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Robust single frequency index-patterned laser design using a Fourier design method.

Niall D Boohan, Brian Corbett, Eoin P O'Reilly

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    Summary
    This summary is machine-generated.

    This study enhances mode selectivity in semiconductor lasers by strategically placing refractive index perturbations. Optimized perturbation patterns improve laser performance, even with fabrication errors.

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    Area of Science:

    • Optics and Photonics
    • Semiconductor Device Physics

    Background:

    • Discrete-mode semiconductor lasers are crucial for various applications.
    • Achieving high mode selectivity is essential for laser performance.
    • Fabry-Pérot cavities are common laser structures.

    Purpose of the Study:

    • To investigate the magnitude and robustness of mode selectivity in discrete-mode semiconductor lasers.
    • To explore the impact of refractive index perturbation patterns on mode selectivity.
    • To identify strategies for improving laser yield despite fabrication imperfections.

    Main Methods:

    • Utilized a Fourier-transform based method for analysis.
    • Introduced a small number of refractive index perturbations into a Fabry-Pérot laser cavity.
    • Considered three exemplar index perturbation patterns.

    Main Results:

    • Demonstrated significant improvement in modal selectivity.
    • Identified that avoiding perturbations near the cavity center enhances selectivity.
    • Showcased the ability to increase yield despite facet phase errors.

    Conclusions:

    • Strategic placement of refractive index perturbations is key to enhancing mode selectivity.
    • The chosen perturbation distribution function impacts laser performance.
    • The method offers a pathway to robust and high-yield semiconductor lasers.