Li Lu, Pang Lihui, Wang Yao, Liu Wenjun
School of Science, Xi'an University of Posts and Telecommunications, Xi'an 710121, China.
Shaanxi Provincial Center for Regenerative Medicine and Surgical Engineering, First Affiliated Hospital, Xi'an Jiaotong University, Xi'an 710061, China.
Nanoscale. 2021 Jan 28;13(4):2511-2518. doi: 10.1039/d0nr08580d. Epub 2021 Jan 21.
Ternary transition metal chalcogenides (TTMDCs), a novel type of two-dimensional (2D) three-element materials, possess multiple physical and chemical properties and have promising potentials in basic physics and devices. Herein, the usage of WNbSe nanosheets as a rising ultrafast photonic device to generate high power mode-locked and Q-switched pulses in a fiber laser is demonstrated. The WNbSe nanosheets were successfully prepared by the liquid exfoliation method with thickness less than 3 nm. The nonlinear optical absorption of the WNbSe-based device was investigated with the saturable intensity of 40.93 MW cm and modulation depth of 5.43%. After integrating the WNbSe-based device into an Er-doped fiber (EDF) laser cavity, mode-locking and Q-switching laser pulses were formed. In the mode-locked mechanism output, the pulse width is as narrow as 131 fs and the output power is 52.93 mW. In Q-switched operation, the shortest pulse duration is 1.47 μs with the largest pulse energy of 257 nJ. Compared to recent studies, our results showed some improvements. This study suggests that 2D TTMDC-based devices could be developed as efficient ultrafast photonics candidates and widely used in nonlinear optical applications.
三元过渡金属硫族化合物（TTMDCs）是一类新型的二维（2D）三元材料，具有多种物理和化学性质，在基础物理和器件方面具有广阔的应用潜力。在此，展示了WNbSe纳米片作为一种新兴的超快光子器件，在光纤激光器中产生高功率锁模和调Q脉冲的应用。通过液体剥离法成功制备了厚度小于3nm的WNbSe纳米片。研究了基于WNbSe的器件的非线性光学吸收，其饱和强度为40.93MW/cm，调制深度为5.43%。将基于WNbSe的器件集成到掺铒光纤（EDF）激光腔中后，形成了锁模和调Q激光脉冲。在锁模机制输出中，脉冲宽度窄至131fs，输出功率为52.93mW。在调Q操作中，最短脉冲持续时间为1.47μs，最大脉冲能量为257nJ。与最近的研究相比，我们的结果显示出一些改进。这项研究表明，基于二维TTMDC的器件可以开发成为高效的超快光子学候选材料，并广泛应用于非线性光学应用中。
