大气湍流下部分相干涡旋光束经粗糙目标回波特性
Echo characteristics of partially coherent vortex beams passing through rough targets in atmospheric turbulence
吴鹏飞 1辛蕾 1王姣 2谭震坤3
作者信息
- 1. 西安理工大学自动化与信息工程学院,西安 710021
- 2. 陕西科技大学电子信息与人工智能学院,西安 710021
- 3. 西安工业大学光电工程学院,西安 710021
- 折叠
摘要
利用广义Huygens-Fresnel原理和随机高斯粗糙面模型,研究部分相干高斯-谢尔模型涡旋光束的回波特性,通过特殊积分推导出部分相干涡旋光束经随机粗糙面散射后到达接收端的交叉谱密度函数和光强解析式,并进行仿真分析.结果表明:随着拓扑荷数、束腰半径和相干长度的增加,光强自相关函数曲线下降的越来越陡峭;在强湍流环境下,自相关函数衰减越来越严重;内尺度会影响光强自相关函数,并且随着内尺度的增大而衰减严重,外尺度对其影响作用不大;随着粗糙目标相干长度的增大,光强自相关函数的半峰宽值逐渐趋增大.
Abstract
The echo characteristics of partially coherent Gaussian Schell-model vortex beams are studied by using the generalized Huygens-Fresnel principle and random Gaussian rough surface model.The cross-spectral density func-tion and intensity analytical formula of partially coherent vortex beams scattered by random rough surface are derived by special integral,and the simulation analysis is carried out.The results show that the intensity autocorrelation function curve decreases more and more steeply with the increase of topological charge,beam waist radius and coherence length.In strong turbulence environment,the attenuation of autocorrelation function is more and more serious.The in-ner scale will affect the autocorrelation function of light intensity,and it will decay seriously with the increase of the in-ner scale,while the outer scale has little effect on it.As the coherence length of the rough target increases,the half-peak width of the intensity autocorrelation function gradually increases.
关键词
光通信/大气湍流/随机高斯粗糙目标/交叉谱密度函数/散斑Key words
optical communications/atmospheric turbulence/random rough surface targets of gaussian/cross spectral density function/speckle引用本文复制引用
基金项目
国家自然科学基金(62001363)
国家自然科学基金(62101313)
陕西省科技成果转移与推广计划(2020CGXNG-041)
陕西省教育厅服务地方专项(20JC027)
陕西省重点研发计划工业领域一般项目(2022GY-100)
陕西省科协青年人才支持项目(20220142)
出版年
2024
NETL
NSTL
万方数据