窄金属毛细管中波导模式的衰减
Attenuation of waveguide modes in narrow metal capillaries
摘要：
激光脉冲在填充稀有等离子体的波导中的沟道效应是激光尾波场加速的一种很有前途的技术。固态毛细管可以精确地引导紧密聚焦的脉冲。无论毛细管的材料如何，其壁在高强度激光脉冲的影响下表现得像等离子体。因此，毛细管中的波导模式具有通用结构，其仅取决于横截面的形状。由于毛细管半径与激光波长的比值很大，圆形毛细管中的模式不同于经典的TE和TM模式。这种模式的衰减长度是两个数量级以上的经典公式得到的，和适当半径的入射脉冲可以转移高达98%的初始能量的基模。然而，在任意截面的毛细管中寻找本征模是一个复杂的数学问题，仍然有待解决。
英文摘要：
The channeling of laser pulses in waveguides filled with a rare plasma is one of promising techniques of laser wakefield acceleration. A solid-state capillary can precisely guide tightly focused pulses. Regardless of the material of the capillary, its walls behave like a plasma under the influence of a high-intensity laser pulse. Therefore, the waveguide modes in the capillaries have a universal structure, which depends only on the shape of the cross-section. Due to the large ratio of the capillary radius to the laser wavelength, the modes in circular capillaries differ from the classical TE and TM modes. The attenuation length for such modes is two orders of magnitude longer than that obtained from the classical formula, and the incident pulse of the proper radius can transfer up to 98% of its initial energy to the fundamental mode. However, finding eigenmodes in capillaries of arbitrary cross-section is a complex mathematical problem that remains to be solved.
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