应用物理

Vol.3 No.3 (May 2013)

部分相干厄米–高斯光束通过非Kolmogorov大气湍流传输的束宽扩展和方向性
The Beam-Width Spread and Directionality of Partially Coherent Hermite-Ganssian Beams Propagating through Non-Kolmogorov Atmospheric Turbulence*

 

作者:

彭艳艳 , 李晋红 , 魏计林 , 王伟伟 :太原科技大学应用科学学院,太原

 

关键词:

部分相干厄米–高斯光束非Kolmogorov大气湍流束宽扩展方向性 Partially Coherent Hermite-Gaussion Beam Non-Kolmogorov Atmospheric Turbulence Beam-Width Spreading Directionality

 

摘要:

基于广义惠更斯–菲涅耳原理和非Kolmogorov谱,推导出了部分相干厄米–高斯(H-G)光束通过非Kolmogorov大气湍流传输中束宽扩展的解析表达式,并用以研究了部分相干H-G光束通过大气湍流的束宽扩展和方向性。引入相对束宽来定量的描述光束抗拒大气湍流的能力。结果表明,空间相干长度σ0越小,光束阶束m,n越大,部分相干H-G光束的束宽扩展受大气湍流影响越小;而束腰宽度ω0受大气湍流影响与传输距离z有关,当传输距离足够远时,束腰宽度ω0越小,部分相干H-G光束的束宽扩展受大气湍流影响越小。部分相干H-G光束相对束宽随Kolmogorov大气湍流广义指数参量α增加先增加后减小。另外,存在等价部分相干H-G光束、等价完全相干H-G光束、等价高斯–谢尔模型(GSM)光束与相应的完全相干高斯光束在非Kolmogorov大气湍流和自由空间中分别具有相同的方向性,并对所得结果做了物理解释。

Based on the extended Huygens-Fresnel principle and non-Kolmogorov spectrum, analytical expressions for the beam-width spread of partially coherent Hermite-Ganssian (H-G) beams propagating through non-Kolmogorov atmospheric turbulence are derived, and used to study the beam-width spreading and directionality of partially coherent H-G beams propagating through non-Kolmogorov atmospheric turbulence. The relative width is introduced to quantitatively describe the resistance of a beam to atmospheric turbulence. It is shown that the smaller the spatial correlation length σ0, and the larger the beam order m, n, and the less the beam-width spreading of partially coherent H-G beams is affected by non-Kolmogorov atmospheric turbulence. The influence of turbulence on beam-width spreading depends on the waist width ω0 and propagation distance z, when the propagation distance is sufficiently long, the smaller the waist width ω0, the less the beam-width spreading of partially coherent H-G beams is affected by non-Kolmogorov atmospheric turbulence. The beam width of partially coherent H-G beams through non-Kolmogorov atmospheric turbulence increase with the increasing exponent parameter α, then decrease with increasing α. There exist equivalent partially coherent and fully coherent H-G beams, GSM beams, which have the same directionality as a fully coherent Gaussian laser beam in free space and in non-Kolmogorov atmospheric turbulence. The results are interpreted physically.


文章引用:

彭艳艳 , 李晋红 , 魏计林 , 王伟伟 (2013) 部分相干厄米–高斯光束通过非Kolmogorov大气湍流传输的束宽扩展和方向性。 应用物理, 3, 61-67. doi: 10.12677/APP.2013.33012

 

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