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对二级级联拉曼光纤激光器(RFL)的输出光谱特性进行了研究,利用理论模型讨论了高反腔输出光谱的分裂、对称以及随光栅中心波长改变而形成不对称的现象。实验得到了各级光功率的相互关系:随着抽运功率的增大,产生第一级斯托克斯(Stokes)波,剩余抽运功率有一个衰减的阶段;抽运功率继续增大,第二级斯托克斯波产生后,第一级斯托克斯波功率达到饱和,剩余抽运功率又开始线性增长。利用功率沿光纤长度分布的模型,分析了二级级联拉曼光纤激光器的功率特性,理论模型与实验结果相吻合。
The output spectral characteristics of two-stage cascaded Raman fiber lasers (RFLs) were studied. The theoretical model was used to discuss the splitting and symmetry of the output spectrum of the high back-cavity, as well as the asymmetric phenomenon with the change of the central wavelength of the grating. The correlation of optical power at different levels was obtained experimentally. With the increase of pumping power, the first order Stokes wave was generated and the remaining pumping power had a decaying phase. The pumping power continued to increase, After the second Stokes wave is generated, the first Stokes’ wave reaches saturation, and the remaining pumping power begins to grow linearly again. The power characteristics of two-stage cascaded Raman fiber lasers are analyzed by using the model of power distribution along the fiber length. The theoretical model is in good agreement with the experimental results.