间距可控的耗散孤子分子锁模光纤激光器

Dissipative Soliton Molecule Mode-Locked Fiber Laser with Controllable Separation

通过在耗散孤子锁模光纤激光器外接入马赫-曾德尔干涉仪,实现了间隔可控的耗散孤子分子超短脉冲输出。马赫-曾德尔干涉仪由两个50∶50分束器和一个可调谐时间延迟线构成。通过调节时间延迟线控制马赫-曾德尔干涉仪两臂的光程差,可以实现耗散孤子分子的间距连续可调谐。实验中实现了脉冲间隔分别为0.8、1.3、2.37、4.25、6.24、9.4、15.3 ps的耗散孤子分子,对应的光谱调制间隔分别为8.3、6.1、3.83、1.88、1.27、0.85、0.52 nm。理论分析了孤子分子的产生机理并与实验数据保持一致。本研究为实现间距可控孤子分子超短脉冲提供了一个行之有效的方法。

A Mach-Zehnder interferometer is connected outside the dissipative soliton mode-locked fiber laser to realize the ultrashort pulse output of the dissipative soliton molecule with controllable separation.The Mach-Zehnder interferometer is constructed by two 50∶50 optical coupler and a tunable optical time delay line.The separation of the dissipative soliton molecule can be adjusted with the optical path difference of the Mach-Zehnder interferometer,by adjusting the time delay line.The dissipative soliton molecules with the pulse separation of 0.8 ps,1.3 ps,2.37 ps,4.25 ps,6.24 ps,9.4 ps,and 15.3 ps are observed,respectively,the corresponding spectrum separation are 8.3 nm,6.1 nm,3.83 nm,1.88 nm,1.27 nm,0.85 nm,and 0.52 nm.The generation mechanism of the soliton molecule are analyzed theoretically,which agree well with the experimental results.The work provides an effective way to realize dissipative soliton molecule with controllable separation.