Abstract
We report on the passive Q-switching laser performance of Yb:LaCa4O(BO3)3 crystal with Cr4+:YAG or two-dimensional (2D) MoS2 acting as a saturable absorber. With Cr4+:YAG, a pulsed output power of 3.8 W was produced at 71 kHz with a slope efficiency of 49%, whereas at a lower repetition rate, the average pulse energy achieved could reach 250 µJ; the shortest duration and peak power were respectively 17 ns and 14.7 kW. For passive Q-switching with 2D MoS2, 1.61 W of pulsed output power was achieved at 395 kHz; the resulting pulse energy, duration, and peak power were 4.1 µJ, 220 ns, and 18.6 W, respectively.
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