• Photonics Research
  • Vol. 7, Issue 12, 1479 (2019)
Yang Xu, Su Chen, Zhiqiang Wang, Bing Sun..., Hongdan Wan and Zuxing Zhang*|Show fewer author(s)
Author Affiliations
  • Advanced Photonic Technology Lab, College of Electronic and Optical Engineering & College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
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    DOI: 10.1364/PRJ.7.001479 Cite this Article Set citation alerts
    Yang Xu, Su Chen, Zhiqiang Wang, Bing Sun, Hongdan Wan, Zuxing Zhang, "Cylindrical vector beam fiber laser with a symmetric two-mode fiber coupler," Photonics Res. 7, 1479 (2019) Copy Citation Text show less

    Abstract

    We demonstrate a passively mode-locked all-fiber laser generating cylindrical vector beams (CVBs) only using a symmetric two-mode fiber optical coupler (TMF-OC) for both high-order mode excitation and splitting. Theoretical analyses show that for a symmetric TMF-OC with appropriate taper diameter, the second-order mode can be excited and coupled into output tap with high purity due to the effective index difference of different modes. Based on the fabricated TMF-OC, the passively mode-locked fiber laser delivers pulsed CVBs at a center wavelength of 1564.4 nm with 3 dB linewidth of 11.2 nm, pulse duration of 2.552 ps, and repetition rate of 3.96 MHz. The purity of both radially and azimuthally polarized beams is estimated to be over 91%. Due to simple fabrication method of the TMF-OC and high purity of the generated CVBs, this mode-locked CVB fiber laser with all-fiber configuration has potential applications in optical trapping, optical communications, material processing, etc.
    dA1(z)dz=jK21A2(z)ej(β1β2)z,(1)

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    dA2(z)dz=jK12A1(z)ej(β2β1)z.(2)

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    A2(L)=jK120LA1(z)ej(β2β1)zdz.(3)

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    Yang Xu, Su Chen, Zhiqiang Wang, Bing Sun, Hongdan Wan, Zuxing Zhang, "Cylindrical vector beam fiber laser with a symmetric two-mode fiber coupler," Photonics Res. 7, 1479 (2019)
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