Fig. 1. (a) Experimental setup of the MoS2 Q-switched fiber laser; (b) Raman spectrum of as-grown few-layer MoS2; (c) photograph of a FC coated with few-layer MoS2.

Fig. 2. Nonlinear transmission of few-layer MoS2 SA.

Fig. 3. Oscilloscope traces of the Q-switched pulses under different pump powers Pp; (a) Pp=42  mW; (b) Pp=97  mW; (c) Pp=112  mW; (d) Pp=194  mW.

Fig. 4. Typical characteristics of the Q-switched pulses emitted from the fiber laser at the pump power of 102 mW; (a) output optical spectrum; (b) oscilloscope trace of the Q-switched pulse train; (c) single-pulse profile; (d) RF spectrum.

Fig. 5. (a) Pulse repetition rate and pulse duration versus incident pump power; (b) average output power and single-pulse energy versus incident pump power.

Fig. 6. (a) Laser output spectra at different wavelengths by using different FBGs under a pump power of 102 mW. Inset, axial strain induced wavelength tuning; (b) pulse repetition rate and pulse duration as a function of the wavelength.