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Continuous-wave pumped frequency upconversions in an InSe-integrated microfiber.

Zhen Hao, Biqiang Jiang, Yueguo Hou

    Optics Letters
    |February 12, 2021
    PubMed
    Summary

    Continuous-wave lasers enable enhanced second-harmonic generation (SHG) and sum frequency generation (SFG) in indium selenide (InSe)-integrated microfibers. This novel material integration offers potential for polarization-controlled nonlinear optical applications within fiber systems.

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    Area of Science:

    • Nonlinear Optics
    • Materials Science
    • Photonics

    Background:

    • Layered materials offer unique optical properties for nonlinear applications.
    • Microfiber integration provides enhanced light-matter interaction for photonic devices.

    Purpose of the Study:

    • To demonstrate continuous-wave (CW)-pumped second-harmonic generation (SHG) and sum frequency generation (SFG) in indium selenide (InSe)-integrated microfibers.
    • To investigate the enhancement of nonlinear optical processes due to strong light-matter interaction.
    • To explore the potential for polarization control in SHG.

    Main Methods:

    • Fabrication of InSe nanosheets integrated onto a microfiber.
    • CW laser pumping to induce SHG and SFG.
    • Power-dependent measurements to analyze nonlinear process behavior.

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  • Polarization analysis to study SHG dependency.

    • Main Results:

    • Greatly enhanced SHG and SFG observed in InSe-integrated microfiber with milliwatt CW lasers.
    • Experimental results show quadratic and linear power dependencies for SHG and SFG, respectively.
    • Strong polarization dependence of SHG demonstrated, linked to the non-axisymmetrical InSe distribution.

    Conclusions:

    • Layered InSe integration significantly enhances nonlinear optical processes in microfibers.
    • The device exhibits controllable SHG polarization, paving the way for polarization manipulation.
    • The proposed InSe-integrated microfiber is a promising platform for all-fiber nonlinear optical applications.