Wu Tsai-wei, Chang Wei-zung, Galvanauskas Almantas, Winful Herbert G
Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan 48109, USA.
Opt Express. 2010 Dec 6;18(25):25873-86. doi: 10.1364/OE.18.025873.
We generalize the recently proposed model for coherent beam combining in passive fiber laser arrays [Opt. Express 17, 19509 (2009)] to include the transient gain dynamics and the complication of counterpropagating waves, two important features characterizing actual experimental conditions. The extended model reveals that beam combining is not affected by the population relaxation process or the presence of backward propagating waves, which only serve to co-saturate the gain. The presence of nonresonant nonlinearity is found to reduce the coherent combining efficiency at high power levels. We show that the array lases at the frequencies with minimum overall losses when multiple loss mechanisms are present.
我们将最近提出的用于无源光纤激光器阵列中相干光束合成的模型[《光学快报》17, 19509 (2009)]进行推广，以纳入瞬态增益动力学以及反向传播波的复杂性，这两个重要特征表征了实际实验条件。扩展后的模型表明，光束合成不受粒子数弛豫过程或反向传播波的存在的影响，后者仅起到共同使增益饱和的作用。发现在高功率水平下，非共振非线性的存在会降低相干合成效率。我们表明，当存在多种损耗机制时，阵列在具有最小总损耗的频率处产生激光。
