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High-power lasers for directed-energy applications: comment.

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    This summary is machine-generated.

    Coherent laser beam combining is effective even with broader linewidths and atmospheric turbulence. Recent experiments show successful combining of 21 laser beams over 7 km, challenging prior conclusions.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Atmospheric Optics

    Background:

    • Prior research suggested coherent laser beam combining effectiveness is limited by narrow laser linewidths and low atmospheric turbulence.
    • These limitations were proposed to be critical for successful experiments over atmospheric paths.

    Purpose of the Study:

    • To challenge and correct inaccurate conclusions regarding the limitations of coherent laser beam combining.
    • To present evidence contradicting claims of inefficiency under typical atmospheric conditions.

    Main Methods:

    • Coherent combining of 21 laser beams.
    • Experimental transmission over a 7 km atmospheric path.
    • Utilizing lasers with a linewidth of approximately 1 GHz.

    Main Results:

    • Successful coherent combining of 21 laser beams over a 7 km atmospheric path.
    • Demonstrated effectiveness despite a 1 GHz laser linewidth.
    • Experimental results contradict previous assertions of limitations.

    Conclusions:

    • Coherent laser beam combining is effective under conditions with broader linewidths and significant atmospheric turbulence.
    • The findings are relevant to practical high-power laser systems.
    • Previous conclusions regarding inefficiency are inaccurate and not supported by recent experiments.