SCIENCE CHINA Information Sciences, Volume 62 , Issue 12 : 220406(2019) https://doi.org/10.1007/s11432-019-2677-9

Nonlinear photoresponse of metallic graphene-like VSe$_2$ ultrathin nanosheets for pulse laser generation

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  • ReceivedAug 26, 2019
  • AcceptedOct 14, 2019
  • PublishedNov 12, 2019



This work was supported by National Natural Science Foundation of China (NSFC) (Grant No. 61875223), Natural Science Foundation of Hunan Province (Grant No. 2018JJ3610), Key Research Program of Frontier Sciences of Chinese Academy of Sciences (Grant No. QYZDB-SSW-SLH031).


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  • Figure 1

    (Color online) Crystal structure and characterizations of as-synthesized VSe$_2$ nanoflakes after liquid-phase exfoliation. (a) The schematic diagram of crystal structure of layered VSe$_2$; (b) the XRD pattern of VSe$_2$ crystals; (c) the Raman spectrum of a few-layer VSe$_2$ nanoflake on a Si substrate; (d) the TEM micrograph of VSe$_2$ nanoflakes; (e), (f) the high resolution TEM image of the VSe$_2$ nanoflake and its corresponding SAED pattern.

  • Figure 2

    (Color online) (a) A typical SEM image of a VSe$_2$ crystal with ahexagonal shape; (b)–(d) the corresponding EDX mappings and EDX spectrum with anatomic ratio of V and Se elements showed in (a); (e) an AFM image of few-layer VSe$_2$ nanoflakes on a Si substrate with 285 nm SiO$_2$; (f) the corresponding optical photograph ($\times$100) and a height graph of thickness around 30 nm.

  • Figure 3

    (Color online) (a) the ultraviolet-visible absorption spectrum of VSe$_2$ nanosheets; (b) nonlinear SA curve of the VSe$_2$-SA at different light intensity.

  • Figure 4

    (Color online) Experimental setup for the VSe$_2$-based passively Q-switched fiber laser.

  • Figure 5

    (Color online) Output pulse properties. (a) Output power; (b) the variation of repetition rate and pulse duration with different pump power; (c) pulse energy as a function of pump power; (d) peak power versus pump power.

  • Figure 6

    (Color online) The properties of Q-switched pulse at the pump power of 263.1 mW. (a) Output spectrum;protect łinebreak (b) pulse train; (c) zoomed-in view of a single pulse; (d) different ranges of RF spectra.

  • Figure 7

    (Color online) Q-switched pulse stability every 5 min for a total of 40 min. (a) Output spectrums; (b) bandwidth; (c) output power.