The Propagation of Beam Array Through Atmospheric Turbulence in a Slanted Path
|School||Beijing University of Posts and Telecommunications|
|Keywords||atmospheric laser communication one-dimensional beamarray atmospheric turbulence propagation property|
Taking the Gaussian Schell-model (GSM) beams as a typical example of incoherent beams, a one-dimensional beam array consists of off-axis Gaussian-Schell model (GSM) beams is studied in this paper. Based on the extended Huygens-Fresnel principle, the analytical expressions for the average intensity, the mean-squared beam width and the far-field angular spread of the GSM beam array propagating through atmospheric turbulence in a slanted path are derived. Results show that the beam width broadening can be improved by choosing a proper optical wavelength, initial waist width and correlation length of the source. With the increasing number of the individual beams which compose the array, the far-field angular spread will increase. The conclusion is exact the opposite when the in free space atmosphere.The paper first summarizes the research background and development process of the atmospheric laser communication, then introduces the technical characteristics and application area of the atmospheric laser communication. On that basis the next chapter previews the possible trend in this area. Its key technologies are discussed and some solutions are put forward through software simulation. After that, the paper examines how the parameter of the source can affect the beam quality and discuss the method to improve the beam quality. Finally, the paper summarizes the main research work, and puts forward the improvement intention.