期刊
NANOPHOTONICS
卷 9, 期 8, 页码 2341-2349出版社
WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2019-0350
关键词
fiber laser; Q-switched; mode-locked
资金
- National Key R&D Program of China [2018YFB1107200]
- Open Research Fund of State Key Laboratory of Pulsed Laser Technology
- National Natural Science Foundation of China [61675158, 21673058]
- Singapore National Research Foundation [NRF-RF2013-08]
- A*Star QTE program
- [MOE2015-T2-2-007]
- [MOE2015T2-2-043]
- [MOE2017-T2-2-136]
In this article, a high-quality saturable absorber (SA) based on a two-dimensional ternary chalcogenide Ta2NiS5 nanosheet has been successfully fabricated and used in 1- and 1.5-mu m spectral regions to generate ultrafast laser pulses. The Ta2NiS5-based SA is fabricated by mechanical exfoliation and sandwiched between two fiber ferrules to form a fiber-compatible SA. On the basis of the twin-detector technique, nonlinear optical absorption of the Ta2NiS5-SA is characterized by 64.7% and 11.95% modulation depths with 1.3 and 0.72 MW/cm(2) saturation intensities at 1028 and 1570 nm, respectively. When Ta2NiS5-SA is integrated into Yb- and Er-doped fiber laser cavities, stable self-starting Q-switched pulses are observed. Furthermore, by adjusting the cavity structure and optimizing dispersion in the cavity, we obtain hybrid mode-locking and mode-locking fiber laser operation at 1029 and 1569 nm, respectively. These results validate the performance of Ta2NiS5 as a broadband SA for the generation of ultrafast laser pulses, offering new opportunities of ternary transition-metal dichalcogenide alloys in future photonic devices.
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