论文部分内容阅读
大气湍流效应是制约各种激光工程应用的重要因素之一。采用多层相位屏的模拟方法,针对地空激光大气的长距离斜程传输进行了大量数值模拟,通过变化天顶角、光束初始半径和激光波长等传输条件,定量分析了光束的有效半径、相对真空扩展倍数、光斑质心漂移均方根和63.2%环围能量的平均功率密度等统计参量在不同传输条件下受湍流的影响程度和变化规律。结果表明:天顶角越大,湍流效应越强,光束受到湍流的影响越大;波长越短,光束受到湍流的影响越强;光斑的漂移随光束初始半径的增大而减小,且与波长无关;在湍流效应和衍射效应的综合作用下,光束有效半径和63.2%环围能量的功率密度随波长和光束初始半径均不是单调变化。这可为激光工程应用提供一定的理论分析和性能预测依据。
Atmospheric turbulence is one of the most important factors restricting the application of various laser projects. A large number of numerical simulations have been carried out for the simulation of long-distance slant range propagation in the air-to-ground laser atmosphere using a multi-layer phase-plate simulation method. By changing the transmission conditions such as zenith angle, initial beam radius and laser wavelength, the effective radius, Relative expansion factor of vacuum, root mean square of spot center of mass shift and average power density of 63.2% surrounding energy, etc. Under different transmission conditions. The results show that the larger the zenith angle is, the stronger the turbulence effect is and the more the turbulence will affect the beam. The shorter the wavelength is, the stronger the turbulence will be. The drift of the spot decreases with the initial radius of the beam Wavelength has nothing to do. Under the combined effect of turbulence effect and diffraction effect, both the effective radius of the beam and the power density of 63.2% of the surrounding energy do not monotonically change with the wavelength and the initial radius of the beam. This can provide some theoretical analysis and performance prediction basis for laser engineering applications.