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Phase-locked terahertz quantum cascade laser array integrated with a Talbot cavity.

Yunfei Xu, Yongqiang Sun, Weijiang Li

    Optics Express
    |October 19, 2022
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    Summary
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    Phase-locked arrays of terahertz quantum cascade lasers (THz QCLs) overcome power limitations. This Talbot effect-based scheme achieves stable fundamental supermode operation and significant power amplification.

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    Area of Science:

    • Optics and Photonics
    • Semiconductor Lasers
    • Terahertz Technology

    Background:

    • Quantum cascade lasers (QCLs) are crucial for terahertz (THz) applications.
    • Increasing QCL power by widening ridges degrades beam quality due to high-order transverse modes.
    • Novel approaches are needed to enhance THz QCL power and beam quality.

    Purpose of the Study:

    • To develop a phase-locked array scheme for THz QCLs to boost power while maintaining beam quality.
    • To investigate the use of the Talbot effect for stable supermode operation in THz QCL arrays.
    • To demonstrate significant power amplification in a multi-element THz QCL array.

    Main Methods:

    • Fabrication of a phase-locked array of five THz QCL ridges.
    • Utilizing the Talbot effect for transverse mode control.
    • Adjusting the absorbing boundary width of individual ridges for stable fundamental supermode operation.

    Main Results:

    • Stable operation of the fundamental supermode was achieved by optimizing ridge boundary widths.
    • A five-element array demonstrated a four-fold increase in output power compared to a single ridge device.
    • The phase-locked array scheme exhibited high power amplification efficiency and stable mode selection.

    Conclusions:

    • The phase-locked array scheme effectively enhances THz QCL power without sacrificing beam quality.
    • Talbot effect-based designs offer a promising route for high-performance THz QCLs.
    • This approach is suitable for scalable fabrication and future THz photonic systems.