利用偏振旋转减小参量后向散射
Reducing parametric backscattering by polarization rotation
摘要：
当激光穿过欠密等离子体时，拉曼和布里渊后向散射可以反射入射激光能量的大部分。这是一种主要的损耗机制，例如，在惯性约束聚变中使用激光器时。然而，通过入射线偏振的缓慢旋转，可以显著降低总反射率。粒子在细胞模拟表明，对于类似的间接驱动聚变实验的参数，偏振旋转减少反射率的一个因素的$5$。一个一般的，基于流体模型的，分析估计的反射率降低同意模拟。然而，在识别反向散射减少的来源时，难以将旋转偏振与用于设计光束偏振的基于频率分离的方法分开。尽管反向散射减少与采用频率分离的其他方法类似，但在这种情况下，强度在时间上保持恒定。
英文摘要：
When a laser passes through underdense plasmas, Raman and Brillouin Backscattering can reflect a substantial portion of the incident laser energy. This is a major loss mechanism, for example, in employing lasers in inertial confinement fusion. However, by slow rotation of the incident linear polarization, the overall reflectivity can be reduced significantly. Particle in cell simulations show that, for parameters similar to those of indirect drive fusion experiments, polarization rotation reduces the reflectivity by a factor of $5$. A general, fluid-model based, analytical estimation for the reflectivity reduction agrees with simulations. However, in identifying the source of the backscatter reduction, it is difficult to disentangle the rotating polarization from the frequency separation based approach used to engineer the beam's polarization. Although the backscatter reduction arises similarly to other approaches that employ frequency separation, in the case here, the intensity remains constant in time.
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