Abstract
Two-dimensional (2D) materials have been proved to be excellent saturable absorbers. However, the study in Q-switched and mode-locked (QML) lasers has not shown good performances. In this letter, a reflective few-layer molybdenum disulfide saturable absorber (MoS 2 -SA) is fabricated. Using the reflective MoS 2 -SA, a nanosecond passively QML YVO 4 /Nd:YVO 4 /YVO 4 laser is experimentally demonstrated. At the pump power of 11 W, a stable QML laser operation can be achieved, corresponding to a repetition rate of 11 MHz, an envelope pulse width of 72 ns, and a modulation depth of 100%. So far as we know, it is the highest envelope repetition rate and the shortest envelope pulse duration in the reported QML lasers with 2D materials, which prove the MoS 2 -SA has excellent optical properties for ultrafast solid-state laser applications.
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