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High performance distributed feedback quantum cascade laser emitting at λ∼6.12um.

Fengmin Cheng, Jinchuan Zhang, Yongqiang Sun

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    We developed new distributed feedback quantum cascade lasers emitting at 6.12 µm. These lasers show high performance and stable single-mode operation up to 100 °C, ideal for portable sensors.

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    Area of Science:

    • Semiconductor Lasers
    • Quantum Cascade Lasers
    • Mid-Infrared Photonics

    Background:

    • Quantum cascade lasers (QCLs) are crucial for mid-infrared applications.
    • Improving QCL performance, especially low threshold current and high operating temperature, remains a key challenge.
    • Distributed feedback (DFB) structures enhance single-mode operation in QCLs.

    Purpose of the Study:

    • To report on distributed feedback quantum cascade lasers (DFB-QCLs) emitting at 6.12 µm.
    • To demonstrate high device performance through optimized material epitaxy and active region design.
    • To evaluate the lasers' operational stability and suitability for sensor applications.

    Main Methods:

    • Fabrication of DFB-QCLs utilizing optimized materials epitaxy.
    • Implementation of a modified bound-to-continuum transition active region.
    • Incorporation of three stages of phonon scattering for enhanced performance.
    • Characterization of device performance in continuous wave (CW) mode at various temperatures.

    Main Results:

    • Achieved emission at a wavelength of 6.12 µm.
    • Demonstrated a low threshold current of 130 mA (0.77 kA/cm²) for a 2-mm-long device.
    • Obtained an optical output power of 69 mW at 20 °C in CW mode.
    • Confirmed stable single-mode operation up to 100 °C with minimal mode hopping (41 nm wavelength shift).
    • Reported over 8 mW optical output power at 100 °C.

    Conclusions:

    • Optimized epitaxy and active region design lead to high-performance DFB-QCLs.
    • The developed lasers exhibit excellent temperature stability and single-mode operation.
    • These low-threshold, high-performance QCLs are well-suited for portable and integrated sensor systems.