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Materials 2016, 9(11), 917;

A Filmy Black-Phosphorus Polyimide Saturable Absorber for Q-Switched Operation in an Erbium-Doped Fiber Laser

MOE Key Laboratory of Space Applied Physics and Chemistry, Shaanxi Key Laboratory of Optical Information Technology, School of Science, Northwestern Polytechnical University, Xi’an 710072, China
Author to whom correspondence should be addressed.
Academic Editor: Alessandro Salandrino
Received: 9 October 2016 / Revised: 2 November 2016 / Accepted: 9 November 2016 / Published: 11 November 2016
(This article belongs to the Special Issue Nonlinear Optical Material)
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We demonstrate an erbium-doped fiber laser passively Q-switched by a black-phosphorus polyimide film. The multi-layer black-phosphorus (BP) nanosheets were prepared via a liquid exfoliation approach exploiting N-methylpyrrolidone as the dispersion liquid. By mixing the BP nanosheets with polyimide (PI), a piece of BP–PI film was obtained after evaporating the mixture in a petri dish. The BP–PI saturable absorber had a modulation depth of 0.47% and was inserted into an erbium-doped fiber laser to realize passive Q-switched operations. The repetition rate of the Q-switched laser increased from 5.73 kHz to 31.07 kHz when the laser pump was enhanced from 31.78 mW to 231.46 mW. Our results show that PI is an excellent host material to protect BP from oxidation, and the BP–PI film can act as a promising nonlinear optical device for laser applications. View Full-Text
Keywords: black-phosphorus; Q-switched fiber lasers; saturable absorber black-phosphorus; Q-switched fiber lasers; saturable absorber

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Feng, T.; Mao, D.; Cui, X.; Li, M.; Song, K.; Jiang, B.; Lu, H.; Quan, W. A Filmy Black-Phosphorus Polyimide Saturable Absorber for Q-Switched Operation in an Erbium-Doped Fiber Laser. Materials 2016, 9, 917.

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