6190

6190

مدل سازي اثرات آشوبي جو بر انتشار پرتو ليزر

كارشناسي ارشد

فيزيك اتمي و مولكولي

دكتر محمد حسين مهديه

Abstract Laser beam propagation through turbulent atmosphere has been studied extensively for many years because of its importance in low-power beam transmission in to the atmosphere .When a low-power laser beam propagates through the atmosphere , it has been affected by several phenomena named " absorption " , " scattering " , " turbulent effects ", ... which " turbulent effects " are considered extremely because of their extensive usage in recent technologies such as optical telecommunication. In this thesis , we evaluate the propagation of a Gaussian laser beam in turbulent atmosphere numerically . Various types of turbulent conditions are considered as different values of " turbulent parameter ( n C ) " . The "quality factor" of the beam has studied under different atmospheric conditions as an important factor in recent optical technologies like Free Space Optics (FSO) . We have also consider different values of beam diameter and wavelength to optimize the quality factor of the beam . The results show that the beam quality can be affected dramatically by atmospheric turbulence and would decrees with the increase of turbulent effects.