Guo Jiewei, Sun Lu, Liu Jinpei, Shang Binpeng, Tao Shishi, Zhang Nan, Lin Lie, Zhang Zhi
Institute of Modern Optics, Nankai University, Tianjin 300350, China.
Tianjin Key Laboratory of Micro-Scale Optical Information Science and Technology, Tianjin 300350, China.
Sensors (Basel). 2022 Jul 2;22(13):4995. doi: 10.3390/s22134995.
The filamentation process under atmospheric turbulence is critical to its remote-sensing application. The effects of turbulence intensity and location on the spatial distribution of femtosecond laser filaments in the air were studied. The experimental results show that the nonlinear effect of the filament can restrain the beam wander. When the turbulence intensity was 3.31×10−13 cm−2/3, the mean deviation of the wander of the filament center was only 27% of that of the linear transmitted beam. The change in turbulence location would lead to a change in the standard deviation of the beam centroid drift. Results also show that the filament length would be shortened, and that the filament would end up earlier in a turbulent environment. Since the filamentation-based LIDAR has been highly expected as an evolution multitrace pollutant remote-sensing technique, the study promotes our understanding of how turbulence influences filamentation and advances atmospheric remote sensing by applying a filament.
大气湍流条件下的成丝过程对其遥感应用至关重要。研究了湍流强度和位置对飞秒激光丝在空气中空间分布的影响。实验结果表明，丝的非线性效应可以抑制光束漂移。当湍流强度为3.31×10−13 cm−2/3时，丝中心漂移的平均偏差仅为线性传输光束的27%。湍流位置的变化会导致光束质心漂移标准差的变化。结果还表明，在湍流环境中，丝的长度会缩短，且终止得更早。由于基于成丝的激光雷达作为一种先进的多痕量污染物遥感技术备受期待，该研究增进了我们对湍流如何影响成丝的理解，并通过应用丝推进了大气遥感研究。
