发散角对激光湍流大气传输能量密度的影响

Influence of Divergence Angle on Laser Energy Density in the Turbulent Atmosphere

实验发现,发散角为0.5mrad的激光传输10km的激光能量密度量级的估算可不考虑湍流的影响。仿真了不同发散角下的激光能量密度,发现中等湍流强度(C_n^2=10^(-14)m^(-2/3))下,发散角为mrad量级的激光能量密度量级的估算可不考虑大气湍流的影响,湍流的存在仅改变激光光强分布。发散角为μrad量级的激光能量密度的估算必须考虑大气湍流的影响,湍流的存在既改变激光光强分布,也对平均能量密度产生较大影响。考虑湍流时激光能量密度的估算可用84%环围能量密度近似。

It was shown in the experiment that to the laser of the divergence angle of 0.5mrad and the transmission distance of 10km, the infulence of the atmospheric turbulence was negligible during the evaluation of the magnitude of the energy density. The energy density of different divergence angle in the turbulent atmosphere were simulated. When the magnitude of the divergence angle was about mrad, the infulence of the atmospheric turbulence could be neglected with C2n of 10-14m-2/3 in evaluating the magnitude of the energy density. The energy distribution was changed by the turbulence.The infulence of the atmospheric tubulence must be taken into account with the divergence angle of the magnitude of μrad. Not only the energy distribution but also the average energy density were changed by the turbulence. The density of 84% of the total energy was simulated to demonstrate the infulence of the tubulence.