Investigation and Simulation of the Cn2 Parameter and its Effects on the Average Intensity Distribution, Spot Size, Radius of Curvature, and Rayleigh Length of the Laser Beam Propagation in the Atmosphere

Document Type : -

Authors

1 Department of Photonics/Faculty of Basic Science/ Imam Hussein Comprehensive University/ Tehran/Iran

2 Department of Photonics/ Faculty and Research Institute of Basic Science,/Imam Hossein Comprehensive University,/Tehran/ Iran

Abstract

One of the significant problems of laser propagation in the atmosphere is the atmospheric turbulence and fluctuations of refractive index, which affects the laser parameters. In this article, the effects of atmospheric refractive index structure parameter (Cn2) on the intensity distribution, spot size, radius of curvature, and Rayleigh length of the laser beam propagated with Gaussian profile, wavelength 1064 nm, size of beam waist 1 cm and power 1 W have been investigated. In order to predict Cn2 parameter values, Hufnagel-Valley (HV) and Hufnagel-Andrews-Phillips (HAP) models were compared. The simulation results show that in both models, the Cn2 parameter decreases with the increase in height. Also, although the HV model is suitable for determining the Cn2 parameter at high altitudes with the presence of wind, it does not determine the behavior of the Cn2 parameter as well as the experimental results and the HAP model at low altitudes and at different hours of the day. The simulation of laser propagation in the atmosphere shows that with the increase of the Cn2 parameter, the average intensity distribution decreases and the spot size increases; Also, the radius of curvature is reduced and the Rayleigh length first goes up and then goes down. Despite the problems of laser propagation in the atmosphere, the results of this article and future investigations seem necessary to reduce and compensate for these effects.

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References

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Journal of Advanced Defense Science & Technology
Volume 14, Issue 2 - Serial Number 52
September 2024
Pages 79-87

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History

  • Receive Date: 04 April 2023
  • Revise Date: 30 July 2023
  • Accept Date: 11 August 2023

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