期刊
NANOSCALE
卷 13, 期 4, 页码 2511-2518出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0nr08580d
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资金
- National Natural Science Foundation of China (NSFC) [12075190, 11875044]
- Nature Science Foundation of Shaanxi Province, China [2019JQ-446]
- Young Talent fund of University Association for Science and Technology in Shaanxi, China [20190113]
- Science Research Foundation of the Education Department of Shaanxi Province, China [19JK0811]
- Fundamental Research Funds for the Central Universities, China [xjj2018268]
This study demonstrates the use of WxNb(1-x)Se2 nanosheets as ultrafast photonic devices to generate high power mode-locked and Q-switched pulses in a fiber laser. The results show improvements compared to recent studies, suggesting that 2D TTMDC-based devices could be efficient candidates for ultrafast photonics and nonlinear optical applications.
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 WxNb(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 WxNb(1-x)Se2 nanosheets were successfully prepared by the liquid exfoliation method with thickness less than 3 nm. The nonlinear optical absorption of the WxNb(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 WxNb(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 mu s 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.
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