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Loss-tailoring single-mode high-power supersymmetric lasers.

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    This study confirms mode instability in supersymmetric diode lasers at high currents. A novel loss-tailoring design achieves stable fundamental-mode output and improved beam quality for diode lasers.

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    Area of Science:

    • Optics and Photonics
    • Semiconductor Lasers

    Background:

    • High beam quality and high power in diode lasers are often conflicting.
    • Mode instability in supersymmetric structures at higher operating currents is a known issue.

    Purpose of the Study:

    • To theoretically and experimentally confirm mode instability in supersymmetric structures.
    • To propose a novel loss-tailoring diode laser design for stable fundamental-mode operation.

    Main Methods:

    • Theoretical analysis of mode instability.
    • Experimental verification using fabricated diode lasers.
    • Implementation of a loss-tailoring mechanism in a supersymmetric structure.

    Main Results:

    • Mode instability confirmed in supersymmetric structures at higher currents.
    • A loss-tailoring diode laser achieved stable fundamental-lateral-mode output.
    • Reduced far-field FWHM by 65% and improved M² by 37% compared to traditional lasers.

    Conclusions:

    • The proposed loss-tailoring diode laser effectively suppresses higher-order lateral modes.
    • This design enables stable, high-quality beam output from diode lasers at higher operating currents.