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High power and single mode quantum cascade lasers.

Alfredo Bismuto, Yves Bidaux, Stéphane Blaser

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    |July 14, 2016
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    Summary
    This summary is machine-generated.

    This study introduces a high-power, single-mode quantum cascade laser emitting at 4.68 μm. The laser demonstrates excellent wavelength stability and beam quality, paving the way for advanced photonic applications.

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    Area of Science:

    • Quantum optics
    • Semiconductor lasers
    • Infrared photonics

    Background:

    • Quantum cascade lasers (QCLs) are crucial for mid-infrared applications.
    • Achieving high optical power and single-mode operation simultaneously remains a challenge.

    Purpose of the Study:

    • To develop a high-power, single-mode quantum cascade laser.
    • To demonstrate wavelength selection using a buried distributed feedback reflector.
    • To characterize the laser's optical and beam properties.

    Main Methods:

    • Fabrication of a 6 mm long, 3.5 μm wide quantum cascade laser.
    • Integration of a buried distributed feedback reflector for wavelength selection.
    • Characterization of optical power, emission spectrum, and far-field beam profile.

    Main Results:

    • Nearly 1 W optical power achieved from a single-mode QCL.
    • Stable single-mode operation centered at 4.68 μm with >30 dB side mode suppression ratio.
    • Symmetric, single transverse-mode (TM00) emission with typical divergences of 41° (vertical) and 33° (horizontal).

    Conclusions:

    • The developed QCL offers high optical power and excellent single-mode performance.
    • The buried DFB reflector enables reliable wavelength selection.
    • The fabrication process is compatible with standard DFB processing, indicating potential for scalable production.