多束部分相干光通过强湍流对光强闪烁的影响

在Rytov方差的基础上,利用Andrews的唯像闪烁模型,推导出部分相干光通过强大气湍流后其对数光强起伏方差的公式,并用此公式对部分相干光通过强湍流后给光强闪烁造成的影响进行了仿真。其结果表明,当光源的相干性变差,即变为部分相干光后,对数光强起伏方差变小;当采用多束部分相干光时,接收面上光强起伏方差得到明显改善,而且光束越多,改善越明显。

Influence of multiple partially coherent beams through strong turbulence on light intensity scintillation

An expression for logarithmic light intensity fluctuation variance of partially coherent light passing through atmospheric turbulence is derived by using Andrews scintillation model on the basis of Rytov variance. The results show that logarithmic light intensity fluctuation variance will be less when light source coherence becomes worse, i.e. it becomes into partially coherent light. When multiple partially coherent beams are applied, the light intensity fluctuation variance on the receiving plane will be improved obviously. The more the beams exist, the more obvious the improvement will be.