High peak power sub-nanosecond pulsed Nd:Lu sub(0.15) Y sub(0.85) VO sub(4) laser with WS sub(2) saturable absorber and EO modulator

A few-layer WS sub(2) nanosheet was prepared by the ultrasonic assisted vertical evaporation method and its corresponding characteristics were measured. By simultaneously employing the WS sub(2) nanosheet and electro-optic modulator (EOM) as modulator, a dual-loss-modulation Q-switched and mode-locked (QML) Nd:Lu sub(0.15) Y sub(0.85) VO sub(4) sub-nanosecond laser with controllable repetition rate and high peak power was presented. The output performances versus the pump power were measured. At the pump power of 8.92 W, the shortest pulse duration was measured to be about 467 ps, corresponding to a peak power of 731 kW. To our knowledge, this is the highest output peak power with WS sub(2) saturable absorbers (SAs) reported.