Fluctuation characteristics of laser transmissions in atmospheric turbulence

Yang, Xiaodong; Gao, Ming

doi:10.1016/j.ijleo.2019.163624

Cited by 7 publications

(3 citation statements)

References 16 publications

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“…For the modified Von Karman and Kolmogorov turbulent power spectrum, on the path from z = 0 to z = L, the axial scintillation index of spherical waves under the weak fluctuation condition are expressed as in Eqs 18-19, respectively [23]:…”

Section: Measurement Results and Analysismentioning

confidence: 99%

A lidar for detecting atmospheric turbulence based on modified Von Karman turbulence power spectrum

Zhou,

Mao

2024

Front. Phys.

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Introduction: Atmospheric turbulence is a kind of random vortex motion. A series of turbulent effects, such as fluctuation of light intensity, occur when laser is transmitted in atmospheric turbulence.Methods: In order to verify the possibility of detecting atmospheric turbulence by the Mie-scattering lidar, firstly, based on the power spectrum method, the Zernike polynomial method is used to simulate generation of the modified Von Karman turbulent phase screen by low-frequency compensation. By comparing the obtained phase structure function with the theoretical value, the accuracy of the method is verified. Moreover, the transmission process of the Gaussian beam from Mie-scattering lidar through the phase screen is simulated, and the transmission characteristics of the beam under modified Von Karman turbulence are obtained by analyzing the fluctuation of light intensity. Secondly, based on the guidance for simulation analysis, a Miescattering lidar system for detecting the intensity of atmospheric turbulence was developed in Yinchuan area, and the atmospheric turbulence profile was inverted by detected scintillation index.Results: The results show it is feasible to use the Zernike polynomial method perform the low-frequency compensation, and the compensation effect of low order is better than that of high order compensation. The scintillation index of simulation is consistent with the actual detection result, and has the very high accuracy, indicating that the atmospheric turbulence detection using Mie-scattering lidar is effective.Conclusion: These simulations and experiments play a significant guiding role for the similar lidar to detect atmospheric turbulence.

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Section: Measurement Results and Analysismentioning

confidence: 99%

A lidar for detecting atmospheric turbulence based on modified Von Karman turbulence power spectrum

Zhou,

Mao

2024

Front. Phys.

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“…Atmospheric turbulent motion will cause random fluctuations in the atmospheric refractive index, and atmospheric molecules and aerosols will absorb and scatter light wave energy. These reasons will cause atmospheric turbulence effects, thermal halo effects, and attenuation effects when lasers are transmitted in the atmosphere [7,8] . The power density of the laser transmitted to the target decreases, which seriously restricts the application performance of advanced laser systems.…”

Section: Introductionmentioning

confidence: 99%

Design and implementation of laser atmospheric transmission digital twin software system

Zhang,

Qian,

Zhu

et al. 2024

Fourth International Conference on Digital Signal and Computer Communications (DSCC 2024)

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Atmospheric turbulence causes refractive index fluctuations, and atmospheric molecules absorb and scatter light wave energy, causing the power density of the laser to reach the target to decrease, restricting the application performance of advanced optoelectronic systems. Precision optoelectronic equipment has problems such as long development cycles and difficulty in quality control. Digital twins have low cost to establish digital models, can be quickly iterated, and have great potential in system analysis and diagnosis. According to the laser atmospheric transmission physical model and performance evaluation requirements, the laser transmission model is constructed and integrated in the digital space, and the C++ language, Qt (Q Toolkit) platform and multi-threaded parallel processing technology is used to develop and test the software system. Provides practical software tools for laser transmission performance evaluation and system parameter optimization design. With the help of the software system, the functional relationship of the refractive index structure constant, wind speed, absorption coefficient and extinction coefficient profile with height changes as well as the energy intensity distribution of the target surface spot can be calculated and visualized.

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“…In the past years, the propagations of the light beams affected by a turbulent medium have been extensively studied due to their interesting applications (Andrews and Phillips 1998;Baykal 2005). These studies have been included several types of laser beams through various turbulence media such as Laguerre-Gaussian, flat-topped Gaussian, Hollow-Gaussian, Bessel-Laguerre-Gaussian and multi-Gaussian beams (Zhong et al 2011; addition, many studies of this domain are recently published (Hricha et al 2020;Li et al 2020;Khandelwal 2020;Yang and Gao 2020). On the same context, it found that the biological tissue having a turbulent medium properties similar to the atmosphere and the ocean (Gökçe and Baykal 2018).…”

Section: Introductionmentioning

confidence: 99%

Effect of the turbulent biological tissues on the propagation properties of Coherent Laguerre-Gaussian beams

Ebrahim

Belafhal

2021

Opt Quant Electron

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In this paper, the effects of turbulent biological tissues (TBT) on the propagation properties of the coherent Laguerre-Gaussian (CLG) beams are studied. Based on the turbulence theory and using the power spectrum refractive-index model, the expression formulae of the average irradiance intensity and spreading properties of a CLG beam propagating in TBT are derived. The influence of propagation distance, beam orders, wavelengths and tissue turbulence parameters are then investigated numerically. It found that, the central dark zone of the circular/elliptical LG beams rises more rapidly as the propagation distance and the structural constant of the refractive index of the biological tissue increase and the beams become eventually more like Gaussian beams in the far-field under the influence of the turbulence biological tissues. Also, the numerical results proved that the effective beam spot radius increases as turbulence, wavelength, and propagation distance are increasing.Ultimately, the beams become circular under the influence of the turbulence of the biological tissue.As found that the effective beam spot radius along the x-axis becomes equal to that of the y-axis in high TBT which explain why an elliptical LG beam is converted into a circular one in higher structural constant of the turbulent tissue. Moreover, our results show that, the influence of the beam order m slightly greater than that of l on the beam spreading.

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Fluctuation characteristics of laser transmissions in atmospheric turbulence

Cited by 7 publications

References 16 publications

A lidar for detecting atmospheric turbulence based on modified Von Karman turbulence power spectrum

A lidar for detecting atmospheric turbulence based on modified Von Karman turbulence power spectrum

Design and implementation of laser atmospheric transmission digital twin software system

Effect of the turbulent biological tissues on the propagation properties of Coherent Laguerre-Gaussian beams

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