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Active phase locking of a three-aperture array using a corner cube lateral transfer reflector.

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    A new method uses retroreflectors for coherent beam combining in optical communication arrays. This technique simplifies optics, enabling efficient phase and tip/tilt locking for large-diameter systems.

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    Area of Science:

    • Optics and Photonics
    • Free-Space Optical Communication

    Background:

    • Coherent beam combining is crucial for high-power, long-distance optical communication.
    • Traditional methods often require bulky and complex sampling optics.
    • Large-diameter arrays are necessary for inter-satellite communication but pose alignment challenges.

    Purpose of the Study:

    • To develop a novel, simplified technique for coherent beam combining in a three-aperture array.
    • To enable efficient phase and tip/tilt locking for optical communication systems.
    • To reduce the complexity and size of sampling optics for large-diameter arrays.

    Main Methods:

    • A retroreflector samples beams from the edge of each aperture.
    • Sampled beams are redirected back through the central gap, carrying phase and angle information.
    • Stochastic parallel gradient descent algorithm used to maximize far-field power through a pinhole for phase-locking.

    Main Results:

    • Successful phase-locking of a three-aperture array was demonstrated.
    • The technique effectively utilizes sampled beam information for alignment.
    • Elimination of bulky sampling optics was achieved.

    Conclusions:

    • The novel retroreflector-based technique offers a simplified approach to coherent beam combining.
    • This method is particularly beneficial for large-diameter arrays in inter-satellite free-space optical communication.
    • The approach reduces optical complexity and enhances system practicality.