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 W_xNb_(1−x)Se₂ nanosheets as a rising ultrafast photonic device to generate high power mode-locked and Q-switched pulses in a fiber laser is demonstrated. The W_xNb_(1−x)Se₂ nanosheets were successfully prepared by the liquid exfoliation method with thickness less than 3 nm. The nonlinear optical absorption of the W_xNb_(1−x)Se₂-based device was investigated with the saturable intensity of 40.93 MW cm⁻² and modulation depth of 5.43%. After integrating the W_xNb_(1−x)Se₂-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.

中文翻译：

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WxNb（1-x）Se2纳米片用于超快光子学

三元过渡金属硫属元素化物（TTMDC）是一种新型的二维（2D）三元素材料，具有多种物理和化学特性，在基础物理学和设备中具有广阔的发展潜力。本文中，展示了使用W _x Nb _{（1- x）} Se ₂纳米片作为上升的超快光子器件，以在光纤激光器中产生高功率锁模和Q开关脉冲的情况。通过液体剥离法成功地制备了厚度小于3nm的W _x Nb _{（1- x）} Se ₂纳米片。W _x Nb _{（1- x）}的非线性光学吸收研究了基于Se ₂的器件，其饱和强度为40.93 MW cm ^-2，调制深度为5.43％。积分W _x Nb _{（1- x）} Se _2之后在基于掺device光纤（EDF）的激光腔中，形成了锁模和调Q激光脉冲。在锁模机构输出中，脉冲宽度窄至131 fs，输出功率为52.93 mW。在Q开关操作中，最短脉冲持续时间为1.47μs，最大脉冲能量为257 nJ。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的设备可以开发为高效的超快光子学候选者，并广泛用于非线性光学应用中。