Zhang M, Hu Guohua, Hu Guoqing, Howe R C T, Chen L, Zheng Z, Hasan T
School of Electronic and Information Engineering, Beihang University, Beijing, 100191, China.
Cambridge Graphene Centre, University of Cambridge, Cambridge, CB3 0FA, UK.
Sci Rep. 2015 Dec 14;5:17482. doi: 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/cm(2) 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.
我们展示了一种镱（Yb）和铒（Er）掺杂的光纤激光器，它由一种经过溶液处理、光学均匀的少层二硫化钨可饱和吸收体（WS2-SA）进行调Q。WS2-SA在亚带隙区域的非线性光学吸收归因于边缘诱导态，在1030和1558 nm处，其调制深度分别为3.1%和4.9%，饱和强度分别为1.38和3.83 MW/cm²。通过将光学均匀的WS2-SA集成到Yb和Er掺杂的激光腔中，我们在1030和1558 nm处获得了持续时间为微秒级、重复频率为千赫兹级的自启动调Q脉冲。我们的工作展示了单个经过溶液处理的WS2-SA的宽带亚带隙可饱和吸收，为WS2在超快光子应用中提供了新的潜在效能。
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