Study on the approximative formula for the far-field of a Gaussian beam under circular aperture diffraction and its divergence  

作　　者：刘宏展 粱瑞生 黄旭光 

机构地区：[1]Laboratory of Photonic Information Technology South China Normal University

出　　处：《Chinese Optics Letters》2007年第1期4-7,共4页中国光学快报（英文版）

基　　金：This work was supported by the National "973" Program of China under Grant No. 2007CB307000 and 2007CB307001.

摘　　要：The approximative formula for the far-field diffraction of a Gaussian beam through a circular aperture is obtained by using the superposition of Gaussian beams instead of the aperture function, and the explicit expression for calculating the beam divergence is also gained. Using the formula, the influences of the aberrations on the far-field wavefront and the beam＇s divergence are researched, and the results show that the large aberrations badly affect the far-field wavefront and the divergence. It is suggested that the aberrations and the diffractions should be avoided when designing the transmitter.The approximative formula for the far-field diffraction of a Gaussian beam through a circular aperture is obtained by using the superposition of Gaussian beams instead of the aperture function, and the explicit expression for calculating the beam divergence is also gained. Using the formula, the influences of the aberrations on the far-field wavefront and the beam＇s divergence are researched, and the results show that the large aberrations badly affect the far-field wavefront and the divergence. It is suggested that the aberrations and the diffractions should be avoided when designing the transmitter.

关 键 词：ABERRATIONS Calculations Electromagnetic wave diffraction Transmitters WAVEFRONTS 

分 类 号：TN248.4[电子电信—物理电子学]