Li Guoru, Yang Lingling, Zhao Ruwei, Wang Feifei, Nie Hongkun, Wang Ruihua, Yang Kejian, Zhang Baitao, He Jingliang
Appl Opt. 2020 Dec 20;59(36):11240-11245. doi: 10.1364/AO.412165.
Niobium carbide (), a novel two-dimensional MXene material, has attracted much attention due to its outstanding electronic and optical properties. In this work, a microfiber-based few-layer saturable absorber (SA) is fabricated by the magnetron sputtering deposition technique. The reverse saturable absorption (RSA) response of few-layer nanosheets is observed with I-scan measurements. The square-wave pulses (SWPs) are generated by using the as-prepared microfiber-based few-layer SA in an erbium-doped fiber laser. The SWP width increases from 0.33 to 2.061 ns with the single pulse energy increases linearly up to 0.89 nJ while the amplitude remains as a constant. In addition, nonlinear polarization rotation mode-locking fiber lasers with different cavity lengths are constructed to explore the formation conditions of SWP. Our results indicate that the RSA effect of the few-layer nanosheets plays a decisive role in the formation of the SWP.
碳化铌（）是一种新型的二维MXene材料，因其优异的电学和光学性能而备受关注。在这项工作中，采用磁控溅射沉积技术制备了基于微纤维的少层饱和吸收体（SA）。通过I扫描测量观察到了少层纳米片的反向饱和吸收（RSA）响应。在掺铒光纤激光器中，使用所制备的基于微纤维的少层SA产生了方波脉冲（SWP）。随着单脉冲能量线性增加至0.89 nJ，SWP宽度从0.33 ns增加到2.061 ns，而幅度保持恒定。此外，构建了具有不同腔长的非线性偏振旋转锁模光纤激光器，以探索SWP的形成条件。我们的结果表明，少层纳米片的RSA效应在SWP的形成中起决定性作用。
