中文摘要：

基于多光纤耦合输出半导体激光作为照明光源的主动成像系统比较了多束非相干聚焦光束和准直光束平滑光强起伏的效果,分析了两种光束受湍流引起的光束短期扩展和束心抖动的异同,为多光束照明方式提供了参考。采用相位屏近似方法模拟激光大气传输,模拟结果表明对这种主动成像系统采取准直发射方式可以有效平滑光强起伏,而聚焦发射方式则不能实现此目的。

英文摘要：

In this paper the influence of collimated beam or focused beam on averaging scintillation is compared.The difference between them on turbulence-induced beam spread and beam-center wanders is analyzed.Propagation of incoherent laser beams through atmospheric turbulence is treated with phase screen approximation.Every beam calculated independently because each two beams are not in isoplanatic angle.The intensity fluctuations estimated by σ2I.Results indicate a few incoherent collimated beams can smooth scintillation effectively but focused beams cannot in this system.The emitting method for the multi-beam system is presented.The conclusion is not universal but provide the theoretical basis for the design of multi-beam illuminating active imaging system which diode coupled by multi-optic fiber.