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Nonlinear FM-AM conversion due to stimulated Brillouin scattering.

J Luce, S Montant, J M Sajer

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    Stimulated Brillouin scattering (SBS) can harm regenerative amplifiers. Careful selection of modulation frequencies can prevent this self-seeding effect and mitigate detrimental amplitude modulation in laser systems.

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    Area of Science:

    • Laser Physics
    • Nonlinear Optics

    Background:

    • High-energy laser facilities often use phase-modulated pulses to mitigate transverse stimulated Brillouin scattering (SBS) and improve focal spot smoothing.
    • Phase-modulated pulses can undergo detrimental frequency modulation to amplitude modulation (FM-AM) conversion due to spectral distortions.

    Purpose of the Study:

    • To investigate the potential for SBS generation within regenerative amplifiers.
    • To understand the mechanism of self-seeded SBS in regenerative amplifiers and its impact on pulse characteristics.

    Main Methods:

    • Experimental observation of SBS in a regenerative amplifier.
    • Numerical simulations to model the SBS process and FM-AM conversion.

    Main Results:

    • Demonstrated that SBS can be self-seeded in regenerative amplifiers when specific spectral conditions are met.
    • Identified that reflected sidebands can act as seeds for SBS, leading to nonlinear amplitude modulation.
    • Showed that SBS-induced amplitude modulation can negatively impact downstream propagation.

    Conclusions:

    • Regenerative amplifiers are susceptible to self-seeded SBS, posing a risk to laser system performance.
    • Strategic selection of modulation frequencies can effectively suppress SBS and prevent detrimental FM-AM conversion.
    • Mitigation of SBS in regenerative amplifiers is crucial for maintaining pulse integrity in high-energy laser systems.