采用不同中心谱线、不同谱线宽度的选频元件进行实验, 研究选频元件谱线特性对相干合成效率的影响。实验表明：选频元件中心谱线越接近, 相干合成效率越高；与此同时, 选频元件的谱线宽度越宽, 线形越接近重合, 相干合成效率也越高, 接近理想值100%。在此基础上, 利用中心谱线一致的宽谱选频元件, 实现两路掺Er光纤激光器的相干合成, 输出功率为375 mW, 相干合成效率高达99.3%。

The paper studies the influence of frequency components on coherent combining efficiency by using frequency components with different central spectral lines and spectral widths. Experiment results show that closer central spectral lines lead to higher coherent combining efficiency; the coherent combining efficiency is higher when the spectral width is wider and the spectral shapes are similar, which can be close to the ideal value of 100%. The coherent combination of two Er-doped fiber lasers by using frequency components with the same central spectral line and width is achieved, of which the output power is 375 mW, and the coherent combining efficiency is as high as 99.3%.