部分相干 cosh-Gaussian光束通过大气湍流后的聚焦特性

摘要

For studying characteristics of partially coherent cosh-Gaussian beams propagating through turbulent atmosphere , analysis was carried out based on ABCD matrix and the expressions of the intensity , beam width and power in bucket were obtained to characterize the focusing characteristics of partially coherent cosh-Gaussian beams propagating through turbulent atmosphere .The results show that under different turbulence intensities , the focusing characteristics of partially coherent cosh-Gaussian beams are different from those of totally coherent cosh-Gaussian beams and that the effect of turbulence is more serious to totally coherent cosh-Gaussian beams characterized with the power in bucket and beam width .However , the influence of turbulence on the focused partially coherent cosh-Gaussian is more serious than the collimated beams .The results are useful to study the focusability of partially coherent cosh-Gaussian beams propagating through turbulent atmosphere and helpful to design applicable optical systems for incoherent combination of paraxial beams .%为了研究部分相干双曲余弦高斯光束通过大气湍流中传输后的聚焦特性，采用了ABCD矩阵光学的方法进行分析研究，取得了光强分布、束腰半径以及桶中功率的解析式，并用于描述部分相干双曲余弦高斯光束通过大气湍流的聚焦特性。结果表明，在不同湍流强度下，部分相干双曲余弦高斯光束和双曲余弦高斯光束在经过大气湍流后有不同的聚焦特性；使用桶中功率和束腰半径作为评价参量，大气湍流对完全相干双曲余弦高斯的影响更严重；大气湍流对聚焦部分相干双曲余弦高斯光束的影响要大于准直光束。该结果对部分相干光束聚焦特性的研究有一定的理论指导意义，对合成光束傍轴聚焦系统的设计有工程指导意义。