Ultrasmall 2D NbSe2 based quantum dots used for low threshold ultrafast lasers

Ultrasmall NbSe 2 quantum dots (QDs) with an average diameter of 2.68 nm were successfully fabricated and investigated. By employing the NbSe 2 quantum dots (QDs) as a saturable absorber, highly stable ultrafast laser pulse trains with a duration of 765 fs or 380 ps were successfully generated from...

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Bibliographic Details
Published inJournal of materials chemistry. C, Materials for optical and electronic devices Vol. 6; no. 46; pp. 12638 - 12642
Main Authors Shi, Yihuan, Long, Hui, Liu, Shunxiang, Tsang, Yuen Hong, Wen, Qiao
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 2018
Subjects
Absorbers
Doped fibers
Erbium
Fiber lasers
Lasers
Nonlinear optics
Optical properties
Photonics
Quantum dots
Ultrafast lasers
Ytterbium
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Summary:Ultrasmall NbSe 2 quantum dots (QDs) with an average diameter of 2.68 nm were successfully fabricated and investigated. By employing the NbSe 2 quantum dots (QDs) as a saturable absorber, highly stable ultrafast laser pulse trains with a duration of 765 fs or 380 ps were successfully generated from mode-locking erbium or ytterbium-doped fiber laser systems by using the fabricated NbSe 2 QDs. The obtained laser pump power threshold for the mode-locking operation of the Er-doped fiber laser was 15 mW, which is the lowest value recorded among 2D materials based saturable absorbers. Our results give a promising contribution to the research field by demonstrating the strong nonlinear optical properties of these novel ultrasmall NbSe 2 QDs. It also opens up new opportunities for the use of these novel materials for nonlinear optics and ultrafast laser photonic technologies. Low threshold ultrafast fiber lasers in 1.5 based NbSe 2 quantum dots saturable absorbers have been successfully fabricated and investigated.
ISSN:2050-7526
2050-7534
DOI:10.1039/c8tc04635b