| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Numerical simulation of super-continuum laser propagation in turbulent atmosphere |
| Ya-Qian Li(李雅倩)1,2,3, Wen-Yue Zhu (朱文越)1,3, and Xian-Mei Qian(钱仙妹)1,3,† |
| 1 Key Laboratory of Atmospheric Optics, Anhui Institute of Optics and Fine Mechanics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China; 2 Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, China; 3 Advanced Laser Technology Laboratory of Anhui Province, Hefei 230037, China |
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Abstract Considering the atmospheric extinction and turbulence effects, we investigate the propagation performances of super-continuum laser sources in atmospheric turbulence statistically by using the numerical simulation method, and the differences in propagation properties between the super-continuum (SC) laser and its pump laser are also analyzed. It is found that the propagation characteristics of super-continuum laser are almost similar to those of the pump laser. The degradation of source coherence degree may cause the relative beam spreading and scintillation indexes to decrease at different propagation distances or different turbulence strengths. The root-mean-square value of beam wandering is insensitive to the variation of source correlation length, and less aperture averaging occurs when the laser source becomes less coherent. Additionally, from the point of view of beam wandering, the SC laser has no advantage over the pump laser. Although the pump laser can bring about a bigger aperture average, the SC laser has a lower scintillation which may be due to the multiple wavelength homogenization effects on intensity fluctuations. This would be the most important virtue of the SC laser that can be utilized to improve the performance of laser engineering.
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Received: 30 August 2020
Revised: 19 October 2020
Accepted manuscript online: 15 December 2020
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PACS:
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42.25.Bs
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(Wave propagation, transmission and absorption)
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42.68.Bz
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(Atmospheric turbulence effects)
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| Fund: Project supported by the Director Fund of Advanced Laser Technology Laboratory of Anhui Province, China (Grant No. 20191002). |
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Corresponding Authors:
†Corresponding author. E-mail: qianxianmei@aiofm.ac.cn
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Cite this article:
Ya-Qian Li(李雅倩), Wen-Yue Zhu (朱文越), and Xian-Mei Qian(钱仙妹) Numerical simulation of super-continuum laser propagation in turbulent atmosphere 2021 Chin. Phys. B 30 034201
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