在环形腔掺镱光纤激光器中加入一段G.652光纤作为多模光纤,依靠其中导模的空间模式跳变构成动态梳状滤波器,于室温下实现了掺镱光纤激光器1.03 μm波长附近稳定的6波长激光同时输出。激光线宽为0.15 nm,边模抑制比达到40 dB以上。通过调整腔内的偏振控制器,可以得到不同波长个数和波长间隔的多波长激光输出。

A section of G. 652 fiber was spliced into the Yb-doped ring fiber laser as multimode fiber for lasing light. This combination of fiber types acts as a wavelength-dependent dynamical comb-like filter in the laser through spatial mode beating. Up to six stable laser wavelengths can be obtained in the region of 1030 nm with spectrum linewidth of 0. 15 nm and SMSR of 40 dB. By adjusting the polarization state of the light, the number of lasing wavelength and its space can be controlled.