1550nm高功率窄线宽光纤放大器实验研究

研制了1550nm高功率窄线宽光纤放大器。实验中以单频窄线宽半导体激光器为信号源，15m长Er^3＋／Yb3＋共掺双包层光纤为增益介质，抽运源采用两支980nm波长大功率激光二极管，抽运阈值功率约0．6W，在抽运功率为10W时，得到放大输出功率为1．1W，光-光转换效率为11％，斜率效率为11．7％，增益大于20dB。采用延迟自外差法测量了种子激光放大前后的线宽，测量得到线宽均为220kHz。信号激光通过光纤放大器后对其窄线宽特性没有影响。

Experimental study on 1550nm high efficient narrow line width fiber amplifier

A 1550nm high efficient narrow line width fiber amplifier was demonstrated.In the experiment,a single frequency narrow line width semiconductor laser was used as signal source,and a section of 15m Er3+/Yb3+ co-doped double-clad fiber pumped by two high power 980nm LD was used as gain medium.The fiber laser exhibited a threshold of 0.6 W,the output power of 1.1W was obtained upon the maximmn 10W pump power.The conversion efficiency and slope efficiency reached 11% and 11.7% respectively,and a gain of more th...