光子晶体光纤放大器增益特性的实验研究

 采用掺Yb³⁺双包层光子晶体光纤作为放大器的增益介质，在双端泵浦方式下，理论并实验研究了不同信号光时放大器的增益特性。在双端泵浦方式下，泵浦总功率为150.2 W、信号光功率为6 W时，获得了72 W的功率输出,斜率效率达到了60%。实验发现当泵浦总功率超过一定值时，由光纤端面反射形成的振荡腔引起放大器寄生振荡，并由于各种非线性效应出现了自脉动现象，影响了输出功率的进一步提高。

Experimental study of gain characteristics of high power photonic crystal fiber amplifier

The gain characterization of photonic crystal fiber amplifier is theoretically and experimentally studied by using double-side pumped technique.The gain curves for different pumping power and different signal lights are obtained experimentally.When the power of the probe light is 6 W and the total pump power is 150.2 W,the output power,up to 72 W and the slope efficiency 60%,have been achieved eventually with double-side pumped.It is found in the experiment that when the total pump power is increased over a certain value,the parasitic oscillation and the self-pulsation are observed in the amplifier,because of the resonant cavity caused by the surface reflection of fiber and nonlinear effect,and in turn this degrades the system performance.