Nelson Charles, Avramov-Zamurovic Svetlana, Korotkova Olga, Malek-Madani Reza, Sova Raymond, Davidson Frederic
Appl Opt. 2013 Nov 1;52(31):7449-61. doi: 10.1364/AO.52.007449.
Irradiance fluctuations of an infrared laser beam from a shore-to-ship data link ranging from 5.1 to 17.8 km are compared to lognormal (LN), gamma-gamma (GG) with aperture averaging, and gamma-Laguerre (GL) distributions. From our data analysis, the LN and GG probability density function (PDF) models were generally in good agreement in near-weak to moderate fluctuations. This was also true in moderate to strong fluctuations when the spatial coherence radius was smaller than the detector aperture size, with the exception of the 2.54 cm power-in-bucket (PIB) where the LN PDF model fit best. For moderate to strong fluctuations, the GG PDF model tended to outperform the LN PDF model when the spatial coherence radius was greater than the detector aperture size. Additionally, the GL PDF model had the best or next to best overall fit in all cases with the exception of the 2.54 cm PIB where the scintillation index was highest. The GL PDF model also appears to be robust for off-of-beam center laser beam applications.
将距离为5.1至17.8千米的岸对船数据链路中红外激光束的辐照度波动与对数正态（LN）分布、带孔径平均的伽马-伽马（GG）分布以及伽马-拉盖尔（GL）分布进行了比较。通过数据分析，LN和GG概率密度函数（PDF）模型在近弱到中等波动情况下总体吻合良好。当空间相干半径小于探测器孔径尺寸时，在中等至强波动情况下也是如此，但2.54厘米桶中功率（PIB）情况除外，此时LN PDF模型拟合最佳。对于中等至强波动，当空间相干半径大于探测器孔径尺寸时，GG PDF模型往往优于LN PDF模型。此外，除了闪烁指数最高的2.54厘米PIB情况外，GL PDF模型在所有情况下总体拟合最佳或接近最佳。GL PDF模型对于离光束中心的激光束应用似乎也很稳健。
