| In the laser propagation process in atmosphere,the quality of beam will be destroyed due to the distortion of beam surface caused by the atmospheric turbulence,and it is an important factor limiting the application of laser beam in optoelectronic engineering.Owning to this reason,he quantitative evaluation of the influence of the atmospheric turbulence on laser propagation properties has become an important research content.Restricted by turbulence observation technology and theory,the former researches of turbulence's effect on laser propagation is based on the assumption that the turbulence is isotropic,while ignoring the actual heterogeneity and anisotropy of atmospheric turbulence,which is not in accordance with the fact.To this end,the influence of non-Kolmogorov turbulence on laser propagation is studied in this paper.In our work,the non-Kolmogorov turbulence is constructed with equivalent structure constant model;based on the multi-phase screens technology,the calculation method of the laser transmission in the non-uniform turbulent flow of the path is given and the beam quality assessment software was further designed.The propagation characteristics of Gaussian beam,Laguere-gaussian beam and Airy beam in non-Kolmogorov and Kolmogorov turbulence were simulated by the self-developed software,and the influence of the path non-uniformity of the power spectrum power-law and transmission distance on the light scintillation,the beam broadening and the beam drift is systematically discussed.The results show that the discrepancy of laser transmission simulation results in non-Kolmogorov turbulence and Kolmogorov turbulence decreases with the increase of transmission distance.It is necessary to take the influence of the anisotropy of turbulence into consideration when the transmission distance is not very large.This work can provide a reference for the beam quality assessment before the design of laser application system. |
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