦下获得高达50％的斜率效率，在980nm泵浦下获得38％的斜率效率。自由运行的激光器达到了16.8 W的双端输出功率。由于稀土元素浓度高和内部包层面积小（我们使用的高亮度泵浦光源可能实现），因此光纤的工作泵浦吸收率达到8 dB / m。由于具有如此高的吸收率，即使包层抽运，具有高非线性阈值的短光纤也是可能的。可调光纤激光器的调谐范围为1533至1600 nm，并在高亮度，单偏振，窄线宽光束中在1550nm处发射6.7 W输出功率。
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