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    Researchers developed a high-power random fiber laser (RFL) with significantly reduced spatial coherence. This breakthrough achieves record low speckle contrast, enabling advanced speckle-free imaging and communication applications.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Fiber Optics

    Background:

    • High-power lasers are crucial for various applications.
    • Random Fiber Lasers (RFLs) offer unique properties but often suffer from high spatial coherence and speckle.
    • Improving spatial coherence control in high-power RFLs is an ongoing challenge.

    Purpose of the Study:

    • To investigate a high-power multi-transverse modes random fiber laser (RFL).
    • To analyze the spatial coherence of the RFL as a function of output power.
    • To achieve record low speckle contrast in a high-power multi-transverse modes RFL.

    Main Methods:

    • Utilizing a master oscillator power-amplifier (MOPA) configuration.
    • Incorporating an extra-large mode area step-index multimode fiber (MMF).
    • Analyzing spatial coherence through speckle contrast measurements at varying output powers.

    Main Results:

    • Demonstrated a high-power multi-transverse modes RFL.
    • Observed a dramatic reduction in speckle contrast with increasing output power.
    • Achieved a record low speckle contrast of approximately 0.01 at ~56 W output power.

    Conclusions:

    • The developed RFL exhibits record-breaking low spatial coherence at high power.
    • This work presents a viable method for creating high-power RFLs with suppressed spatial coherence.
    • The findings support potential applications in speckle-free imaging and free-space optical communications.