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Quantum cascade lasers: from tool to product.

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    Quantum cascade lasers (QCLs) are versatile mid-infrared and terahertz sources. Recent advancements have significantly improved their power, efficiency, and tunability for spectroscopy, sensing, and imaging applications.

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    Area of Science:

    • Optoelectronics
    • Laser Physics
    • Solid-State Physics

    Background:

    • Quantum cascade lasers (QCLs) are crucial semiconductor sources for mid-infrared and terahertz frequencies.
    • Over the past two decades, QCL technology has seen substantial progress in performance and application scope.

    Purpose of the Study:

    • To highlight the advancements in QCLs, including power, efficiency, spectral coverage, and tunability.
    • To discuss emerging QCL designs for next-generation tunable mid-infrared sources.
    • To present the development of terahertz sources based on nonlinear generation in QCLs.

    Main Methods:

    • Development of broadband heterogeneous QCLs for wide spectral ranges (3-12 μm).
    • Implementation of monolithic sampled grating designs for wavelength agile QCLs.
    • Integration of on-chip beam combiners for enhanced mid-infrared sources.
    • Utilizing nonlinear generation in QCLs to access terahertz frequencies.

    Main Results:

    • QCLs achieve high continuous wave power output (up to 5.1 W at room temperature).
    • QCLs cover a broad frequency range (3-300 μm) by adjusting material composition.
    • Terahertz QCLs demonstrate room temperature continuous wave operation with high power (up to 1.9 mW) and wide tunability (1-5 THz).

    Conclusions:

    • QCLs are highly developed and versatile laser sources for mid-infrared and terahertz applications.
    • Ongoing research focuses on next-generation tunable sources for spectroscopy and sensing.
    • Terahertz QCLs offer significant potential for applications in spectroscopy, imaging, and communication.