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Stimulated Raman and Brillouin scattering of polarization-smoothed and temporally smoothed laser beams

机译:偏振平滑和时间平滑激光束的受激拉曼和布里渊散射

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摘要

Control of filamentation and stimulated Raman and Brillouin scattering is shown to be possible by use of both spatial and temporal smoothing schemes. The spatial smoothing is accomplished by the use of phase plates [Y. Kato and K. Mima, Appl. Phys. 329, 186 (1982)] and polarization smoothing [Lefebvre et al., Phys. Plasmas 5, 2701 (1998)] in which the plasma is irradiated with two orthogonally polarized, uncorrelated speckle patterns. The temporal smoothing considered here is smoothing by spectral dispersion [Skupsky et al., J. Appl. Phys. 66, 3456 (1989)] in which the speckle pattern changes on the laser coherence time scale. At the high instability gains relevant to laser fusion experiments, the effect of smoothing must include the competition among all three instabilities. (C) 1999 American Institute of Physics. [S1070-664X(99)02804-9]. [References: 17]
机译:通过同时使用空间和时间平滑方案,可以控制细丝化和刺激的拉曼和布里渊散射。空间平滑是通过使用相位板[Y.加藤和K.Mima,应用。物理329,186(1982)]和极化平滑[Lefebvre et al。,Phys。 Plasmas 5,2701(1998)],其中以两个正交极化,不相关的斑点图案照射等离子体。这里考虑的时间平滑是通过频谱色散进行平滑[Skupsky et al。,J. Appl。物理66,3456(1989)],其中斑点图案在激光相干时间尺度上变化。在与激光融合实验相关的高度不稳定性增益下,平滑效果必须包括所有三个不稳定性之间的竞争。 (C)1999美国物理研究所。 [S1070-664X(99)02804-9]。 [参考:17]

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