非圆对称高斯分布激光散斑积分光强统计分布

Statistical distribution of the integrated intensity of noncircular Gaussian laser speckle

由于某些应用中,如光学通信的误差概率计算,需要知道接收端光束强度起伏的概率分布。所以,目前对激光散斑积分光强起伏的统计分布规律的量子和经典理论的研究十分活跃,而激光大气闪烁统计分布方面的研究尤为活跃。然而,至今为止,这些研究工作皆局限于圆对称高斯分布大气散射场的闪烁分布并且忽略了接收检测有限孔径和时间累积效应。实际上,在气溶胶湍流大气(如雾、云)中传输的激光散斑的光场一般说来不再满足圆对称高斯分布。为了客观满足描述光束在实际大气中传输散斑积分光强起伏分布规律,十分必要研究描述云、雾大气中传输激光散斑光场的闪烁统计规律。本文将研究并给出非圆对称高斯分布散射场的积分光强起伏概率密度函数。

The statistical properties of the integrated intensity fluctuation of the noncir-cular Gaussian laser speckle formed by atmospheric scattering is discussed. The general formula of the probability -density function of the laser scintillations in the turbulent media and the K distribution probability-density function of the integrated intensity of the laser beam propagating in weak turbulent fluctuation region are obtained.