基于大气湍流效应的双波长激光传输特性实验研究

Experimental study on transmission characteristics of dual wavelength laser in atmospheric turbulence

为研究大气湍流作用下不同波长激光信号的传输特性,建立了基于双波长条件下的激光光束传输实验测试系统,在此基础上进行了室外实验测量,得到了双波长光束同信道传输时的光束漂移和光强起伏变化的测试数据。实验结果表明,大气湍流对激光信号的传输具有较大的影响,且光强的闪烁系数与波长有很大的关系,选择波长较长的激光束可减少湍流对光强起伏的影响;光束质心漂移具有很大的随机性,且其质心变化与波长之间无明显的直接联系。实验测试数据结果与大气湍流理论相符合,对空间大气通信具有一定的参考价值。

In order to study the influence of atmospheric turbulence on the transmission characteristics of different wavelength laser,under the different weather conditions,the experiment system where the dual wavelength with the same channel can simultaneously transmit is established.And then the outside experiment is done.The test data of light beam drifting and light intensity variance changing at the dual wavelength with the same channel transmission is obtained.The result of the experiment shows that the climate influences the movement of atmospheric turbulence and transmission characteristics of laser beam in the atmospheric turbulence.Consequently,the drift of centroid is of great random and unrelated with the wave length.At the same time,the scintillation coefficient of light intensity has something to do with the wavelength and the longer wave laser light beam length may reduce the influence of atmospheric turbulence on light intensity variance.The conclusion coming from experimental data reflects well the theory of atmospheric turbulence and has certain reference value to the spatial atmospheric communication.