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Issue 3, 2020
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VSe2 nanosheets for ultrafast fiber lasers

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In this work, we investigate VSe2 for generating femtosecond and large energy mode-locked laser pulses for the first time. Two types of VSe2 based saturable absorbers (SAs), microfiber–VSe2 and VSe2/polyvinyl alcohol (PVA), are prepared, which exhibit strong nonlinear optical characteristics with a modulation depth (ΔT) of 22.5% and 1.849%, respectively. In contrast to other transition metal dichalcogenides (TMDCs), theoretical calculations show that VSe2 is a metallic TMDC SA. With the implementation of microfiber–VSe2, conventional soliton mode-locking Er-doped fiber (EDF) laser is demonstrated with an ultrashort pulse duration of 910 fs. Based on VSe2/PVA, a large energy EDF laser is established. The maximum single pulse energy is 25.57 nJ. This study suggests that VSe2 possesses application potential in ultrafast photonics and provides a valuable strategy for the development of TMDC based devices with desirable optoelectronic properties.

Graphical abstract: VSe2 nanosheets for ultrafast fiber lasers

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Article information

10 Nov 2019
04 Dec 2019
First published
17 Dec 2019

J. Mater. Chem. C, 2020,8, 1104-1109
Article type

VSe2 nanosheets for ultrafast fiber lasers

L. Li, L. Pang, Q. Zhao, W. Liu and Y. Su, J. Mater. Chem. C, 2020, 8, 1104
DOI: 10.1039/C9TC06159B

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