为了研究1.54 μm激光在不同条件下的大气传输特性,利用Modtran模型进行仿真计算的方法,得到了1.54 μm激光在大气分子、气溶胶粒子以及雨中的大气传输特性。结果表明:大气分子对1.54 μm激光的传输影响很小,基本可忽略不计;不同类型的气溶胶对于1.54 μm激光传输的衰减程度有很大差别,其中海洋环境较陆地环境衰减更为明显,且随着能见度的降低透过率也随之降低;雾对1.54 μm激光的衰减及其严重,基本很难透过;雨天对1.54 μm激光的衰减也很严重,衰减强度不及雾,但强于气溶胶,且随着降水强度的提高,透过率大幅降低。

In order to study the atmospheric transmission character of 1.54 μm laser, Modtran is used to simulate the atmospheric transmission character of 1.54 μm laser in different conditions including atmospheric molecules, aerosol and rain. The results point out that, the impact of atmospheric molecules to 1.54 μm laser is negligible. To different kinds of aerosol, the impact of transmission character of 1.54 μm laser shows considerable differences, and the decrement in maritime is heavier than that in land. The transmittance reduces with the decrease of visibility. In fog, 1.54 μm laser can hardly pass through the atmosphere. Rain also has serious impact on 1.54 μm laser, heavier than aerosol but not so serious as fog. And the transmittance will reduce heavily when precipitation intensity increases.