部分相干厄米-双曲正弦-高斯光束通过湍流大气传输的平均光强分布演化和角扩展  

Evolution of average intensity distribution and angular spread of partially coherent Hermite-sinh-Gaussian beams propagating through turbulent atmosphere

作　　者：李晋红[1] 杨爱林[1] 吕百达[1] 

机构地区：[1]四川大学激光物理与化学研究所,成都610064

出　　处：《物理学报》2009年第1期674-683,共10页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10574097;10874125)资助的课题~~

摘　　要：推导出部分相干厄米-双曲正弦-高斯(H-ShG)光束通过湍流大气的平均光强和角扩展的解析表示式,并用以研究了部分相干H-ShG光束在湍流中的平均光强分布演化和角扩展.结果表明,折射率结构常数C2n的增加和空间相关长度σ0的减小都会加速演化过程.引入相对角扩展来定量描述光束抗拒湍流的能力.空间相关长度σ0,束腰宽度w0和双曲正弦部分参数Ω0越小,光束阶数m,n越大,部分相干H-ShG光束的角扩展受湍流的影响越小.The analytical expressions for the average intensity and angular spread of partially coherent Hermite-sinh-Gaussian（H-ShG） beams propagating through turbulent atmosphere are derived and used to study the evolution of average intensity distribution and angular spread of partially coherent H-ShG beams in turbulence.It is shown that an increase of the refraction index structure constant C2_n and a decrease of the spatial correlation length σ_0 accelerate the evolution process.The relative angular spread is introduced to quantitatively describe the resistance of a beam to turbulence.The smaller the spatial correlation length σ_0,the waist width w_0,the Sh-part parameter Ω_0,and the larger the beam orders m,n,the less the angular spread of partially coherent H-ShG beams is affected by turbulence.

关 键 词：平均光强分布演化 角扩展 湍流大气 部分相干厄米-双曲正弦-高斯(H-ShG)光束 

分 类 号：O436[机械工程—光学工程]