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A transmission-type tungsten disulfide(WS_2)-based saturable absorber(SA) is fabricated and applied to passively Q-switched Nd:YVO_4 laser.The WS_2 nanosheets are deposited on a quartz substrate by the vertical evaporation method.By inserting the WS2 SA into the plano-concave laser cavity,we achieve 153-ns pulses with an average output power of1.19 W at 1064 nm.To the best of our knowledge,both of them are the best results among those obtained by the Q-switched solid-state lasers with WS_2-based absorbers.The repetition rate ranges from 1.176 MHz to 1.578 MHz.As far as we know,it is the first time that MHz level Q-switched pulses have been generated in all solid state lasers based on low-dimensional materials so far.
A transmission-type tungsten disulfide (WS_2) -based saturable absorber (SA) is fabricated and applied to passively Q-switched Nd: YVO_4 laser. WS_2 nanosheets are deposited on a quartz substrate by the vertical evaporation method. into the plano-concave laser cavity, we achieve 153-ns pulses with an average output power of 1.19 W at 1064 nm.To the best of our knowledge, both of them are the best results among those obtained by the Q-switched solid -state lasers with WS_2-based absorbers. The repetition rate ranges from 1.176 MHz to 1.578 MHz. As far as we know, it is the first time that MHz level Q-switched pulses have been generated in all solid state lasers based on low- dimensional materials so far.