强激光在多组份等离子体中传播的折射率

Refractive index of strong laser propagating in multi-component plasma

真空在强电磁场作用下会被极化,成为一种非线性的电磁介质,因此在激光与等离子体相互作用中应该考虑真空极化效应。从包含真空极化修正的电磁场的有效拉格朗日密度出发,推导得到了强激光在包含电子、正电子和离子的多组份等离子体介质中传播的色散关系和折射率,并分析了真空极化效应和等离子体的组份对折射率的影响。

Vacuum is polarized in strong electromagnetic field and becomes a nonlinear electromagnetic medium.Therefore,vacuum polarization effect should be considered in the interaction between laser and plasma.This paper starts from the effective Lagrangian density of electromagnetic fields including vacuum polarization correction.The refractive index of a plasma containing electrons,positrons and ions is derived when a laser propagates in the plasma.Besides,the effects of the vacuum polarization and the components of the plasma on the refractive index are analyzed.