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提出一种基于反馈光纤环(FFL)的窄线宽单纵模布里渊激光器(BFL),主腔是由光环形器构成的单通谐振腔,长度从传统单纵模BFL的10m扩展并优化至50m,FFL的光纤作为激光器主要增益介质,为了获得单模运行,则将其长度选为传统单纵模BFL的光纤长度10m。通过理论分析,相对于传统的单纵模窄线宽BFL,基于FFL的BFL阈值和线宽都可以得到改善。实验中,与两组不同长度单模光纤进行对比分析,优化了基于FFL的BFL环长,同时将系统置于保温盒中,消除外界对系统的干扰,最终获得的阈值为99mW,边模抑制比提高了45dB,1h内输出功率波动为0.8dB的单纵模布里渊激光,利用延时干涉的方法,测得线宽约为3.23kHz,与理论分析值相符。
A narrow-line single-longitudinal-mode Brillouin laser (BFL) based on a feedback fiber ring (FFL) is proposed. The main cavity is a single resonator consisting of an optical circulator with a length of 10 m from the traditional single longitudinal mode BFL Optimized to 50 m, the FFL fiber serves as the primary gain medium for the laser. To achieve single-mode operation, the length of the fiber is chosen to be 10 m for a conventional single longitudinal mode BFL. Through theoretical analysis, BFL threshold and linewidth based on FFL can be improved compared with the traditional single longitudinal mode narrow linewidth BFL. In the experiment, comparing with two groups of single-mode fiber with different length, the length of BFL based on FFL was optimized and the system was placed in a thermal insulation box to eliminate interference from the outside. The threshold value finally obtained was 99mW, Compared with the single-mode Brillouin laser whose output power is increased by 45dB and the output power fluctuation is 0.8dB within 1h, the linewidth is about 3.23kHz, which is consistent with the theoretical analysis.