High efficiency diode-pumped continues-wave and passively Q-switched Nd:GSAG laser with a two-dimensional WS2 saturable absorber at 1060 nm

Abstract

Abstract A diode-pumped passively Q-switched Nd:GSAG laser at 1060\u202fnm with a novel two-dimensional tungsten disulfide (WS2) saturable absorber was demonstrated for the first time. In the continuous-wave operation, the maximum output power of 4.68\u202fW was obtained with the output coupler transmission of 10%, at absorbed pump power of 9.95\u202fW. The corresponding slope efficiency benefiting from high doping concentration (3%) of Nd:GSAG was up to 56.9%, which reached the highest value for Nd:GASG laser at 1060\u202fnm, as far as we know. In the passively Q-switched operation, when the absorbed pump power was 3.96\u202fW, pulse width and repetition rate were 1.5\u202fμs and 146.9\u202fkHz, respectively.