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Second harmonic generation in a hollow-core fiber filled with GaSe nanosheets

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Abstract

Frequency conversions using various all-fiber nonlinear devices can benefit many applications, including communications, sensing, microscope, and imaging. In this study, we report in-fiber second harmonic generation (SHG) in an optical hollow-core fiber (HCF) that can be used for frequency conversion. The HCF filled with a dispersion of gallium selenide (GaSe) nanosheets in the ultraviolet-cured optical adhesive supports a well-propagating mode in the fiber core, which enables effective light interaction with dispersed GaSe nanosheets and a strong SHG process. Based on theoretical analysis, the optimal HCF length for maximizing SHG is approximately 0.41 mm. The broadband SHG of the GaSe-filled HCF device is demonstrated by tuning the pump wavelength from 1460 to 1600 nm. Moreover, a time-varied SHG in the device is revealed due to additional second-order susceptibility induced by the polarization of silica. The proposed device with a compact and robust structure has the potential to be connected to existing all-fiber telecom and sensing systems for numerous nonlinear engineering applications.

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Acknowledgements

This work was supported by National Natural Science Foundation of China (Grant Nos. 61775182, 61975166, 61775183), Natural Science Basic Research Plan in Shaanxi Province of China (Grant No. 2019JM-330), and Fundamental Research Funds for the Central Universities. We also thank the Analytical & Testing Center of NPU for their assistance with the material and device characterizations.

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Authors and Affiliations

  1. MOE Key Laboratory of Material Physics and Chemistry Under Extraordinary Conditions and Shaanxi Key Laboratory of Optical Information Technology, School of Physical Science and Technology, Northwestern Polytechnical University, Xi’an, 710129, China

    Zhen Hao, Yuxin Ma, Biqiang Jiang, Yueguo Hou, Ailun Li, Ruixuan Yi, Xuetao Gan & Jianlin Zhao

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  1. Zhen Hao
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  2. Yuxin Ma
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  3. Biqiang Jiang
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  4. Yueguo Hou
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  5. Ailun Li
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  6. Ruixuan Yi
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  7. Xuetao Gan
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  8. Jianlin Zhao
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Correspondence to Biqiang Jiang or Xuetao Gan.

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Hao, Z., Ma, Y., Jiang, B. et al. Second harmonic generation in a hollow-core fiber filled with GaSe nanosheets. Sci. China Inf. Sci. 65, 162403 (2022). https://doi.org/10.1007/s11432-021-3331-3

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  • DOI: https://doi.org/10.1007/s11432-021-3331-3

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