Gaussian Beam Circular Aperture Diffraction Theory In The Collimation System Optimization Design Of Applied Research

The numerical aperture and focus in collimating system of wireless optical communication are parameters which should be a priority to make certain in collimating system. Optimize design of the numerical aperture and focus in the system will be detailed in this paper.Mainly subjects studied in it:1). The relation between numerical aperture and the passing power rate of semiconductor laser in collimating system has been studied through the parameter equations of fundamental mode Gaussian beam.2). We have studied the theory of Gaussian beam diffracted by a circular aperture on the basis of Richard .Schell's theory, modified the prescribe of the sign standard in accordance with the actual prescribe as well. Furthermore, the scope of the theory have been worked broadly, coming to an analytical expression of optical field and intensity distribution when the waist of Gaussian beam be located in the plane of circular aperture or front /back of circular aperture.3). We have studied the relationship between numerical aperture of collimating system and far-field intensity distribution in the transverse direction by the theory of Gaussian beam diffracted by a circular aperture.4). Discussion about the optimized design of the numerical aperture and focus of collimating system was followed by above studied.5). Besides, there are still two more interesting subjects studied in the paper: Compared far-field intensity distribution in the transverse direction of plane wave passing through a circular aperture with Gaussian beam; Degree of similarity between far-field intensity distribution in the transverse direction of Gaussian beam diffracted by a circular aperture and a standard Gaussian distribution.