部分相干光在大气湍流中的到达角起伏

Arrival Angle Fluctuations of Partially Coherent Beams in the Atmospheric Turbulence

研究了部分相干高斯谢尔光束在大气湍流中的到达角起伏.主要采用湍流内外尺度的修正Von Karmon谱模型及广义惠更斯-菲涅尔原理和交叉谱密度函数推导出了部分相干光在大气湍流中的到达角起伏表达式.对比分析了湍流内外尺度、湍流强度、传输距离、源相干参数以及波长等参数对部分相干光在大气湍流水平路径上传输时的到达角起伏的影响.结果表明:随着传输距离的增加,到达角起伏越来越小;随着大气湍流内外尺度和源相干参数的增加,到达角起伏也越来越大;与部分相干光相比,完全相干光的到达角起伏受湍流影响很小;随着波长和湍流强度的减小,到达角起伏越来越小.

Arrival angle fluctuations of partially coherent beams have been studied in the atmospheric turbulence. Using the model of modified Von Karmon spectrum considering its inner-scale and outerscale, generalized huygens-fresnel principle and cross-spectrum density function, the expressions of arrival angle fluctuations of partially coherent beams have been deduced in the atmospheric turbulence. The influence to arrival angle fluctuations of partially coherent beam, on the turbulence along a horizontal path have been analyzed in different turbulence scales, different turbulence intensity, different transmission distance, different source coherence parameters and different wavelength. The result shows that with the increase of transmission distance, arrival angle fluctuation is more and more small;with the increase of atmospheric turbulence scale and source coherent parameters, arrival angle fluctuation is bigger and bigger; compared with the partially coherent beam, the influence of the arrival angle fluctuation of the completely coherent beams turbulence is very small;with the decrease of the wavelength and intensity of turbulence, arrival angle fluctuation is more and more small.