论文标题
光学指导在50米尺度的空气波导中
Optical guiding in 50-meter-scale air waveguides
论文作者
论文摘要
大气中高峰值和平均功率激光束的遥远投影是一个长期的目标，具有广泛的应用。我们的早期原理证明实验[物理学。 Rev. X 4，011027（2014）]提出了一个解决方案，该解决方案采用空中飞秒丝的能量沉积来雕刻毫秒终身长度空波指导。在这里，我们演示了50米尺度的空气波长60倍，这使得许多实际应用现在成为可能。我们采用一种新方法来进行灯丝能量沉积：Laguerre-Gaussian LG01“甜甜圈”模式的多丝。我们首先在较短的8 m内传播范围内研究了该方案的详细物理学，对应于〜13雷利长度的引导脉冲。然后，我们使用这些结果来证明与实验室相邻的走廊中约45 m的光学指南，对应于〜70雷利长度。将连续的波探针束注射到这些波导中表明数十毫秒的寿命很长。
The distant projection of high peak and average power laser beams in the atmosphere is a longstanding goal with a wide range of applications. Our early proof-of-principle experiments [Phys. Rev. X 4, 011027 (2014)] presented one solution to this problem, employing the energy deposition of femtosecond filaments in air to sculpt millisecond lifetime sub-meter length air waveguides. Here, we demonstrate air waveguiding at the 50 meter scale, 60X longer, making many practical applications now possible. We employ a new method for filament energy deposition: multi-filamentation of Laguerre-Gaussian LG01 "donut" modes. We first investigate the detailed physics of this scheme over a shorter 8 m in-lab propagation range corresponding to ~13 Rayleigh lengths of the guided pulse. We then use these results to demonstrate optical guiding over ~45 m in the hallway adjacent to the lab, corresponding to ~70 Rayleigh lengths. Injection of a continuous wave probe beam into these waveguides demonstrates very long lifetimes of tens of milliseconds.
