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    We developed InGaAs/GaAs quantum well lasers using coupled large optical cavity (CLOC) structures. These lasers achieve stable, single-mode emission with a Gaussian beam profile, reducing optical divergence for improved performance.

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    Area of Science:

    • Semiconductor Lasers
    • Optoelectronics
    • Quantum Well Technology

    Background:

    • Broadened waveguide lasers often suffer from multimode emission, limiting beam quality.
    • Controlling vertical mode emission is crucial for high-power, single-mode laser applications.

    Purpose of the Study:

    • To demonstrate transverse single-mode emission from InGaAs/GaAs quantum well lasers.
    • To suppress high-order vertical modes in broadened waveguide lasers.
    • To achieve a stable, Gaussian-shaped far-field profile.

    Main Methods:

    • Utilizing coupled large optical cavity (CLOC) structures.
    • Designing coupled single-mode passive waveguides.
    • Employing resonant tunneling to suppress unwanted modes.

    Main Results:

    • Achieved stable transverse single-mode emission.
    • Observed Gaussian-shaped vertical far-field profiles.
    • Demonstrated reduced beam divergence of approximately 22° FWHM in continuous-wave operation.

    Conclusions:

    • CLOC structures effectively suppress high-order vertical modes.
    • The developed lasers offer improved beam quality and reduced divergence.
    • This technology is promising for applications requiring high-quality laser beams.