Black phosphorus Q-switched and mode-locked mid-infrared Er:ZBLAN fiber laser at 3.5 μm wavelength.

  title={Black phosphorus Q-switched and mode-locked mid-infrared Er:ZBLAN fiber laser at 3.5 $\mu$m wavelength.},
  author={Zhipeng Qin and Ting Hai and Guoqiang Xie and Jingui Ma and Peng Yuan and Liejia Qian and Lei Li and Luming Zhao and Deyuan Shen},
  journal={Optics express},
  volume={26 7},
With the proposal of dual-wavelength pumping (DWP) scheme, DWP Er:ZBLAN fiber lasers at 3.5 μm have become a fascinating area of research. However, limited by the absence of suitable saturable absorber, passively Q-switched and mode-locked fiber lasers have not been realized in this spectral region. Based on the layer-dependent bandgap and excellent photoelectric characteristics of black phosphorus (BP), BP is a promising candidate for saturable absorber near 3.5 μm. Here, we fabricated a 3.5… 

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