scholarly journals Wave Structure Function and Long-Exposure MTF for Gaussian-Beam Waves Propagating in Anisotropic Maritime Atmospheric Turbulence

2020 ◽  
Vol 10 (16) ◽  
pp. 5484
Author(s):  
Bing Guan ◽  
Haiyang Yu ◽  
Wei Song ◽  
Jaeho Choi
Keyword(s):  
Structure Function ◽  
Gaussian Beam ◽  
Atmospheric Turbulence ◽  
Isotropic Turbulence ◽  
Imaging System ◽  
Wave Structure ◽  
Modulation Transfer ◽  
Horizontal Path ◽  
Kolmogorov Turbulence ◽  
Waves Propagation

The expressions of wave structure function (WSF) and long-exposure modulation transfer function (MTF) for laser beam propagation through non-Kolmogorov turbulence were derived in our previous work. In this paper, based on anisotropic maritime atmospheric non-Kolmogorov spectrum, the new analytic expression of WSF for Gaussian-beam waves propagation through turbulent atmosphere in a horizontal path is derived. Moreover, using this newly derived expression, long-exposure MTF for Gaussian-beam waves is obtained for analyzing the degrading effects in an imaging system. Using the new expressions, WSF and MTF for Gaussian-beam waves propagating in terrestrial and maritime atmospheric turbulence are evaluated. The simulation results show that Gaussian-beam waves propagation through maritime turbulence obtain more degrading effects than terrestrial turbulence due to the humidity and temperature fluctuations. Additionally, the degrading effects under anisotropic turbulence get less loss than that of isotropic turbulence.

scholarly journals Modulation Transfer Function of a Gaussian Beam Based on the Generalized Modified Atmospheric Spectrum

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Chao Gao ◽  
Xiaofeng Li
Keyword(s):  
Transfer Function ◽  
Gaussian Beam ◽  
Atmospheric Turbulence ◽  
Modulation Transfer Function ◽  
Spectral Power ◽  
Optical Parameters ◽  
Modulation Transfer ◽  
Negative Effects ◽  
Kolmogorov Turbulence ◽  
Inner Scale

This paper investigates the modulation transfer function of a Gaussian beam propagating through a horizontal path in weak-fluctuation non-Kolmogorov turbulence. Mathematical expressions are obtained based on the generalized modified atmospheric spectrum, which includes the spectral power law value of non-Kolmogorov turbulence, the finite inner and outer scales of turbulence, and other optical parameters of the Gaussian beam. The numerical results indicate that the atmospheric turbulence would produce less negative effects on the wireless optical communication system with an increase in the inner scale of turbulence. Additionally, the increased outer scale of turbulence makes a Gaussian beam influenced more seriously by the atmospheric turbulence.

Interferential seeing monitor, a seeing monitor for atmospheric turbulence studies: calibration with the differential image motion monitor

2020 ◽  
Vol 500 (2) ◽  
pp. 1884-1888
Author(s):  
Mohammed Sabil ◽  
A Habib ◽  
Z Benkhaldoun
Keyword(s):  
Structure Function ◽  
Atmospheric Turbulence ◽  
Wave Structure ◽  
Image Motion ◽  
Phase Fluctuations ◽  
Amplitude Fluctuations ◽  
Focus Plane ◽  
Cross Calibration ◽  
Double Slit ◽  
Good Agreement

ABSTRACT In this work, we aim to calibrate an interferential seeing monitor (ISM), which is a testing instument used at astronomical sites. Its method is based on the study of the diffraction pattern produced by a Young’s double-slit at the focus plane of a telescope. This method allows us to obtain the wave structure function by taking into account both phase and amplitude fluctuations of the light wavefront. A phase seeing εϕ was assigned to phase fluctuations and an amplitude seeing εχ was assigned to amplitude fluctuations (scintillation phenomenon), which allows us to obtain both phase and amplitude fluctuations. The feasibility of the ISM method was demonstrated by numerical simulations presented in a previous work. In this work, we have conducted a cross-calibration campaign of the ISM with a differential image motion monitor (DIMM) over 16 nights at the Oukaimeden and Atlas Golf Marrakech Observatories. The goal of this campaign was to study the reliability of this new method. In this paper, we present the calibration measurements and a comparison between the seeing measured by the ISM (εϕ, εχ) and that obtained by the DIMM (εdimm). These results show good agreement between the phase- eeing εϕ and εdimm.

Influence of moderate-to-strong non-Kolmogorov turbulence on the imaging system by atmospheric turbulence MTF

Optik ◽  
2015 ◽  
Vol 126 (2) ◽  
pp. 191-198 ◽  
Author(s):  
Linyan Cui ◽  
Bindang Xue ◽  
Xiaoguang Cao ◽  
Fugen Zhou
Keyword(s):  
Atmospheric Turbulence ◽  
Imaging System ◽  
Kolmogorov Turbulence

Bumps of the wave structure function in non-Kolmogorov turbulence

2015 ◽  
Author(s):  
Chunhong Qiao ◽  
Lu Lu ◽  
Pengfei Zhang ◽  
Haitao Wang ◽  
Honghua Huang ◽  
...  
Keyword(s):  
Structure Function ◽  
Wave Structure ◽  
Kolmogorov Turbulence

Propagation and self-healing properties of Lommel-Gaussian beam through atmospheric turbulence

2021 ◽  
Vol 17 (9) ◽  
pp. 572-576
Author(s):  
Xiang Chen ◽  
Yabo Yuan ◽  
Baoluo Yan ◽  
Ruoyu Zhang ◽  
Haifeng Liu ◽  
...  
Keyword(s):  
Gaussian Beam ◽  
Atmospheric Turbulence ◽  
Self Healing
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