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    A novel parity-time-structured Bragg reflection waveguide enables high-power lasers by confining optical fields to a low-index core. This design mitigates heat buildup and suppresses unwanted modes for efficient, high-output laser performance.

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    Area of Science:

    • Photonics and optical engineering
    • Laser physics and technology

    Background:

    • High-power lasers are crucial for various applications.
    • Catastrophic optical damage and heat buildup limit current laser power.
    • Efficient laser design requires optimized optical field confinement and mode control.

    Purpose of the Study:

    • To propose and analyze a parity-time-structured Bragg reflection waveguide for high-power laser realization.
    • To enhance the catastrophic optical damage threshold for high output power.
    • To mitigate heat buildup and suppress transverse coupler modes.

    Main Methods:

    • Theoretical analysis of a parity-time-structured Bragg reflection waveguide.
    • Design considerations for single transverse mode operation.
    • Optical field confinement within a low-index core.
    • Strategic placement of optical injection in outer claddings.

    Main Results:

    • Demonstration of a single transverse mode with optical field confined to the low-index core.
    • Mitigation of heat buildup through shifted optical injection.
    • Suppression of transverse coupler modes.
    • Achieved high output power with a short cavity length and low lasing threshold.

    Conclusions:

    • The proposed parity-time-structured Bragg reflection waveguide is a promising platform for high-power lasers.
    • The design effectively improves the damage threshold and power conversion efficiency.
    • This approach offers a pathway to overcome limitations in current high-power laser systems.