Yb- and Er-doped fiber laser Q-switched with an optically uniform, broadband WS2 saturable absorber
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Zhang, M., Hu, G., Hu, G., Howe, R., Chen, L., Zheng, Z., & Hasan, T. (2015). Yb- and Er-doped fiber laser Q-switched with an optically uniform, broadband WS2 saturable absorber. Scientific Reports, 5 (17482)https://doi.org/10.1038/srep17482
We demonstrate a ytterbium (Yb) and an erbium (Er)-doped fiber laser Q-switched by a solution processed, optically uniform, few-layer tungsten disulfide saturable absorber (WS₂-SA). Nonlinear optical absorption of the WS₂-SA in the sub-bandgap region, attributed to the edge-induced states, is characterized by 3.1% and 4.9% modulation depths with 1.38 and 3.83 MW/cm² saturation intensities at 1030 and 1558 nm, respectively. By integrating the optically uniform WS₂-SA in the Yb- and Er-doped laser cavities, we obtain self-starting Q-switched pulses with microsecond duration and kilohertz repetition rates at 1030 and 1558 nm. Our work demonstrates broadband sub-bandgap saturable absorption of a single, solution processed WS₂-SA, providing new potential efficacy for WS₂ in ultrafast photonic applications.
The authors thank E. J. R. Kelleher for valuable discussions. MZ acknowledges support from Beihang University, China, through a Zhuoyue Bairen Program and TH from the Royal Academy of Engineering through a fellowship (Graphlex). This work at Beihang University was supported by 973 Program (2012CB315601), NSFC (61221061/61435002) and the Fundamental Research Funds for the Central Universities.
External DOI: https://doi.org/10.1038/srep17482
This record's URL: https://www.repository.cam.ac.uk/handle/1810/252561
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