各向异性非Kolmogorov海面大气湍流传输高斯光束扩展定标规律  

Beam Spreading Scaling Law of Gaussian Beam Propagating in Anisotropic Non-Kolmogorov Maritime Atmospheric Turbulence

作　　者：胡瀚引 杨博文 钟哲强[1] 张彬[1] HU Hanyin;YANG Bowen;ZHONG Zheqiang;ZHANG Bin(College of Electronics and Information Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学电子信息学院,成都610065

出　　处：《光子学报》2025年第1期104-114,共11页Acta Photonica Sinica

基　　金：中国科学院自适应光学重点实验室基金(No.LAOF1801)。

摘　　要：为快速预测和评估海面大气湍流对高斯光束扩展的影响及规律,研究高斯光束在各向异性非Kolmogorov海面大气湍流传输的光束扩展定标规律。利用功率谱反演法生成海面大气湍流相位屏,数值计算了光束扩展随大气各向异性因子、光谱幂指数、激光初始光束质量和波长等参数的变化规律,建立了海面大气湍流传输的光束扩展定标关系。在海面大气非Kolmogorov谱基础上引入各向异性因子,更加全面地描述海面大气湍流的影响及规律。针对定标公式,进一步引入幂律和各向异性因子,以更全面地预估不同情况海面环境下的光束扩展规律。结果表明,在激光波长λ取值范围为0.4μm~3.5μm、初始光束质量因子β0取值范围为1.0~3.0、广义折射率结构常数C_(n)^(2)取值范围为5×10^(-16)~5×10^(-13)m^(3)-α、大气各向异性因子?取值范围为1~4、光谱幂指数α取值范围为3.1~3.8时,根据建立的定标关系式所预估的光束扩展规律与数值计算结果误差在15%以内。In recent years,the propagation characteristics of Gaussian beams in anisotropic non-Kolmogorov maritime atmospheric turbulence have attracted significant attention.However,beam spreading is inevitable upon propagation,leading to the decrease of beam quality of Gaussian beams in far field.The analysis of beam spreading of Gaussian beams,using the power spectrum inversion and the multi-layer phase screen method,is quite time-consuming and challenging to efficiently address the rapid and accurate prediction of beam spreading in practical applications.Although many researches have been focused on the propagation characteristics of Gaussian beams in maritime atmospheric turbulence,the scaling law for beam spreading is still lacking.Especially,compared to terrestrial environments,the maritime environment exhibits distinct characteristics,including higher humidity levels and temperature variations.These environmental differences lead to variations in the propagation characteristics of Gaussian beams.Consequently,establishing scaling law is essential for predicting the beam spreading of Gaussian beams in maritime atmospheric turbulence.To effectively predict and evaluate the impact of maritime atmospheric turbulence on the beam spreading,this study investigates the scaling law for beam spreading of Gaussian beams in maritime atmospheric conditions.A comprehensive physical model has been developed to characterize maritime turbulence using the power spectrum inversion method to generate the turbulence phase screen.Subsequently,numerical simulations have been carried out by the use of the multi-layer phase screen method.Based on the Kolmogorov turbulence spectrum and taking into account the atmospheric coherence length for non-Kolmogorov scenarios,the scaling law for beam spreading of Gaussian beams in maritime atmospheric turbulence has been established.The effects of key parameters,including atmospheric anisotropy,spectral power index,initial beam quality,and wavelength,on the beam spreading of Gaussian beams propagating

关 键 词：湍流 各项异性 非Kolmogorov 定标 海面大气 

分 类 号：TN012[电子电信—物理电子学]