PbS quantum dots as a saturable absorber for ultrafast laser
| Autor: | Conghao Yang, Yang Qiu, Kehan Yu, Jie Xing, Ling Yun, Xiangxing Xu, Wei Wei |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
business.industry Band gap Physics::Medical Physics Physics::Optics Saturable absorption 02 engineering and technology 021001 nanoscience & nanotechnology Laser 01 natural sciences Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention Nanomaterials 010309 optics Condensed Matter::Materials Science law Quantum dot 0103 physical sciences Optoelectronics Photonics 0210 nano-technology business Ultrashort pulse Bohr radius |
| Zdroj: | Photonics Research. 6:1028 |
| ISSN: | 2327-9125 |
| DOI: | 10.1364/prj.6.001028 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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