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Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
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High-brightness LWIR quantum cascade lasers.

F Wang, S Slivken, M Razeghi

    Optics Letters
    |October 15, 2021
    PubMed
    Summary
    This summary is machine-generated.

    High-brightness long-wave infrared (LWIR) quantum cascade lasers (QCLs) were developed using band structure engineering. These LWIR QCLs offer high beam quality for atmospheric applications.

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    Area of Science:

    • Semiconductor Lasers
    • Optoelectronics
    • Infrared Technology

    Background:

    • Long-wave infrared (LWIR) quantum cascade lasers (QCLs) are crucial for atmospheric light transmission due to lower water absorption.
    • LWIR QCL development faces significant technological hurdles compared to shorter-wavelength counterparts.

    Purpose of the Study:

    • To demonstrate high beam-quality, single-mode LWIR QCLs with high brightness.
    • To overcome technological challenges in LWIR QCL development.

    Main Methods:

    • Utilized band structure engineering with a localized diagonal laser transition strategy.
    • Implemented an electrically isolated taper structure for out-coupler design.
    • Achieved continuous-wave operation at 15°C.

    Main Results:

    • Demonstrated high-brightness light extraction from a single facet across various LWIR wavelengths (8-10µm).
    • Achieved brightness levels up to 5.0 MWcm⁻²sr⁻¹ for 8µm, 2.2 MWcm⁻²sr⁻¹ for 9µm, and 2.0 MWcm⁻²sr⁻¹ for 10µm.
    • Obtained single-mode, high beam-quality output.

    Conclusions:

    • These findings represent a significant advancement in LWIR inter-sub-band semiconductor lasers.
    • The developed LWIR QCLs show potential for various applications requiring efficient atmospheric light transmission.