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首页> 外文期刊>Physical review letters >Direct Measurements of an Increased Threshold for Stimulated Brillouin Scattering with Polarization Smoothing in Ignition Hohlraum Plasmas
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Direct Measurements of an Increased Threshold for Stimulated Brillouin Scattering with Polarization Smoothing in Ignition Hohlraum Plasmas

机译:直接测量激发的血浆中极化平滑与增加的刺激布里渊散射阈值。

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摘要

We demonstrate a significant reduction of stimulated Brillouin scattering by polarization smoothing in large-scale high-temperature hohlraum plasma conditions where filamentation is measured to be negligible. The stimulated Brillouin scattering experimental threshold (defined as the intensity at which 5% of the incident light is backscattered) is measured to increase by a factor of 1.7 ± 0.2 when polarization smoothing is applied. An analytical model relevant to inertial confinement fusion plasma conditions shows that the measured reduction in backscatter with polarization smoothing results from the random spatial variation in polarization of the laser beam, not from the reduction in beam contrast.
机译:我们证明了在大规模高温高温白血球血浆条件下,极化平滑可显着减少受激布里渊散射,在这种条件下,丝化作用可以忽略不计。当应用偏振平滑时,经测量的受激布里渊散射实验阈值(定义为入射光5%的反向散射强度)增加了1.7±0.2倍。与惯性约束聚变等离子体条件有关的分析模型表明,通过偏振平滑测量的反向散射减小是由激光束偏振的随机空间变化引起的,而不是由光束对比度的减小引起的。

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