e-p等离子体中超强激光脉冲的分裂及类多孤子结构的形成

摘要

The propagation characteristic of a linearly polarized ultra-intense laser pulse propagating in electron-positron plasmas are investigated by solving the modified nonlinear Schrödinger equation numerically. The results show that the competition of the vacuum polarization and magnetization nonlinearity and group velocity dispersion can result in the compression of an initially Gaussian laser pulse. For long pulse, the competition can split the pulse, and lead to the formation of a relatively stable multi-solitons-like structure.%通过推导并数值求解超强线极化脉冲激光在正负电子对（e-p）等离子体中传播时所满足的非线性Schrödinger方程，讨论了超强线极化脉冲激光在e-p等离子体中的传播特性。结果表明，传播过程中真空极化和磁化产生的非线性效应与群速度色散之间的竞争能导致高斯型脉冲激光的自压缩，对长脉冲，这种竞争能使脉冲在压缩后又会产生分裂，最终导致类多孤子结构的形成。