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Updated: Jun 23, 2025

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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Tunable broadband polarization retarders.

Hristina S Hristova, Svetoslav S Ivanov, Nikolay V Vitanov

    Optics Letters
    |June 14, 2024
    PubMed
    Summary

    We propose a tunable polarization retarder using stacked wave plates. This composite retarder offers adjustable retardance across a broad spectral bandwidth by tuning a single middle element.

    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Polarization retarders are crucial optical components.
    • Achieving tunable retardance with broad spectral bandwidth is challenging.

    Purpose of the Study:

    • To theoretically propose a novel tunable polarization retarder.
    • To enable arbitrary retardance control while maintaining broadband operation.

    Main Methods:

    • Designing a composite retarder (CR) from stacked half-wave and quarter-wave retarders.
    • Theoretically analyzing the retardance tuning mechanism by adjusting the middle retarder's orientation.

    Main Results:

    • The proposed composite retarder allows for arbitrary retardance tuning.
    • Broad spectral bandwidth is maintained throughout the tuning process.

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  • Tuning is achieved by adjusting only the middle retarder.

    • Conclusions:

    • The proposed composite retarder offers a practical solution for tunable polarization control.
    • This design is suitable for applications requiring broadband spectral operation.