Pulse characteristics from a MoSe2 Q-switched Nd:GdVO4 laser at 1.3 μm

Few-layered MoSe2 nanosheets were prepared by the low-cost, simple liquid-phase exfoliation method. The MoSe2 nanosheets possessed the modulation depth of 16.5% with a saturation intensity of 0.84 MW/cm(2) at 1.34 mu m, indicating the performance as the saturable absorber. The passively Q-switched c-cut Nd : GdVO4 laser at 1.34 mu m was demonstrated with the few-layered MoSe2 saturable absorber for the first time. The minimum pulse duration of 420 ns at a repetition rate of 238 kHz could be obtained. In order to significantly reduce the pulse duration, dual-loss modulation simultaneously using both V3+ : YAG and MoSe2 saturable absorbers was implemented. The pulse duration was compressed to a 82.4 ns pulse at a repetition rate of 409.3 kHz at the pump power of 10.66 W. The experimental results provide a solid fundament for the short pulse generation with MoSe2 saturable absorber at 1.34 mu m. (C) 2019 Optical Society of America.