The success of direct laser-driven inertial confinement fusion (ICF) relies critically on the efficient coupling of laser light to plasma. At ignition scale, the absolute stimulated Raman scattering (SRS) instability can severely inhibit this coupling by redirecting and strongly depleting laser light. This article describes a new dynamic saturation regime of the absolute SRS instability near one quarter of the critical density. The saturation occurs when spatiotemporal ion-acoustic fluctuations in the plasma density detune the instability resonance. The dynamic saturation mitigates the strong depletion of laser light and enhances its transmission through the instability region, explaining the coupling of laser light to ICF targets at higher plasma densities. : …

中文翻译：

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由于自感应不相干，激光通过冠状等离子体的非线性传输

直接激光驱动的惯性约束聚变（ICF）的成功关键取决于激光与等离子体的有效耦合。在点火范围内，绝对激发拉曼散射（SRS）不稳定性可以通过重定向和强烈消耗激光来严重抑制这种耦合。本文介绍了一种接近临界密度四分之一的绝对SRS不稳定性的新动态饱和机制。当等离子体密度的时空离子声波动使不稳定性共振失谐时，就会发生饱和。动态饱和度减轻了激光的强烈消耗，并增强了其通过不稳定性区域的透射率，这说明了在较高的等离子体密度下激光与ICF目标的耦合。：…