Abstract
We report an efficient high-power Yb:YCa4O(BO3)3 laser that was passively Q-switched by a few-layer WS2 saturable absorber. A maximum average output power of 4.05 W was produced at a pulse repetition rate of 606 kHz, with an optical-to-optical efficiency of 40.5% and a slope efficiency of 47%. The resulting pulse energy, duration, and peak power were 6.67 μJ, 66 ns, and 101 W, respectively. Our work demonstrates the great potential of few-layer WS2 and other 2D transition metal dichalcogenides as saturable absorbers for developing high-power, high-repetition-rate, nanosecond, pulsed solid-state lasers.
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