本文对激光等离子体细丝的场分布和共振吸收进行了理论研究.在冷等离子体的条件下,首先求得场方程以及电场的径向分量和轴向分量的解析表示式;然后,通过数值计算发现:在等离子体细丝的径向场存在一个隧道效应,即在径向共振点r_o附近,场出现极大值.

In this paper,we have theoretically studied the field distributions and resonance absorption in a laser plasma filament. Under the condition of cold plasma, the field equation, as well as its analytical solutions to the radial and axial components of the electric field, is derived. By the numerical calculations, it is then found that at tunnel effect exists along the radial direction in a filamentation plasma, i.e., the field reaches a maximum near the radial resonance absorption point r0.