1 research outputs found
Ultrathin 2D Transition Metal Carbides for Ultrafast Pulsed Fiber Lasers
Two-dimensional
(2D) materials, such as graphene, transition metal
dichalcogenides, and black phosphorus, have attracted intense interest
for applications in ultrafast pulsed laser generation, owing to their
strong light–matter interactions and large optical nonlinearities.
However, due to the mismatch of the bandgap, many of these 2D materials
are not suitable for applications at near-infrared (NIR) waveband.
Here, we report nonlinear optical properties of 2D α-Mo<sub>2</sub>C crystals and the usage of 2D α-Mo<sub>2</sub>C as
a new broadband saturable absorber for pulsed laser generation. It
was found that 2D α-Mo<sub>2</sub>C crystals have excellent
saturable absorption properties in terms of largely tunable modulation
depth and very low saturation intensity. In addition, ultrafast carrier
dynamic results of 2D α-Mo<sub>2</sub>C reveal an ultrashort
intraband carrier recovery time of 0.48 ps at 1.55 μm. By incorporating
2D α-Mo<sub>2</sub>C saturable absorber into either an Er-doped
or Yb-doped fiber laser, we are able to generate ultrashort pulses
with very stable operation at central wavelengths of 1602.6 and 1061.8
nm, respectively. Our experimental results demonstrate that 2D α-Mo<sub>2</sub>C can be a promising broadband nonlinear optical media for
ultrafast optical applications