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Tungsten disulphide for ultrashort pulse generation in all-fiber lasers

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Abstract

Tungsten disulphide (WS2), which exhibits excellent saturable absorption properties, has attracted much attention in the applications of photonic devices. In this paper, WS2 is applied for the preparation of a saturable absorber (SA). Using the pulsed laser deposition (PLD) method, WS2 is deposited on the side surface of the tapered fiber. In order to obtain larger non-linearity of the SAs with evanescent wave interaction, the tapered fiber had a smaller waist diameter and longer fused zone. Gold film was deposited on the fiber-taper WS2 SAs to improve their reliability and avoid oxidation and corrosion. Employing the balanced twin-detector method, the modulation depth of the fiber-taper WS2 SAs was measured to be 17.2%. With the fiber-taper WS2 SA, a generated pulse with 246 fs duration and a 57 nm bandwidth was obtained at 1561 nm. The electrical signal to noise ratio was better than 92 dB. To our knowledge, the pulse duration was the shortest among the reported all-fiber lasers with transition metal dichalcogenide (TMD) SAs. These results indicate that fiber-taper WS2 SAs with smaller waist diameter and longer fused zone are promising photonic devices for ultrashort pulse generation in all-fiber lasers.

Graphical abstract: Tungsten disulphide for ultrashort pulse generation in all-fiber lasers

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Publication details

The article was received on 09 Feb 2017, accepted on 27 Feb 2017 and first published on 03 Mar 2017


Article type: Paper
DOI: 10.1039/C7NR00971B
Citation: Nanoscale, 2017, Advance Article
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    Tungsten disulphide for ultrashort pulse generation in all-fiber lasers

    W. Liu, L. Pang, H. Han, K. Bi, M. Lei and Z. Wei, Nanoscale, 2017, Advance Article , DOI: 10.1039/C7NR00971B

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