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Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry
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Room temperature quantum cascade lasers with 22% wall plug efficiency in continuous-wave operation.

F Wang, S Slivken, D H Wu

    Optics Express
    |July 19, 2020
    PubMed
    Summary

    Quantum cascade lasers (QCLs) achieve record efficiency, with pulsed operation reaching 29.3% wall plug efficiency (WPE) and continuous-wave operation demonstrating 22% WPE at room temperature.

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    Area of Science:

    • Semiconductor Physics
    • Optoelectronics
    • Laser Technology

    Background:

    • Quantum cascade lasers (QCLs) are semiconductor devices crucial for mid-infrared applications.
    • Improving the efficiency and output power of QCLs is essential for advancing their technological utility.

    Purpose of the Study:

    • To demonstrate enhanced efficiency in quantum cascade lasers (QCLs) operating at 4.9 µm.
    • To achieve high wall plug efficiency (WPE) in both pulsed and continuous-wave (CW) modes at room temperature.

    Main Methods:

    • Utilized an established QCL design, enhanced by simulation, to increase the number of emitting stages.
    • Fabricated and packaged 5-mm-long, 8-µm-wide QCLs with a buried ridge waveguide structure.

    Main Results:

    • Achieved a peak WPE of 29.3% in pulsed operation at room temperature.
    • Demonstrated 22% CW WPE and 5.6 W CW output power at room temperature.
    • Reached an optical power density of ~35 MW/cm² at the output facet without damage.

    Conclusions:

    • The increased number of stages in QCLs significantly boosts efficiency.
    • High-performance QCLs with excellent WPE and output power are achievable through optimized design and fabrication.
    • These results pave the way for more powerful and efficient mid-infrared laser sources.