室外100米尺度空气波导
Outdoor 100-m-scale air waveguides
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中文总结 AI 辅助
本研究首次在室外实现约100米的空气波导导波，关联其性能与多种大气条件，配套模拟揭示环境扰动影响，为复杂室外环境的准连续空气波导应用奠定基础。
中文摘要 AI 辅助
远程光谱学、遥感、定向能及自由空间光通信的光功率密度受衍射和湍流、雾、风等不利大气条件限制。由超短脉冲激光成丝产生的空气波导是长距离传输和收集光信号的有前景方案，可克服光束衍射，对点状光源还能克服信号随距离的平方反比衰减。本研究首次在室外实现了创纪录的约100米导波，超过此前42米的室内纪录。我们将空气波导性能与一系列真实大气条件关联，包括湍流折射率结构参数$C_n^2$达约$2.5\times10^{-14} m^{-2/3}$、侧风速达约2 m/s，以及温度、气压、湿度变化。配套的传播模拟揭示了这些环境扰动（尤其是侧风）对波导性能和寿命的实际影响。我们的结果为在复杂室外环境中采用kHz级重复频率成丝实现准连续空气波导铺平了道路。
英文摘要
Optical power densities for standoff spectroscopy, remote sensing, directed energy, and free-space optical communications are limited by diffraction and adverse atmospheric conditions such as turbulence, fog, and wind. Air waveguides, generated by ultrashort-pulsed laser filamentation, are a promising approach for transmission and collection of optical signals over long distances, overcoming beam diffraction and, for point-like sources, inverse square signal falloff with distance. In this work, we demonstrate outdoor guiding for the first time over a record length of ~100 m, exceeding the prior (indoor) record of 42 m. We correlate air waveguide performance to a range of real atmospheric conditions including turbulent refractive index structure parameter ($C_n^2$) values up to ~$2.5\times10^{-14} m^{-2/3}$, crosswind speeds up to ~2 m/s, as well as temperature, pressure, and humidity variations. Accompanying propagation simulations provide insight into the real effects of these environmental perturbations, particularly crosswind, on waveguide performance and lifetime. Our results pave the way for quasi-continuous air waveguiding with kHz-scale repetition rate filaments in challenging outdoor environments.
