WS2 mode-locked ultrafast fiber laser.
WS2 mode-locked ultrafast fiber laser.
复制标题
WS2锁模超快光纤激光器
DOI：
10.1038/srep07965
复制
发表时间：
2015-01-22
影响因子：
4.6
通讯作者：
Zhao J
中科院分区：
文献类型：
--
作者：
Mao D;Wang Y;Ma C;Han L;Jiang B;Gan X;Hua S;Zhang W;Mei T;Zhao J
石墨烯类二维材料，如WS2和MoS2，是一种高度各向异性的层状化合物，从基础研究到实际应用都引起了人们越来越多的兴趣。与MoS2类似，少层WS2具有显著的物理性能。在这里，我们首次证明了WS2纳米片具有超快非线性可饱和吸收特性和高的光学损伤阈值。在掺铒光纤激光器中，采用两种WS2基可饱和吸收体分别实现了孤子锁模，其中一种是在D型光纤上沉积WS2纳米片，另一种是将WS2溶液与聚乙烯醇混合，然后在衬底上蒸发合成。在最大抽运功率为600 mW时，两个可饱和吸收体均能稳定工作在锁模状态，且无损伤，表明少层WS2是一种很有前途的高功率柔性可饱和吸收体。许多应用可能受益于WS 2纳米片的超快非线性特征，例如高功率脉冲激光、材料加工和频率梳光谱学。
Graphene-like two dimensional materials, such as WS2 and MoS2, are highly anisotropic layered compounds that have attracted growing interest from basic research to practical applications. Similar with MoS2, few-layer WS2 has remarkable physical properties. Here, we demonstrate for the first time that WS2 nanosheets exhibit ultrafast nonlinear saturable absorption property and high optical damage threshold. Soliton mode-locking operations are achieved separately in an erbium-doped fiber laser using two types of WS2-based saturable absorbers, one of which is fabricated by depositing WS2 nanosheets on a D-shaped fiber, while the other is synthesized by mixing WS2 solution with polyvinyl alcohol, and then evaporating them on a substrate. At the maximum pump power of 600 mW, two saturable absorbers can work stably at mode-locking state without damage, indicating that few-layer WS2 is a promising high-power flexible saturable absorber for ultrafast optics. Numerous applications may benefit from the ultrafast nonlinear features of WS2 nanosheets, such as high-power pulsed laser, materials processing, and frequency comb spectroscopy.
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