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    Area of Science:

    • Laser physics
    • Optical engineering
    • High-energy physics

    Background:

    • Multibeam laser systems require precise output beam balance for applications.
    • Simultaneity of laser output energy, power, and irradiance is critical.
    • The 60-beam OMEGA Laser System presents a complex balancing challenge.

    Purpose of the Study:

    • To describe the general problem of multibeam laser balancing.
    • To present specific techniques for balancing the OMEGA Laser System's output power.
    • To analyze and reduce beam-to-beam imbalance.

    Main Methods:

    • Derivation of square-pulse distortion in saturating amplifiers.
    • Development of a gain exchange method between saturated amplifiers with varying saturation fluences.
    • Application of techniques to the 60-beam OMEGA Laser System.

    Main Results:

    • Demonstrated reduction in beam-to-beam imbalance for the OMEGA Laser System.
    • Quantified square-pulse distortion effects.
    • Validated gain exchange as a method for balance adjustment.

    Conclusions:

    • The described techniques effectively address multibeam laser balancing challenges.
    • Gain exchange offers a viable method for fine-tuning laser beam balance.
    • Improved beam balance enhances the performance of large-scale laser systems like OMEGA.