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When a material is subjected to uniaxial stress, it elongates or contracts in the direction of the applied force, and also undergoes changes in the perpendicular directions. This behavior is crucial for understanding how materials behave under stress and is governed by mechanical properties such as Poisson's ratio v, which measures the ratio of transverse strain to axial strain.
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Single-transverse-mode waveguide-coupled deformed hexagonal resonator microlasers.

Fu-Li Wang, Yue-De Yang, Yong-Zhen Huang

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    Researchers developed novel hexagonal microlasers by introducing a center hole and circular arcs, significantly enhancing mode quality (Q-factors) and achieving single-transverse-mode operation. These advancements reduce device size and threshold current for improved laser performance.

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    Area of Science:

    • Semiconductor lasers
    • Optoelectronics
    • Photonics

    Background:

    • AlGaInAs/InP semiconductor material system is crucial for optoelectronic devices.
    • Hexagonal resonators offer unique optical properties but face challenges in mode quality and single-transverse-mode operation.
    • Enhancing mode quality (Q-factors) is essential for high-performance microlasers.

    Purpose of the Study:

    • To demonstrate waveguide-coupled deformed hexagonal resonator microlasers with enhanced Q-factors.
    • To achieve stable single-transverse-mode operation in hexagonal microlasers.
    • To reduce device size and threshold current for practical applications.

    Main Methods:

    • Introducing a circular hole in the center of hexagonal resonators with rounded corners.
    • Analyzing and experimentally demonstrating deformed hexagonal resonators with circular arc sides.
    • Optimizing deformation amplitude to enhance Q-factors and maintain single-transverse-mode properties.

    Main Results:

    • Single-mode lasing with side-mode suppression ratios up to 40 dB achieved in hexagonal microlasers with a center hole.
    • Pure single-transverse-mode properties maintained across the injection current tuning range.
    • Q-factors of fundamental transverse modes enhanced by two orders of magnitude in circular-side hexagonal microlasers.
    • Threshold current reduced to 2.4 mA in optimized devices.

    Conclusions:

    • Center holes and circular arc deformations are effective strategies for enhancing Q-factors and achieving single-transverse-mode operation in hexagonal microlasers.
    • Optimized deformed hexagonal resonators offer a promising pathway for miniaturized, low-threshold laser devices.
    • The demonstrated microlasers exhibit excellent performance suitable for various photonic integrated circuit applications.