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提出了一种注入式有源双环腔结构光纤激光器。采用双环复合腔结构,通过对主环腔增益控制以及子环腔光注入的方法,获得了单频、窄线宽、无跳模的连续稳定激光输出。实验测得激光器的输出功率达36 d Bm,信噪比为40 d B,频谱线宽为7.1 k Hz,中心波长为1550 nm。数小时运行时间内,激光器的输出功率与波长稳定性较高。该激光器的单频运行取决于主环腔的增益和振荡波长与子环腔内种子激光器的功率和中心波长之间的匹配情况,其中主环腔的增益通过调节抽运光功率、腔内耦合系数进行控制。激光器输出的中心波长可通过改变种子激光器波长进行调谐。利用多模振荡半经典理论模型分析了有源双环腔内实现单频激光输出的物理过程,仿真结果与实验结果一致。该光纤激光器在相干光通信和光纤传感领域将具有广阔的应用前景。
An active dual-cavity fiber laser is proposed. The double-ring composite cavity structure is adopted. Through the control of the main ring cavity gain and the sub-ring cavity light injection method, a continuous and stable laser output with single frequency, narrow linewidth and no hopping mode is obtained. The experimental results show that the output power of the laser reaches 36 d Bm, the signal-to-noise ratio is 40 d B, the spectral linewidth is 7.1 k Hz and the center wavelength is 1550 nm. Within a few hours of operation, the output power and wavelength stability of the laser is high. The single frequency operation of the laser depends on the matching between the gain and oscillation wavelength of the main ring cavity and the power and center wavelength of the seed laser in the sub-ring cavity, wherein the gain of the main ring cavity is adjusted by adjusting the pump light power, Coefficient to control. The center wavelength of the laser output can be tuned by changing the wavelength of the seed laser. The semi-classical model of multi-mode oscillation is used to analyze the physical process of single-frequency laser output in an active double-ring cavity. The simulation results are consistent with the experimental results. The fiber laser will have broad application prospects in the field of coherent optical communication and optical fiber sensing.