Black Phosphorus Q-Switched Large-Mode-Area Tm-Doped Fiber Laser

Figure 1

(a) Raman spectrum of the BP flake sample. (b) Morphology of BP flake measured by the scanning electron microscopy (SEM). (c) Three-dimension morphology of the BP flake scanned by the atomic force microscopy (AFM). Inset: height difference between mica sheet substrate (point A) and BP flake (point B). (d) Elemental components measured by the energy-dispersive X-ray spectroscopy (EDS). Inset: SEM image of BP flake.

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