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Broad tuning range, high power quantum cascade laser at λ ∼ 7.4 µm.

Jun-Hong Liu, Huan Wang, Jin-Chuan Zhang

    Optics Express
    |October 27, 2022
    PubMed
    Summary

    This study presents a high-power quantum cascade laser (QCL) with excellent temperature stability and a wide tuning range. The QCL achieves significant output power and high efficiency, making it suitable for various applications.

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    Area of Science:

    • Quantum optics
    • Semiconductor lasers
    • Mid-infrared photonics

    Background:

    • Quantum cascade lasers (QCLs) are crucial semiconductor devices for generating coherent light in the mid-infrared spectrum.
    • High output power and broad tunability are key performance metrics for QCLs in applications like spectroscopy and sensing.

    Purpose of the Study:

    • To report a high-power quantum cascade laser (QCL) operating at λ∼7.4 µm.
    • To demonstrate excellent temperature stability and a broad tuning range for the developed QCL.

    Main Methods:

    • Careful design and optimization of the active region and waveguide structure of the QCL.
    • Characterization of output power, wall-plug efficiency (WPE), and temperature stability (T0, T1).
    • Evaluation of the external cavity (EC) tuning range and far-field mode characteristics.

    Main Results:

    • Continuous-wave (CW) output power of 1.36 W at 293 K and 0.5 W at 373 K, demonstrating excellent temperature stability.
    • High wall-plug efficiency (WPE) of 8% (CW) and 13.6% (pulsed) at 293 K.
    • A broad external cavity (EC) tuning range of 280 cm⁻¹ (6.54 µm to 8 µm) in pulsed operation and 226 mW CW single-mode output power at 293 K.

    Conclusions:

    • The developed QCL exhibits high power, excellent temperature stability, and a wide tuning range, suitable for demanding mid-infrared applications.
    • The optimized device design facilitates robust performance across a significant temperature range (283 K to 373 K).
    • The QCL's capabilities in both CW and pulsed modes, including single-mode operation, highlight its versatility.