论文部分内容阅读
在对超短超强激光与等离子体相互作用进行粒子模拟诊断的研究中 ,输出量普遍为时间或空间上的非平稳信号。将时频分布技术引入粒子模拟结果的诊断 ,指出用时频分布技术等现代信号处理技术诊断模拟结果中的非平稳信号具有重要意义。作为实例 ,考察了用线性啁啾激光打靶条件下 ,包含 nc/ 4 (nc为等离子体临界密度 )的非均匀等离子体区域中的受激拉曼散射的演化 ,并用时频分布技术得到了清晰的物理图像。
In the study of particle simulation of ultrashort superlattice laser-plasma interaction, the output is generally non-stationary signal in time or space. The time-frequency distribution technology is introduced into the diagnosis of particle simulation results. It is pointed out that it is of great significance to diagnose the non-stationary signals by modern signal processing techniques such as time-frequency distribution technology. As an example, the evolution of stimulated Raman scattering in a non-uniform plasma region containing nc / 4 (nc is the plasma critical density) under linear chirped laser targeting was investigated and time-frequency distribution techniques were employed The physical image.