Li Huanhuan, Hu Fangming, Li Can, Tian Ying, Huang Changqing, Zhang Junjie, Xu Shiqing
Opt Lett. 2019 May 15;44(10):2442-2445. doi: 10.1364/OL.44.002442.
We demonstrated an all-fiber multiwavelength mode-locking thulium-doped fiber laser employing a cascaded single-mode step-index multimode-graded-index multimode single-mode-fiber (SMF-SIMF-GIMF-SMF) saturable absorber (SA). Based on the linear and nonlinear multimode interference effect of the proposed device, this structure can act both as a filter and as a SA. A stable triwavelength (1857/1897/1934 nm) mode-locking operation with the adjacent wavelength interval of approximately 40 nm was obtained. The triwavelength mode locking can also be quickly switched either pair-by-pair or one-by-one by adjusting the polarization controller properly. Our results indicate that the SMF-SIMF-GIMF-SMF structure provides a simpler and more compact solution for switchable multiwavelength mode locking in fiber lasers.
我们展示了一种全光纤多波长锁模掺铥光纤激光器，它采用了一种级联的单模阶跃折射率 - 多模渐变折射率 - 多模单模光纤（SMF - SIMF - GIMF - SMF）饱和吸收体（SA）。基于所提出器件的线性和非线性多模干涉效应，这种结构既可以充当滤波器，也可以充当饱和吸收体。获得了稳定的三波长（1857/1897/1934纳米）锁模运转，相邻波长间隔约为40纳米。通过适当调整偏振控制器，三波长锁模还可以逐对或逐个快速切换。我们的结果表明，SMF - SIMF - GIMF - SMF结构为光纤激光器中可切换的多波长锁模提供了一种更简单、更紧凑的解决方案。
