Chen Hao, Yin Jinde, Yang Jingwei, Zhang Xuejun, Liu Mengli, Jiang Zike, Wang Jinzhang, Sun Zhipei, Guo Tuan, Liu Wenjun, Yan Peiguang
Opt Lett. 2017 Nov 1;42(21):4279-4282. doi: 10.1364/OL.42.004279.
In this Letter, high-quality WS film and MoS film were vertically stacked on the tip of a single-mode fiber in turns to form heterostructure (WS-MoS-WS)-based saturable absorbers with all-fiber integrated features. Their nonlinear saturable absorption properties were remarkable, such as a large modulation depth (∼16.99%) and a small saturable intensity (6.23 MW·cm). Stable pulses at 1.55 μm with duration as short as 296 fs and average power as high as 25 mW were obtained in an erbium-doped fiber laser system. The results demonstrate that the proposed heterostructures own remarkable nonlinear optical properties and offer a platform for adjusting nonlinear optical properties by stacking different transition-metal dichalcogenides or modifying the thickness of each layer, paving the way for engineering functional ultrafast photonics devices with desirable properties.
在本信函中，高质量的WS薄膜和MoS薄膜依次垂直堆叠在单模光纤尖端，以形成具有全光纤集成特性的基于异质结构（WS-MoS-WS）的可饱和吸收体。它们的非线性饱和吸收特性显著，例如具有较大的调制深度（约16.99%）和较小的饱和强度（6.23 MW·cm）。在掺铒光纤激光系统中获得了中心波长为1.55μm、脉宽短至296 fs且平均功率高达25 mW的稳定脉冲。结果表明，所提出的异质结构具有显著的非线性光学特性，并为通过堆叠不同的过渡金属二卤化物或改变每层厚度来调节非线性光学特性提供了一个平台，为设计具有理想特性的功能性超快光子器件铺平了道路。
