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Coherent combining efficiency in strongly saturated divided-pulse amplification systems.

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    Area of Science:

    • Laser physics
    • Nonlinear optics
    • High-power lasers

    Background:

    • Divided-pulse amplification (DPA) is a technique for amplifying short laser pulses to high energies.
    • Combining efficiency in DPA systems can be limited by various nonlinear effects.
    • Understanding these limitations is crucial for optimizing laser performance.

    Purpose of the Study:

    • To numerically analyze the factors limiting combining efficiency in DPA setups.
    • To evaluate the impact of nonlinear effects like self- and cross-phase modulation and saturation.
    • To provide design guidelines for scaling short pulse laser sources.

    Main Methods:

    • Numerical simulations were employed to model the DPA process.
    • The model incorporated self- and cross-phase modulation between pulse replicas.
    • Kramers-Krönig-related phase shifts and replica saturation effects were included.

    Main Results:

    • Gain saturation coupled with self-phase modulation causes pulse reshaping.
    • This reshaping imparts a temporal differential phase, decreasing combining efficiency.
    • High energy extraction per replica is limited by these saturation-induced effects.

    Conclusions:

    • Gain saturation and nonlinear phase modulation are key limitations in DPA.
    • Pulse reshaping at high energies significantly impacts combining efficiency.
    • The findings provide essential design rules for enhancing DPA-based laser systems.