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We demonstrate a ytterbium (Yb) and an erbium (Er)-doped fiber laserQ-switched by a solution processed, optically uniform, few-layer tungstendisulfide saturable absorber (WS2-SA). Nonlinear optical absorption of theWS2-SA in the sub-bandgap region, attributed to the edge-induced states, ischaracterized by 3.1% and 4.9% modulation depths with 1.38 and 3.83 MW/cm2saturation intensities at 1030 and 1558 nm, respectively. By integrating theoptically uniform WS2-SA in the Yb- and Er-doped laser cavities, we obtainself-starting Q-switched pulses with microsecond duration and kilohertzrepetition rates at 1030 and 1558 nm. Our work demonstrates broadbandsub-bandgap saturable absorption of a single, solution processed WS2-SA,providing new potential efficacy for WS2 in ultrafast photonic applications.

Yb- and Er-doped fiber laser Q-switched with an optically uniform, broadband WS2 saturable absorber