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Near-diffraction-limited Bragg reflection waveguide lasers.

Lijie Wang, Zhen Li, Cunzhu Tong

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    Summary
    This summary is machine-generated.

    We developed a wider waveguide laser (BRL) for improved performance. This design achieves near-diffraction-limited beams with low divergence and high power, simplifying optical coupling.

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    Area of Science:

    • Optics and Photonics
    • Semiconductor Lasers

    Background:

    • Conventional waveguide lasers often have limited ridge widths, restricting performance.
    • Thick vertical waveguides offer potential for improved mode expansion and scalability.

    Purpose of the Study:

    • To investigate the performance of tapered Bragg reflection waveguide lasers (BRLs) with significantly larger ridge widths.
    • To determine the optimal taper angle for maximizing far-field performance in these devices.

    Main Methods:

    • Fabrication of a near-diffraction-limited tapered Bragg reflection waveguide laser (BRL) with a 10 μm ridge width.
    • Investigation of the role of taper angle on laser performance, focusing on vertical waveguide characteristics.
    • Characterization of beam divergence, power output, and beam quality (M²).

    Main Results:

    • A taper angle of 3° yielded optimal far-field performance.
    • Achieved extremely low vertical divergence (14.5°) and lateral divergence (2.8° for 95% power).
    • Demonstrated continuous-wave power exceeding 1 W with excellent beam quality (M² ≈ 1.3 vertical, < 2 lateral).

    Conclusions:

    • Wider ridge widths in BRLs, enabled by thick vertical waveguides, allow for scalable, single lateral mode operation.
    • The optimized BRL design offers narrow beam divergence and high beam quality, facilitating simple and cost-effective collimation and coupling.
    • This advancement in laser design opens possibilities for more efficient and versatile laser systems.