Consistency of the directionality of partially coherent beams inturbulence expressed in terms of the angular spread and thefar-field average intensity

Consistency of the directionality of partially coherent beams inturbulence expressed in terms of the angular spread and thefar-field average intensity

Under the quadratic approximation of the Rytov＇s phase structure function, this paper derives the general closed-form expressions for the mean-squared width and the angular spread of partially coherent beams in turbulence. It finds that under a certain condition different types of partially coherent...

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Veröffentlicht in:Chinese physics B 2010 (2), p.253-259
1. Verfasser: 陈晓文 季小玲
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Sprache:eng
Schlagworte:
二次近似
大气湍流
平均强度
方向性
特征参数选择
相位结构函数
自由空间
部分相干光束
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description Under the quadratic approximation of the Rytov＇s phase structure function, this paper derives the general closed-form expressions for the mean-squared width and the angular spread of partially coherent beams in turbulence. It finds that under a certain condition different types of partially coherent beams may have the same directionality as a fully coherent Gaussian beam in free space and also in atmospheric turbulence if the angular spread is chosen as the characteristic parameter of beam directionality. On the other hand, it shows that generally, the directionality of partially coherent beams expressed in terms of the angular spread is not consistent with that in terms of the normalized far-field average intensity distribution in free space, but the consistency can be achieved due to turbulence.
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subjects 二次近似
大气湍流
平均强度
方向性
特征参数选择
相位结构函数
自由空间
部分相干光束
title Consistency of the directionality of partially coherent beams inturbulence expressed in terms of the angular spread and thefar-field average intensity
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