Experimental study on the laser beam wander characteristics of fold path propagation under deep turbulence condition

Xinmiao Li; Haiping Mei; Junxin Zhang; Yanling Li; Hanling Deng; Zhiwei Tao

doi:10.3788/IRLA20230719

Infrared and Laser Engineering, Volume. 53, Issue 5, 20230719(2024)

Experimental study on the laser beam wander characteristics of fold path propagation under deep turbulence condition

Xinmiao Li1...2,3, Haiping Mei1,3, Junxin Zhang1,2,3, Yanling Li1,2,3, Hanling Deng1,2,3, and Zhiwei Tao13 |Show fewer author(s)

Author Affiliations

¹Key Laboratory of Atmospheric Optics, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China

²Science Island Branch, Graduate School of University of Science and Technology of China, Hefei 230026, China

³Advanced Laser Technology Laboratory of Anhui Province, Hefei 230037, China

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Figures & Tables(8)

Fig. 1. Schematic diagram of the laser imaging detection experimental system

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Fig. 2. The atmospheric coherence length and the standard deviation of the drift angle changes with time. (a) L=1 km；(b) L=7 km

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Fig. 3. The standard deviation of the drift angle changes with r₀. (a) L=1 km；(b) L=7 km

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$The distribution of spot centroid, the first row is the distribution of 1 km spot centroid, the second row is the distribution of 7 km spot centroid. (a) Time is 11:00, \begin{document}${r_0} \approx 0.987 $\end{document} cm ; (b) Time is 17:40, \begin{document}${r_0} \approx 6.866 $\end{document} cm; (c) Time is 23:00, \begin{document}${r_0} \approx 2.333 $\end{document} cm; (d) Time is 11:00, \begin{document}${r_0} \approx 0.724 $\end{document} cm; (e) Time is 17:40, \begin{document}${r_0} \approx 3.333 $\end{document} cm; (f) Time is 23:00, \begin{document}${r_0} \approx 1.760 $\end{document} cm$

Fig. 4. The distribution of spot centroid, the first row is the distribution of 1 km spot centroid, the second row is the distribution of 7 km spot centroid. (a) Time is 11:00, $Unknown environment 'document'$ cm ; (b) Time is 17:40, $Unknown environment 'document'$ cm; (c) Time is 23:00, $Unknown environment 'document'$ cm; (d) Time is 11:00, $Unknown environment 'document'$ cm; (e) Time is 17:40, $Unknown environment 'document'$ cm; (f) Time is 23:00, $Unknown environment 'document'$ cm

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Fig. 5. Anisotropic factor R changes with time. (a) L=1 km；(b) L=7 km

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Fig. 6. Anisotropic factor R changes with r₀. (a) L=1 km; (b) L=7 km

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Table 1. Main parameters of laser imaging detection experimental system

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Table 1. Main parameters of laser imaging detection experimental system

Component	Parameter	Value
Laser source	Wavelength/nm	532
	Energy stability	0.083%
	Spot diameter (1/e²) /mm	1.100
	Divergence angle/mrad	<1
Telescope1	Aperture diameter/m	0.35
Telescope1	Focus length/m	2.84
Telescope2	Aperture diameter/m	0.35
Telescope2	Focus length/m	3.55
CCD1	Frame frequency/frame·s⁻¹	150
	Resolution/pixel	1440×1080
	Depth of color/bit	8
CCD2	Exposure range/μs	32-2000
CCD2	Resolution/pixel	1936×1096
Expander	Magnification	20

Table 2. The relative deviation of the theoretical value of the standard deviation of the drift angle from the measured value

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Table 2. The relative deviation of the theoretical value of the standard deviation of the drift angle from the measured value

	Turbulent state	Kolmogorov	Von Karman	Exponential	Rytov
1 km	Weak	27.10%	27.35%	26.84%	40.93%
	Moderate	16.96%	16.71%	16.36%	33.79%
	Strong	23.72%	12.21%	21.46%	41.32%
	All	21.73%	18.20%	20.71%	38.70%
7 km	Strong	23.43%	22.08%	23.31%	21.09%

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Xinmiao Li, Haiping Mei, Junxin Zhang, Yanling Li, Hanling Deng, Zhiwei Tao. Experimental study on the laser beam wander characteristics of fold path propagation under deep turbulence condition[J]. Infrared and Laser Engineering, 2024, 53(5): 20230719

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