Spreading of partially coherent Hermite–Gaussian beams through a non-Kolmogorov turbulence
Spreading of partially coherent Hermite–Gaussian beams through a non-Kolmogorov turbulence
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DOI：
10.1016/j.ijleo.2010.12.027
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发表时间：
2011-11
期刊：
影响因子：
3.1
通讯作者：
Guohua Wu;Bin Luo;Song Yu;A. Dang;Tonggang Zhao;Hong Guo
中科院分区：
文献类型：
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作者：
Guohua Wu;Bin Luo;Song Yu;A. Dang;Tonggang Zhao;Hong Guo
基于推广的惠更斯-菲涅耳原理，推导了部分相干厄米-高斯光束通过非柯尔莫哥洛夫湍流时束宽的解析表达式。详细研究了内尺度L0、外尺度L0、指数值α、光束阶数m和光源空间相干度对PCHG光束通过非Kolmogorov湍流扩展的影响。结果表明，较小的内尺度L0和较大的外尺度L0使PCHG光束通过非Kolmogorov湍流时的光束扩展较大。在远场，光子晶体光栅的光束扩展与光源的空间相干度无关，这在长距离自由空间光通信中具有潜在的应用价值。
Based on extended Huygens–Fresnel principle, an analytical expression for beam width of partially coherent Hermite–Gaussian (PCHG) beam through non-Kolmogorov turbulence is derived. The effects of inner scale l0, outer scale L0, exponent value α, beam order m and degree of source spatial coherence on the spreading of PCHG beam through non-Kolmogorov turbulence are examined in detail. Results show that the smaller inner scale l0and bigger outer scale L0give rise to the bigger beam spreading of PCHG beam through non-Kolmogorov turbulence. In the far field, the beam spreading of PCHG is independent of the degree of source spatial coherence, which has potential applications in long-distance free-space optical communications.