Generally speaking, the self-sweeping effect relies on the dynamical grating formed in a gain fiber. Here, the normal self-sweeping was generated in a pump-free ytterbium-doped fiber which serves as a fiber saturable absorber and is introduced to the laser cavity by a circulator in this experiment. The sweeping rate and the sweeping range alter as usual, both of which can be controlled by the pump power. Further, a new self-pulse signal is observed and discussed in this work, which shows the difference of the self-sweeping effects between active fiber and fiber saturable absorber.

中文翻译：

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基于光纤可饱和吸收体的自扫描掺镱光纤激光器

一般而言，自扫频效应依赖于增益光纤中形成的动态光栅。在这里，正常的自扫频是在无泵浦掺镱光纤中产生的，掺镱光纤作为光纤可饱和吸收器，并在本实验中通过循环器引入激光腔。清扫速度和清扫范围照常变化，两者都可以通过泵功率控制。此外，在这项工作中观察和讨论了一个新的自脉冲信号，它显示了有源光纤和光纤可饱和吸收体之间自扫效应的差异。