高效率纤芯同带抽运铒镱共掺光纤放大器

High Efficiency Inband Core-Pumped Erbium/Ytterbium-Codoped Fiber Amplifier

搭建了输出1535nm激光的铒镱共掺光纤放大器,通过注入1064nm信号光以抑制Yb离子波段处的放大自发辐射光,放大后的1535nm最大功率为3.2W。然后利用1535nm激光进行了1570nm种子光纤芯同带抽运铒镱共掺光纤放大实验,研究了在不同功率的抽运光时放大器的输出功率和光谱。当种子光功率为80mW,铒镱共掺光纤长度为5m,1535nm抽运光为2.1W时,放大器最大输出功率为1.22W,斜率效率为58.4%。同时进行了常规的976nm包层抽运1570nm种子光的对比实验。基于同一种子光和相同长度的增益光纤,常规抽运方式的斜率效率为23.7%。实验结果证明了同带抽运方式具有更高的转换效率。

A cladding-pumped single-mode Er-Yb-codoped fiber amplifier which is seeded by two lasers at 1535 nm and 1064 nm is designed to suppress the harmful Yb emission. An inband core-pumped fiber amplifier is constructed with the 1535 nm laser. The output power and spectrum of the amplifier are measured with different launched pump power. A 1.22 W maximum output power with 58.4 % slope efficiency is achieved when the gain fiber is 5 m long, the seed laser power is 80 roW, and the 1535 nm pump power is 2. 1 W. The output power and efficiency of a traditional amplifier whose pump source is 976 nm laser diode are also measured. The experimental results indicate that inband-pumped fiber amplifier can achieve higher efficiency than traditional fiber amplifiers.