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在考虑相对论和有质动力非线性以及全局电量守衡的前提下,分析了强激光在冷等离子体窄通道中稳定传播的情况。采用较为简化的二维理论模型,给出了描述激光和通道横向结构的解,对不同通道宽度、通道密度、激光强度和电磁模式等进行了讨论,分析了其对激光在等离子体通道中传播的影响。分析发现,在存在预通道的情况下,当等离子体通道的密度大于临界密度很多时(例如20倍临界密度),即使是在激光波长量级的通道中,激光仍然可以传播。通道越宽,等离子体密度越小;激光强度越大越容易传播。在同样的通道和传输情况下,TE0模传输所需要的激光强度比TE1模要小。
Under the premise of relativistic and qualitative nonlinearity and global electricity balance, the situation of strong laser propagating in the cold plasma narrow channel was analyzed. Using a simplified two-dimensional theoretical model, the solution describing the transverse structure of the laser and the channel is given. The width, channel density, laser intensity and electromagnetic mode of different channels are discussed. The laser propagation in the plasma channel is analyzed Impact. The analysis found that in the presence of prechannels, when the plasma channel density is greater than the critical density (eg, 20 times the critical density), the laser can still propagate, even in lasers of wavelength order. The wider the channel, the smaller the plasma density; the greater the laser intensity, the easier it is to propagate. In the same channel and transmission case, TE0 mode transmission laser intensity required is smaller than the TE1 mode.