Propagation analysis of flattened circular Gaussian beams with a circular aperture in turbulent atmosphere
Propagation analysis of flattened circular Gaussian beams with a circular aperture in turbulent atmosphere
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DOI：
10.1016/j.optcom.2007.02.035
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发表时间：
2007-06
影响因子：
2.4
通讯作者：
X. Chu;Y. Ni;Guoquan Zhou
中科院分区：
文献类型：
--
作者：
X. Chu;Y. Ni;Guoquan Zhou
利用推广的惠更斯-菲涅耳原理研究了有光阑平顶高斯光束在湍流大气中的传输特性。通过研究和数值计算，阐明了光阑对平顶高斯光束在湍流大气中传输的影响。结果表明，当截断参数δ较大时，如δ ≥ 2，孔径对传输特性的影响很小，不能忽略。但当截断参数δ较小时，如δ<2，孔径效应较为复杂。随着传输距离的增加，有光阑时平均光强峰值下降的速度比无光阑时快，光斑扩展的速度比无光阑时快。同时，随着传输距离的增加，平顶高斯光束的平均光强分布逐渐转变为高斯平均光强分布。此外，还讨论了一些极限情况。它与现有的结果一致。
The propagation properties of flattened Gaussian beam with aperture in turbulent atmosphere have been studied by using the extended Huygens–Fresnel principle. From the study and numerical calculation, the effects of aperture on the propagation of flattened Gaussian beams in turbulent atmosphere have been illuminated. It shows that when the value of the truncation parameter δ is bigger, for example δ⩾2, the effects of aperture on the propagation properties are too small to be neglected. But when the truncation parameter δ is smaller, for example δ<2, the effects of aperture are complex. The peak value of the average intensity descends more rapidly and the beam spot spreads quicker with aperture than that without aperture when the propagation distance increases. Meanwhile, with the propagation distance increasing, the average intensity profiles of flattened Gaussian beams gradually convert into Gaussian average intensity profiles. In addition, some limiting cases are also discussed. It agrees with the existing results.