| Comparison between relay propagation and direct propagation of Gaussian-Schell-model beam in turbulent atmosphere along a slant path |
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| 作者姓名： | 储修祥 刘泽金 吴毅 |
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| 作者单位： | School of Sciences, Zhejiang Forestry University, Lin'an 311300, China;College of Optoelectronic Science and Engineering, National University of Defence Technology, Changsha 410073, China; Anhui Institute of Optics and Fine Mechanics, the Chinese Academy of Sciences, Hefei 230031, China;College of Optoelectronic Science and Engineering, National University of Defence Technology, Changsha 410073, China;Anhui Institute of Optics and Fine Mechanics, the Chinese Academy of Sciences, Hefei 230031, China |
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| 摘 要： | The relay propagation of Gaussian-Schell-model in turbulent atmosphere along a slant path is studied in this paper. Based on the extended Huygens-Fresnel principle and a quadratic approximation, an analytical formula of average intensity for Gaussian-Schell-model beams in turbulent atmosphere along a slant path is derived, and some special cases are discussed. From the study and the comparison with the direct propagation, we can see that the relay propagation has an advantage over the direct propagation. When the altitude of the target is low, the peak intensity of relay propagation is much larger than that of direct propagation. However, because of the limitation of the relay system aperture for relay propagation and the variation of coherence length for direct propagation, the difference in peak intensity between the two propagations decreases with the increase of the target altitude.
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| 关 键 词： | relay propagation Gaussian-Schell-model beam turbulence |
| 收稿时间： | 2009-06-27 |
Comparison between relay propagation and direct propagation of Gaussian—Schell-model beam in turbulent atmosphere along a slant path |
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| Chu Xiu-Xiang,Liu Ze-Jin and Wu Yi.Comparison between relay propagation and direct propagation of Gaussian-Schell-model beam in turbulent atmosphere along a slant path[J].Chinese Physics B,2010,19(9):94201-094201. |
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| Authors: | Chu Xiu-Xiang Liu Ze-Jin and Wu Yi |
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| Institution: | [1]School of Sciences, Zhejiang Forestry University, Lin＇an 311300, China [2]College of Optoelectronic Science and Engineering, National University of Defence Technology, Changsha 410073, China [3]Anhui Institute of Optics and Fine Mechanics, the Chinese Academy of Sciences, Hefei 230031, China |
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| Abstract: | The relay propagation of Gaussian--Schell-model in turbulent atmosphere along a slant path is studied in this paper. Based on the extended Huygens--Fresnel principle and a quadratic approximation, an analytical formula of average intensity for Gaussian--Schell-model beams in turbulent atmosphere along a slant path is derived, and some special cases are discussed. From the study and the comparison with the direct propagation, we can see that the relay propagation has an advantage over the direct propagation. When the altitude of the target is low, the peak intensity of relay propagation is much larger than that of direct propagation. However, because of the limitation of the relay system aperture for relay propagation and the variation of coherence length for direct propagation, the difference in peak intensity between the two propagations decreases with the increase of the target altitude. |
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| Keywords: | relay propagation Gaussian--Schell-model beam turbulence |
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