相位不连续点数与湍流效应特征参数的关系

Relationship Between the Number of Branch Points and the Characteristic Parameters of Turbulence Effect

利用激光大气传输四维程序对激光在大气中传输时产生的相位不连续点的数目进行了数值计算。计算结果表明,相位不连续点的数目不仅与描述光强起伏量的大气湍流强度、传输路径长度和传输光的波长有关,而且还与湍流的内尺度有关。另外,通过对湍流较弱但传输路径较长的强闪烁条件下畸变光场中出现的相位不连续点数目的计算发现,当湍流效应达到一定程度时,相位不连续点的数目有达到饱和的趋势。

The behsvior of branch point numbers was computed by four-dimension code of laser propagation in atmosphere. Various turbulence conditions, ranging from weak to strong, are considered as well as the dependence on turbulence strength, propagation length, wavelength, and the inner scales of turbulence are presented. The computational results of strong scintillation with weak turbulence but long propagation length indicate that the number of branch points in distorted optical field has a tendency to saturation.