Femtosecond filament array generated in air
Femtosecond filament array generated in air
复制标题
空气中产生的飞秒灯丝阵列
DOI：
10.1007/s00340-015-6238-2
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发表时间：
2015-12-01
影响因子：
2.1
通讯作者：
Lin, Jingquan
中科院分区：
文献类型：
--
作者：
Camino, Acner;Xi, Tingting;Lin, Jingquan
利用微透镜阵列调制飞秒脉冲的空间分布和单个透镜进行功率集中，研究了飞秒脉冲在空气中的图案化多次聚焦。我们产生一个稳定的阵列的灯丝包含最大的5个热点，每平方毫米从一个温和的68-GW的输入功率。讨论了图案沿着传播轴的演变以及控制丝间间距的方法。数值模拟结果还表明，除了焦点附近的电离外，在光束轮廓中的中心热点附近还存在一个早期电离区域，之后由于激光能量的空间分布而出现一个复活区域。
Patterning multiple filamentation of femtosecond pulses in air is studied using a microlens array for modulation of the spatial profile and a single lens for power concentration. We generate a stable array of filaments containing a maximum of five hotspots per mm2from a modest 68-GW input power. The evolution of the pattern along the axis of propagation as well as the means to control the inter-filament spacing is discussed. It is also shown in numerical simulations that besides the filamentation in the proximities of the focus, there is a region of early ionization around the central hotspots in the beam profile and a revival afterwards, caused by the spatial distribution of the laser energy.