Abstract By applying a prepared 3 nm-thick tungsten diselenide (WSe2) saturable absorber to an electro-optic (EO) modulated fundamental-light laser, an active and passive Q-switched intra-cavity optical parametric oscillator (IOPO) has been experimentally realized. Benefiting from the saturable absorption property of WSe2, the output characteristics of Q-switched IOPO with signal-light oscillating are obviously improved, including the 93.7%-increased peak power, 54.6%-compressed pulse width, 30.1%-improved conversion efficiency, 60.1%-improved pulse-train stability, 17.8%-improved beam quality, and 27.4%-shortened linewidth. With the values of absorption parameters calculated from the measured nonlinear-transmittance curve of WSe2, the rate equations for dual-loss Q-switched IOPO with WSe2 saturable absorber and electro-optic modulator are numerically solved. The theoretical values correspond to the experimental data well.

中文翻译：

---

基于EO调制器和分层WSe2 SA的有源-无源调Q腔内光参量振荡器的实验优化和动力学求解

摘要 通过将制备的 3 nm 厚二硒化钨 (WSe2) 可饱和吸收体应用于电光 (EO) 调制基光激光器，实验实现了有源和无源调 Q 腔内光学参量振荡器 (IOPO)。 . 受益于WSe2的饱和吸收特性，信号光振荡调QIOPO的输出特性得到明显改善，包括峰值功率提高93.7%，脉冲宽度压缩54.6%，转换效率提高30.1%，60.1 % 提高了脉冲序列稳定性，提高了 17.8% 的光束质量，缩短了 27.4% 的线宽。由测得的 WSe2 非线性透射曲线计算出的吸收参数值，数值求解了具有WSe2可饱和吸收器和电光调制器的双损耗调QIOPO的速率方程。理论值与实验数据很好地对应。