多束强激光在大气传输中的热晕与湍流效应

Thermal Blooming and Turbulence of the Multi-beam Laser Propagation in Atmosphere

摘要:

强激光在非均匀光程中传输时，大气路径中分子的吸收系数不再是常数，利用内插法得出了中纬度夏季模式的分子吸收系数随海拔高度的变化规律。强激光传输会同时受到大气湍流效应和热晕效应的共同影响，这严重影响了强激光传输的效能，而采用多束强激光传输方法可以减小这些效应的影响。根据波动光学理论，建立了三束脉冲激光在湍流和热晕相互作用下的数学模型。数值结果表明：该方法对光强起伏、光斑分裂和光束扩展等现象有较好的校正效果。

Abstract:

Considering the variety of absorption coefficient along with different altitudes in different climates, the changing rules in summer in mid-latitude region were researched by the interpolation method. The high energy laser propagating through the atmosphere will be affected by atmosphere turbulence and thermal blooming effects. The multi-beam laser transmission can be used to reduce these effects, so the model of repetitively pulsed laser under thermal blooming and turbulence was built by four-dimensional computer code based on wave optical theory. Numerical results prove the good correction effects of this method for intensity fluctuation, spot splitting and laser beam expansion.