Investigation of Atmospheric Laser Optics Test bed (A_LOT) Optical Turbulence Intensity for Free-Space Laser Communications.

摘要

In this report, we examine optical turbulence intensity measured at the U.S. Army Research Laboratory's (ARL) Atmospheric Laser Optics Test bed (A_LOT). Our goal is to better understand the physics relationships between refractive index structure and micro-climatological moments (since these can significantly affect free-space laser communications). Optical scintillometer data are collected over a nearly horizontal (2.33 km) propagation path and compared with in situ (rooftop) measurements of temperature variance. Regression analysis of time-averaged data from these different sensor systems suggests that (occasionally) optical turbulence information for an extended propagation path can be derived via point sensors, which are less costly to install and easier to maintain than scintillometer-based methods. Nevertheless, a key factor to consider is the extent of homogeneity of the optical turbulence and micro-climatological conditions along the A_LOT optical path. Additional research is recommended to further explore optical turbulence and microphysical influences on (laser) light propagation in complex areas.