PbS quantum dots as a saturable absorber for ultrafast laser
PbS quantum dots as a saturable absorber for ultrafast laser
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PbS量子点作为超快激光的可饱和吸收体
DOI：
10.1364/prj.6.001028
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发表时间：
2018-11-01
影响因子：
7.6
通讯作者：
Wei, Wei
中科院分区：
文献类型：
--
作者：
Yun, Ling;Qiu, Yang;Wei, Wei
低维纳米材料由于其独特和多用途的特性，在巨大的电子和光电子应用中非常有吸引力。PbS量子点（QDs）具有较大的玻尔半径和可调谐的带隙，在近红外区域的光子应用中特别有趣。本文研究了油酸覆盖胶体PbS量子点作为饱和吸收剂的超短脉冲产生。PbS量子点在1550 nm处表现出突出的非线性饱和吸收特性：调制深度达44.5%，热损伤阈值大于30 mJ/cm2。通过将PbS量子点集成到光纤激光器中，在1563 nm处实现了短为559 fs、带宽为4.78 nm的变换限制孤子脉冲。许多应用可能受益于非线性饱和吸收特性的PbS量子点，如近红外脉冲激光器和调制器。
Low-dimensional nanomaterials, owing to their unique and versatile properties, are very attractive for enormous electronic and optoelectronic applications. PbS quantum dots (QDs), characterized by a large Bohr radius and size-tunable bandgap, are especially interesting for photonic applications in the near-infrared region. Here, oleic acid capped colloidal PbS QDs as a saturable absorber are investigated for ultrashort-pulse generation. The PbS QDs exhibit outstanding nonlinear saturable absorption properties at 1550 nm: a modulation depth up to 44.5% and a thermal damage threshold larger than 30 mJ/cm2. By incorporating PbS QDs into a fiber laser, a transform-limited soliton pulse as short as 559 fs with a bandwidth of 4.78 nm is realized at 1563 nm. Numerous applications may benefit from the nonlinear saturable absorption properties of PbS QDs, such as near-infrared pulsed lasers and modulators.