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Related Experiment Video

Updated: Mar 7, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Coherent emission from integrated Talbot-cavity quantum cascade lasers.

Bo Meng, Bo Qiang, Etienne Rodriguez

    Optics Express
    |March 1, 2017
    PubMed
    Summary

    We demonstrated phase-locked quantum cascade laser (QCL) arrays using a Talbot cavity, achieving over 4 W peak power. This breakthrough enables high beam quality for continuous wave QCLs.

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    Area of Science:

    • Optics and Photonics
    • Semiconductor Lasers
    • Quantum Electronics

    Background:

    • Quantum Cascade Lasers (QCLs) are crucial for mid-infrared applications.
    • Achieving high power and good beam quality from QCLs remains a challenge.
    • Phase-locking laser arrays can enhance output power and beam characteristics.

    Purpose of the Study:

    • To experimentally realize a phase-locked quantum cascade laser (QCL) array.
    • To investigate the performance of a monolithically integrated Talbot cavity for QCL arrays.
    • To demonstrate high output power and coherent operation in QCL arrays.

    Main Methods:

    • Fabrication of a six-element QCL array integrated with a Talbot cavity.
    • Characterization of optical power and slope efficiency at room temperature.
    • Analysis of the coherent supermode operation using a theoretical model.

    Main Results:

    • Maximum peak power of ~4 W achieved, over 5x that of a single ridge laser.
    • Slope efficiency of 1 W/A demonstrated at room temperature.
    • In-phase coherent supermode operation confirmed across the dynamic range.

    Conclusions:

    • The monolithically integrated Talbot cavity is effective for phase-locking QCL arrays.
    • This approach offers a significant power increase and potential for high beam quality.
    • Reduced thermal resistance makes this structure suitable for continuous wave high-power QCLs.