Q-Switched Dual-Wavelength Laser at 1116 and 1123 nm Using WS2 Saturable Absorber

Longitudinally diode-pumped continuous-wave dual-wavelength Nd:YAG laser at 1116 and 1123 nm is achieved with maximum output power of 8.18 W and slope efficiency of 42.3%. Using WS 2 as saturable absorber, passive Q-switching of the dual-wavelength laser is also achieved with a maximum average output power of 0.41 W, the shortest pulse width of about 0.64 μs at pulse repetition rate of 100.9 kHz. The present Q-switched laser operation leads to maximum pulse energy of 4.06 μJ and pulse peak power of 6.35 W. A 2-D material WS 2 has been experimentally confirmed to be very promising as Q switcher at 1.1 μm, for the first time to our knowledge.