激光在含有光学元件的湍流中传输时的光束偏转

光学元件可能抑制或者加强大气湍流对激光传输性能的影响.研究了激光束在含有光学元件的湍流大气中的传输问题.根据空间滤波器原理,推导了激光束的随机偏转的解析表达式.作为一个特例,研究了高斯光束通过含有单个凸透镜的湍流大气的光束偏转,对其进行了数值计算,并与不存在光学元件时的光束漂移进行了对比.研究表明:不论光束是准直还是非准直的,光束偏转整体上都随传输距离的增加而增加,变化趋势基本一致,当传输距离相等时,存在凸透镜时的光束偏转都要小于不存在透镜时的光束漂移,激光传输性能得到改善.

Random Deflection of Laser Propagating Through Turbulence with Optical Elements

Optical elements may restrain or strengthen the influence of atmospheric turbulence on the properties of laser.Propagation of a laser beam through turbulent atmosphere with optical elements was investigated. Based on the principle of spatial filters,analytical expression for random deflection of a laser beam was deduced. Numerical calculation was given and comparisons with beam wander for the case when there is no optical elements on transmission path were made.It shows that,whether the beam is collimated or not,with the increment in transmission distance,the changing trend of beam deflection and beam wander are roughly the same and that the properties of laser can be improved by using convex lens on its propagation path in turbulent atmosphere.