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Updated: Sep 9, 2025

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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High-brightness PT-symmetric laser bars with exceptional point modulation via spectral beam combining.

Zijie Gao, Weiqiao Zhang, Ting Fu

    Optics Letters
    |August 29, 2025
    PubMed
    Summary

    This study demonstrates enhanced semiconductor laser performance using PT-symmetric systems and spectral beam combining. This method significantly reduces the threshold current and boosts brightness for advanced laser applications.

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    Area of Science:

    • Optics and Photonics
    • Semiconductor Lasers
    • Nonlinear Optics

    Background:

    • Parity-time (PT)-symmetric systems offer unique optical properties.
    • Semiconductor laser bars require improved efficiency and beam quality.
    • Spectral beam combining is a technique for high-power laser systems.

    Purpose of the Study:

    • To experimentally demonstrate PT-symmetric semiconductor laser bars.
    • To enhance laser performance via spectral beam combining.
    • To investigate PT-symmetry-breaking threshold reduction and brightness enhancement.

    Main Methods:

    • Fabrication of PT-symmetric semiconductor laser bars.
    • Experimental harnessing using spectral beam combining.
    • Numerical analysis with a three-mirror equivalent model and gain-clamping effect.

    Main Results:

    • A 22.20% reduction in the PT-symmetry-breaking threshold current was observed.
    • Measured M² values of 1.83 (slow axis) and 1.86 (fast axis) at 26 A.
    • Calculated peak brightness of 411 MW·cm⁻²·sr⁻¹ with 13.16 W output power.

    Conclusions:

    • PT-symmetric semiconductor laser bars with spectral beam combining show improved performance.
    • External cavity feedback enables flexible exceptional-point control.
    • The study achieved enhanced brightness and reduced threshold current in laser systems.