Cheng Ping Kwong, Liu Shunxiang, Ahmed Safayet, Qu Junle, Qiao Junpeng, Wen Qiao, Tsang Yuen Hong
Department of Applied Physics and Materials Research Center, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China.
Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
Nanomaterials (Basel). 2020 Dec 6;10(12):2441. doi: 10.3390/nano10122441.
Two-dimensional (2D) transition metal dichalcogenide (TMD) materials have exceptional optoelectronic and structural properties, which allow them to be utilized in several significant applications in energy, catalyst, and high-performance optoelectronic devices. Among other properties, the nonlinear optical properties are gaining much attention in the research field. In this work, a unique pentagonal TMD material, palladium disulfide (PdS), is employed as a saturable absorber (SA) in an ytterbium-doped fiber (YDF) laser cavity and mode-locked laser pulse is generated. At first, liquid phase exfoliation is performed to prepare PdS nanoflakes. Afterward, the PdS-nanoflakes solution was incorporated in the side-polished fiber (SPF) to form SPF-based PdS-SA. By utilizing this SA, a highly stable mode-locked laser pulse is realized at pump power of 160 mW, which has a center wavelength of 1033 nm and a 3-dB spectral bandwidth of 3.7 nm. Moreover, the pulse duration, maximum power output and corresponding single-pulse energy were determined as 375 ps, 15.7 mW and 0.64 nJ, respectively. During the experiment, the mode-locked pulse remained stable till the pump power reached a value of 400 mW and, for the regulation of power, the slope efficiency is calculated at about 4.99%. These results indicate that PdS material is a promising nonlinear optical material for ultrafast optical applications in the near-infrared (NIR) region.
二维（2D）过渡金属二硫属化物（TMD）材料具有优异的光电和结构特性，这使其能够应用于能源、催化剂及高性能光电器件等多个重要领域。在其诸多特性中，非线性光学特性在研究领域正备受关注。在这项工作中，一种独特的五角形TMD材料二硫化钯（PdS）被用作掺镱光纤（YDF）激光腔中的可饱和吸收体（SA），并产生了锁模激光脉冲。首先，通过液相剥离法制备PdS纳米片。随后，将PdS纳米片溶液掺入侧面抛光光纤（SPF）中，形成基于SPF的PdS-SA。利用这种SA，在160 mW的泵浦功率下实现了高度稳定的锁模激光脉冲，其中心波长为1033 nm，3 dB光谱带宽为3.7 nm。此外，脉冲持续时间、最大功率输出和相应的单脉冲能量分别确定为375 ps、15.7 mW和0.64 nJ。在实验过程中，锁模脉冲在泵浦功率达到400 mW之前一直保持稳定，并且在功率调节方面，计算得出斜率效率约为4.99%。这些结果表明，PdS材料是一种在近红外（NIR）区域超快光学应用中很有前景的非线性光学材料。
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