Abstract
Short laser pulse can be amplified and compressed via strongly coupled stimulated Brillouin scattering (sc-SBS) in plasma. But the sc-SBS amplification is subject to various deleterious instabilities. Here, we present specific analyses on the forward Raman scattering (FRS) of the seed pulse. FRS grows from noises and depletes the seed energy. It causes strong seed modulations and decoherence, which terminate the amplification. The theoretical model of sc-SBS coupled with FRS is investigated. Then, we examine the suppression effects of the density gradient and density random inhomogeneities on FRS. These effects are described well by the numerical simulations and particle-in-cell simulations.
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