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Hybrid algorithm for initial phase calibration of optical phased array.

Hongdong Zhang, Rui Wang, Kunyang Du

    Optics Express
    |March 5, 2024
    PubMed
    Summary
    This summary is machine-generated.

    A new hybrid algorithm rapidly reduces phase noise in optical phased arrays (OPAs) by narrowing the search range. This method improves laser coherence and beam scanning accuracy, overcoming limitations of traditional adaptive optics.

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    Area of Science:

    • Optics and Photonics
    • Laser Technology
    • Adaptive Optics

    Background:

    • Phase noise significantly limits laser coherence and beam scanning accuracy in optical phased arrays (OPAs).
    • Current adaptive optics methods for phase noise mitigation suffer from slow convergence and local optima due to OPA complexity.

    Purpose of the Study:

    • To develop a faster and more robust calibration method for optical phased arrays (OPAs).
    • To overcome the limitations of traditional adaptive optics in mitigating phase noise for improved beam quality.

    Main Methods:

    • A novel narrowing search range algorithm was developed to efficiently reduce phase noise.
    • The proposed algorithm was combined with the stochastic parallel gradient descent (SPGD) algorithm for initial optimization.
    • Simulations and experimental validations were performed using OPAs with varying array elements.

    Main Results:

    • The hybrid algorithm significantly expedited the OPA calibration process compared to existing methods.
    • The method demonstrated effective phase noise reduction, enhancing laser coherence and beam scanning accuracy.
    • The algorithm requires simple experimental equipment for implementation.

    Conclusions:

    • The proposed hybrid algorithm offers a rapid and effective solution for phase noise calibration in OPAs.
    • This approach enhances OPA performance for applications requiring high laser coherence and precise beam control.
    • The method's simplicity and broad applicability make it suitable for various experimental setups.