掺铒光纤长度差对全光纤激光相干合成的影响

Influence of difference of erbium-doped fiber length on all-fiber coherent beam combining

设计了由两支光纤激光器组成的迈克尔逊型全光纤激光器阵列,通过实验,分析两子光纤激光器的掺铒光纤长度差对激光相干合成稳定性、泵浦效率以及输出功率的影响。结果表明:在未达到增益饱和的情况下,掺铒光纤长度差变化时,全光纤激光器阵列仍得到相干合成输出,但相干度发生变化,即掺铒光纤长度差变大时,相干度变差,总泵浦效率和总输出功率都变小,且变化不是线性的。

The Micelson type all-fiber laser array composed of two fiber lasers was designed. The influenees on the stability of coherent combination, pumping efficiency, and output power were analyzed by experiments as the length difference of Erbium-doped fiber varied. Analysis indicated that the difference of Erbium-doped fiber length didn＇t change the interference characteristics of the coheret light beams, but the interference grade descended as the length difference of Erbium-doped fiber increased. And the total pumping efficiency and total output power descended as the length difference increased,and the relationship between them was non-linear.