| The occurrence of diffraction phenomena during laser transmission in space can cause energy attenuation and beam quality deterioration,which can seriously affect communication performance.Diffraction-free beam,as a new emerging beam,has the characteristics of small central spot diameter and long propagation distance.Typical representatives are Bessel beam,Laguerre-Gauss beam,pin-like optical beam and Airy beam,etc.The non-diffractive,self-healing and self-accelerating nature of the Airy beam has attracted a lot of attention from researchers.It was found that the diffraction rate of Airy beams is slower and the distance of diffraction-free transmission is longer than that of Gaussian beams with the same parameters.Based on this,this paper focuses on the Airy beam and its array form in the new beam.The details are as follows.1.Based on the basic theory of Airy beam in transmission trajectory regulation,the regulation of Airy beam transmission trajectory is simulated by shifting the phase diagram in frequency domain and controlling the initial emission angle of Airy beam.In laser communication,the control of the beam transmission trajectory allows it to bypass obstacles and reduce the loss of energy.2.Combined with the basic theory of Airy beam intensity regulation and beam array,the intensity regulation of Airy beam array is studied,and the basic formula for the intensity regulation of Airy beam array is given,and the simulation study is carried out.It was found that the intensity of the Airy beam array focal point was enhanced from 0.85 to 1.1 at the transmission distance of 190 mm by intensity modulation,and the enhancement of the beam intensity at the target point was achieved.3.Combining the basic principles of atmospheric turbulence,the beam state of Airy beam after passing through turbulence of different intensities is simulated.The intensity of the Airy beam and the intensity of the array after passing through atmospheric turbulence was regulated by combining the intensity regulation principle.The simulation found that the Airy beam intensity was enhanced from 0.027 to 0.031 in the weak turbulence case,and the beam intensity of the Airy beam array was enhanced from 0.85 to 1.03 in the medium turbulence case.The beam intensity enhancement is achieved in atmospheric turbulence,which is of research significance for improving turbulence suppression in atmospheric transmission of laser communications.4.Combined with the basic principle of Airy beam scintillation factor,the simulation of the scintillation factor of Airy beam at different beam widths and different attenuation was carried out.The results show that different beam widths have different effects on the scintillation factor;with the increase of the attenuation factor,the scintillation factor of Airy beam increases subsequently.In laser communication,the selection of appropriate beam parameters and reduction of beam scintillation are beneficial for improving the quality of laser communication and the implementation of communication optical links. |
