Modeling a femtosecond filament array waveguide for guiding pulsed infrared laser radiation
Modeling a femtosecond filament array waveguide for guiding pulsed infrared laser radiation
复制标题
模拟用于引导脉冲红外激光辐射的飞秒灯丝阵列波导
DOI：
10.1016/j.optcom.2012.12.067
复制
发表时间：
2013-06-01
影响因子：
2.4
通讯作者：
Lin, Jingquan
中科院分区：
文献类型：
--
作者：
Alshershby, Mostafa;Hao, Zuoqiang;Lin, Jingquan
一个中空的圆柱形等离子体波导，其中包层由大量的混沌分布的等离子体丝诱导的飞秒（fs）激光脉冲在空气中的传播，示出支持脉冲红外（IR）激光辐射的导模。考虑到波导包层的不连续性和有限性，计算了不同空间位形下激光辐射的损耗系数。我们报告波导损耗如何取决于其结构参数，如归一化等离子体直径，灯丝之间的距离，芯半径，包层的厚度，和灯丝的电子密度。对于典型的等离子体参数，fs等离子体波导的损耗被发现是低于自由传播的红外激光束的距离的顺序的折射长度。这一事实允许在大气中长距离传递准直脉冲激光，这对于基于光学的遥感和化学和生物制剂的检测是必要的。(C)2013爱思唯尔有限公司版权所有。
A hollow cylindrical plasma waveguide, which cladding consists of a large number of a chaotically distributed plasma filaments induced by the propagation of femtosecond (fs) laser pulses in air, is shown to support guided modes of pulsed infrared (IR) laser radiation. Taking into account the discontinuity and the finiteness of the waveguide cladding, the loss coefficient loss of the laser radiation is calculated for different spatial configurations. We report how the waveguide loss depends on its structural parameters like normalized plasma diameter, distance between filaments, core-radius, cladding's thickness, and filaments' electron density. For typical plasma parameters, the loss of the fs plasma waveguide is found to be lower than that of freely propagating IR laser beams to distances in the order of the filamentation length. This fact allows the delivery of collimated pulsed laser light over long distances in atmospheric air, which is necessary for optical-based remote sensing and the detection of chemical and biological agents. (C) 2013 Elsevier B.V. All rights reserved.