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Coherent beam combining using a 2D internally sensed optical phased array.

Lyle E Roberts, Robert L Ward, Andrew J Sutton

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    Researchers developed a novel internally sensed optical phased array (OPA) for coherent laser combination. This technology achieves high fringe visibility and phase stability, enabling scalable optical intensity for advanced laser applications.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Interferometry

    Background:

    • Scaling optical intensity is crucial for advanced laser applications.
    • Traditional methods using single fiber lasers have limitations.
    • Optical phased arrays (OPAs) offer a path to higher intensities through coherent combination.

    Purpose of the Study:

    • To present a new internally sensed 2D OPA architecture.
    • To demonstrate robust and scalable coherent laser combination.
    • To improve the stability and intensity of combined laser beams.

    Main Methods:

    • Utilized a modified digitally enhanced heterodyne interferometry (DEHI) technique with code division multiplexing.
    • Implemented an internally sensed architecture with no free-space components.
    • Employed electro-optic modulators for independent control of three laser emitters.

    Main Results:

    • Achieved over 95% fringe visibility of the interfered beam.
    • Demonstrated λ/120 RMS output phase stability over a 5 Hz bandwidth.
    • Showcased quadratic scaling of far-field intensity with three emitters.

    Conclusions:

    • The internally sensed OPA architecture provides a robust solution for coherent laser combination.
    • This approach enhances stability and scalability compared to existing methods.
    • The DEHI-based sensing offers improved performance for all-fiber laser systems.