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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 found experimentally that the estimation of the order of laser fluence of 10 km with a laser beam with a divergence angle of 0.5 mrad could ignore the effect of turbulence. The laser energy densities at different divergence angles were simulated and it was found that at moderate turbulence intensity (C_n ~ 2 = 10 ~ (-14) m ~ (-2/3)), the laser energy density of order mrad The estimation can ignore the influence of atmospheric turbulence, and the existence of turbulence only changes the laser intensity distribution. The estimation of the laser energy density with the divergence angle μrad must take into account the influence of atmospheric turbulence. The existence of turbulence not only changes the laser intensity distribution, but also has a great influence on the average energy density. Estimation of laser energy density considering turbulence can be approximated by 84% of the surrounding energy density.