4.6 Article

Direct generation of dip-type sidebands from WS2 mode-locked fiber laser

期刊

OPTICAL MATERIALS EXPRESS
卷 6, 期 8, 页码 2475-2486

出版社

OPTICAL SOC AMER
DOI: 10.1364/OME.6.002475

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资金

  1. National Natural Science Foundation of China [61575050, 61505039]
  2. 111 project of the Harbin Engineering University [B13015]
  3. China Postdoctoral Science Foundation [2015M581446]

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In this paper, we demonstrated the direct generation of dip-type sidebands from a passively mode-locked fiber laser based on the evanescent field interaction of two-dimensional material WS2 and microfiber. The WS2 nanosheets in polyvinyl alcohol solution are prepared through the liquid-phase exfoliation method and transferred onto a tapered fiber by the optical deposition method. The WS2-deposited microfiber device could both operate as a mode-locker for soliton generation and induce a strong polarization effect to constitute an artificial polarizer for dip-type sidebands formation. In experiment, six kinds of dip-sidebands, namely, dip-dip type, hybrid peak-dip and dip type (I, II), dual-peak-dip type (I, II), and nearly-flat-top type are achieved by properly adjusting the pump strength and the polarization state in the laser cavity. Study found that the dynamic evolution of the dip-type sidebands along with the pump power is not reversible. In addition, we also obtained the maximum depth of similar to 16.8 dB and similar to 22 dB for dual-peak-dip type. and dual-peak-dip type II, respectively, and their second-order forms. Our study shows clearly that WS2-assisted microfiber device can be as a mode-locker for soliton generation and a polarizer for studying nonlinear optics phenomenon in the fiber lasers simultaneously. (C) 2016 Optical Society of America

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