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Highly efficient second-harmonic generation in a tellurite optical fiber.

Tonglei Cheng, Yuzhe Xiao, Shuguang Li

    Optics Letters
    |October 1, 2019
    PubMed
    Summary

    Researchers developed a novel tellurite optical fiber, achieving the highest second-harmonic generation (SHG) efficiency in non-silica fibers. This breakthrough offers new insights into nonlinear optical phenomena in advanced fiber materials.

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    Area of Science:

    • Materials Science
    • Optics and Photonics
    • Nonlinear Optics

    Background:

    • Tellurite glasses offer unique nonlinear optical properties.
    • Achieving efficient nonlinear processes in optical fibers is crucial for photonics applications.
    • Previous research has explored various glass compositions for optical fibers.

    Purpose of the Study:

    • To fabricate a low-loss tellurite optical fiber.
    • To investigate second-harmonic generation (SHG) in the fabricated fiber.
    • To explore the underlying physical mechanisms of SHG in tellurite fibers.

    Main Methods:

    • Fabrication of a step-index tellurite optical fiber using TeO2-Bi2O3-ZnO-Na2O glass.
    • Utilizing a nanosecond laser at ~1545 nm as the pump source.

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  • Analyzing nonlinear optical phenomena, including SHG and four-wave mixing.

    • Main Results:

    • Fabricated tellurite fiber exhibits low loss (~0.02 dB/m at ~1545 nm).
    • Observed SHG with a conversion efficiency up to ~1.15% at 20 mW, the highest reported for non-silica fibers.
    • Identified two potential models for SHG: chi(2)-induced nonlinear polarization and chi(3)-induced four-wave mixing.

    Conclusions:

    • The developed tellurite optical fiber demonstrates excellent performance for nonlinear applications.
    • The study provides a new perspective on the physical mechanisms governing SHG in optical fibers.
    • This work paves the way for advanced photonic devices utilizing tellurite fiber technology.