Enhanced forward scattering in the case of two crossed laser beams interacting with a plasma
Enhanced forward scattering in the case of two crossed laser beams interacting with a plasma
复制标题
两束交叉激光束与等离子体相互作用时前向散射增强
作者：
Labaune;Baldis;Schifano;Bauer;Maximov;Ourdev;Rozmus;Pesme
实验观察到两束完全相同的激光束在预制等离子体中传输时的大角度前向散射的非线性增强。前向散射光的光谱分析显示了两个分量，一个相对于初始激光频率没有移动，另一个红移了几埃。与单光束照明相比，交叉光束相互作用下的红移分量得到了很大的增强。二维数值模拟表明，这种增强是由于大角度前向受激布里渊散射，其中每个光束作为另一个光束的前向散射的种子。
The nonlinear enhancement of large-angle forward scattering of two identical laser beams propagating in a preformed plasma has been observed experimentally. The spectral analysis of the forward-scattered light shows two components, one which is unshifted with respect to the initial laser light frequency, and the other which is redshifted by a few angstroms. The redshifted component is found to be strongly enhanced in the case of crossed beam interaction in comparison with that of one beam illumination. Two-dimensional numerical simulations show that this enhancement is due to large-angle forward stimulated Brillouin scattering in which each beam serves as seed for the forward scattering of the other.