Characteristics Of The RAiGV Beams Propagating In Anisotropic Non-Kolmogorov Atmospheric Turbulence

In recent years,the introduction and implementation of new type beams such as non-diffraction airy beams,vortex beams and vector beams provide a new direction for scholars to study how to reduce the transmission effect of beams propagating in atmospheric turbulence.Airy beams have the properties of non-diffraction,self-healing and transverse self-accelerating,so they have the better capability of anti-interference;the anti-interference capability of vortex beams in atmospheric turbulence is also stronger than that of any other beams,as the information carrier,the orbital angular momentum can realize the encoding and transmission of information,it is stable during the propagation;the polarization encoding of the vector beams themselves are not susceptible to the influence of atmospheric turbulence during the propagation.The new type beams such as the ring Airy Gaussian vortex(RAiGV)beams have the characteristics of both airy beams and vortex beams,and the vector beams generated by overlapping the RAiGV beams also have the characteristics of vector beams.In this dissertation,the propagation properties of the RAiVG beams and the vector beams in anisotropic non-Kolmogorov atmospheric turbulence are discussed.Combining non-uniform sampling and power spectrum method to generate generalized exponential spectrum for the scale-dependent anisotropic non-Kolmogorov turbulence phase screens,to simulate and research the optical transmission effect in the atmospheric turbulence based on multiple phase screens method,and then carry out the optical experiments with spatial light modulators.Numerical simulation and optical experiments both prove that the drifts of RAiGV beams are affected by the outer scale,anisotropy coefficient,power law of power spectrum of the turbulence,the topological charge,exponential truncation factor,radius of the primary ring of the beams.The larger the outer scale of turbulence is,as well as the smaller the anisotropy coefficient of turbulence is,the more serious influence the random fluctuations of the atmospheric turbulence will have on the RAiGV beams,and the different power law has the different influence on the drifts of the RAiGV beams,it is found that the maximum of the drifts is near the value of the power law which is equal to 3.3,that is,the atmospheric turbulence with the power law of 3.3 has the most serious influence on the RAiGV beams;the RAiGV beams who have the larger topological charge will be more stable,and have the better capability of resisting interference when propagating in the atmospheric turbulence,and the larger the exponential truncation factor and the radius of the primary ring is,the larger the drift is;at the same time,the drifts of the RAiGV beams increase with the increase of the propagation distance.By comparing and analyzing the interference patterns before and after RAiGV beams propagating in turbulence,it is found that the smaller the topological charge is,the better it keeps.Moreover,it is also found that the drifts of vector beams are smaller than the drifts of RAiGV beams,and vector beams have better capability of anti-interference.