Abstract A two-dimensional WS2 grown by chemical vapor deposition (CVD) is employed as saturable absorber. Using a novel crystal of Tm:Ca(Gd,Lu)AlO4, doubly Q-switched laser with acousto-optic modulator (AOM) and WS2 saturable absorber is presented. The shortest pulse width of 91 ns corresponding to a highest peak power of 1.2 kW is obtained when the modulation rate (MR) of AOM is 1 kHz. In comparison to the singly Q-switched lasers with WS2 or AOM, the maximum pulse width compression ratio is 15.38 and the highest peak power enhancement factor is 511.30. The experiment results show a promising saturable absorption of WS2 and that the doubly Q-switched laser is beneficial for compressing the pulse width and improving the peak power.

中文翻译：

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脉冲 Tm:Ca(Gd,Lu)AlO4 激光通过声光调制器和 CVD 生长的二硫化钨 (WS2) 双调 Q

摘要 采用化学气相沉积 (CVD) 法生长的二维 WS2 作为可饱和吸收体。使用新型 Tm:Ca(Gd,Lu)AlO4 晶体，提出了具有声光调制器 (AOM) 和 WS2 可饱和吸收器的双 Q 开关激光器。当 AOM 的调制速率 (MR) 为 1 kHz 时，最短脉冲宽度为 91 ns，对应于 1.2 kW 的最高峰值功率。与WS2或AOM的单调Q激光器相比，最大脉宽压缩比为15.38，最高峰值功率增强因子为511.30。实验结果表明WS2具有良好的可饱和吸收性，双调Q激光器有利于压缩脉冲宽度和提高峰值功率。