高消光比掺Yb^3＋锁模脉冲光纤激光器研究

Study on High Extinction Ratio Ytterbium-doped Mode-locked Fiber Laser

报道了使用976nm半导体激光器作为抽运源,利用非线性放大环形镜(NALM)锁模运行的掺Yb3+光纤激光器的实验研究.采用偏振相关隔离器代替偏振无关光隔离器、保偏光纤耦合器代替普通单模光纤耦合器,得到了高消光比的锁模脉冲输出,重复频率13.46MHz,光谱宽度约2nm,消光比高于25dB.

The experimental study of the Yb^3＋-doped fiber laser using the nonlinear amplified loop mirror （NALM） is reported, which is pumped by 976 nm semiconductor laser. Using polarization dependent isolator and polarization maintaining coupler instead of polarization independent isolator and single mode coupler,high extinction ratio mode-locked pulse train are achieved, the repetition rate is 13.46 MHz, the width of the spectrum is about 2 nm and the extinction ratio is higher than 25 dB.