Chemical vapor deposition synthesized monolayer MoS2 for Q switching pulse generation in the 2 m spectral region

We demonstrate a monolayer MoS2 based saturable absorber SA synthesized by chemical vapor deposition CVD . The as grown SA has high spatial homogeneity and shows excellent saturable absorption properties in the 2 m wavelength region. A higher modulation depth of 21.3 and lower saturation intensity of 0.47 MW cm2 are achieved compared with those of other documented MoS2 SAs to date. When applying the MoS2 SA to a Tm YAG ceramic laser, we observe a Q switched pulse train with a shortest pulse duration of 388.0 amp; 8197;ns under a pulse repetition rate of 82 kHz, which corresponds to a single pulse energy of 5.4 uJ and a peak power of 14 W. We believe that CVD constitutes an effective method towards high quality MoS2 saturable absorbers that possess remarkable application potential in the 2 m wavelength regio