Directionality of Gaussian array beams propagating in atmospheric turbulence.
Directionality of Gaussian array beams propagating in atmospheric turbulence.
复制标题
DOI：
10.1364/josaa.26.000236
复制
发表时间：
2009-02
期刊：
影响因子：
--
通讯作者：
X. Ji;Xiaoqing Li
中科院分区：
文献类型：
--
作者：
X. Ji;Xiaoqing Li
选取角展度作为光束方向性的特征参数，研究了高斯阵列光束在湍流大气中传输的方向性。高斯阵列光束的方向性表示的角度扩展和归一化的远场平均强度分布的一致性进行了检查。推导了高斯阵列光束在湍流大气中传输的均方束宽和角扩展的解析表达式。发现对于相干合成的情况，在一定条件下，存在可能具有相同方向性的阵列波束（即，相同的角展度）作为自由空间中以及湍流中的完全相干高斯激光束。然而，高斯阵列光束的方向性的角度扩展方面是不一致的，在自由空间中的归一化的远场平均强度分布方面，而它们可能是一致的湍流的结果。
The angular spread is chosen as the characteristic parameter of beam directionality, and the directionality of Gaussian array beams propagating in atmospheric turbulence is studied. The consistency of the directionality of Gaussian array beams expressed in terms of the angular spread and the normalized far-field average intensity distribution is also examined. Closed-form expressions for the mean-squared beam width and angular spread of Gaussian array beams propagating in atmospheric turbulence are derived. It is found that for the case of coherent combination, under a certain condition array beams exist that may have the same directionality (i.e., the same angular spread) as a fully coherent Gaussian laser beam in free space and also in turbulence. However, the directionality of Gaussian array beams in terms of the angular spread is not consistent with that in terms of the normalized far-field average intensity distribution in free space, whereas they may be consistent as a result of turbulence.