部分相干双曲余弦高斯光束通过湍流大气传输空间相干性的变化  

Changes in the spatial correlation properties of partially coherent cosh-Gaussian beams propagating in atmospheric turbulence

作　　者：汤明玥[1] 陈晓文[1] 陈虹[1] 

机构地区：[1]川北医学院基础医学院,四川南充637000

出　　处：《重庆文理学院学报（自然科学版）》2010年第4期20-23,共4页Journal of Chongqing University of Arts and Sciences

基　　金：川北医学院苗圃基金(08-10)

摘　　要：基于广义惠更斯—菲涅尔原理,推导出了部分相干双曲余弦高斯光束通过湍流大气传输其光谱相干度的解析表达式,并研究了光束的空间相干特性.研究表明,部分相干双曲余弦高斯光束通过自由空间传输其光谱相干度会出现振荡和相位奇异现象,且震荡随光束离心参数δ增大而增强.但是,随着湍流的增强,不同δ的光谱相干度曲线相接近,并呈类高斯分布;此外,在湍流中随着传输距离z的增加光束的空间相干性变差.Based on the extended Huygens-Fresnel principle,the analytical expression for the spectral degree of coherence of partially coherent cosh-Gaussian beams propagating in atmospheric turbulence is derived.It is shown that the oscillatory behavior and phase singularities of the spectral degree of coherence may appear when partially coherent cosh-Gaussian beams propagate in free space.The curves of the spectral degree of coherence of partially coherent cosh-Gaussian beams with different values of δ are close to each other and turn into Gaussian-like profile with increasing turbulence.In addition,the spatial correlation becomes worse with increasing z due to turbulence.

关 键 词：部分相干双曲余弦高斯光束 湍流大气 光谱相干度 

分 类 号：O435[机械工程—光学工程]