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PbS quantum dots as a saturable absorber for ultrafast laser

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Abstract

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.

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DOI:10.1364/prj.6.001028

所属栏目:Lasers and laser optics

基金项目:National Natural Science Foundation of China (NSFC)10.13039/501100001809 (51572120, 61504064); Natural Science Foundation of Jiangsu Province10.13039/501100004608 (BK20150847, BK20161521, BK20170912); Nanjing University of Posts and Telecommunications (NUPT)10.13039/501100005374 (NY217129, NY218023).

收稿日期:2018-07-23

录用日期:2018-08-31

网络出版日期:2018-09-11

作者单位    点击查看

Ling Yun:College of Electronic and Optical Engineering & College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210046, China
Yang Qiu:College of Electronic and Optical Engineering & College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210046, China
Conghao Yang:College of Electronic and Optical Engineering & College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210046, China
Jie Xing:College of Electronic and Optical Engineering & College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210046, China
Kehan Yu:College of Electronic and Optical Engineering & College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210046, China
Xiangxing Xu:Jiangsu Key Laboratory of Biofunctional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210046, Chinae-mail: xuxx@njnu.edu.cn
Wei Wei:College of Electronic and Optical Engineering & College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210046, China

联系人作者:Kehan Yu(kehanyu@njupt.edu.cn)

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引用该论文

Ling Yun, Yang Qiu, Conghao Yang, Jie Xing, Kehan Yu, Xiangxing Xu, and Wei Wei, "PbS quantum dots as a saturable absorber for ultrafast laser," Photonics Research 6(11), 1028-1032 (2018)

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