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Monitoring and active stabilization of laser injection locking using beam ellipticity.

Umang Mishra, Vyacheslav Li, Sebastian Wald

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    We developed a new method to stabilize injection-locked lasers by monitoring output beam ellipticity. This technique enhances laser performance and has potential applications in the low-noise laser industry.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Semiconductor Lasers

    Background:

    • Laser injection locking is crucial for improving laser performance.
    • Stabilizing injection-locked lasers is essential for applications requiring high precision.
    • Existing methods may require complex modifications to laser systems.

    Purpose of the Study:

    • To present a novel and powerful method for stabilizing laser injection locking.
    • To demonstrate a non-invasive technique applicable to commercial laser systems.
    • To explore the potential of this method for enhancing laser tuning range and reducing noise.

    Main Methods:

    • Sensing variations in the output beam ellipticity of an optically seeded laser.
    • Utilizing the interference effect between the seeding beam and the injected laser output.
    • Applying the method to a commercial semiconductor laser without internal modifications.

    Main Results:

    • Successfully stabilized a commercial semiconductor laser injection-locked system.
    • Demonstrated that output beam ellipticity changes are indicative of locking stability.
    • Showcased the method's applicability to readily operational laser systems.

    Conclusions:

    • The developed method offers a powerful approach for laser injection locking stabilization.
    • This technique can be implemented non-invasively on existing laser systems.
    • The method shows potential for increasing mode-hop free tuning range and contributing to the low-noise laser industry.