水平大气传输中部分相干光的光强分布及
相干特性

摘要/Abstract

摘要： 利用光束的交叉谱密度函数得到了部分相干光的光强分布和相干长度的表达式, 并基于该表达式就光源不同相干参数、不同湍流强度对部分相干光在水平大气传输中的光强分布和相干长度的影响效应进行了数值模拟, 且与完全相干光进行了比较分析。研究结果表明: 在自由空间传输过程中光强分布主要受衍射引起的展宽影响, 光源相干参数越大光束的相干长度值越大。在湍流大气中, 光源相干参数越大光强分布和相干长度受湍流大气强度变化影响越小。随着湍流强度和传输距离的增加, 光束展宽效应增加, 同时由于湍流叠加效应导致光束的相干长度下降。

关键词: 部分相干光, 大气湍流, 光强分布, 相干长度, 水平传输

Abstract: The expressions of intensity distribution and coherent length of partially coherent light are obtained by
using the cross spectral density function of the beam. Based on the expressions, the effects of different coherent
parameters of light source and different turbulence intensity on the intensity distribution and coherent length of
partially coherent light in horizontal atmosphere are numerically simulated and compared with that of completely
coherent light. The results show that, in the process of free space transmission, the light intensity distribution is
mainly affected by the broadening caused by diffraction, and the larger the coherent parameter of light source is, the
larger the coherent length of light beam is. While in the turbulent atmosphere, the larger the coherent parameters
of light source is, the smaller the influence of the intensity of turbulent atmosphere on the intensity distribution
and coherent length of light is. And with the increase of turbulence intensity and propagation distance, the beam
broadening effect increases, and the coherent length of the beam decreases at the same time due to the turbulence
superposition effect.

Key words: partially coherent light, atmospheric turbulence, intensity distribution, coherence length, horizontal propagation

中图分类号:

TN24
P425

任建迎, 孙华燕, 赵延仲, 张来线. 水平大气传输中部分相干光的光强分布及相干特性[J]. 大气与环境光学学报, 2020, 15(4): 261-268.

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