强湍流中的空气光波导
Optical air waveguides in strong turbulence
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- Los Alamos National Laboratory（洛斯阿拉莫斯国家实验室）
- Institute for Research in Electronics and Applied Physics, University of Maryland（马里兰大学电子与应用物理研究所）
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中文总结 AI 辅助
本研究针对丝化空气光波导在大气湍流中的可行性问题，通过实验和模拟突破了其湍流极限数个数量级，明确了湍流的两个关键限制，证明其可在近地面强湍流下用于千米级光传输。
中文摘要 AI 辅助
丝化产生的空气光波导为低损耗长距离光传输提供了途径，但它们在大气湍流中的可行性仍不确定。本文通过实验和模拟证明，空气光波导中的导光可在折射率结构参数C_n^2上突破此前估计的湍流极限数个数量级；沿传播路径，远大于波导折射率对比度的湍流折射率波动会被平均抵消。相反，湍流施加了两个不同的限制：导场超出波导接收孔径的散射，以及在大气强度下更重要的、形成波导的光束的闪烁。经实验验证的模型缩放表明，丝化产生的空气光波导在近地面强湍流下仍可在千米级路径上保持可行性。本研究确定了大气中远程光引导的湍流极限。
英文摘要
Filament-generated air waveguides offer a route to low loss long-distance optical transport, but their viability in atmospheric turbulence has remained uncertain. Here, we demonstrate with experiments and simulations that guided beams in air waveguides can overcome prior estimated turbulence limits by orders of magnitude in the refractive index structure parameter C_n^2; turbulent index fluctuations much larger than the waveguide index contrast average out along the propagation path. Instead, turbulence imposes two distinct limits: scattering of the guided field beyond the waveguide acceptance aperture and, more importantly at atmospheric strengths, scintillation of the waveguide-forming beam. Scaling of experimentally validated models indicates that filament-generated air waveguides remain viable over kilometer-scale paths under strong near-ground turbulence. Our results establish turbulence limits for long-range optical guiding in the atmosphere.
